Empathy List Archives

B

ben

Sun, Aug 31, 2014 12:37 PM

Hello all,
Just a heads up. I noted there is a lonely Datron / Wavetek 4920M AC
voltmeter for sale on ebay, starting at US$650 (ending in 1 day !). I have
little idea of its true working state or not (picture shows it powered on).
If fully working it would be a good buy for an AC voltmeter that is, I
reckon, better than an HP 3458A. Only drawback with these models is the
voltage input shell is always earthed, not floating. I have two of these
4920M's already, not really tempted by a third. I have a paper copies of
operator, calibration, and service manual if anyone interested.

regards, ben.

Hello all, Just a heads up. I noted there is a lonely Datron / Wavetek 4920M AC voltmeter for sale on ebay, starting at US$650 (ending in 1 day !). I have little idea of its true working state or not (picture shows it powered on). If fully working it would be a good buy for an AC voltmeter that is, I reckon, better than an HP 3458A. Only drawback with these models is the voltage input shell is always earthed, not floating. I have two of these 4920M's already, not really tempted by a third. I have a paper copies of operator, calibration, and service manual if anyone interested. regards, ben.

CB

Charles Black

Sun, Aug 31, 2014 5:19 PM

Hi Ben,

I am going to check this out today to find if it might be helpfull
around here for my AC calibration. It has an error message: "Error Ur"
so some fixing is going to be needed. On the back it says it's got
Option 80, whatever that is.

Charlie

On 8/31/2014 5:37 AM, ben wrote:

Hello all,
Just a heads up. I noted there is a lonely Datron / Wavetek 4920M AC
voltmeter for sale on ebay, starting at US$650 (ending in 1 day !). I have
little idea of its true working state or not (picture shows it powered on).
If fully working it would be a good buy for an AC voltmeter that is, I
reckon, better than an HP 3458A. Only drawback with these models is the
voltage input shell is always earthed, not floating. I have two of these
4920M's already, not really tempted by a third. I have a paper copies of
operator, calibration, and service manual if anyone interested.

regards, ben.

volt-nuts mailing list -- volt-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
and follow the instructions there.

Hi Ben, I am going to check this out today to find if it might be helpfull around here for my AC calibration. It has an error message: "Error Ur" so some fixing is going to be needed. On the back it says it's got Option 80, whatever that is. Charlie On 8/31/2014 5:37 AM, ben wrote: > Hello all, > Just a heads up. I noted there is a lonely Datron / Wavetek 4920M AC > voltmeter for sale on ebay, starting at US$650 (ending in 1 day !). I have > little idea of its true working state or not (picture shows it powered on). > If fully working it would be a good buy for an AC voltmeter that is, I > reckon, better than an HP 3458A. Only drawback with these models is the > voltage input shell is always earthed, not floating. I have two of these > 4920M's already, not really tempted by a third. I have a paper copies of > operator, calibration, and service manual if anyone interested. > > regards, ben. > _______________________________________________ > volt-nuts mailing list -- volt-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > and follow the instructions there. > > >

SG

Stephen Grady

Sun, Aug 31, 2014 8:06 PM

Charlie,

The "Error Ur" is an under-range error; you have to apply an input above 10% of the range before it will display a reading. The 4920's are a very nice instrument. Their only problem is that they are all so old that they are reaching the stage where some components are drifting excessively or failing. I have come across 4920's that are drifting a little (more than there spec) between cals (and yes they need to be cal'd annually), another 4920 I came across had an intermittent failure in one of its power supplies.

Kind Regards,

Stephen Grady
Sydney Australia

-----Original Message-----
From: volt-nuts [mailto:volt-nuts-bounces@febo.com] On Behalf Of Charles Black
Sent: Monday, 1 September 2014 3:19 AM
To: ben@veritechmeasurements.com.au; Discussion of precise voltage measurement
Subject: Re: [volt-nuts] Datron 4920M, AC Voltmeter, for sale on ebay - 1 day left

Hi Ben,

I am going to check this out today to find if it might be helpfull around here for my AC calibration. It has an error message: "Error Ur"
so some fixing is going to be needed. On the back it says it's got Option 80, whatever that is.

Charlie

On 8/31/2014 5:37 AM, ben wrote:

Hello all,
Just a heads up. I noted there is a lonely Datron / Wavetek 4920M AC
voltmeter for sale on ebay, starting at US$650 (ending in 1 day !). I
have little idea of its true working state or not (picture shows it powered on).
If fully working it would be a good buy for an AC voltmeter that is, I
reckon, better than an HP 3458A. Only drawback with these models is
the voltage input shell is always earthed, not floating. I have two of
these 4920M's already, not really tempted by a third. I have a paper
copies of operator, calibration, and service manual if anyone interested.

regards, ben.

volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
and follow the instructions there.

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Charlie, The "Error Ur" is an under-range error; you have to apply an input above 10% of the range before it will display a reading. The 4920's are a very nice instrument. Their only problem is that they are all so old that they are reaching the stage where some components are drifting excessively or failing. I have come across 4920's that are drifting a little (more than there spec) between cals (and yes they need to be cal'd annually), another 4920 I came across had an intermittent failure in one of its power supplies. Kind Regards, Stephen Grady Sydney Australia -----Original Message----- From: volt-nuts [mailto:volt-nuts-bounces@febo.com] On Behalf Of Charles Black Sent: Monday, 1 September 2014 3:19 AM To: ben@veritechmeasurements.com.au; Discussion of precise voltage measurement Subject: Re: [volt-nuts] Datron 4920M, AC Voltmeter, for sale on ebay - 1 day left Hi Ben, I am going to check this out today to find if it might be helpfull around here for my AC calibration. It has an error message: "Error Ur" so some fixing is going to be needed. On the back it says it's got Option 80, whatever that is. Charlie On 8/31/2014 5:37 AM, ben wrote: > Hello all, > Just a heads up. I noted there is a lonely Datron / Wavetek 4920M AC > voltmeter for sale on ebay, starting at US$650 (ending in 1 day !). I > have little idea of its true working state or not (picture shows it powered on). > If fully working it would be a good buy for an AC voltmeter that is, I > reckon, better than an HP 3458A. Only drawback with these models is > the voltage input shell is always earthed, not floating. I have two of > these 4920M's already, not really tempted by a third. I have a paper > copies of operator, calibration, and service manual if anyone interested. > > regards, ben. > _______________________________________________ > volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > and follow the instructions there. > > > _______________________________________________ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there. --- This email is free from viruses and malware because avast! Antivirus protection is active. http://www.avast.com

CB

Charles Black

Sun, Aug 31, 2014 9:41 PM

Hi Stephen,

Thanks for the info on the 4920M. It might be that I should pass on this
but it is nice to know that it is probably working. If I don't have the
necessary items needed for calibration it might still be a good source
uncalibrated.

I was hoping that the 4920 had better minimum voltage out steps than my
present Rigol 4062 for 3458a AC calibration. I have two EL 1400 0.25V
voltage thermal converters that I was trying to use in a test setup but
they had such a low voltage range that I was forced to use my ATV-60
attenuator. It all kind of worked but a 0.1 db minimum step is a little
course for easy use. The Rigol also suffers from this malady.

Charlie

On 8/31/2014 1:06 PM, Stephen Grady wrote:

Charlie,

The "Error Ur" is an under-range error; you have to apply an input above 10% of the range before it will display a reading. The 4920's are a very nice instrument. Their only problem is that they are all so old that they are reaching the stage where some components are drifting excessively or failing. I have come across 4920's that are drifting a little (more than there spec) between cals (and yes they need to be cal'd annually), another 4920 I came across had an intermittent failure in one of its power supplies.

Kind Regards,

Stephen Grady
Sydney Australia

-----Original Message-----
From: volt-nuts [mailto:volt-nuts-bounces@febo.com] On Behalf Of Charles Black
Sent: Monday, 1 September 2014 3:19 AM
To: ben@veritechmeasurements.com.au; Discussion of precise voltage measurement
Subject: Re: [volt-nuts] Datron 4920M, AC Voltmeter, for sale on ebay - 1 day left

Hi Ben,

I am going to check this out today to find if it might be helpfull around here for my AC calibration. It has an error message: "Error Ur"
so some fixing is going to be needed. On the back it says it's got Option 80, whatever that is.

Charlie

On 8/31/2014 5:37 AM, ben wrote:

Hello all,
Just a heads up. I noted there is a lonely Datron / Wavetek 4920M AC
voltmeter for sale on ebay, starting at US$650 (ending in 1 day !). I
have little idea of its true working state or not (picture shows it powered on).
If fully working it would be a good buy for an AC voltmeter that is, I
reckon, better than an HP 3458A. Only drawback with these models is
the voltage input shell is always earthed, not floating. I have two of
these 4920M's already, not really tempted by a third. I have a paper
copies of operator, calibration, and service manual if anyone interested.

regards, ben.

volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
and follow the instructions there.

volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
and follow the instructions there.

This email is free from viruses and malware because avast! Antivirus protection is active.
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volt-nuts mailing list -- volt-nuts@febo.com
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and follow the instructions there.

Hi Stephen, Thanks for the info on the 4920M. It might be that I should pass on this but it is nice to know that it is probably working. If I don't have the necessary items needed for calibration it might still be a good source uncalibrated. I was hoping that the 4920 had better minimum voltage out steps than my present Rigol 4062 for 3458a AC calibration. I have two EL 1400 0.25V voltage thermal converters that I was trying to use in a test setup but they had such a low voltage range that I was forced to use my ATV-60 attenuator. It all kind of worked but a 0.1 db minimum step is a little course for easy use. The Rigol also suffers from this malady. Charlie On 8/31/2014 1:06 PM, Stephen Grady wrote: > Charlie, > > > The "Error Ur" is an under-range error; you have to apply an input above 10% of the range before it will display a reading. The 4920's are a very nice instrument. Their only problem is that they are all so old that they are reaching the stage where some components are drifting excessively or failing. I have come across 4920's that are drifting a little (more than there spec) between cals (and yes they need to be cal'd annually), another 4920 I came across had an intermittent failure in one of its power supplies. > > Kind Regards, > > Stephen Grady > Sydney Australia > > -----Original Message----- > From: volt-nuts [mailto:volt-nuts-bounces@febo.com] On Behalf Of Charles Black > Sent: Monday, 1 September 2014 3:19 AM > To: ben@veritechmeasurements.com.au; Discussion of precise voltage measurement > Subject: Re: [volt-nuts] Datron 4920M, AC Voltmeter, for sale on ebay - 1 day left > > Hi Ben, > > I am going to check this out today to find if it might be helpfull around here for my AC calibration. It has an error message: "Error Ur" > so some fixing is going to be needed. On the back it says it's got Option 80, whatever that is. > > Charlie > > > On 8/31/2014 5:37 AM, ben wrote: >> Hello all, >> Just a heads up. I noted there is a lonely Datron / Wavetek 4920M AC >> voltmeter for sale on ebay, starting at US$650 (ending in 1 day !). I >> have little idea of its true working state or not (picture shows it powered on). >> If fully working it would be a good buy for an AC voltmeter that is, I >> reckon, better than an HP 3458A. Only drawback with these models is >> the voltage input shell is always earthed, not floating. I have two of >> these 4920M's already, not really tempted by a third. I have a paper >> copies of operator, calibration, and service manual if anyone interested. >> >> regards, ben. >> _______________________________________________ >> volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts >> and follow the instructions there. >> >> >> > > _______________________________________________ > volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > and follow the instructions there. > > > --- > This email is free from viruses and malware because avast! Antivirus protection is active. > http://www.avast.com > > _______________________________________________ > volt-nuts mailing list -- volt-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > and follow the instructions there. > > >

A

acbern@gmx.de

Mon, Sep 1, 2014 10:29 PM

charlie,

you can expand these tvcs by range resistors to work as higher voltage tvcs. if you do it right (rf-type setup) you can work up to a couple hundred khz with just minor additional error beyond its error in its orgininal voltage range. need to calibrate them however. using an attenuator is not a good idea, too unprecise. still tvcs are the most precise way to measure, if done right. pretty tme consuming though. but you need them e.g. to calibrate a 4920.

adrian

Gesendet: Sonntag, 31. August 2014 um 21:41 Uhr
Von: "Charles Black" cblack@centurytel.net
An: "Discussion of precise voltage measurement" volt-nuts@febo.com
Betreff: Re: [volt-nuts] Datron 4920M, AC Voltmeter, for sale on ebay - 1 day left

Hi Stephen,

Thanks for the info on the 4920M. It might be that I should pass on this
but it is nice to know that it is probably working. If I don't have the
necessary items needed for calibration it might still be a good source
uncalibrated.

I was hoping that the 4920 had better minimum voltage out steps than my
present Rigol 4062 for 3458a AC calibration. I have two EL 1400 0.25V
voltage thermal converters that I was trying to use in a test setup but
they had such a low voltage range that I was forced to use my ATV-60
attenuator. It all kind of worked but a 0.1 db minimum step is a little
course for easy use. The Rigol also suffers from this malady.

Charlie

On 8/31/2014 1:06 PM, Stephen Grady wrote:

Charlie,

The "Error Ur" is an under-range error; you have to apply an input above 10% of the range before it will display a reading. The 4920's are a very nice instrument. Their only problem is that they are all so old that they are reaching the stage where some components are drifting excessively or failing. I have come across 4920's that are drifting a little (more than there spec) between cals (and yes they need to be cal'd annually), another 4920 I came across had an intermittent failure in one of its power supplies.

Kind Regards,

Stephen Grady
Sydney Australia

-----Original Message-----
From: volt-nuts [mailto:volt-nuts-bounces@febo.com] On Behalf Of Charles Black
Sent: Monday, 1 September 2014 3:19 AM
To: ben@veritechmeasurements.com.au; Discussion of precise voltage measurement
Subject: Re: [volt-nuts] Datron 4920M, AC Voltmeter, for sale on ebay - 1 day left

Hi Ben,

I am going to check this out today to find if it might be helpfull around here for my AC calibration. It has an error message: "Error Ur"
so some fixing is going to be needed. On the back it says it's got Option 80, whatever that is.

Charlie

On 8/31/2014 5:37 AM, ben wrote:

Hello all,
Just a heads up. I noted there is a lonely Datron / Wavetek 4920M AC
voltmeter for sale on ebay, starting at US$650 (ending in 1 day !). I
have little idea of its true working state or not (picture shows it powered on).
If fully working it would be a good buy for an AC voltmeter that is, I
reckon, better than an HP 3458A. Only drawback with these models is
the voltage input shell is always earthed, not floating. I have two of
these 4920M's already, not really tempted by a third. I have a paper
copies of operator, calibration, and service manual if anyone interested.

regards, ben.

volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
and follow the instructions there.

volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
and follow the instructions there.

This email is free from viruses and malware because avast! Antivirus protection is active.
http://www.avast.com

volt-nuts mailing list -- volt-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
and follow the instructions there.

charlie, you can expand these tvcs by range resistors to work as higher voltage tvcs. if you do it right (rf-type setup) you can work up to a couple hundred khz with just minor additional error beyond its error in its orgininal voltage range. need to calibrate them however. using an attenuator is not a good idea, too unprecise. still tvcs are the most precise way to measure, if done right. pretty tme consuming though. but you need them e.g. to calibrate a 4920. adrian > Gesendet: Sonntag, 31. August 2014 um 21:41 Uhr > Von: "Charles Black" <cblack@centurytel.net> > An: "Discussion of precise voltage measurement" <volt-nuts@febo.com> > Betreff: Re: [volt-nuts] Datron 4920M, AC Voltmeter, for sale on ebay - 1 day left > > Hi Stephen, > > Thanks for the info on the 4920M. It might be that I should pass on this > but it is nice to know that it is probably working. If I don't have the > necessary items needed for calibration it might still be a good source > uncalibrated. > > I was hoping that the 4920 had better minimum voltage out steps than my > present Rigol 4062 for 3458a AC calibration. I have two EL 1400 0.25V > voltage thermal converters that I was trying to use in a test setup but > they had such a low voltage range that I was forced to use my ATV-60 > attenuator. It all kind of worked but a 0.1 db minimum step is a little > course for easy use. The Rigol also suffers from this malady. > > Charlie > > On 8/31/2014 1:06 PM, Stephen Grady wrote: > > Charlie, > > > > > > The "Error Ur" is an under-range error; you have to apply an input above 10% of the range before it will display a reading. The 4920's are a very nice instrument. Their only problem is that they are all so old that they are reaching the stage where some components are drifting excessively or failing. I have come across 4920's that are drifting a little (more than there spec) between cals (and yes they need to be cal'd annually), another 4920 I came across had an intermittent failure in one of its power supplies. > > > > Kind Regards, > > > > Stephen Grady > > Sydney Australia > > > > -----Original Message----- > > From: volt-nuts [mailto:volt-nuts-bounces@febo.com] On Behalf Of Charles Black > > Sent: Monday, 1 September 2014 3:19 AM > > To: ben@veritechmeasurements.com.au; Discussion of precise voltage measurement > > Subject: Re: [volt-nuts] Datron 4920M, AC Voltmeter, for sale on ebay - 1 day left > > > > Hi Ben, > > > > I am going to check this out today to find if it might be helpfull around here for my AC calibration. It has an error message: "Error Ur" > > so some fixing is going to be needed. On the back it says it's got Option 80, whatever that is. > > > > Charlie > > > > > > On 8/31/2014 5:37 AM, ben wrote: > >> Hello all, > >> Just a heads up. I noted there is a lonely Datron / Wavetek 4920M AC > >> voltmeter for sale on ebay, starting at US$650 (ending in 1 day !). I > >> have little idea of its true working state or not (picture shows it powered on). > >> If fully working it would be a good buy for an AC voltmeter that is, I > >> reckon, better than an HP 3458A. Only drawback with these models is > >> the voltage input shell is always earthed, not floating. I have two of > >> these 4920M's already, not really tempted by a third. I have a paper > >> copies of operator, calibration, and service manual if anyone interested. > >> > >> regards, ben. > >> _______________________________________________ > >> volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to > >> https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > >> and follow the instructions there. > >> > >> > >> > > > > _______________________________________________ > > volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > > and follow the instructions there. > > > > > > --- > > This email is free from viruses and malware because avast! Antivirus protection is active. > > http://www.avast.com > > > > _______________________________________________ > > volt-nuts mailing list -- volt-nuts@febo.com > > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > > and follow the instructions there. > > > > > > > > > _______________________________________________ > volt-nuts mailing list -- volt-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > and follow the instructions there.

CB

Charles Black

Tue, Sep 2, 2014 3:13 AM

Hi Adrian,

I had some trouble testing my EL 1400's with my precsion attenuator
(1.2Ghz B/W) not having a small enough minimum step for easy setting. It
was fairly stable though. I checked everything with my scope and it was
fairly flat to 20mhz with a gentle falloff to 30mhz if I remember
correctly. The EL 1400's are "useable" to 300mhz with corrections that I
don't have.

I will keep an eye out for a low priced 4920. It will have to be broken
bad enough to be low priced though.

Charlie

On 9/1/2014 3:29 PM, acbern@gmx.de wrote:

charlie,

you can expand these tvcs by range resistors to work as higher voltage tvcs. if you do it right (rf-type setup) you can work up to a couple hundred khz with just minor additional error beyond its error in its orgininal voltage range. need to calibrate them however. using an attenuator is not a good idea, too unprecise. still tvcs are the most precise way to measure, if done right. pretty tme consuming though. but you need them e.g. to calibrate a 4920.

adrian

Gesendet: Sonntag, 31. August 2014 um 21:41 Uhr
Von: "Charles Black" cblack@centurytel.net
An: "Discussion of precise voltage measurement" volt-nuts@febo.com
Betreff: Re: [volt-nuts] Datron 4920M, AC Voltmeter, for sale on ebay - 1 day left

Hi Stephen,

Thanks for the info on the 4920M. It might be that I should pass on this
but it is nice to know that it is probably working. If I don't have the
necessary items needed for calibration it might still be a good source
uncalibrated.

I was hoping that the 4920 had better minimum voltage out steps than my
present Rigol 4062 for 3458a AC calibration. I have two EL 1400 0.25V
voltage thermal converters that I was trying to use in a test setup but
they had such a low voltage range that I was forced to use my ATV-60
attenuator. It all kind of worked but a 0.1 db minimum step is a little
course for easy use. The Rigol also suffers from this malady.

Charlie

On 8/31/2014 1:06 PM, Stephen Grady wrote:

Charlie,

The "Error Ur" is an under-range error; you have to apply an input above 10% of the range before it will display a reading. The 4920's are a very nice instrument. Their only problem is that they are all so old that they are reaching the stage where some components are drifting excessively or failing. I have come across 4920's that are drifting a little (more than there spec) between cals (and yes they need to be cal'd annually), another 4920 I came across had an intermittent failure in one of its power supplies.

Kind Regards,

Stephen Grady
Sydney Australia

-----Original Message-----
From: volt-nuts [mailto:volt-nuts-bounces@febo.com] On Behalf Of Charles Black
Sent: Monday, 1 September 2014 3:19 AM
To: ben@veritechmeasurements.com.au; Discussion of precise voltage measurement
Subject: Re: [volt-nuts] Datron 4920M, AC Voltmeter, for sale on ebay - 1 day left

Hi Ben,

I am going to check this out today to find if it might be helpfull around here for my AC calibration. It has an error message: "Error Ur"
so some fixing is going to be needed. On the back it says it's got Option 80, whatever that is.

Charlie

On 8/31/2014 5:37 AM, ben wrote:

Hello all,
Just a heads up. I noted there is a lonely Datron / Wavetek 4920M AC
voltmeter for sale on ebay, starting at US$650 (ending in 1 day !). I
have little idea of its true working state or not (picture shows it powered on).
If fully working it would be a good buy for an AC voltmeter that is, I
reckon, better than an HP 3458A. Only drawback with these models is
the voltage input shell is always earthed, not floating. I have two of
these 4920M's already, not really tempted by a third. I have a paper
copies of operator, calibration, and service manual if anyone interested.

regards, ben.

volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
and follow the instructions there.

volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
and follow the instructions there.

This email is free from viruses and malware because avast! Antivirus protection is active.
http://www.avast.com

volt-nuts mailing list -- volt-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
and follow the instructions there.

Hi Adrian, I had some trouble testing my EL 1400's with my precsion attenuator (1.2Ghz B/W) not having a small enough minimum step for easy setting. It was fairly stable though. I checked everything with my scope and it was fairly flat to 20mhz with a gentle falloff to 30mhz if I remember correctly. The EL 1400's are "useable" to 300mhz with corrections that I don't have. I will keep an eye out for a low priced 4920. It will have to be broken bad enough to be low priced though. Charlie On 9/1/2014 3:29 PM, acbern@gmx.de wrote: > charlie, > > you can expand these tvcs by range resistors to work as higher voltage tvcs. if you do it right (rf-type setup) you can work up to a couple hundred khz with just minor additional error beyond its error in its orgininal voltage range. need to calibrate them however. using an attenuator is not a good idea, too unprecise. still tvcs are the most precise way to measure, if done right. pretty tme consuming though. but you need them e.g. to calibrate a 4920. > > adrian > >> Gesendet: Sonntag, 31. August 2014 um 21:41 Uhr >> Von: "Charles Black" <cblack@centurytel.net> >> An: "Discussion of precise voltage measurement" <volt-nuts@febo.com> >> Betreff: Re: [volt-nuts] Datron 4920M, AC Voltmeter, for sale on ebay - 1 day left >> >> Hi Stephen, >> >> Thanks for the info on the 4920M. It might be that I should pass on this >> but it is nice to know that it is probably working. If I don't have the >> necessary items needed for calibration it might still be a good source >> uncalibrated. >> >> I was hoping that the 4920 had better minimum voltage out steps than my >> present Rigol 4062 for 3458a AC calibration. I have two EL 1400 0.25V >> voltage thermal converters that I was trying to use in a test setup but >> they had such a low voltage range that I was forced to use my ATV-60 >> attenuator. It all kind of worked but a 0.1 db minimum step is a little >> course for easy use. The Rigol also suffers from this malady. >> >> Charlie >> >> On 8/31/2014 1:06 PM, Stephen Grady wrote: >>> Charlie, >>> >>> >>> The "Error Ur" is an under-range error; you have to apply an input above 10% of the range before it will display a reading. The 4920's are a very nice instrument. Their only problem is that they are all so old that they are reaching the stage where some components are drifting excessively or failing. I have come across 4920's that are drifting a little (more than there spec) between cals (and yes they need to be cal'd annually), another 4920 I came across had an intermittent failure in one of its power supplies. >>> >>> Kind Regards, >>> >>> Stephen Grady >>> Sydney Australia >>> >>> -----Original Message----- >>> From: volt-nuts [mailto:volt-nuts-bounces@febo.com] On Behalf Of Charles Black >>> Sent: Monday, 1 September 2014 3:19 AM >>> To: ben@veritechmeasurements.com.au; Discussion of precise voltage measurement >>> Subject: Re: [volt-nuts] Datron 4920M, AC Voltmeter, for sale on ebay - 1 day left >>> >>> Hi Ben, >>> >>> I am going to check this out today to find if it might be helpfull around here for my AC calibration. It has an error message: "Error Ur" >>> so some fixing is going to be needed. On the back it says it's got Option 80, whatever that is. >>> >>> Charlie >>> >>> >>> On 8/31/2014 5:37 AM, ben wrote: >>>> Hello all, >>>> Just a heads up. I noted there is a lonely Datron / Wavetek 4920M AC >>>> voltmeter for sale on ebay, starting at US$650 (ending in 1 day !). I >>>> have little idea of its true working state or not (picture shows it powered on). >>>> If fully working it would be a good buy for an AC voltmeter that is, I >>>> reckon, better than an HP 3458A. Only drawback with these models is >>>> the voltage input shell is always earthed, not floating. I have two of >>>> these 4920M's already, not really tempted by a third. I have a paper >>>> copies of operator, calibration, and service manual if anyone interested. >>>> >>>> regards, ben. >>>> _______________________________________________ >>>> volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to >>>> https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts >>>> and follow the instructions there. >>>> >>>> >>>> >>> _______________________________________________ >>> volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts >>> and follow the instructions there. >>> >>> >>> --- >>> This email is free from viruses and malware because avast! Antivirus protection is active. >>> http://www.avast.com >>> >>> _______________________________________________ >>> volt-nuts mailing list -- volt-nuts@febo.com >>> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts >>> and follow the instructions there. >>> >>> >>> >> >> _______________________________________________ >> volt-nuts mailing list -- volt-nuts@febo.com >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts >> and follow the instructions there. > _______________________________________________ > volt-nuts mailing list -- volt-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > and follow the instructions there. > > >

A

acbern@gmx.de

Tue, Sep 2, 2014 7:53 AM

folks,

does anybody know the difference in specs between a 4920M and the standard 4920. No data on the web.

thanks

Gesendet: Sonntag, 31. August 2014 um 23:41 Uhr
Von: "Charles Black" cblack@centurytel.net
An: "Discussion of precise voltage measurement" volt-nuts@febo.com
Betreff: Re: [volt-nuts] Datron 4920M, AC Voltmeter, for sale on ebay - 1 day left

Hi Stephen,

Thanks for the info on the 4920M. It might be that I should pass on this
but it is nice to know that it is probably working. If I don't have the
necessary items needed for calibration it might still be a good source
uncalibrated.

I was hoping that the 4920 had better minimum voltage out steps than my
present Rigol 4062 for 3458a AC calibration. I have two EL 1400 0.25V
voltage thermal converters that I was trying to use in a test setup but
they had such a low voltage range that I was forced to use my ATV-60
attenuator. It all kind of worked but a 0.1 db minimum step is a little
course for easy use. The Rigol also suffers from this malady.

Charlie

On 8/31/2014 1:06 PM, Stephen Grady wrote:

Charlie,

The "Error Ur" is an under-range error; you have to apply an input above 10% of the range before it will display a reading. The 4920's are a very nice instrument. Their only problem is that they are all so old that they are reaching the stage where some components are drifting excessively or failing. I have come across 4920's that are drifting a little (more than there spec) between cals (and yes they need to be cal'd annually), another 4920 I came across had an intermittent failure in one of its power supplies.

Kind Regards,

Stephen Grady
Sydney Australia

-----Original Message-----
From: volt-nuts [mailto:volt-nuts-bounces@febo.com] On Behalf Of Charles Black
Sent: Monday, 1 September 2014 3:19 AM
To: ben@veritechmeasurements.com.au; Discussion of precise voltage measurement
Subject: Re: [volt-nuts] Datron 4920M, AC Voltmeter, for sale on ebay - 1 day left

Hi Ben,

I am going to check this out today to find if it might be helpfull around here for my AC calibration. It has an error message: "Error Ur"
so some fixing is going to be needed. On the back it says it's got Option 80, whatever that is.

Charlie

On 8/31/2014 5:37 AM, ben wrote:

Hello all,
Just a heads up. I noted there is a lonely Datron / Wavetek 4920M AC
voltmeter for sale on ebay, starting at US$650 (ending in 1 day !). I
have little idea of its true working state or not (picture shows it powered on).
If fully working it would be a good buy for an AC voltmeter that is, I
reckon, better than an HP 3458A. Only drawback with these models is
the voltage input shell is always earthed, not floating. I have two of
these 4920M's already, not really tempted by a third. I have a paper
copies of operator, calibration, and service manual if anyone interested.

regards, ben.

volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to
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folks, does anybody know the difference in specs between a 4920M and the standard 4920. No data on the web. thanks > Gesendet: Sonntag, 31. August 2014 um 23:41 Uhr > Von: "Charles Black" <cblack@centurytel.net> > An: "Discussion of precise voltage measurement" <volt-nuts@febo.com> > Betreff: Re: [volt-nuts] Datron 4920M, AC Voltmeter, for sale on ebay - 1 day left > > Hi Stephen, > > Thanks for the info on the 4920M. It might be that I should pass on this > but it is nice to know that it is probably working. If I don't have the > necessary items needed for calibration it might still be a good source > uncalibrated. > > I was hoping that the 4920 had better minimum voltage out steps than my > present Rigol 4062 for 3458a AC calibration. I have two EL 1400 0.25V > voltage thermal converters that I was trying to use in a test setup but > they had such a low voltage range that I was forced to use my ATV-60 > attenuator. It all kind of worked but a 0.1 db minimum step is a little > course for easy use. The Rigol also suffers from this malady. > > Charlie > > On 8/31/2014 1:06 PM, Stephen Grady wrote: > > Charlie, > > > > > > The "Error Ur" is an under-range error; you have to apply an input above 10% of the range before it will display a reading. The 4920's are a very nice instrument. Their only problem is that they are all so old that they are reaching the stage where some components are drifting excessively or failing. I have come across 4920's that are drifting a little (more than there spec) between cals (and yes they need to be cal'd annually), another 4920 I came across had an intermittent failure in one of its power supplies. > > > > Kind Regards, > > > > Stephen Grady > > Sydney Australia > > > > -----Original Message----- > > From: volt-nuts [mailto:volt-nuts-bounces@febo.com] On Behalf Of Charles Black > > Sent: Monday, 1 September 2014 3:19 AM > > To: ben@veritechmeasurements.com.au; Discussion of precise voltage measurement > > Subject: Re: [volt-nuts] Datron 4920M, AC Voltmeter, for sale on ebay - 1 day left > > > > Hi Ben, > > > > I am going to check this out today to find if it might be helpfull around here for my AC calibration. It has an error message: "Error Ur" > > so some fixing is going to be needed. On the back it says it's got Option 80, whatever that is. > > > > Charlie > > > > > > On 8/31/2014 5:37 AM, ben wrote: > >> Hello all, > >> Just a heads up. I noted there is a lonely Datron / Wavetek 4920M AC > >> voltmeter for sale on ebay, starting at US$650 (ending in 1 day !). I > >> have little idea of its true working state or not (picture shows it powered on). > >> If fully working it would be a good buy for an AC voltmeter that is, I > >> reckon, better than an HP 3458A. Only drawback with these models is > >> the voltage input shell is always earthed, not floating. I have two of > >> these 4920M's already, not really tempted by a third. I have a paper > >> copies of operator, calibration, and service manual if anyone interested. > >> > >> regards, ben. > >> _______________________________________________ > >> volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to > >> https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > >> and follow the instructions there. > >> > >> > >> > > > > _______________________________________________ > > volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > > and follow the instructions there. > > > > > > --- > > This email is free from viruses and malware because avast! Antivirus protection is active. > > http://www.avast.com > > > > _______________________________________________ > > volt-nuts mailing list -- volt-nuts@febo.com > > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > > and follow the instructions there. > > > > > > > > > _______________________________________________ > volt-nuts mailing list -- volt-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > and follow the instructions there.

SG

Stephen Grady

Tue, Sep 2, 2014 10:23 AM

The Datron 4920M was a special version of the 4920 made for the military, the major difference is the M version has a 50 Ohm (N-female) wideband input and only the N-female input for the low frequency input. Whereas the 4920 has a Binding Post Input as well as the N-female input. I am not aware of the specs for the wideband input but the low frequency input will be the same for both models.

I intend to reply in some detail soon on the calibration of these instruments (and this will also apply to the Fluke 5790) and the principals of AC calibration below 100mV as Charles has raised the issue of using attenuators to do lower voltage measurements.

Kind Regards,

Stephen Grady
Sydney, Australia

-----Original Message-----
From: volt-nuts [mailto:volt-nuts-bounces@febo.com] On Behalf Of acbern@gmx.de
Sent: Tuesday, 2 September 2014 5:54 PM
To: Discussion of precise voltage measurement
Subject: Re: [volt-nuts] Datron 4920M, AC Voltmeter, for sale on ebay - 1 day left

folks,

does anybody know the difference in specs between a 4920M and the standard 4920. No data on the web.

thanks

Gesendet: Sonntag, 31. August 2014 um 23:41 Uhr
Von: "Charles Black" cblack@centurytel.net
An: "Discussion of precise voltage measurement" volt-nuts@febo.com
Betreff: Re: [volt-nuts] Datron 4920M, AC Voltmeter, for sale on ebay

1 day left

Hi Stephen,

Thanks for the info on the 4920M. It might be that I should pass on
this but it is nice to know that it is probably working. If I don't
have the necessary items needed for calibration it might still be a
good source uncalibrated.

I was hoping that the 4920 had better minimum voltage out steps than
my present Rigol 4062 for 3458a AC calibration. I have two EL 1400
0.25V voltage thermal converters that I was trying to use in a test
setup but they had such a low voltage range that I was forced to use
my ATV-60 attenuator. It all kind of worked but a 0.1 db minimum step
is a little course for easy use. The Rigol also suffers from this malady.

Charlie

On 8/31/2014 1:06 PM, Stephen Grady wrote:

Charlie,

The "Error Ur" is an under-range error; you have to apply an input above 10% of the range before it will display a reading. The 4920's are a very nice instrument. Their only problem is that they are all so old that they are reaching the stage where some components are drifting excessively or failing. I have come across 4920's that are drifting a little (more than there spec) between cals (and yes they need to be cal'd annually), another 4920 I came across had an intermittent failure in one of its power supplies.

Kind Regards,

Stephen Grady
Sydney Australia

-----Original Message-----
From: volt-nuts [mailto:volt-nuts-bounces@febo.com] On Behalf Of
Charles Black
Sent: Monday, 1 September 2014 3:19 AM
To: ben@veritechmeasurements.com.au; Discussion of precise voltage
measurement
Subject: Re: [volt-nuts] Datron 4920M, AC Voltmeter, for sale on
ebay - 1 day left

Hi Ben,

I am going to check this out today to find if it might be helpfull around here for my AC calibration. It has an error message: "Error Ur"
so some fixing is going to be needed. On the back it says it's got Option 80, whatever that is.

Charlie

On 8/31/2014 5:37 AM, ben wrote:

Hello all,
Just a heads up. I noted there is a lonely Datron / Wavetek 4920M
AC voltmeter for sale on ebay, starting at US$650 (ending in 1 day
!). I have little idea of its true working state or not (picture shows it powered on).
If fully working it would be a good buy for an AC voltmeter that
is, I reckon, better than an HP 3458A. Only drawback with these
models is the voltage input shell is always earthed, not floating.
I have two of these 4920M's already, not really tempted by a third.
I have a paper copies of operator, calibration, and service manual if anyone interested.

regards, ben.

volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
and follow the instructions there.

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The Datron 4920M was a special version of the 4920 made for the military, the major difference is the M version has a 50 Ohm (N-female) wideband input and only the N-female input for the low frequency input. Whereas the 4920 has a Binding Post Input as well as the N-female input. I am not aware of the specs for the wideband input but the low frequency input will be the same for both models. I intend to reply in some detail soon on the calibration of these instruments (and this will also apply to the Fluke 5790) and the principals of AC calibration below 100mV as Charles has raised the issue of using attenuators to do lower voltage measurements. Kind Regards, Stephen Grady Sydney, Australia -----Original Message----- From: volt-nuts [mailto:volt-nuts-bounces@febo.com] On Behalf Of acbern@gmx.de Sent: Tuesday, 2 September 2014 5:54 PM To: Discussion of precise voltage measurement Subject: Re: [volt-nuts] Datron 4920M, AC Voltmeter, for sale on ebay - 1 day left folks, does anybody know the difference in specs between a 4920M and the standard 4920. No data on the web. thanks > Gesendet: Sonntag, 31. August 2014 um 23:41 Uhr > Von: "Charles Black" <cblack@centurytel.net> > An: "Discussion of precise voltage measurement" <volt-nuts@febo.com> > Betreff: Re: [volt-nuts] Datron 4920M, AC Voltmeter, for sale on ebay > - 1 day left > > Hi Stephen, > > Thanks for the info on the 4920M. It might be that I should pass on > this but it is nice to know that it is probably working. If I don't > have the necessary items needed for calibration it might still be a > good source uncalibrated. > > I was hoping that the 4920 had better minimum voltage out steps than > my present Rigol 4062 for 3458a AC calibration. I have two EL 1400 > 0.25V voltage thermal converters that I was trying to use in a test > setup but they had such a low voltage range that I was forced to use > my ATV-60 attenuator. It all kind of worked but a 0.1 db minimum step > is a little course for easy use. The Rigol also suffers from this malady. > > Charlie > > On 8/31/2014 1:06 PM, Stephen Grady wrote: > > Charlie, > > > > > > The "Error Ur" is an under-range error; you have to apply an input above 10% of the range before it will display a reading. The 4920's are a very nice instrument. Their only problem is that they are all so old that they are reaching the stage where some components are drifting excessively or failing. I have come across 4920's that are drifting a little (more than there spec) between cals (and yes they need to be cal'd annually), another 4920 I came across had an intermittent failure in one of its power supplies. > > > > Kind Regards, > > > > Stephen Grady > > Sydney Australia > > > > -----Original Message----- > > From: volt-nuts [mailto:volt-nuts-bounces@febo.com] On Behalf Of > > Charles Black > > Sent: Monday, 1 September 2014 3:19 AM > > To: ben@veritechmeasurements.com.au; Discussion of precise voltage > > measurement > > Subject: Re: [volt-nuts] Datron 4920M, AC Voltmeter, for sale on > > ebay - 1 day left > > > > Hi Ben, > > > > I am going to check this out today to find if it might be helpfull around here for my AC calibration. It has an error message: "Error Ur" > > so some fixing is going to be needed. On the back it says it's got Option 80, whatever that is. > > > > Charlie > > > > > > On 8/31/2014 5:37 AM, ben wrote: > >> Hello all, > >> Just a heads up. I noted there is a lonely Datron / Wavetek 4920M > >> AC voltmeter for sale on ebay, starting at US$650 (ending in 1 day > >> !). I have little idea of its true working state or not (picture shows it powered on). > >> If fully working it would be a good buy for an AC voltmeter that > >> is, I reckon, better than an HP 3458A. Only drawback with these > >> models is the voltage input shell is always earthed, not floating. > >> I have two of these 4920M's already, not really tempted by a third. > >> I have a paper copies of operator, calibration, and service manual if anyone interested. > >> > >> regards, ben. > >> _______________________________________________ > >> volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to > >> https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > >> and follow the instructions there. > >> > >> > >> > > > > _______________________________________________ > > volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to > > https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > > and follow the instructions there. > > > > > > --- > > This email is free from viruses and malware because avast! Antivirus protection is active. > > http://www.avast.com > > > > _______________________________________________ > > volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to > > https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > > and follow the instructions there. > > > > > > > > > _______________________________________________ > volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > and follow the instructions there. _______________________________________________ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there. --- This email is free from viruses and malware because avast! Antivirus protection is active. http://www.avast.com

A

acbern@gmx.de

Tue, Sep 2, 2014 12:40 PM

thanks, I would welcome comments on calibration too.

Gesendet: Dienstag, 02. September 2014 um 12:23 Uhr
Von: "Stephen Grady" grady.steve@gmail.com
An: "'Discussion of precise voltage measurement'" volt-nuts@febo.com
Betreff: Re: [volt-nuts] Datron 4920M, AC Voltmeter, for sale on ebay - 1 day left

The Datron 4920M was a special version of the 4920 made for the military, the major difference is the M version has a 50 Ohm (N-female) wideband input and only the N-female input for the low frequency input. Whereas the 4920 has a Binding Post Input as well as the N-female input. I am not aware of the specs for the wideband input but the low frequency input will be the same for both models.

I intend to reply in some detail soon on the calibration of these instruments (and this will also apply to the Fluke 5790) and the principals of AC calibration below 100mV as Charles has raised the issue of using attenuators to do lower voltage measurements.

Kind Regards,

Stephen Grady
Sydney, Australia

-----Original Message-----
From: volt-nuts [mailto:volt-nuts-bounces@febo.com] On Behalf Of acbern@gmx.de
Sent: Tuesday, 2 September 2014 5:54 PM
To: Discussion of precise voltage measurement
Subject: Re: [volt-nuts] Datron 4920M, AC Voltmeter, for sale on ebay - 1 day left

folks,

does anybody know the difference in specs between a 4920M and the standard 4920. No data on the web.

thanks

Gesendet: Sonntag, 31. August 2014 um 23:41 Uhr
Von: "Charles Black" cblack@centurytel.net
An: "Discussion of precise voltage measurement" volt-nuts@febo.com
Betreff: Re: [volt-nuts] Datron 4920M, AC Voltmeter, for sale on ebay

1 day left

Hi Stephen,

Thanks for the info on the 4920M. It might be that I should pass on
this but it is nice to know that it is probably working. If I don't
have the necessary items needed for calibration it might still be a
good source uncalibrated.

I was hoping that the 4920 had better minimum voltage out steps than
my present Rigol 4062 for 3458a AC calibration. I have two EL 1400
0.25V voltage thermal converters that I was trying to use in a test
setup but they had such a low voltage range that I was forced to use
my ATV-60 attenuator. It all kind of worked but a 0.1 db minimum step
is a little course for easy use. The Rigol also suffers from this malady.

Charlie

On 8/31/2014 1:06 PM, Stephen Grady wrote:

Charlie,

The "Error Ur" is an under-range error; you have to apply an input above 10% of the range before it will display a reading. The 4920's are a very nice instrument. Their only problem is that they are all so old that they are reaching the stage where some components are drifting excessively or failing. I have come across 4920's that are drifting a little (more than there spec) between cals (and yes they need to be cal'd annually), another 4920 I came across had an intermittent failure in one of its power supplies.

Kind Regards,

Stephen Grady
Sydney Australia

-----Original Message-----
From: volt-nuts [mailto:volt-nuts-bounces@febo.com] On Behalf Of
Charles Black
Sent: Monday, 1 September 2014 3:19 AM
To: ben@veritechmeasurements.com.au; Discussion of precise voltage
measurement
Subject: Re: [volt-nuts] Datron 4920M, AC Voltmeter, for sale on
ebay - 1 day left

Hi Ben,

I am going to check this out today to find if it might be helpfull around here for my AC calibration. It has an error message: "Error Ur"
so some fixing is going to be needed. On the back it says it's got Option 80, whatever that is.

Charlie

On 8/31/2014 5:37 AM, ben wrote:

Hello all,
Just a heads up. I noted there is a lonely Datron / Wavetek 4920M
AC voltmeter for sale on ebay, starting at US$650 (ending in 1 day
!). I have little idea of its true working state or not (picture shows it powered on).
If fully working it would be a good buy for an AC voltmeter that
is, I reckon, better than an HP 3458A. Only drawback with these
models is the voltage input shell is always earthed, not floating.
I have two of these 4920M's already, not really tempted by a third.
I have a paper copies of operator, calibration, and service manual if anyone interested.

regards, ben.

volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
and follow the instructions there.

This email is free from viruses and malware because avast! Antivirus protection is active.
http://www.avast.com

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To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
and follow the instructions there.

thanks, I would welcome comments on calibration too. > Gesendet: Dienstag, 02. September 2014 um 12:23 Uhr > Von: "Stephen Grady" <grady.steve@gmail.com> > An: "'Discussion of precise voltage measurement'" <volt-nuts@febo.com> > Betreff: Re: [volt-nuts] Datron 4920M, AC Voltmeter, for sale on ebay - 1 day left > > The Datron 4920M was a special version of the 4920 made for the military, the major difference is the M version has a 50 Ohm (N-female) wideband input and only the N-female input for the low frequency input. Whereas the 4920 has a Binding Post Input as well as the N-female input. I am not aware of the specs for the wideband input but the low frequency input will be the same for both models. > > I intend to reply in some detail soon on the calibration of these instruments (and this will also apply to the Fluke 5790) and the principals of AC calibration below 100mV as Charles has raised the issue of using attenuators to do lower voltage measurements. > > Kind Regards, > > Stephen Grady > Sydney, Australia > > -----Original Message----- > From: volt-nuts [mailto:volt-nuts-bounces@febo.com] On Behalf Of acbern@gmx.de > Sent: Tuesday, 2 September 2014 5:54 PM > To: Discussion of precise voltage measurement > Subject: Re: [volt-nuts] Datron 4920M, AC Voltmeter, for sale on ebay - 1 day left > > folks, > > does anybody know the difference in specs between a 4920M and the standard 4920. No data on the web. > > thanks > > > > > Gesendet: Sonntag, 31. August 2014 um 23:41 Uhr > > Von: "Charles Black" <cblack@centurytel.net> > > An: "Discussion of precise voltage measurement" <volt-nuts@febo.com> > > Betreff: Re: [volt-nuts] Datron 4920M, AC Voltmeter, for sale on ebay > > - 1 day left > > > > Hi Stephen, > > > > Thanks for the info on the 4920M. It might be that I should pass on > > this but it is nice to know that it is probably working. If I don't > > have the necessary items needed for calibration it might still be a > > good source uncalibrated. > > > > I was hoping that the 4920 had better minimum voltage out steps than > > my present Rigol 4062 for 3458a AC calibration. I have two EL 1400 > > 0.25V voltage thermal converters that I was trying to use in a test > > setup but they had such a low voltage range that I was forced to use > > my ATV-60 attenuator. It all kind of worked but a 0.1 db minimum step > > is a little course for easy use. The Rigol also suffers from this malady. > > > > Charlie > > > > On 8/31/2014 1:06 PM, Stephen Grady wrote: > > > Charlie, > > > > > > > > > The "Error Ur" is an under-range error; you have to apply an input above 10% of the range before it will display a reading. The 4920's are a very nice instrument. Their only problem is that they are all so old that they are reaching the stage where some components are drifting excessively or failing. I have come across 4920's that are drifting a little (more than there spec) between cals (and yes they need to be cal'd annually), another 4920 I came across had an intermittent failure in one of its power supplies. > > > > > > Kind Regards, > > > > > > Stephen Grady > > > Sydney Australia > > > > > > -----Original Message----- > > > From: volt-nuts [mailto:volt-nuts-bounces@febo.com] On Behalf Of > > > Charles Black > > > Sent: Monday, 1 September 2014 3:19 AM > > > To: ben@veritechmeasurements.com.au; Discussion of precise voltage > > > measurement > > > Subject: Re: [volt-nuts] Datron 4920M, AC Voltmeter, for sale on > > > ebay - 1 day left > > > > > > Hi Ben, > > > > > > I am going to check this out today to find if it might be helpfull around here for my AC calibration. It has an error message: "Error Ur" > > > so some fixing is going to be needed. On the back it says it's got Option 80, whatever that is. > > > > > > Charlie > > > > > > > > > On 8/31/2014 5:37 AM, ben wrote: > > >> Hello all, > > >> Just a heads up. I noted there is a lonely Datron / Wavetek 4920M > > >> AC voltmeter for sale on ebay, starting at US$650 (ending in 1 day > > >> !). I have little idea of its true working state or not (picture shows it powered on). > > >> If fully working it would be a good buy for an AC voltmeter that > > >> is, I reckon, better than an HP 3458A. Only drawback with these > > >> models is the voltage input shell is always earthed, not floating. > > >> I have two of these 4920M's already, not really tempted by a third. > > >> I have a paper copies of operator, calibration, and service manual if anyone interested. > > >> > > >> regards, ben. > > >> _______________________________________________ > > >> volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to > > >> https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > > >> and follow the instructions there. > > >> > > >> > > >> > > > > > > _______________________________________________ > > > volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to > > > https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > > > and follow the instructions there. > > > > > > > > > --- > > > This email is free from viruses and malware because avast! Antivirus protection is active. > > > http://www.avast.com > > > > > > _______________________________________________ > > > volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to > > > https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > > > and follow the instructions there. > > > > > > > > > > > > > > > _______________________________________________ > > volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to > > https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > > and follow the instructions there. > _______________________________________________ > volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > and follow the instructions there. > > > --- > This email is free from viruses and malware because avast! Antivirus protection is active. > http://www.avast.com > > _______________________________________________ > volt-nuts mailing list -- volt-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > and follow the instructions there.

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Datron 4920M, AC Voltmeter, for sale on ebay - 1 day left