Empathy List Archives

KG

Ken Goodhew

Thu, Apr 30, 2015 5:52 PM

I have been trying to check the calibration of my HP3456A multimeter.

I can check and set the DC volts calibration ok but when I try and set the
ohms calibration using standard resistors I cannot get a steady reading as
the display varies by several digits regardless of the value of the
resistance being used to check the meter.

I have already changed most of the power supply filter capacitors to see if
this solved the problem, which it did not.

The only capacitors I have not changed are the two larger ones that tested
ok for capacitance and esr.

Any suggestions as what the problem may be or where I am going wrong in my
calibration attempts?

Thanks,

Ken Goodhew.

VK2TKE.

I have been trying to check the calibration of my HP3456A multimeter. I can check and set the DC volts calibration ok but when I try and set the ohms calibration using standard resistors I cannot get a steady reading as the display varies by several digits regardless of the value of the resistance being used to check the meter. I have already changed most of the power supply filter capacitors to see if this solved the problem, which it did not. The only capacitors I have not changed are the two larger ones that tested ok for capacitance and esr. Any suggestions as what the problem may be or where I am going wrong in my calibration attempts? Thanks, Ken Goodhew. VK2TKE.

JP

John Phillips

Thu, Apr 30, 2015 7:41 PM

Connections and Current source are about all that is left.

On Thu, Apr 30, 2015 at 10:52 AM, Ken Goodhew kgoodhew@iinet.net.au wrote:

I have been trying to check the calibration of my HP3456A multimeter.

I can check and set the DC volts calibration ok but when I try and set the
ohms calibration using standard resistors I cannot get a steady reading as
the display varies by several digits regardless of the value of the
resistance being used to check the meter.

I have already changed most of the power supply filter capacitors to see if
this solved the problem, which it did not.

The only capacitors I have not changed are the two larger ones that tested
ok for capacitance and esr.

Any suggestions as what the problem may be or where I am going wrong in my
calibration attempts?

Thanks,

Ken Goodhew.

VK2TKE.

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--

John Phillips

Connections and Current source are about all that is left. On Thu, Apr 30, 2015 at 10:52 AM, Ken Goodhew <kgoodhew@iinet.net.au> wrote: > I have been trying to check the calibration of my HP3456A multimeter. > > I can check and set the DC volts calibration ok but when I try and set the > ohms calibration using standard resistors I cannot get a steady reading as > the display varies by several digits regardless of the value of the > resistance being used to check the meter. > > I have already changed most of the power supply filter capacitors to see if > this solved the problem, which it did not. > > The only capacitors I have not changed are the two larger ones that tested > ok for capacitance and esr. > > Any suggestions as what the problem may be or where I am going wrong in my > calibration attempts? > > Thanks, > > Ken Goodhew. > > VK2TKE. > > _______________________________________________ > 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. > -- *John Phillips*

CC

Cowham, Chuck

Thu, Apr 30, 2015 8:05 PM

Ken,

Coincidently, I just recalibrated a pair of 3456A meters I have been running 24/7 for over a year.

10 V and 1 V ranges were no problem with adjustment pots having very good resolution.

1 K, 10 K, and 100 K pots were a little more fiddly. I used 10 PLC averages for setting the pots, and then 100 PLC to re-check the setting was within 1 count. Reading stability on these ranges with 100 PLC was 1 count, or less.

-- Chuck

-----Original Message-----
From: volt-nuts [mailto:volt-nuts-bounces@febo.com] On Behalf Of Ken Goodhew
Sent: Thursday, April 30, 2015 1:52 PM
To: volt-nuts@febo.com
Subject: [volt-nuts] hp 3456a ohms calibration

I have been trying to check the calibration of my HP3456A multimeter.

I can check and set the DC volts calibration ok but when I try and set the ohms calibration using standard resistors I cannot get a steady reading as the display varies by several digits regardless of the value of the resistance being used to check the meter.

I have already changed most of the power supply filter capacitors to see if this solved the problem, which it did not.

The only capacitors I have not changed are the two larger ones that tested ok for capacitance and esr.

Any suggestions as what the problem may be or where I am going wrong in my calibration attempts?

Thanks,

Ken Goodhew.

VK2TKE.

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.

Ken, Coincidently, I just recalibrated a pair of 3456A meters I have been running 24/7 for over a year. 10 V and 1 V ranges were no problem with adjustment pots having very good resolution. 1 K, 10 K, and 100 K pots were a little more fiddly. I used 10 PLC averages for setting the pots, and then 100 PLC to re-check the setting was within 1 count. Reading stability on these ranges with 100 PLC was 1 count, or less. -- Chuck -----Original Message----- From: volt-nuts [mailto:volt-nuts-bounces@febo.com] On Behalf Of Ken Goodhew Sent: Thursday, April 30, 2015 1:52 PM To: volt-nuts@febo.com Subject: [volt-nuts] hp 3456a ohms calibration I have been trying to check the calibration of my HP3456A multimeter. I can check and set the DC volts calibration ok but when I try and set the ohms calibration using standard resistors I cannot get a steady reading as the display varies by several digits regardless of the value of the resistance being used to check the meter. I have already changed most of the power supply filter capacitors to see if this solved the problem, which it did not. The only capacitors I have not changed are the two larger ones that tested ok for capacitance and esr. Any suggestions as what the problem may be or where I am going wrong in my calibration attempts? Thanks, Ken Goodhew. VK2TKE. _______________________________________________ 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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hp 3456a ohms calibration