Re: [volt-nuts] Solartron 7081 NVM FAIL (David C. Partridge)
My Zener's the glass diode style, no physical connection to the AD590.
Do you know the approximate manufacturing date of yours? I've actually
never seen a 1N829 in a metal can, but before mfgrs figured out how to
do glass-passivated packaging, metal cans were common. That was in the
early days, well before this meter was built, so this is interesting.
--
Bill Ezell
They said 'Windows or better'
so I used Linux.
Judging by the dates on the ICs, my serial number 185 meter was built sometime in 1983.
Further on the topic of zener current tokens. On my good 7081 there's a small label in the rear RHS corner of the lower floating board (board 5 with the zener on). This label reads:
SRL016 072
24K 82K
The meter's zener value is 072.
The 7071 has a similar label which reads:
110/113/11 085
but I can't check its zener token value as the meter is in pieces (borrowed the VFD and earthy boards to work on the bad 7081).
The 7081 with the bad ER-3400 NVM (does anyone have some of these?) has a label that reads:
5T/284/40 103
(Not sure about the 5T there - it's a bit smudged)
Please could I ask other 7081 and 7071 owners if they would check this label in their meters, compare against the actual zener current token, and report back? If you don't know this you can get it by issuing "CALIBRATE,DUMP" over the serial or GPIB ports.
D.
-----Original Message-----
From: volt-nuts-bounces@febo.com [mailto:volt-nuts-bounces@febo.com] On Behalf Of Bill Ezell
Sent: 26 April 2012 11:55
To: volt-nuts@febo.com
Subject: Re: [volt-nuts] Solartron 7081 NVM FAIL (David C. Partridge)
My Zener's the glass diode style, no physical connection to the AD590.
Do you know the approximate manufacturing date of yours? I've actually never seen a 1N829 in a metal can, but before mfgrs figured out how to do glass-passivated packaging, metal cans were common. That was in the early days, well before this meter was built, so this is interesting.
--
Bill Ezell
They said 'Windows or better'
so I used Linux.
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.
Joe Trantham report his meter has a label w/r ST/258/28 081 and his zener calibration token is 081
This looks promising, as my 7071 (now mostly back together) has a token value of 085 which matches its label.
Dave
-----Original Message-----
From: volt-nuts-bounces@febo.com [mailto:volt-nuts-bounces@febo.com] On Behalf Of David C. Partridge
Sent: 26 April 2012 12:17
To: 'Discussion of precise voltage measurement'
Subject: Re: [volt-nuts] Solartron 7081 NVM FAIL (David C. Partridge)
Judging by the dates on the ICs, my serial number 185 meter was built sometime in 1983.
Further on the topic of zener current tokens. On my good 7081 there's a small label in the rear RHS corner of the lower floating board (board 5 with the zener on). This label reads:
SRL016 072
24K 82K
The meter's zener value is 072.
The 7071 has a similar label which reads:
110/113/11 085
but I can't check its zener token value as the meter is in pieces (borrowed the VFD and earthy boards to work on the bad 7081).
The 7081 with the bad ER-3400 NVM (does anyone have some of these?) has a label that reads:
5T/284/40 103
(Not sure about the 5T there - it's a bit smudged)
Please could I ask other 7081 and 7071 owners if they would check this label in their meters, compare against the actual zener current token, and report back? If you don't know this you can get it by issuing "CALIBRATE,DUMP" over the serial or GPIB ports.
D.
-----Original Message-----
From: volt-nuts-bounces@febo.com [mailto:volt-nuts-bounces@febo.com] On Behalf Of Bill Ezell
Sent: 26 April 2012 11:55
To: volt-nuts@febo.com
Subject: Re: [volt-nuts] Solartron 7081 NVM FAIL (David C. Partridge)
My Zener's the glass diode style, no physical connection to the AD590.
Do you know the approximate manufacturing date of yours? I've actually never seen a 1N829 in a metal can, but before mfgrs figured out how to do glass-passivated packaging, metal cans were common. That was in the early days, well before this meter was built, so this is interesting.
--
Bill Ezell
They said 'Windows or better'
so I used Linux.
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.
Hi, David!
My 7081 meter has a label
HC137/10 076
3k 82k
Zener current token is 076.
Regards,
Mickle T.
Friday, April 27, 2012, 4:41:00 AM, you wrote:
DCP> Joe Trantham report his meter has a label w/r ST/258/28 081 and his zener calibration token is 081
DCP> This looks promising, as my 7071 (now mostly back together) has a token
DCP> value of 085 which matches its label.
David,
With the Zener Token Value is it now possible to do an accurate cal,
assuming all else works and the zener has not been replaced?
Also, any idea what the significance of the other numbers is?
Joe
-----Original Message-----
From: volt-nuts-bounces@febo.com [mailto:volt-nuts-bounces@febo.com] On
Behalf Of Ìèõàèë (Mickle)
Sent: Thursday, April 26, 2012 11:22 PM
To: Discussion of precise voltage measurement
Subject: Re: [volt-nuts] Solartron 7081 NVM FAIL (David C. Partridge)
Hi, David!
My 7081 meter has a label
HC137/10 076
3k 82k
Zener current token is 076.
Regards,
Mickle T.
Friday, April 27, 2012, 4:41:00 AM, you wrote:
DCP> Joe Trantham report his meter has a label w/r ST/258/28 081 and
DCP> his zener calibration token is 081 This looks promising, as my 7071
DCP> (now mostly back together) has a token value of 085 which matches
DCP> its label.
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