Re: [volt-nuts] Datron 4000 DC/I/R Standard
That seems like a nice piece of equipment if it works or is easily
repairable. Why do you assume the displays are broken? If they used
gas discharge displays, they would likely be Nixie or Panaplex type,
which are pretty durable, and are still common enough to not be a
problem with procurement. There is also plenty of data out there
about these items and their drivers. The most common failures I have
seen in these types of displays are bad digit drive transistors, and
sometimes bad segment drive ICs - the tubes themselves usually don't
just crap out, but gradually darken or fade out.
I don't know about the manuals, but if you do locate one in pdf form,
please share it if possible - it's nice to have access to that info
for reference material even without owning one of the units.
Ed
Ed, thanks for your comments.
In an image of the unit, it appears the front panel is a bit dented near the displays, and I'm worried they might be damaged - they are glass envelopes after all.
I have managed to find a thread on a Chinese forum (possibly the same forum I've seen referenced in the past) with some pretty excellent photos of the internal construction (website intermittent, possibly blocking some IP ranges).
http://bbs.38hot.net/read.php?tid=14354
Notice they do not use a buried zener voltage reference but a 1N829, see in particular the post on the second page discussing the voltage reference board
http://bbs.38hot.net/read.php?tid=14354&ds=1&page=2#159876
I've been bitten by the bug... all stemming from trying to repair a Keithley 2000
Andy Bardagjy
bardagjy.com
On Dec 18, 2012, at 12:21 PM, ed breya wrote:
That seems like a nice piece of equipment if it works or is easily repairable. Why do you assume the displays are broken? If they used gas discharge displays, they would likely be Nixie or Panaplex type, which are pretty durable, and are still common enough to not be a problem with procurement. There is also plenty of data out there about these items and their drivers. The most common failures I have seen in these types of displays are bad digit drive transistors, and sometimes bad segment drive ICs - the tubes themselves usually don't just crap out, but gradually darken or fade out.
I don't know about the manuals, but if you do locate one in pdf form, please share it if possible - it's nice to have access to that info for reference material even without owning one of the units.
Ed
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Hi, Andy!
Thread you have found on bbs.38hot.net was created by me :) And there is another
small message about Reference sub-board schematics on the russian
http://www.radiokot.ru/forum/viewtopic.php?f=10&t=52829&start=180
All information I have about Datron 4000(A) is here:
http://www.mediafire.com/download.php?d4lrsde7zv0cyry (27 Mb!)
Regards,
Mickle/iddqd2001
Mickle, wow thanks! Really great work you've done, I'm still digesting everything, spent quite a bit of time on that Russian forum. Also,I think I may have found a source for printed manuals but they are quite expensive.
Really excited to see what shape my 4000 is in
Andy Bardagjy
bardagjy.com
On Dec 18, 2012, at 2:57 PM, Михаил (Mickle) wrote:
Hi, Andy!
Thread you have found on bbs.38hot.net was created by me :) And there is another
small message about Reference sub-board schematics on the russian
http://www.radiokot.ru/forum/viewtopic.php?f=10&t=52829&start=180
All information I have about Datron 4000(A) is here:
http://www.mediafire.com/download.php?d4lrsde7zv0cyry (27 Mb!)
Regards,
Mickle/iddqd2001
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I have seen a few Datron units with flickering or unstable displays that came up perfect when the display power supply electrolytic was replaced.
Regards,
Laurence Motteram
-----Original Message-----
From: volt-nuts-bounces@febo.com [mailto:volt-nuts-bounces@febo.com] On Behalf Of ed breya
Sent: Wednesday, 19 December 2012 4:21 AM
To: volt-nuts@febo.com
Subject: Re: [volt-nuts] Datron 4000 DC/I/R Standard
That seems like a nice piece of equipment if it works or is easily repairable. Why do you assume the displays are broken? If they used gas discharge displays, they would likely be Nixie or Panaplex type, which are pretty durable, and are still common enough to not be a problem with procurement. There is also plenty of data out there about these items and their drivers. The most common failures I have seen in these types of displays are bad digit drive transistors, and sometimes bad segment drive ICs - the tubes themselves usually don't just crap out, but gradually darken or fade out.
I don't know about the manuals, but if you do locate one in pdf form, please share it if possible - it's nice to have access to that info for reference material even without owning one of the units.
Ed
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I am looking for the service manual of the Datron 4200A AC calibrator. I was unable to find anything neither on the net nor by manuals sellers !
Thanks
From: Laurence Motteram LMotteram@scientific-devices.com.au
To: Discussion of precise voltage measurement volt-nuts@febo.com
Sent: Tuesday, December 18, 2012 10:26 PM
Subject: Re: [volt-nuts] Datron 4000 DC/I/R Standard
I have seen a few Datron units with flickering or unstable displays that came up perfect when the display power supply electrolytic was replaced.
Regards,
Laurence Motteram
-----Original Message-----
From: volt-nuts-bounces@febo.com [mailto:volt-nuts-bounces@febo.com] On Behalf Of ed breya
Sent: Wednesday, 19 December 2012 4:21 AM
To: volt-nuts@febo.com
Subject: Re: [volt-nuts] Datron 4000 DC/I/R Standard
That seems like a nice piece of equipment if it works or is easily repairable. Why do you assume the displays are broken? If they used gas discharge displays, they would likely be Nixie or Panaplex type, which are pretty durable, and are still common enough to not be a problem with procurement. There is also plenty of data out there about these items and their drivers. The most common failures I have seen in these types of displays are bad digit drive transistors, and sometimes bad segment drive ICs - the tubes themselves usually don't just crap out, but gradually darken or fade out.
I don't know about the manuals, but if you do locate one in pdf form, please share it if possible - it's nice to have access to that info for reference material even without owning one of the units.
Ed
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