Hi Illya:
When I try to view your web page the message is:
Secure Connection Failed
--
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
The lesser of evils is still evil.
-------- Original Message --------
Aha! :)
Hi David,
First few sour points to make sure you got what to expect.
* 520$USD is bit steep for 2001 from 90's you got, and VFD seem to be fairly
faded according to auction pics.
* It may be still have issues internally, even though showing reading does not
reveal anything in first glance.
2001's are fairly capable DMMs and I personally dealt with no less than 7pcs of them over last years. Currently I
still own four units of same age as your win (judge from S/N). While they are worse than 2002/3458 in terms of
stability/noise, I would not trade my 2001's to fancy 3446X/34470 meters.
Also 2001 support scan-card addons so you can easily expand DMM with scanner function, or even nanovolt-preamp if you
dedicated enough. I'm working on nanovolt support with 2001, but that's long story. Some details with DIY card I
covered here: https://xdevs.com/review/ema10/
To get you ready:
1). It's bit tricky to setup and need little bit of time to get familiar with, but otherwise on par with modern
34470/DMM7510 with bit worse resistance/current specs. No RS232, so bit more expenses to come for GPIB interfacing if
you don't have that already.
As Todd pointed out already to my repair article, some bits of info are linked there, as well as firmwares and
documentation.
Here's example test log with reading 1mV DC voltage with three meters :
2001,2002,3458. https://xdevs.com/datalog_tcomp/
2001 also using almost exactly same ACV TrueRMS converter as 8.5 Model 2002, so
that's good too if you into AC stuff.
I also have thread on EEVBlog: http://www.eevblog.com/forum/testgear/restoration-glory-of-keithley-2001-dmm/ in case
you missed it.
2) I never played with 3457A, but 2001 should offer better stability, less noise and more functionality in smaller
package. I do take 2001 with me to remote locations sometimes to do some testing, thanks to it's relatively small size
and weight.
4-5) You should update firmware to A08, which I hosted on links above, if you desire to have meter calibrated by
accredited lab, such as Tektronix service center. Otherwise they might charge you for replacing simple PLCC ROM. Your
digital board is older version, so you tied to A-version smaller firmwares w/o support of unobtanium nanovolt Keithley
1801 preamp. You will not loose existing calibration on firmware update.
6) This is my favorite part. Here's what you have to do:
* Receive meter, take the cover off
* Remove transformer, carefully remove plastic cover of analog board (top side)
* Get the board out.
* Replace ALL electrolytic capacitors on it. Follow my article for details.
This is requirement, believe me.
* If you already see gunk, liquid from caps - carefully clean board, restore any damaged traces/parts. If it leaked
under ICs - you have to desolder them, clean in IPA thoroughly and solder back.
* If your VFD too dim and you desire bright nice glow - you can buy Keithley 7001 switch with good screen from ebay
(they can be found for 100-150$) and swap VFD. Not worth to bother asking Tek for new VFD, they sell front panel board
only for ridiculous tag.
* Replace caps on bottom digital board.
* Install memory option if you like
* You can deyellow plastic front panel with peroxide:
https://xdevs.com/guide/plastic_bleach/
* Enjoy the meter.
I sent one of 2001's for official cal here in Taiwan, it was 500$ for full cal with data. Cheaper than 8.5 DMMs but
still bit pricey. To do user calibration you will need very stable 2V, 20V, 20kOhm and 1MOhm standards. Make sure you
have meter running at least for a week before sending to cal, to get everything stable.
P.S. there is no much point in 8.5th digit from 2001, as it's just down in
noise.
BR,
Illya
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