Author Topic: Restoration glory of Keithley 2001 DMM  (Read 205749 times)

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Offline TiN

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Re: Restoration glory of Keithley 2001 DMM
« Reply #600 on: September 18, 2016, 09:11:54 am »
Preparing some 2001 for upcoming sale out  ;)

Initial calibration and check on 10V from Time 9823 MFC.



Guardband - Both K2002's and 3458A down below, absolute tolerance +/-1.5ppm (Both 2002 calibrated 25/08/2016 versus <30day 732B).
Blue charts - 3 different K2001's.
Dashed brown line - ambient temperature.

Clearly visible ADC performance difference between different league meters  :-DMM
« Last Edit: September 18, 2016, 09:13:34 am by TiN »
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Offline Kjelt

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Re: Restoration glory of Keithley 2001 DMM
« Reply #601 on: September 18, 2016, 11:25:11 am »
Wow those 2002s play in a different league. How does the 2000 hold up against the 2001 ?
 

Offline TiN

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Re: Restoration glory of Keithley 2001 DMM
« Reply #602 on: September 18, 2016, 12:49:39 pm »
I don't have 2000 anymore, it found a new home while ago :)

But I had similar 10V test on 2002+2000+3458 before. Datalog here.
« Last Edit: September 18, 2016, 01:05:26 pm by TiN »
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Offline maxwell3e10

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Re: Restoration glory of Keithley 2001 DMM
« Reply #603 on: October 04, 2016, 03:10:41 am »
I have a K2001 that at some point started to show "Overflow ADC" on all ranges and functions. On xdevs I found Illya mentioned replacing U315 optocoupler to fix this. Should I check something else before trying to get this chip?

I have an old TLP582 optocoupler on my board in a large package. It seems one can also get them in a DIP-5 package. Would that be OK?
 

Offline maxwell3e10

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Re: Restoration glory of Keithley 2001 DMM
« Reply #604 on: October 04, 2016, 07:30:39 pm »
I found another Keithley 2001 to swap the ADC card with and it is the problem with the ADC card, not opto-couplers.

My ADC card has digital signals coming in and out on most pins, so its not dead.
I don't know what the digital data should look like, though. For example DATA_OUT looks a little erratic, not a clear serial pattern.
 

Offline kada

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Re: Restoration glory of Keithley 2001 DMM
« Reply #605 on: October 08, 2016, 01:38:55 pm »

SKE encountered with the same errors:
Self test reported these error codes:
200.1   A/D Zero
200.6   x0.02 Line Cycle Integration
200.7   x0.01 Line Cycle Integration
201.2   7V Reference
Did you find a solution?

I'm sorry for delayed report, the solution (TiN, you was right  :-+) was to update firmware to A08 and I don't have these errors anymore.
 
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Offline AF6LJ

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Re: Restoration glory of Keithley 2001 DMM
« Reply #606 on: October 12, 2016, 06:46:11 pm »
This has been a cool project to follow   :-+ :-+
Sue AF6LJ
Test Equipment Addict, And Proud Of It.
 

Offline connor

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Re: Restoration glory of Keithley 2001 DMM
« Reply #607 on: October 13, 2016, 12:27:45 pm »
My 2001 have this problem ,I donot know how to fix it???
 

Offline Signal32

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Re: Restoration glory of Keithley 2001 DMM
« Reply #608 on: October 13, 2016, 12:29:27 pm »
My 2001 have this problem ,I donot know how to fix it???
The err indicator is on ... is the front panel working ? Navigate to the list of errors and tell us what they are.
 

Offline connor

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Re: Restoration glory of Keithley 2001 DMM
« Reply #609 on: October 13, 2016, 12:34:36 pm »
My 2001 have this problem ,I donot know how to fix it???
The err indicator is on ... is the front panel working ? Navigate to the list of errors and tell us what they are.
Error ID=513  AC calibration data lost.
 

Offline Signal32

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Re: Restoration glory of Keithley 2001 DMM
« Reply #610 on: October 13, 2016, 12:40:19 pm »
Is that the only error or are there more ? Use <  > to switch between them.
 

Offline connor

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Re: Restoration glory of Keithley 2001 DMM
« Reply #611 on: October 13, 2016, 12:47:59 pm »
Is that the only error or are there more ? Use <  > to switch between them.
This error is not the built-in test error.when the power on ,it will show this error and then turn to the display page like the first picture. This problem can not run built-in test.
 

Offline TiN

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Re: Restoration glory of Keithley 2001 DMM
« Reply #612 on: October 13, 2016, 01:29:45 pm »
Just run AC calibration. It does not need any external equipment.
Do you have any other errors from self-test?
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Offline connor

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Re: Restoration glory of Keithley 2001 DMM
« Reply #613 on: October 13, 2016, 03:08:59 pm »
Just run AC calibration. It does not need any external equipment.
Do you have any other errors from self-test?
Thank you ,I will run AC calibration later .but now the 2001 have a big problem ,the panel display  "-------" ,like my first picture,when i run self-test the 2001 will crash, i must reboot it . 
the +5V ,+15V ,-15V ,+38V ,-38V is OK.
 

Offline TiN

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Re: Restoration glory of Keithley 2001 DMM
« Reply #614 on: October 13, 2016, 03:28:35 pm »
?rash? What you mean by crash?
If its turns off or hangs, turn the unit immediately off and read this thread from the first post :)

------- is default state if measurements system is not armed and waiting for trigger.
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Offline connor

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Re: Restoration glory of Keithley 2001 DMM
« Reply #615 on: October 13, 2016, 04:00:34 pm »
This 2001 made in 1993 or 1994.
I have read your blog,i have replace all electrolytic capacitors ,except the 15000UF/16v.
I replace the LM311,NE555 and fix the power problem.
The crash means the display have no changes when i press any keys. Always display -------,How to jump out this status? Thanks.
 

Offline TiN

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Re: Restoration glory of Keithley 2001 DMM
« Reply #616 on: October 13, 2016, 04:06:02 pm »
Even MENU button?
Is there any electrolyte on the boards or trace damage?
What is digital 5V voltage on digital board?
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Offline connor

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Re: Restoration glory of Keithley 2001 DMM
« Reply #617 on: October 14, 2016, 11:17:51 am »
The MENU button is ok.
There is a little  electrolyte ,i have clean it ,no trace damage.
digital board 5V is OK.
 

Offline TiN

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Re: Restoration glory of Keithley 2001 DMM
« Reply #618 on: October 14, 2016, 11:31:55 am »
How about self-test result then? :)
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Offline connor

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Re: Restoration glory of Keithley 2001 DMM
« Reply #619 on: October 14, 2016, 11:59:12 am »
Sometimes when the power on,the "ARM" will show on the top ,i can run self-test ,the result is ERR 200.2 ,200.3.
 sometimes i reboot it ,the "ARM" will not show there,the display always "-------",the self-test can not run finished ,the display will stop at any page,then all the buttons are not work.
 

Offline TiN

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Re: Restoration glory of Keithley 2001 DMM
« Reply #620 on: October 14, 2016, 12:03:18 pm »
Check your digital board or/and transformer and mains circuitry. Processor feeling sick, hence the hangs and communication errors (200.x)
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Offline connor

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Re: Restoration glory of Keithley 2001 DMM
« Reply #621 on: October 14, 2016, 12:21:58 pm »
Thanks ,i will check it .
Is it necessary to replace the 15000uf/16v on the digital board ?
 

Offline McBryce

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Re: Restoration glory of Keithley 2001 DMM
« Reply #622 on: October 14, 2016, 12:45:23 pm »
This may sound like a very stupid suggestion, but is there any chance that the trigger (or some other) button on the front panel is jammed on? I had a very similar "facepalm inducing" repair a few months back (not on a Keithley though).

McBryce.
 

Offline connor

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Re: Restoration glory of Keithley 2001 DMM
« Reply #623 on: October 14, 2016, 02:10:43 pm »
This may sound like a very stupid suggestion, but is there any chance that the trigger (or some other) button on the front panel is jammed on? I had a very similar "facepalm inducing" repair a few months back (not on a Keithley though).

McBryce.

Thanks,I check it already when this problem happened. :)
 

Offline Le_Bassiste

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Re: Restoration glory of Keithley 2001 DMM
« Reply #624 on: October 14, 2016, 03:36:16 pm »
Sometimes when the power on,the "ARM" will show on the top ,i can run self-test ,the result is ERR 200.2 ,200.3.
 sometimes i reboot it ,the "ARM" will not show there,the display always "-------",the self-test can not run finished ,the display will stop at any page,then all the buttons are not work.

i have one KEI2001 that had similar symptoms like yours: on cold-start (meaning that it was _cold_ on start-up, left off for a day or so), it came up with standard boot screen but then repeatedly ran into and out of DC OVERVOLTAGE, although range was set to AUTO and inputs shorted. on top of that, REAR annunciator was blinking with slow and irregular patterns. of course, self tests failed with similar results like yours did. these symptoms went away after about 10 mins of warm-up, and then the meter worked fine. 
ribbon cable that connects digital and analog board had flakey contact inside the connector on analog board. replaced connector with 0.100" 20pin two-row male header and made completely new cable. all good now.
« Last Edit: October 14, 2016, 03:38:08 pm by Le_Bassiste »
 


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