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Keithley 2000+2015 THD

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michl:
Hello Costas,

I have here a broken Keithley 2010 that shows overrange error after switching the device on. After some hours of 'warmup' the device will operate normally. The 2010 also contains this TF-245 and after reading your post I measured the resistances of my TF-245 and realized that there was no connection(resistance) between pin 9 and 7 and pin 10 and 12. I added some external resistors according to your measurement and the device is now behaving different. After startup it shows '---------' for some minutes and then measures without going to overrange (but the calibration is no more valid). So it seems that also my TF-245 seems to be broken. Did you already contact Keithley if they sell this resistor network as a spare part? Is your device working properly with the external resistors?

Michael       

costas:
Hello ,
My device is work properly  with external resistor , i contcat Keithley but I not got any answer ....


WBR
Costas

costas:
Hello ,
For Keithey lowers
I find TF 245 and work OK , in China ...
olso I buy Fluke 776195 IC and work ok
ther is the linck

E-mail: sales06@stj-tech.com
MSN: stjtech06@hotmail.com
Website:www.stj-tech.com

The price is ok , under 5$+  delivery cost...

wbr
Costas

Rick:
I hope my question does not come late.
You seem to have fixed your device.
Another person on Internet does not seem to have been able to fix totally his problems with his DMM (other problems).
I wonder if it is realistic for a person like me with almost no experience in such repairs to think he will be able to fix a totally broken Keithley 2000 with no schematic. I think there are instructions for troubleshooting in the service manual as well as board layouts but some parts have enigmatic names apparently internal to Keithley. I am very much tempted... but does not dare.
What would you recommend? To stay away? I may have better chances with Flukes but those ones are way too expensive. Sellers willing to sell broken dmms for 4-500.

costas:

--- Quote from: Rick on December 31, 2012, 09:29:25 pm ---I hope my question does not come late.
You seem to have fixed your device.
Another person on Internet does not seem to have been able to fix totally his problems with his DMM (other problems).
I wonder if it is realistic for a person like me with almost no experience in such repairs to think he will be able to fix a totally broken Keithley 2000 with no schematic. I think there are instructions for troubleshooting in the service manual as well as board layouts but some parts have enigmatic names apparently internal to Keithley. I am very much tempted... but does not dare.
What would you recommend? To stay away? I may have better chances with Flukes but those ones are way too expensive. Sellers willing to sell broken dmms for 4-500.

--- End quote ---

Hello

Happy New Year !

If you can or not fix it , you can not know unless you try. Besides some experience you must have other helpful items:
1. working equipment: a good solder-desodering station with hot air , oscilloscope, flash-EEPROM programmer with useful adapters , another multimeter for  tests and measurements (devices that know how to work somewhat)
2. ambition and time to repair
3. friends with whom you can discuss about the topic.
4. a strategy for abording  repair without scheme
if you want I can tell my srategia.

WBR
Costas

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