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Keithley 2400 SourceMeter review and teardown

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rksaripalli:
Dear Sir/Madam,

Myself Ravi Kiran Saripalli, PhD student in India. I have read the excellent review article by Tin regarding Keithley 2400 Source meter. I have been using the source meter regularly for poling my dielectric materials, by applying a voltage, and varying the temperature externally. I had heated my sample to 380K and connected the leads to the 2400, and just when I was about to increase the voltage, the 2400 just switched off, and is not powering on again (Input volate was 0V). Could you tell me what could have gone wrong and how to fix it? Thanks a lot.
Ragrads,
rksaripalli

TiN:
Hi Ravi,

Did you check mains fuse on unit? Voltage was applied to your test sample by 2400 itself or from other source?

K. Kumon:

--- Quote from: TiN on July 08, 2015, 04:25:27 pm ---Why Japan?

--- End quote ---

 (I'm living in Japan. :))

By the way, I recently obtained used 2400

The source part (voltage and current) seems OK with tens milli volt offset voltage.
But measurement part doesn't work at all.

The display always shows "-----" for both voltage and current.
When sampling rate is changed with config menu causes complete deadlock.
All button reply no response except power SW.

It seems as if sampling trigger is missing.

Does somebody kindly advice me how to fix it?

TiN:
What happens if you reset SMU to factory defaults? It should be reading values without any extra settings.
Perhaps stupid question, but does ON light come up when you enable output?

Take the cover off meter amd check if any cables or parts are damaged.

K. Kumon:

--- Quote from: TiN on November 29, 2015, 10:51:46 am ---What happens if you reset SMU to factory defaults? It should be reading values without any extra settings.
Perhaps stupid question, but does ON light come up when you enable output?

Take the cover off meter amd check if any cables or parts are damaged.

--- End quote ---
Hi, TiN,

Thanks for suggestion.

I did resetting to the factory default, but nothing has changed.
As the output on/off button pushing, LED (blue) is lit and output voltage comes up

The apparent of the unit is rather good condition, and VFD is still bright.
For this reason,  I've been hesitating to open, but I'm going to open it.

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