Electronics > Repair

Fluke 343A repair

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bastl_r:
Hello
How much drift of the 15V reference voltage can realistically be expected during a few hours on a Fluke343 calibrator?
The temperature is approx. 25°C +/-1°.
Measurements are made with a K2002.

Greetings bastl_r

bastl_r:
Renewed question about the drift of the reference voltage of my 343::
Is it normal that I find a difference of about 20µV on the min/max display after about 8 - 9 hours with the K2002?
So 14.999682xV and 14.999665xV.
This means a drift of approx. 1.1ppm. It feels like 20µV is too much, but 1.3ppm is still quite low for such a device.
Or is it?

regards bastl_r

Rax:
Sorry, bastl_r, I no longer have one at my bench. Hopefully those that do will assess your condition.

bastl_r:
Thank you for your answer.
I realise that the stability of any calibrator is finite and I am aware of the efforts being made to constantly increase it. However, the 20uV over 8 to 9 hours spontaneously seems a bit much to me.
But I would still be happy if I am wrong.

Greetings bastl_r

unseenninja:

--- Quote from: bastl_r on August 31, 2024, 11:46:00 am ---Thank you for your answer.
I realise that the stability of any calibrator is finite and I am aware of the efforts being made to constantly increase it. However, the 20uV over 8 to 9 hours spontaneously seems a bit much to me.
But I would still be happy if I am wrong.

Greetings bastl_r

--- End quote ---

I'm wondering if I'm seeing a similar problem which my 343A has developed. When I first received it, the calibration was poor, but the calibrator seemed stable, so I performed the adjustment procedure using my recently adjusted and calibrated Solartron 7061. After that, everything seemed fine and I didn't use the 343A for some time.

Recently, I became the owner of a Datron 1271. As part of checking its performance, I started a log of 10V from the 343A. To my horror, what used to be 10.00000V from the 343A was now more like 10.001V and is falling by a rate of 4ppm every 24 hours. I logged a whole week before I got bored of waiting for the curve to level out.



The specifications for the 343A are very conservative, but even worst case, this is outside of specifications. I have not yet had the time to investigate what the problem could be and have been following this thread with interest in your progress.

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