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Issues (?) with Keithley 2231A-30-3 DC Power Supply

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Wil_Bloodworth:
I ordered a Keithley 2231A-30-3 DC power supply and it seems like there might be a problem with stability.  Channel one seems fine-ish but channels two and three just seem a bit suspicious.

Channel 2 and 3 don't want to stay on the voltages type in.  If I put 2.0 into channel 2, it will drift down to 1.99.  In order for the screen to stay at 2.0, I have to enter 2.01... see photos below.

Please watch this video on what it's doing and let me know if you think there is an issue I.
https://youtu.be/ECfJka0ihAI







Thoughts?

Thank you,

- Wil

tooki:
That’s a 10mV discrepancy.

That power supply’s specs list 0.06%+20mV setpoint accuracy and 0.06%+20mV readback accuracy. So even if we ignore the %, that’s up to 40mV discrepancy between setpoint and readback. You’re well, well within spec.

skander36:
This is not a voltage reference.
For a power source is a very good precission.

BennoG:
I have the same unit for a couple of months now and I like it.
I only find the display a little dim compared to the meters I have.

I have also written a program to control it from the PC so I can turn every output on and of at will and not all at the same time.

Benno

Wil_Bloodworth:
Great!  I feel a lot better about the purchase now. Thank you!

- Wil

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