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How to calibrate Siglent SPD1000X / SPD3303X / SPD3303X-E series power supplies?
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mawyatt:
Also noticed the long period to stabilize for the 34401A. Think this is because they don't have a fan, while the other high end modern DMMs all have fans which help achieve thermal equilibrium quicker.

Best,
oz2cpu:
bad driver, you cant use the auto range.. need to make it 200uV always, else the curves will confuse us :-)

here is the left unit, maybe we should just come down back to earth :-)
noise of 0.1mV is NOT bad, not at all..

C.J.S.:

--- Quote from: oz2cpu on December 19, 2021, 07:42:32 pm ---maybe we should just come down back to earth :-)
noise of 0.1mV is NOT bad, not at all..

--- End quote ---

And well below the ripple+noise spec of ≤1mVrms(5Hz ~ 1MHz).
Although you would need an AC mV meter with adjustable bandwidth to measure this ripple+noise spec.
Bad_Driver:
Ok, I used a boring TEAMs meeting to do a first measurement.

Siglent SDM3065, 2 V DC, 10 PLC, Auto-Zero, !0 Mohms
TestController software, 1 reading per second, 12 min

first photo: raw data
second photo: average over 20 readings

As stated by oz2cpu we see a kind of oscillation.

Edit: Pics in better quality
mawyatt:
This does seem to have a low frequency and much higher frequency content in the waveform. An FFT on the data should revel the details and show these.

Best,
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