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strange data acquisition


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I have a PXI setup with a PXIe-4081 DMM in it.
I am trying to capture a current waveform, at 25kHz.
For some reason the first 8 seconds of the data capture seem to float, after which the signal stabilizes.

Does anyone know the cause, and solution for this problem?

below is a snapshot of the data.

image.png.5a3a7bc302949bd66dba46e56a1120c6.png

The DMM is connected in series with a LED load, which is connected to a DUT.

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  • 2 weeks later...

Try configuring the DMM to use a single range. If there is an auto range function active, it might explain the waveform.

Can you post the circuit?

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On 3/30/2021 at 7:11 PM, Gribo said:

Try configuring the DMM to use a single range. If there is an auto range function active, it might explain the waveform.

Can you post the circuit?

i have tried that, with the same result.

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