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Rigol DHO0804 starts up with large, varying offset (bias) voltages

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devinw:
Like the title says, when I power the unit up, the bias voltages on the channels is always different, especially channel 2. 2 has been anywhere from 100 to 250mV, and yesterday it was 800mV! I realize this is not a DMM, but 800mV seems simply outrageous for any oscilloscope. I realize I can enter in a bias voltage for each channel, but that doesn't help if it boots up to a different bias each time. Is there some internal cal it runs when starting up that is screwy?

Anyone else experience this? Or should I send this thing back?

Fungus:
Have you run the calibration?

devinw:

--- Quote from: Fungus on November 08, 2024, 06:19:13 pm ---Have you run the calibration?

--- End quote ---

I just tried the self cal. After the cal, all channels were looking good with low offset. We'll see how it is on the next bootup.

devinw:
I've had the unit powered on for a few minutes and CH1 is averaging about 4mV bias, and CH2 is 60mV. The 60mV one was under 1mV yesterday after self-cal and using it for a few hours. I think I'm sending this thing back unfortunately.

Fungus:
You have to let it warm up, but... 60mV sounds like a lot to me after "a few minutes".

Does it go away with time?

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