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Agilent MSO-X 3014A DC offset
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Phoenix6478:
Hello Everyone  :)

I just got a used Agilent MSO-X 3014A scope and I would like to ask a question about the DC offset. All 4 channels show a DC offset of roughly -2mV (1:1 ratio) with the inputs shorted. It has been around 8 years since the scope was user calibrated.

If I buy the needed coax cables and BNC adapters for the user calibration cable, will the offset go away after the calibration? I am familiar with the self calibration of Rigol Oscilloscopes and there the DC offset gets calibrated away. Will this also be the case for the Agilent scope? I am also planning to perform the 500Mhz frontend hardware mod, so i would need the calibration coax setup anyways.

Thank you in advance!

Best
Phoenix
HighVoltage:
That seems like a lot of offset, especially on all 4 channels.
What are your "acquire" settings?
How big is the noise?

My oldest 3000x scope is about the same age as yours and it has not shifted the DC offset at all.
Phoenix6478:
Thanks for your reply!

The differrent Acquire modes do not influence the offset. The noise is around 1.5mVpp on all the channels.

I did the Hardware Self-Test of the scope and it says that all self tests are passed. It also seems to behave as expected under all other situations. Also the DC accuracy is good compared to my Fluke 289 if i manually center the offset to 0v before the measurement.
TheSteve:
Odds are very good a Usercal will fix it. Even without seeing any offset I'd perform a Usercal before performing the 500 MHz upgrade just to verify everything is working as expected.
Phoenix6478:
Thank you for the advice, I already ordered the RG58 coax cables and the BNC adapters to build the calibration setup. I will let you know how it goes once i performed the usercal.
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