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I have quite a numbers of TDP1000 that couldn't have accurate measurements when using with DPO5204B.
The probe's internal offset could be eliminated in Auto mode, and I guess auto mode means the 4.25V range. However, when it switched to 42Vpk range, the DPO5204B showed a very large offset but the auto zero process still passed.
After auto zero was pressed in various mode and range:
~80mV offset in 4.25V range; ~(-ve)200mV offset in 42Vpk range
The oscilloscope's firmware has been updated, SPC passed, diagnostics passed.
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