I have a PS4444 scope (SN: FS786/0025) and have found significant DC measurement error. My test setup consisted of a BK Precision 4053B Waveform Generator whose output connected to my PS under test and a Keysight 34461A reference DMM.
I double checked the readings with a Fluke handheld multimeter so I know the ref DMM is accurate.
When I apply test DC voltages with the waveform generator, and compare the results from the PS and DMM, I see up to 90 mV difference in the two. The error seems to scale with voltage.
Here is the data I collected:
Code: Select all
voltage(V) measured error(V)
-9 0.075
-5 0.035
-2 0.00769
-1 -0.00067
1 -0.0231
2 -0.0319
5 -0.06118
9 -0.0959
Can you help me address this error? Maybe my PS is not configured correctly?