問題：
Why does my active probe calibration fail and why do I have a DC offset after it's done?
答案：
The calibration fixture used during probe calibration is the 067-0405-00 for probes such as the P6243 and P6245. It has a small jumper on the circuit board, behind the BNC connector labeled "A". It must be removed for this test to pass.
After the test is run, the oscilloscope still has the last DC offset set in the menu for this test. To return it to zero offset, enter the Vertical menu, select Offset, then open the Offset box and enter 0. Then close the window. Alternatively, you can press the default setup button.
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