After experience with the 1000:1 output and the DUT, some rough conclusions may be made, such as DUT open or shorted, or it may be used to detect degradation of the DUT over time.
The accuracy of the 1000:1 probe is shown in this link. It shows the accuracy of the 1000:1 BNC output compared to tester output and front panel meter indication for the MegaPulse 1.2x50-12, with output accuracy shown from 400V to 12kV. Other testers will show similar accuracy.
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