Keysight N2791A/N2891A High-Voltage Differential Probes User Guide 33
N2891A Performance Verification Procedures
1 Set the volts/division on channel 1 of the oscilloscope to 20 mV/div.
Set the seconds/div to 200 μs and the acquisition mode to average 32.
2 Set the volts/division on channel 2 of the oscilloscope to 500 mV/div.
Trigger on channel 2, select 50 Ω impedance.
3 Set the calibrator 9500B’s channel 2 as the trigger channel (50 Ω
load). Connect the calibrator’s channel 2 active head to channel 2 of
the oscilloscope.
4 Connect the active head channel 1 from the Fluke 9500B to channel 1
of the oscilloscope. Set the calibrator channel 1 to 0.1V peak-to-peak
amplitude and 1 KHz (square wave, 1 MΩ load), enable the output.
5 Select the amplitude measurement on the oscilloscope and record the
DC amplitude (approximately 100 mV) of the square wave. This
measurement is only the oscilloscope.
6 Disable the Fluke calibrator output, disconnect the channel 1 active
head from channel 1 of the oscilloscope.
7 Connect the output of the N2891A probe to channel 1 of the
oscilloscope.
8 Attach the BNC adapter to the Fluke channel 1 active head.
9 Attach the differential probe input leads by clipping the alligator clamp
to the BNC adapter banana post.
10 Set the probe to 100:1. Set the Fluke calibrator to 10 V and 1 KHz
standard amplitude output (channel 1, square wave, 1 MΩ load).
11 Enable the output of the calibrator.
12 Record the DC amplitude of the square wave and divide 100 into just
the amplitude of the oscilloscope.Verify that the probe gain accuracy is
±2% + scope gain accuracy.
13 Set the calibrator to 100 V output and set the attenuation button on
the probe to 1000:1.
14 Record the DC amplitude of the square wave and divide 10 into just the
amplitude of the oscilloscope. Verify that the probe gain accuracy is
±2% + scope gain accuracy.
15 Disable the calibrator output and leave the setup connected for the
next procedure.
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