Keysight N2791A/N2891A High-Voltage Differential Probes User Guide 29
N2791A Performance Verification Procedures
N2791A Performance Verification Procedures
The following procedure can be used to test the DC differential gain
accuracy and bandwidth of the N2791A differential probe. Please note that
these procedures do not indicate that these characteristics are warranted.
Instead, these procedures are meant to give you an idea of how your probe
performs.
Table 6 Required Test Equipment
DC Differential Gain Accuracy
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 64.
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.
Description Critical Specifications Recommended Model Part Number Functions
Digitizing
Oscilloscope
Bandwidth: >50 MHz
1 MΩ/50Ω selectable input
Keysight MSO9254A Display probe output
Signal Generator
Precision DC voltage
source
Amplitude accuracy: less than or equal
to 0.25%
1 MΩ/50Ω selectable load
Sine wave greater than or equal to 25
MHz
Fluke 9500B Signal source for DC gain and
bandwidth
BNC Adapter BNC (f) to Dual Banana (m) Adapter Keysight 1251-2277 Interconnection between probe and
generator
50 Ω BNC Feed
Through Adapter
50 Ω precision feed through Keysight 11048C Termination between probe and
calibrator for bandwidth verification
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