User`s guide

21
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.
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 s 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  impedance.
3 Set the calibrator 9500B’s channel 2 as the trigger channel (50  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 M 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 N2791A probe to channel 1 of the oscilloscope.
8 Attach the BNC adapter to the Fluke channel 1 active head.
Description Critical Specifications Recommended Model
Part Number
Functions
Digitizing Oscilloscope Bandwidth: >50 MHz
1 M/50 selectable input
Agilent MSO9254A Display probe output
Signal Generator
Precision DC voltage source
Amplitude accuracy: less than or
equal to 0.25%
1 M/50 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
Agilent 1251-2277 Interconnection
between probe and
generator
50  BNC Feed Through
Adapter
50  precision feed through Agilent 11048C Termination between
probe and calibrator
for bandwidth
verification