HP 54645A User's And Service Manual page 209

Testing, Adjusting, and Troubleshooting
To verify bandwidth
Connect the equipment.
1
Connect the signal generator to the input of the power splitter.
a
Connect the power sensor to one output of the power splitter, and
b
connect channel 1 of the oscilloscope to the other power splitter
output. Put a 50- feedthrough at the input of the oscilloscope.
Channel 1 is labeled "1" on HP 54645A and "A1" on HP 54645D.
Set up the oscilloscope.
2
, then press the Default Setup softkey.
Press
a
Setup
Set the time base to 500 ns/div.
b
Set the Volts/Div for channel 1 to 200 mV/div.
c
Press
d
Display
Toggle the # Average softkey to select 8 averages.
e
Set the signal generator for 1 MHz at about +11.6 dBm.
3
Notice that the signal on the display is about 5 cycles and six divisions of
amplitude.
Press , then press the
4
Voltage
Wait a few seconds for the measurement to settle (averaging is complete),
then note the V reading from the bottom of the display.
p-p
V = _______ V.
p-p
Set the calibration factor percent of the power meter to the 1 MHz
5
value from the calibration chart on the probe, then press dB (REF)
on the power meter to set a 0 dB reference.
Change the frequency of the signal generator to 100 MHz.
6
Set the calibration factor of the power meter to the 100 MHz percent
7
value from the chart on the probe (interpolate the value between two
frequencies, if necessary).
Adjust the amplitude of the signal generator for a power reading as close as
possible to 0.0 dB (REL). Power meter reading = ______ dB.
7-20
, then press the Average softkey.
Vp-p softkey.