Specifications

8
Change the time base to 5 ns/div.
Wait a few seconds for the measurement to settle (the
Av
letters in the status
line indicate how much of the averaging process is finished by turning to
inverse video as the oscilloscope performs averaging), then note the V
p-p
reading from the bottom of the display.
V
p-p
= ______ mV.
9
Calculate the response using the following formula.
20 log
10



step
8
re sult
step
4
result



10
Correct the result from step 9 with any difference in the power meter
reading from step 7. Make sure you observe all number signs.
Example
Result from step 9 = –2.3 dB
Power meter reading from step 7 = –0.2 dB (REL)
True response = (–2.3) – (–0.2) = –2.1 dB
The true response should be
≤ ±
3 dB.
If the result is not
≤ ±
3 dB, see "Troubleshooting the Oscilloscope."
11
Repeat steps 1 to 10 for channel 2.
Channel 2 is labeled "2" on HP 54645A and "A2" on HP 54645D.
12
Repeat steps 1 to 11 for 5 mV/div.
a
Substitute -20.5 dBm in step 3.
b
Substitute 75 MHz in steps 6 and 7.
Testing, Adjusting, and Troubleshooting
To verify bandwidth
7-21