HP 54616B User And Service Manual page 104

Service
Verifying Oscilloscope Performance
Change the time base to 5 ns/div.
8
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 Vp-p
reading from the bottom of the display.
Vp-p = ______ mV.
Calculate the response using the following formula.
9
20 log
Correct the result from step 9 with any difference in the power meter
10
reading from step 7. Make sure you observe all number signs.
For 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," on page
4-32.
Repeat steps 1 to 10 for channel 2.
11
4-12
 
step 8 result
 
10
step 4 result
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