Agilent Technologies 54657A Dokumentacja Strona 104

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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 Vp-p
reading from the bottom of the display.
Vp-p = ______ mV.
9
Calculate the response using the following formula.
20 log
10
step 8 result
step 4 re s ult
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.
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.
11
Repeat steps 1 to 10 for channel 2.
Service
Verifying Oscilloscope Performance
4-12
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