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4. Set the signal generator for 1MHz at − 2.4 dBm. On the oscilloscope, select RUN - REPETITIVE. The
signal on the screen should be two cycles at three divisions amplitude.
5. After the measurement settles (averaging complete, about 15 seconds), select STOP. In the
Auto-Measure menu note the V
p-p
reading. V
1MHz
= __________ mV.
6. Set the power meter Cal Factor % to the 1MHz value from the calibration chart on the power splitter.
Then press dB[REF] to set a 0 dB reference.
7. Change the signal generator to 250 MHz. Set power meter Cal Factor % to the 250 MHz value from
the chart.
8. Adjust the signal generator amplitude for a power reading as close as possible to 0.0 dB[REL].
Reading = __________ dB.
9. Set the oscilloscope s/Div for 2 ns/Div and select RUN-REPETITIVE.
10. After the measurement settles (averaging complete), select STOP. In the Auto-Measure menu note
the V
p-p
reading. V
250MHz
= ________mV.
11. Calculate the response using the formula:
response
(
dB
) = 20 log
10
V
250
Mhz
V
1
MHz
= 20
log
10
(_____) = ______
dB
12. Correct the result from step 11 with any differences in the power meter from step 8. Observe signs.
For example:
Result from step 11 = − 2.3 dB
Power meter reading = − 0.2 dB[REL]
then true response = (− 2.3) − (− 0.2) − 2.1dB
(__________) − (__________) = ____________ dB
13. The result from step 12 should be ≤ − 3.0 dB. Record the result in the Performance Test Record.
14. In the Channel menu select channel 2. In the Waveform Selection menu delete channel 1 and
insert channel 2.
15. Repeat steps 2 through 14 for channel 2, replacing channel 1 with channel 2 where applicable.
Note
Failure of the bandwidth test can be caused by a faulty attenuator or main
assembly.
HP 16532A - Performance Tests
3-12