8-33
Performance Tests
RF level Accuracy Performance Test
NOTE For 8648B/C/D instruments without Option 1EA, high power, skip ahead to
“Configure the Power Meter”. All others, continue with the next step.
Configure the 8648 Option 1EA
1. Set the amplitude; press AMPLITUDE 10 dB(m).
2. Turn the Rf output on; press
RF ON/OFF.
3. Connect the power sensor directly to the 8648 RF OUTPUT connector.
Measure the High Power Level Accuracy
1. measure the RF power at each frequency listed in Table 8-1 and record the
measurement in the first row of the table.
2. Connect the 10 dB attenuator between the 8648 RF OUTPUT connector and the power
sensor.
3. Measure the RF power at each frequency listed in Table 8-1 and record the
measurement in the second row of the table.
4. Calculate the actual attenuator value for each frequency (the difference between the
two measurements) and record it in the third row of the table.
5. For each frequency listed in Table 8-1 set the 8648 amplitude to the level shown in the
table and measure the RF power level through the 10 dB attenuator. Record the
measurement in the fifth row of the table.
6. Calculate the actual output power for each frequency (the sum of the measured power
and the attenuator value) and record it in the test record.
7. Record the test results and compare the results to the limits in the test record.
Table 8-1 High Power Level Accuracy Work Table
Frequency (MHz) 3.0 249.9 400 999.9 1500 2100 2500 3200 4000
Power without
10 dB Attenuator
Power with 10 dB
Attenuator
Attenuator Value
Amplitude
Setting (dBm)
20 20 20 20 19 17 15 13 13
Measured Power
Actual Output
Power
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