Keysight Technologies N9040B UXA Signal Analyzer Service Guide 519
Functional Tests
Amplitude Accuracy at 50 MHz
Testing Preamp Option (P08, P13, P26)
Instruments containing Option P08, P13, P26 must have the preamp function
turned on and tested.
Procedure
1. On the analyzer, press AMPTD Y Scale, More, Internal Preamp, Low Band.
2. Connect the equipment as shown in Figure 17-4 on page 517, using a
30 dB pad between the adaptor and the signal analyzer input.
3. Set the synthesized sweeper amplitude to the value listed in the Nominal
Source Amplitude column in Table 17-5.
4. Set the signal analyzer input attenuation to 0 dB.
5. Set the Span as listed in Table 17-5.
6. Record the synthesized sweeper amplitude, as measured by the power
meter, in the Power Meter Amplitude column of Table 17-5.
7. On the signal analyzer, press Restart.
8. Wait for the analyzer to finish averaging.
9. Press Peak Search.
10.Record the signal amplitude as measured by the analyzer in the measured
amplitude column of Table 17-5.
11.Calculate the signal amplitude accuracy using the following equation:
Amplitude Accuracy Error = Meas_amp + 30 dB - Power_meter
12.Record the results under the Amplitude Accuracy Error column of Table
17-5.
Table 17-5 Amplitude Accuracy Results (Option P08, P13, P26)
Nominal
Source
Amplitude
(dBm)
Low-
band
Preamp
Res BW
(kHz)
Span
(kHz)
Measured
Amplitude
Meas_amp
(dBm)
Power Meter
Amplitude
Power_meter
(dBm)
Amplitude
Accuracy
Error
(dB)
Test Limit
(dB)
-13 ON 1 106 ±1.30 dB
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