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106 Chapter 3
PSA Functional Tests
Amplitude Accuracy at 50 MHz
PSA Functional Tests
Testing Option 1DS (Preamp)
Instruments containing Option 1DS must have the preamp function turned on and tested.
In order to enable this function, press
Amplitude, More 1 of 3, Int Preamp (On).
Procedure
1. Connect the 20 dB pad between the input of the spectrum analyzer and the power
splitter, as shown in Figure 3-1..
2. Set the synthesized sweeper amplitude to the value listed in the Nominal Source
Amplitude column in Table 3-2.
3. Assure the spectrum analyzer input attenuation is set to 10 dB.
4. Set the Res BW and Span as listed in Table 3-2.
5. Record the source amplitude, as measured by the power meter, in the Power Meter
Amplitude column of Table 3-2.
6. On the spectrum analyzer, press
Restart, Peak Search.
7. Wait for the analyzer to finish averaging.
8. Record the signal amplitude as measured by the analyzer in the measured amplitude
column of Table 3-2.
9. Calculate the signal amplitude accuracy using the following equation:
Amplitude Accuracy Error
= Meas_amp + 20 dB − Corrected Power Value
10.Record the results under the Amplitude Accuracy Error column of Table 3-2.
Table 3-2 Amplitude Accuracy Results (Option 1DS)
Nominal
Source
Amplitude
(dBm)
Preamp
(Option
1DS)
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 1.2