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 Table3-2.
3. Assure the spectrum analyzer input attenuation is set to 10 dB.
4. Set the Res BW and Span as listed in Table3-2.
5. Record the source amplitude, as measured by the power meter, in the Power Mete r
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 Table3-2.
Table3-2 Amplitude Accuracy Results (Option 1DS)
Nominal
Source
Amplitude
(dBm)
Preamp
(Option
1DS)
Res BW
(kHz)
Span
(kHz)
Measured
Amplitude
Meas_amp
(dBm)
Power M eter
Amplitude
Power_m eter
(dBm)
Amplitude
Accuracy
Error
(dB)
Test Li mit
(dB)
−13 On 1 106 1.2