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Chapter 3 113
PSA Functional Tests
Frequency Response (Flatness)
PSA Functional Tests
6. Set up the spectrum analyzer by pressing:
Frequency, 50, MHz
Span
, 50, kHz
Amplitude
(ref level), –10, dBm
BW/Avg
, Average (On), 10, Enter
7. Adjust the synthesized sweeper output power for a power meter display of –14 dBm
±0.1 dB.
NOTE The power level of the synthesized sweeper remains unchanged for the
duration of the test.
8. Press the
Peak Search key on the signal analyzer to position the marker on the peak of
the signal.
9. Refer to Table 3-5, “Frequency Response (Flatness) Results.” Enter the amplitude of the
signal displayed on the spectrum analyzer into the Meas
Amp
column of Table 3-5.
10.Enter the power meter reading into the Power
Meter
column of Table 3-5.
11.Tune the synthesized sweeper and spectrum analyzer to the next frequency listed in
Table 3-5.
12.Enter the power sensor calibration factor into the power meter.
13.For frequencies 3 GHz and above, press
Amplitude, then Presel Center to center the
preselector filter for an optimum amplitude measurement.
14.Repeat steps 8-13 and complete the remainder of Table 3-5 for the frequency range of
your analyzer.
15.Compute the measurement error (Meas
Error
= Meas
Amp
− Power
Meter
).
16.Compute the flatness error normalized to 50 MHz:
(Meas
Error
− Meas
Error
@ 50 MHz)
17.Enter the computed flatness error value into the Flat
Norm
column of Table 3-5.
18.Compare the value of Flat
Norm
to the test limit.