N9030B PXA Signal Analyzer Service Guide 591
Functional Tests
Frequency Response (Flatness)
4. Press Mode, Spectrum Analyzer, Mode Preset on the signal analyzer, and
press Preset on the synthesized sweeper.
5. Set up the synthesized sweeper by pressing:
CW, 50, MHz
Power level, –4, dBm
6. Set up the signal analyzer by pressing:
Input/Output, More, Freq Ref In, External
FREQ Channel, Center Freq, 50, MHz
SPAN X Scale, Span, 50, kHz
AMPTD Y Scale, Ref Level, 0, dBm
7. Adjust the synthesized sweeper output power for a power meter reading
of –10 dBm ±0.1 dB.
8. On the signal analyzer, press Single.
9. Press the Peak Search key on the signal analyzer to position the marker on
the peak of the signal.
10.Refer to Table 18-7, “Frequency Response (Flatness) Results.” Enter the
amplitude of the signal displayed on the signal analyzer into the Meas
Amp
column of Table 18-7.
11.Enter the power meter reading into the Power
Meter
column of Table 18-7.
12.Tune the synthesized sweeper and signal analyzer to the next frequency
listed in Table 18-7.
13.Enter the power sensor calibration factor into the power meter.
14.For frequencies 3.6 GHz and above, press AMPTD Y Scale, then Presel
Center to center the preselector filter for an optimum amplitude
measurement.
15.Repeat step 7 through step 14 and complete the remainder of Table 18-7
for the frequency range of your analyzer.
16.Compute the measurement error (Meas
Error
= Meas
Amp
- Power
Meter
).
17.Compute the flatness error normalized to 50 MHz:
(Meas
Error
- Meas
Error
@ 50 MHz)
18.Enter the computed flatness error value into the Flat
Norm
column of Table
18-7.
19.Compare the value of Flat
Norm
to the test limit.
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