Keysight Technologies N9030B, Service Manual

Page: 591 / 617

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.