Keysight NFA Series Noise Figure Analyzers Service Guide 511
Functional Tests
Frequency Response (Flatness), Preamp On
2. Configure the equipment as shown in Figure 17-6.
3. Assure the signal analyzer’s built-in auto alignment has been performed
within the last 24 hours.
4. Press MODE/MEAS on the analyzer. Select the Spectrum Analyzer mode,
Swept SA measurement, and Normal view. Press OK. Press Mode Preset.
Press Preset on the synthesized sweeper.
5. Set up the synthesized sweeper by pressing:
CW, 50, MHz
Power level, –54, dBm
6. Set up the signal analyzer by pressing:
Input/Output, Freq Ref Input, Freq Ref Input External
FREQ, Center Frequency, 50, MHz
Span, 50, kHz
AMPTD, Signal Path, Internal Preamp, Full Range
AMPTD, Attenuation, Mech Atten, 0, dB
AMPTD, Y Scale, Ref Level, –55, dBm
7. Adjust the synthesized sweeper output power for a power meter reading
of –60 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 17-8, “Frequency Response (Flatness) Results.” Enter the
amplitude of the signal displayed on the signal analyzer into the Meas
Amp
column of Table 17-8.
11.Enter the power meter reading into the Power
Meter
column of Table 17-8.
12.Tune the synthesized sweeper and signal analyzer to the next frequency
listed in Table 17-8.
13.Enter the power sensor calibration factor into the power meter.
14.For frequencies 3.6 GHz and above, press AMPTD, Signal Path, 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 17-8
for the frequency range of your preamp.
16.Compute the measurement error (Meas
Error
= Meas
Amp
- Power
Meter
).
Connect the power splitter to the signal analyzer input using the
appropriate adapter. Do not use a cable.
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