Fluke 9640A Series, Instruction Manual

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9640A
Instruction Manual
5-14
5. On the signal source analyzer, press the PREMEAS soft key to initiate a pre-
measurement. This allows the analyzer to automatically tune to the input and select
the appropriate measurement configuration .
6. When the pre-measurement is complete, press the RUN soft key to make the phase
noise measurement.
Note
The signal source analyzer will default to using a cross-correlation
measurement, thus, providing the optimum phase noise measurement.
7. Press MARKER on the signal source analyzer to place the marker at the lowest offset
frequency of 100Hz.
8. Observing the marker data on the display of the signal source analyzer, verify the
phase noise at a 100 Hz offset is
≤ -103 dBc/Hz.
9. Use the up (

) and down (

) keys on the signal source analyzer to move the marker
across the phase-noise plot on the display to each of the offset frequencies listed in
Table 5-6. At each offset frequency, observe the marker data on the display of the
signal source analyzer and verify the phase noise is within the limit shown in Table
5-6.
10. Set the UUT output to
STBY
. Remove all connections to the Leveling Head.
Table 5-6. Phase Noise Test (9640A-LPN only)
Level Output Frequency Offset frequency Tolerance
100 Hz < -101 dBc/Hz
1 kHz < -125 dBc/Hz
10 kHz < -134 dBc/Hz
100 kHz < -134 dBc/Hz
+13 dBm 1 GHz
1 MHz < -148 dBc/Hz
10 MHz < -151 dBc/Hz
Modulation Test (Optional)
Equipment required for this test:
•
Spectrum Analyzer/Measuring Receiver
•
50
Ω
Leveling Head (supplied with UUT)
Use the following procedure to verify the amplitude and frequency modulated outputs of
the UUT:
Note
Verification of phase modulation is not required as phase modulation is
created as sinusoidal frequency modulation with peak deviation derived
from the phase deviation and rate settings.
1. Connect the output of the 50
Ω
Leveling Head to the RF INPUT of the measuring
receiver.
2. On the Spectrum Analyzer/Measuring Receiver press PRESET and then select
Measuring Receiver Mode.