HP 8642A - Page 290

Performance Tests
EQUIPMENT:
PROCEDURE:
4-40
PERFORMANCE TESTS
NOTE
This test is a good overall check of the phase noise
performance of the HP 8642. However, if it is
necessary to check phase noise at a specific output
frequency, perform test 4-! 6 or use an H P Phase
Noise Measurment System to verify the performance.
Model 8642A/B
Mixer ............................ HP 10514A
1 MHz Low Pass Filter .......... (See Figure 1- I)
Low-Noise Amplifier ............ HP 08640-60506
W /Power Supply HP 6216A
Spectrum Analyzer ............... HP 8566A/B
Oscilloscope ......................... HP 1 98 OB
1.
Connect the instruments as shown in Figure 4-11. Preset the
instruments. Insure that the spectrum analyzer center frequency
calibration is accruate.
2. On the HP 8642, enter SPCL 8. Set the HP 8642 to 10.020 MHz and
-50 dBm amplitude.
3. Set up the Spectrum Analyzer as follows:
4.
VIDEO BW
SWEEP TIME
A TTENUA TION
RESOLUTION
CENTER FREQ.
SPAN
REFERENCE LEVEL
1Hz
5.0 sec
o dB
10 Hz
20 kHz
o Hz
-50 dBm
NOTE
It may be necessary to fine tune the spectrum analyzer
center frequency adjustment. The spectrum analyzer
band width will be centered when the maximum signal
level is obtained while tuning the center frequency
adjustment.
Record the level of the 20 kHz peak signal for later use.