HP 8559A Operation And Service Manual page 65

MODEL 8559A
4-18. RESIDUAL RESPONSES (Cont'd)
Terminate INPUT 5(M2 connector with 50-ohm termination.
Adjust TUNING control to position LO feedthrough signal on leftmost vertical graticule line.
Set RESOLUTION BW control to 10 kHz, leaving FREQ SPAN/DIV set to 10 MHz. Adjust BL CLIP
control clockwise until just the peaks of the noise are displayed. Set the SWEEP TRIGGER control to
SINGLE and display PERSISTENCE control to MAX.
Set display to WRITE and momentarily press ERASE. Turn SWEEP TRIGGER control clockwise to
trigger a single sweep, adjusting BL CLIP and display INTENSITY controls until just the peaks of the
noise are displayed. Press ERASE and trigger another sweep.
Set display to VIEW and check for residual responses greater than -90 dBm. Record frequency and
amplitude of residual response with the greatest amplitude.
Residual responses are often visible within 10 MHz of the HP 8559A LO
feedthrough signal (25 MHz with ALT IF selected). These residual responses
are not within the instrument's specified frequency range and should be
excluded from consideration in this performance test.
7. Increase TUNING control setting in 100-MHz increments and use procedure of steps 5
residual responses from 10 MHz to 3.060 GHz (25 MHz
PERFORMANCE TESTS
NOTE
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PERFORMANCE TESTS
7 to check for
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