HP 3585A Service Manual page 89

Performance Tests
4·28. Fractional N API Spur Test
This test checks that the Fractional N API circuitry is operating properly by checking the
spurious response level.
Specification:
Equipment Required:
Procedure:
a. Set the 3585A controls for:
b. Set the synthesizer controls for:
c. Connect the 500 output of the synthesizer to the 500 input of the 3585A.
d. Allow one complete sweep to occur.
e. All points on the display should read less than -80 dB, verifying that the 3585A passes
this Fractional N API Spur test.
4·29. Tracking Generator Flatness Test
This test compares the output of the calibrator to the output of the Tracking Generator. Any
un flatness contributed by the input section is subtracted out.
Specification:
Tracking Generator Frequency Response ± 0.7 dB
4-30
<
Spurious Responses -80 dB below signal
FREQUENCY SYNTHESIZER . . . . . . -hp- 3335A
INSTRUMENT PRESET
CENTER FREQUENCY . . . . . . . . . 37,650,055 Hz
FREQUENCY SPAN . . . . . . . . . . . . . . . . . . . 200 Hz
REFERENCE LEVEL . . . . . . . . . . . . . . . . . -30 dBm
RANGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 dBm
VIDEO BW . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Hz
FREQUENCY . . . . . . . . . . . . . . . . . . 37,648,955 Hz
AMPLITUDE . . . . . . . . . . . . . . . . . . . . . . + 10 dBm
Model 3585A