HP 8559A OUTPUT AMPLITUDE, COMB FREQUENCY - MHz, INTERPOLATION AMPLITUDE - 1 MHz, (30, 4-14.NOISE SIDEBANDS(Cont'd)

MODEL8559A	PERFORMANCE TESTS
PERFORMANCE TESTS
4-14. NOISE SIDEBANDS(Cont'd)
Comb Generator:
COMB FREQUENCY - MHz ...............................................	100 MC
INTERPOLATION AMPLITUDE - 1 MHz ......................................	OFF
OUTPUT AMPLITUDE ..............................................	Full clockwise
Connect equipment as shown in Figure 4-8.
Adjust TUNING control to locate 1.8-GHz comb tooth on CRT

Adjust REFERENCE LEVEL and REF LEVEL FINE controls to position peak of 1.8-GHz signal at top graticule line.

Decrease FREQ SPAN/DIV to 20 kHz and RESOLUTION BW to 1 kHz. Adjust TUNING as necessary to keep signal centered.

Position signal at center of display. Set VIDEO FILTER control fully clockwise (not in MAX detent position). Measure noise sidebands existing more than 1.5 divisions (30 kHz) from 1.8-GHz signal. Noise sidebands should be more than 70 dB (7 divisions) down from top graticule line.

div. down