HP 8559A OFF, div, 1 MHz, 100 MC, Full clockwise, Comb Generator:, OUTPUT AMPLITUDE, OUTPUT AMPLITUDE, COMB FREQUENCY- MHz, INTERPOLATION AMPLITUDE

MODEL 8559A	PERFORMANCETESTS
PERFORMANCE TESTS
4-13. RESIDUAL FM (Cont'd)
Comb Generator:
COMB FREQUENCY- MHz ...............................................	100 MC
INTERPOLATION AMPLITUDE - 1 MHz ......................................	OFF
OUTPUT AMPLITUDE ..............................................	Full clockwise

2.Connect OUTPUT of comb generator to spectrum analyzer INPUT 50Qas shown in Figure 4-5.

NOTE

The 8559A is sensitive to vibration. Be sure spectrum analyzer is in a vibration-free environment.

3.Adjust spectrum analyzer TUNING control to display 3.0 GHz signal produced by comb generator. Adjust REFERENCE LEVEL and REF LEVEL FINE controls to position peak of signal at top graticule line.

4.Keep 3.0 GHz signal centered on CRT with TUNING control while reducing FREQ SPAN/DIV to zero.

5.Set RESOLUTION BW to 10 kHz and SWEEP TIME/DIV to 0.1 sec.

6 . Slightly readjust spectrum analyzer FINE TUNING control until trace appears between fourth and seventh graticule lines. Peak-to-peak variation of trace should not exceed 1.4 vertical division for each horizontal division (see Figure 4-7).

div

NOTE

For 2201240 line voltages, peak-to-peak variation of trace should not exceed 1.4 verticaldivisions(2 kHz) in a 180-series display mainframe.

AMPLITUDE

VARIATION OF

I F SIGNAL

FREQUENCY VARIATION

OF I F SIGNAL

FIGURE44. RESIDUALFM TO AM CONVERSIONDISPLAY FIGURE4-7. RESIDUAL FMDISPLAY