Table 5. Frequency Accuracy

Span Width and Frequency Accuracy

Figure 9. A7 frequency control - adjustment locations.

Calibration Procedure For Spectrum Analyzer Model 8558B Page Navigation
16

TB 9-6625-2235-24

Table 5. Frequency Accuracy - Continued

Test instrument

FREQUENCY

FREQ SPAN/DIV

Synthesizer/level generator

MHz

switch

or signal generator frequency

readout

(MHz)

settings

Min

Max

100

200

kHz

98.96

101.04

140

200

kHz

138.96

141.04

180

200

kHz

178.96

181.04

200

MHz

194.8

205.2

400

MHz

394.8

405.2

600

MHz

594.8

605.2

800

MHz

794.8

805.2

1000

MHz

994.8

1005.2

1200

MHz

1194.8

1205.2

1400

MHz

1394.8

1405.2

1500

MHz

1494.8

1505.2

1Replace

synthesizer/level generator with signal generator.

b. Adjustments

(1) Connect multimeter to A7TP7 (fig. 9) and chassis ground. Adjust A7R5 (fig. 9)

for a multimeter indication between 14.48 and 14.52 V dc (R).

(2) Disconnect multimeter from A7TP7 (fig. 9) and connect to A7TP6 (fig. 9) and

adjust A7R4 (fig. 9) for a multimeter indication between 5.99 and 6.01 V dc (R).

(3) Set FREQ SPAN/DIV switch to 5 MHz and RESOLUTION BW switch to 100 kHz.

(4) Turn FREQUENCY ZERO control fully ccw.

(5) Adjust TUNING control for FREQUENCY MHz readout of approximately -16.0.

(6) Press FREQUENCY CAL pushbutton and adjust A7R3 (fig. 9) to center LO

feedthrough (within 1 division) on crt (R).

NOTE

Press FREQUENCY CAL pushbutton whenever TUNING

control is adjusted.

Disconnect comb generator, when

necessary, to center LO feedthrough.

(7) Position controls as listed in (a) through (d) below:

(a) FREQ SPAN/DIV switch in to couple position.

(b) RESOLUTION BW switch in to couple position.

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