Table 6. Scan Time Accuracy

Figure 5. Scan time accuracy - equipment setup.

Calibration Procedure For Spectrum Analyzer, If, Lf, And Rf Plug-In Units, Models 8552, 8553, 8554, 8555, And 8556 Page Navigation
18

TB 9-6625-1914-24

(g) SCAN TRIGGER switch to VIDEO.

(4) Adjust signal generator for output of 30 MHz at -30 dBm.

(5) Set signal generator controls as necessary for external modulation.

(6) Adjust function generator no. 1 controls to provide 90 percent modulation of

signal generator at 1 kHz.

(7) Fine tune signal generator frequency controls for best display.

(8) Adjust LINEAR SENSITIVITY (LOG REF LEVEL vernier) vernier control for

a convenient display height.

(9) Adjust DISPLAY ADJUST HORIZONTAL POSITION control to position first

modulation peak directly on -5 graticule line (left of centerline).

(10) Adjust function generator no. 1 frequency controls to align 10th modulation peak

with +4 graticule line. If function generator no. 1 frequency is not between .89 and 1.11

kHz, perform b below.

(11) Repeat technique of (4) through (10) above, using SCAN TIME PER DIVISION

switch settings listed in table 6. If function generator no. 1 indication is not within limits

specified, perform b below.

Table 6. Scan Time Accuracy

Test instrument

Function generator no. 1 frequency indications

SCAN TIME PER

DIVISION switch

Min

Max

settings

0.1 ms

kHz

0.2 ms

4.5

kHz

5.5

kHz

0.5 ms

1.8

kHz

2.2

kHz

0.9

kHz

1.1

kHz

450

550

180

220

110

0.1 s

0.2 s

b. Adjustments

(1) Connect TI and RF plug-in to extender and connect extender (supplied with TI)

to display section.

(2) Adjust function generator no. 1 frequency to 1 kHz and adjust A6R12 SCAN

TIME (fig. 3) or A6R15 SCAN TIME (fig. 2) to align 10th modulation peak with +4 graticule

line (R).

(3) Readjust A6R12 SCAN TIME or A6R15 SCAN TIME as necessary for best

compromise at all SCAN TIME PER DIVISION switch settings.

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