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Frequency Accuracy - Continued
Figure 8. 1st LO Balance and Span Adjustment and Test Points.

Calibration Procedure For Spectrum Analyzer An/Usm-489(V)1 (Type 492 W/Options 01, 02, 03, 08, And 21) Page Navigation
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TB 9-6625-2134-24
Figure 7. Sweep Timing - Equipment Setup.
(76) Adjust R5105 (fig. 1) for 1 marker per division. (Use POSITION controls if
needed to aline markers.) Remove TI from equipment setup.
NOTE
If POSITION control was used in (76) above, press TI FREE
RUN TRIGGERING pushbutton to on, set TIME/DIV switch
to MNL, and adjust FREQUENCY SPAN/DIV control to
MAX.  Adjust POSITION controls to aline dot with bottom
and center graticule lines. Press DIGITAL STORAGE VIEW
A & B off and VERTICAL DISPLAY 2 dB/DIV pushbutton
to on.
(77) Press FREQUENCY RANGE pushbutton to 0 to 1.8 GHz and press
EXTERNAL MIXER pushbutton to on.
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