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Frequency Display
Table 4. Frequency Span

Calibration Procedure For Selective Voltmeter Model 3581C Page Navigation
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TB 9-6625-2143-24
(2) Connect rear panel OUTPUT to front panel INPUT.
(3) Adjust A2C4 (fig. 1) for peak meter indication. (R)
(4) Disconnect cable connected in (2) above.
(5) Set INPUT SENSITIVITY and VERNIER controls to CAL, RESOLUTION
BANDWIDTH control to 10 Hz, and SWEEP MODE control to OFF.
(6) Adjust FREQUENCY control for exactly 10,000 Hz indication on TI display.
Press AFC pushbutton.
(7) Connect multimeter to A3TP7 (fig. 1) and chassis ground and adjust A3R1 (fig. 1)
for multimeter indication of 0 0.5 V dc. (R)
Figure 1. Adjustments.
9. Frequency Span
a. Performance Check
(1) Position controls as listed in (a) through (n) below:
6


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