Figure 1. Modulation meter

Calibration Procedure For Modulation Meters Me-57/U And Me-57A/U Page Navigation
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TB 9-6625-2004-35

9. Input Sensitivity

a. Performance Check

(1) Set FREQUENCY RANGE-MC switch to 250-500 and adjust FREQUENCY-

MC dial to 400.

(2) Set synthesized signal generator frequency to 400 MHz and level to 5 mV.

(3) Adjust TUNING control for maximum indication on LIMITING meter while

maintaining 5 mV level. If LIMITING meter pointer is not within the black area, perform

b below.

b. Adjustments. Adjust LIMITING ADJ R51 (fig. 1) until TI LIMITING meter

pointer is at beginning edge of black area (R).

Figure 1. Modulation meter - top view.