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Table 5B. Transmitter Level and Flatness
Final Procedure

Calibration Procedure For Transmission Impairment Measuring Set Model 4945A Page Navigation
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TB 9-6625-2221-24
(e) Press softkey TRMT/RCVR SET UP.
(f) Press softkey TRMT IMP to indicate 135.
(4) Set dc current shunt to 0.1 A range and set calibrator for an output of 48 V. The
multimeter will indicate greater than 20 mV.
(5) Set calibrator output to standby.
(6) Repeat (3) through (5) above for impedances of 600 :, 900 :, and 1200 :.
b. Adjustments. No adjustments can be made.
Multimeter
Test Instrument
DC Current Shunt
Calibrator
Figure 1. Transmitter/receiver hold coil current test.
12. Receiver Hold Coil Current
a. Performance Check
(1) Connect equipment as shown in figure 1 but to RCVR terminals on the TI.
(2) Press softkey RCVR IMP to indicate 135 :.
(3) Set calibrator for an output of 48 V. The multimeter will indicate greater than 20 mV.
NOTE
Set calibrator to standby when changing impedances.
(4) Perform (2) and (3) above for impedances of 600 :, 900 :, and 1200 :.
(5) Position controls as listed in (a) through (d) below:
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