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Figure 1. AN/URM-145C.
Figure 2. Frequency response - equipment setup.

Calibration Procedure For Electronic Voltmeter An/Urm-145B And An/Urm-145C (Me-247C/U) Page Navigation
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TB 9-6625-2289-24
NOTE
If necessary, repeat 7 g through i above.
(24) Connect RF probe to calibrator WIDEBAND OUTPUT.
(25) Adjust calibrator for 3 mV ac output and then adjust R6 (fig. 1) for a TI
indication between .0027 and .0033 V ac (ideal .003 V ac) (R).
(26) Set RANGE switch to .1-VOLTS. Adjust calibrator for .10 V ac output and then
adjust R19 (fig. 1) for a TI indication between .09 and 0.11 V ac (ideal .1 V ac) (R).
(27) Set RANGE switch to .3 VOLTS. Adjust calibrator for .3 V ac output and then
adjust R21 (fig. 1) for a TI indication between .27 and .33 V ac (ideal .3 V ac) (R).
(28) Set RANGE switch to .01 VOLTS. Adjust calibrator for .01 V ac output and
then adjust R10 (fig. 1) for a TI indication between .009 and .011 V ac (ideal .01 V ac) (R).
(29) Set RANGE switch to .03 VOLTS. Adjust calibrator for .03 V ac output and
then adjust R14 (fig. 1) for a TI indication between .027 and .033 V ac (ideal .030 V ac) (R).
(30) Set RANGE switch to 1 VOLTS. Adjust calibrator for 1 V ac output and then
adjust R23 (fig. 1) for a TI indication between .9 and 1.1 V ac (ideal 1.0 V ac) (R).
(31) Set RANGE switch to 3 VOLTS. Adjust calibrator for 3.0 V ac output and then
adjust R25 (fig. 1) for a TI indication between 2.7 and 3.3 V ac (ideal 3.00 V ac) (R).
9. Frequency Response
a. Performance Test
(1) C o n n e c t c a l i b r a t o r W I D E B A N D O U T P U T ( w i t h o u t 5 0 o h m p a d ) t o T I
R F probe using 50  feed through termination supplied with TI.
(2) Set RANGE-FULL SCALE SWITCH to .1 VOLTS.
(3) Adjust calibrator frequency controls to values listed in table 4.
(4) Adjust calibrator output voltage controls for .1 V indication on TI meter.
Calibrator voltage output will be within the limits specified in table 4.
(5) Repeat (3) and (4) above for remaining calibrator frequency settings listed in
table 4.
Table 4. Frequency Response
Calibrator
Calibrator output voltage
frequency
indications
settings
(mV)
(kHz)
Min
Max
20
90
110
50
90
110
100
90
110
500
90
110
1000
90
110
(6) Connect equipment as shown in figure 2.
7


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