TB 9-6625-2043-24
b. Adjustments
(1) Adjust function/arbitrary generator output for an indication of 7.07 mV on true
rms voltmeter.
(2) Adjust R523 (fig. 1 or 2) for a 10.0 V dc indication on multimeter (R).
12. Meter Sensitivity
a. Performance Check
(1) Zero TI meter as described in paragraph 7 h above.
(2) Set FULL SCALE switch to -30 dBm.
(3) Adjust function/arbitrary generator output for a TI meter indication of -30 dBm
(1.000 W). If true rms voltmeter does not indicate between -29.65 and -30.35 dBm,
perform b below.
(4) Repeat technique of (1) through (3) above for values listed in table 3. If true rms
voltmeter does not indicate within limits specified, perform corresponding adjustments.
Table 3. Meter Sensitivity
True rms voltmeter
Test instrument
indications (dBm)
Adjustments (R)
FULL SCALE
Adjust for
switch positions
Meter
indications
(dBm)
indications
Min
Max
(figs 1 and 2)
(dBm)
-50
-50 dBm
-49.55
-50.45
R525
-50
(10.00 nW)
-40
-40 dBm
-39.6
-40.4
R524
-40
(100.0 nW)
-20
-20 dBm
-19.7
-20.3
R522
-20
(10.00 W)
-10
-10 dBm
-9.75
-10.25
R521
-10
(100.0 W)
-10
-20 dBm
-19.75
-20.25
R543
-20
(10.0 W)
0
0 dBm
-0.2
+0.2
R520
0
(1.000 mW)
0
-10 dBm
-9.8
-10.2
R548
-10
(.100 mW)
+10
+10 dBm
+9.75
+10.25
R519
+10
(10.00 mW)
+10
0 dBm
-0.25
+0.25
R562
0
(1.00 mW)
b. Adjustments
(1) Adjust function/arbitrary generator output for an indication of -30.00 dBm on
true rms voltmeter.
meter (R).