TB 9-6625-2287-24
Table 3. Range Accuracy and Linearity - Continued
RANGE-FULL-
Test instrument meter
SCALE VOLTS
indications
Calibrator indications
scale setting
(V)
Min
Max
0.01
0.003
2.5
mV
11.5
mV
5.5
mV
21.5
mV
0.006
8.5
mV
31.5
mV
0.009
0.03
0.01
8.5
mV
11.5
mV
18.5
mV
21.5
mV
0.02
28.5
mV
31.5
mV
0.03
0.1
0.03
25.0
mV
35.0
mV
0.06
55.0
mV
65.0
mV
0.09
85.0
mV
95.0
mV
0.3
0.1
85.0
mV
115.0
mV
0.2
185.0
mV
215.0
mV
0.3
0.285 V
0.315 V
1
0.3
0.250 V
0.350 V
0.6
0.550 V
0.650 V
0.9
0.850 V
0.950 V
0.850 V
1.15
V
3
1
2
1.85
V
2.15
V
3
2.85
V
3.15
V
b. Adjustments. Perform (1) through (12) below for AN/URM-145 (ME-247/U).
Perform (23) through (33) below for AN/URM-145A (ME-247A/U) with serial number 2661
and above.
NOTE
Adjustment numbers 1 through 6 are located from front to rear
on right side of TI cabinet.
NOTE
Calibrator operating frequency is 300 kHz.
NOTE
Ensure RF probe is connected to calibrator WIDEBAND
OUTPUT before proceeding to (1) below.
(1) Set RANGE-FULL-SCALE switch to 1-VOLTS. Adjust calibrator for 0.3 V ac
output at 300 kHz and then adjust adjustment number 1 for TI meter indication between
0.25 and 0.35 (ideal 0.3 V ac).
(2) Adjust calibrator for 0.9 V ac output at 300 kHz and then adjust adjustment
number 2 for TI meter indication between 0.85 and 0.95 (ideal 0.9 V ac).
(3) Set RANGE-FULL-SCALE switch to 3-VOLTS. Adjust calibrator for 2.5 V ac
output and then adjust adjustment number 3 for a TI indication between 2.35 and 2.65 V ac
(ideal 2.5 V ac) (R).
(4) Set RANGE-FULL-SCALE switch to .3-VOLTS. Adjust calibrator for 0.25 V
ac output and then adjust adjustment number 4 for a TI indication between 0.235 and 0.265 V
ac (ideal 0.25 V ac) (R).
5
