TB 9-6625-388-35
(c) Decade dial 1000 to 1.
(d) Decade dials 100, 10 and 1 to 0.
(e) Mechanically zero galvanometer.
(f) Replace mounting screw removed in paragraph 7d above.
(2) Connect equipment as shown in figure 2.
(3) Adjust decade resistor A (A1) to 1000Ω.
(4) Adjust power supply (A2) for 25-volt dc output as indicated on power supply
(5) Position TI MULTIPLY BY switch and decade dials to settings listed in table 7.
Table 7. Murray Loop Accuracy
Decade B indication
TI MULTIPLY BY
TI DECADE DIALS
switch
settings
(ohms)
positions
(ohms)
Min
Max
M1000
1000
998.5
1001.5
M100
100
998.5
1001.5
M10
10
998.5
1001.5
(6) Depress TI GA SENS .01, .l, and 1 in turn while increasing or decreasing
resistance of decade resistor B (A1) until TI galvanometer pointer indicates 0. Indications
on decade resistor B will be within limits listed in table 7.
b. Adjustments. No adjustments can be made.
11. Final Procedure
a. Deenergize and disconnect all equipment.
b. Insure TI BA switch is in the EXT position and lock the galvanometer.
c. Replace TI cover.
d. In accordance with TM 38-750, annotate and affix DA Label 80 (US Army
Calibration System). When the TI cannot be adjusted with tolerance, annotate and affix
DA Form 2417 (Unserviceable or Limited Use) tag.
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