ARMY TM 9-6115-645-24
AIR FORCE TO 35C2-3444 12
MARINE CORPS TM 09244A/09245A-2412
2-28
FREQUENCY METER (HERTZ).
2-28.1. Inspection.
a. Shut down generator set.
b. Inspect meter for broken lens, cracked housing, and other damage.
2-28.2. Testing (50/60 Hz).
NOTE
Test frequency transducer in accordance with paragraph 2-52.2 or 2-52.3 prior to testing
FREQUENCY meter (HERTZ).
a. Shut down generator set.
b. Open battery access door and disconnect negative battery cable.
c. Release control panel by turning two fasteners and lower control panel slowly.
d. Disconnect wire 181 A from positive (+) terminal of FREQUENCY meter (HERTZ).
e. Set multimeter for DC milliamps and connect negative lead to positive (+) terminal of FREQUENCY meter
(HERTZ) and positive lead to wire 181 A.
f.
Position FREQUENCY SELECT switch to 60 Hz.
g. Connect negative battery cable, start and operate generator set at rated voltage and adjust frequency to 60 Hz.
h. Multimeter indication should be between 0.781 and 0.923 DC milliamps.
i.
Position FREQUENCY SELECT switch to 50 Hz and adjust frequency to 50 Hz.
j.
Multimeter indication should be between 0.071 and 0.213 DC milliamps.
k. Replace FREQUENCY meter (HERTZ) if meter readings are not as stated above.
I.
Raise and secure control panel.
2-28.3. Testing (400 Hz).
a. Shut down generator set.
b. Open battery access door and disconnect negative battery cable.
c. Release control panel by turning two fasteners and lower control panel slowly.
d. Disconnect wire 181 A from positive (+) terminal of FREQUENCY meter (HERTZ).
e. Set multimeter for DC milliamps and connect negative lead to positive (+) terminal of FREQUENCY meter
I.
(HERTZ) and positive lead to wire 181 A.
f.
Connect negative battery cable, start and operate generator set at rated voltage and adjust frequency to 400 Hz.
g. Multimeter indication should be between 0.240 and 0.260 DC milliamps.
h. Replace FREQUENCY meter (HERTZ) if multimeter readings are not as stated above.
i.
Raise and secure control panel.
2-58 Change 3
