TM 9-2320-211-20
RESISTANCE TEST
(USED TO MEASURE RESISTANCE OF COILS
OR RESISTORS, AND TO LOCATE SHORT
CIRCUITS)
1. SET SCALE SELECTOR SWITCH ON + DC.
2. SET RANGE SELECTOR SWITCH ON Rx1.
3. TOUCH METER LEADS TOGETHER AND TURN
ZERO OHMS ADJUST UNTIL NEEDLE IS
ON "O" OHMS.
4. MAKE SURE THERE IS NO BATTERY VOLTAGE
CONNECTED TO CIRCUIT TO BE TESTED.
5. ATTACH NEGATIVE LEAD (BLACK) TO COMPONENT
FRAME OR NEGATIVE TERMINAL.
6. TOUCH POSITIVE LEAD (RED) TO OTHER TERMINAL
OF COMPONENT BEING TESTED.
8. IF METER NEEDLE DOES NOT MOVE, CIRCUIT IS
OPEN.
9. IF METER NEEDLE MOVES COMPLETELY ACROSS
SCALE TO "O" A SHORT CIRCUIT EXISTS,
OR A HEAVY-DUTY COMPONENT WITH VERY
LOW RESISTANCE.
AT 27533
CONTINUITY TEST
(U sED To TEST FOR CABLE BREAKS, LOOSE
WIRES, BURNT OUT LAMPS OR OTHER ITEMS)
1. SET SCALE SELECTOR ON +DC.
2. SET RANGE SELECTOR SWITCH ON Rx1.
3. BE SURE THERE IS NO BATTERY VOLTAGE
CONNECTED TO CIRCUIT TO BE TESTED.
4. ATTACH NEGATIVE LEAD (BLACK) TO ONE
END OF CIRCUIT.
5. ToucH POSITlVE LEAD (RED) TO OTHER END
OF CIRCUIT. NEEDLE SHOULD MOVE TO
RIGHT HAND END OF SCALE.
6. IF NEEDLE DOESN'T MOVE, CIRCUIT IS OPEN,
OR LAMP IS BURNT OUT, OR COMPONENT OPEN.
7. IF NEEDLE FLICKERS, OR JUMPS BACK AND
FORTH, LOOSE CONNECTIONS ARE INDICATED.
AT 27534
