|
| |
TM 9-2320-360-20-1
(b)
Set the function/range switch to the desired ohm position. If the magnitude of the resistance is not
known, set the switch to the highest range, then reduce until a satisfactory reading is obtained.
(c)
If the resistance being measured is connected to a circuit, turn ENGINE switch OFF.
(d)
Connect test leads to the circuit being measured. When measuring high resistance, be careful not to
contact adjacent points, even if they are insulated. Some insulators have a relatively low insulation
resistance which can affect the resulting measurement.
(e)
Read the resistance value on the digital display.
(2)
Continuity Checks
(a)
Place the function/range switch in any ohm range.
NOTE
Some meters show '1+m ', or simply '1' when function/range switch in any ohm
position.
(b)
Connect the red lead to the volt-ohm connector and black lead to COM input connector on the meter.
With the test leads separated or measuring an out-of-range resistance, the digital display will indicate
'OL' (overlimit).
(c)
Put one test lead probe at one end of the wire or circuit to be tested. Use the other test lead to trace
the circuit. When continuity is established, an ohm symbol will appear in the upper left corner of the
digital display. If contact in the wire is maintained long enough (about 1/4 of a second), the OL will
disappear and the resistance value of the wire or circuit will appear next to the symbol.
(3)
Voltage Measurements
(a)
Connect the red test lead to the volt-ohm input connector and the black lead to the COM input on the
meter. If a DC-AC switch is present, make sure it is switched to the DC position.
(b)
Set the function/range switch to the desired volts position. If the magnitude of the voltage is not
known, set the switch to highest DC voltage range (50VDC). Then reduce the range until a
satisfactory reading is obtained.
(c)
Connect the test leads to the circuit being measured. Voltage measurements are always taken at
pins, sockets, Battery + or ground. Following the voltage measurement point, the color test lead used
is given in parenthesis (red is volt-ohm connection, and black is the COM connection).
2-65
|
