Dc/Ac Voltage Measurement; Dc/Ac Current Measurement; Resistance Measurement - RIDGID micro CM-100 Mode D'emploi

DC/AC Voltage Measurement

NOTI E Do not measure voltage if motor (or other high current equipment) on the cir-
cuit is being switched ON and OFF. Large voltage surge may occur that can damage the
meter.
1. Set the function switch to
Voltage.
2. Press button to select the AC voltage range if desired.
Ω CAP TEMP Hz" terminal.
3. Insert black test lead plug into the "COM" terminal and red test lead plug into the "V
4. Touch the test probe tips to the circuit under test. Be sure to observe the correct po-
larity (red lead to positive, black lead to negative).
The probe tips may not be long enough to contact the live parts inside some fixtures
because the contacts are deeply recessed. The reading may show 0 volts when the
outlet actually has voltage on it. Make sure the probe tips are touching metal con-
tacts before assuming that no voltage is present
5. Read the voltage in the display. The display will indicate the proper value with deci-
mal point and symbol (DC/AC and V). If the polarity is reversed, the display will show
minus (-) before the value.

DC/AC Current Measurement

To reduce risk of electric shock, ensure that the test leads are discon-
WARNING
nected from the meter before making current measurements.
1. Set the function switch to
urement range. The meter automatically defaults to DC current.
2. Press button to select the AC current range from default DC mode.
3. In DC mode, press the
once, the
cating the display is zero.
4. Press the trigger to open up the trans-
former jaws and clamp around the
single conductor that needs to be
tested.
5. Read the display. The display will in-
dicate the proper value with decimal
point and symbol.
NOTE! During measurement, keep the
jaws fully closed for accurate meas-
urement. When measuring large
currents, the jaws may buzz. This is
not a fault and does not affect the
accuracy.

Resistance Measurement

To reduce risk of electric shock, disconnect all power (remove batteries,
WARNING
unplug cord, discharge all capacitors, etc.) to the circuit being measured before taking any
resistance measurement.
12
micro CM-100 Digital Clamp Meter
symbol will appear indi-
position. The meter automatically defaults to DC
, or
button
Correct Current
Measurement
Figure 8 – Correct Way of Current Measurement
position according to the meas-
Incorrect Current
Measurement