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Ridgid 37428 [14/427] Dc ac current measurement

micro CM-100 Digital Clamp Meter

DC/AC Voltage Measurement

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 position. The meter automatically defaults to DC

Voltage.

2. Press button to select the AC voltage range if desired.

3. Insert black test lead plug into the “COM” terminal and red test lead plug into the “V

Ω CAP TEMP Hz” terminal.

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-

nected from the meter before making current measurements.

1. Set the function switch to , or position according to the meas-

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 button

once, the ∆ symbol will appear indi-

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,

unplug cord, discharge all capacitors, etc.) to the circuit being measured before taking any

resistance measurement.

NOTICE

WARNING

Correct Current

Measurement

Incorrect Current

Measurement

Figure 8 – Correct Way of Current Measurement

WARNING

Ridgid 37428 [14/427] Dc ac current measurement

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