Dc/Ac Current Measurement; Resistance Measurement - RIDGID micro DM-100 Manual

1. Set the function switch to the V DC/AC (
select AC or DC.
2. Insert the black test lead plug into the "COM" terminal and the red test lead plug into
the "V" terminal.
3. Touch the test probe tips to the circuit under test. Be sure to observe the correct polar-
ity (red lead to positive, black lead to negative). Range switching and DC/AC selection
are automatic.
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 contacts
before assuming that no voltage is present.
4. Read the voltage in the display. The display will indicate the proper value with decimal
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, do not measure AC current on any circuit
WARNING
whose voltage exceeds 250V AC. When measuring current, turn off the circuit power before
connecting the meter in series with the circuit. Improper set up could result in electrical
shock.
1. For current measurement up to 4000 µA, set the function switch to the µA (
position and insert the red test lead plug into the "µA / mA" terminal.
2. For current measurement up to 400 mA, set the function switch to the mA (
range and insert the red test lead plug into the "µA / mA" terminal.
3. For current measurement up to 10 A, set the function switch to the A (
and insert the red test lead plug into the "10 A" terminal.
4. Press MODE button to select DC or AC.
5. Insert the black test lead plug into the "COM" terminal.
6. Remove power from the circuit under test, then open up the circuit at the point where
you wish to measure current.
7. Touch the black test probe tip to the negative side of the circuit. Touch the red test
probe tip to the positive side of the circuit.
Do not make current measurement on the 10 A scale for longer than 30 seconds.
NOTICE
Exceeding 30 seconds may cause damage to the meter and/or the test leads.
8. Apply power to the circuit.
9. Read the current in the display. The display will indicate the proper value with decimal
point and symbol.

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.
1. Set the function switch to Ω position.
micro DM-100 Digital Multimeter
) position and use the MODE button to
)
)
) position
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