Model 380353 V1.4 02/05
6
Megohm Measurements
1.
Disconnect all power from the circuit to be tested.
2.
Set the FUNCTION switch to the desired test range
3.
Connect the alligator clips to the circuit to be tested
CAUTION
: If the
LIVE CIRCUIT
indicator lights up at this point,
DO NOT
operate the test
button. Remove the alligator clips and disconnect all power from the circuit.
4.
Press and hold the
PRESS TO TEST
button to make the measurement. Turn the
button ¼ turn to the right to lock the test on.
5.
Read the value on the
M
Ω
scale and apply the range multiplier to determine the
Megohm resistance reading.
6.
Release the PRESS TO TEST button and allow the device to discharge before
removing the alligator clips.
Range Reading
Multiplier
250V 0.5
500V 1
1000V 2
Low Resistance (Continuity) Measurements
WARNING:
Do not run this test unless the voltage on the device under test is zero. If the
Live Circuit status LED lights when a test is initiated, immediately abort the test and check
that the circuit under test is not powered.
1. Set the Function select switch to the Resistance (
Ω
) position.
2. Connect the red test lead to the LINE input and the black lead to the EARTH input.
3. Perform a zero adjustment using the zero adjust screw on the display as described
above.
4. Connect the test lead tips to the circuit under test and read the resistance on the
green display scale. The maximum resistance is 50
Ω.
The main application for low resistance tests is the identification of low
Ω
circuits such as
motor runs and start windings which may differ by only a few ohms. With a mid-scale
reading of 2
Ω
, this test mode can also be used to check relay contact resistance.
AC Voltage Measurements
1.
Set the Function select switch to the red ACV 600V position.
2.
Connect the red test lead to the LINE input and the black test lead to EARTH.
3.
Connect the test lead tips to the circuit under test.
4.
Read the voltage value on the red display scale.
