Clamp Meter
Basic Measurements
13
L1-L2-L3
Three-phase alternating current (ac) systems are universally used
to distribute electrical power and to supply electricity directly to
high-power equipment. Use the Clamp to make a sequential line-
to-ground measurement that results in a calculated voltage
measurement. This voltage measurement is an indication that the
three-phase system is, or is not, working as expected.
The Clamp also indicates the phase rotation as 1-2-3 or 3-2-1 in
the three-phase system.
To setup:
1. Turn the control knob to U.
2. Connect the Clamp to ground with the ground lead.
3. Push
M for >2 seconds. The Clamp is in the line-to-line
mode and
x-y-z shows on the display.
To test:
1. Position the Clamp jaw around the first conductor.
Wait for the measurement on the display to settle.
x shows
on the display.
2. Move the Clamp jaw to the second conductor within
10 seconds.
Wait for the measurement on the display to settle. y shows
on the display.
3. Move the Clamp jaw to the next conductor within 10 seconds.
Wait for the measurement on the display to settle.
z shows
on the display.
When the x-y-z measurements are complete, use the Clamp to
calculate the total voltage between each pair of conductors:
1. Push
M. The displays shows the total voltage between L1
and L2.
2. Push
M again to show the total voltage between L2 and
L3.
3. Push
M again to show the total voltage between L3 and
L1.
While in the line-to-line mode, you can review each line-to-ground
measurement:
1. Push M again to show the L1 measurement.
2. Push
M again to show the L2 measurement.
3. Push
M again to show the L3 measurement.
To review L1-L2-L3 measurements, continue to push
M and
scroll through the measurements.
To exit the phase-to-phase mode, push
M for >2 seconds.
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