Extech Instruments VT30-E User Manual page 5

3-Phase Rotation
The 3-phase rotation function indicates
identifies the phase orientation of the three wires before attaching them to a motor or other equipment.
The phase sequence will determine the direction (Clockwise or Counter-clockwise) a motor will
when connected.
To determine clockwise rotation (P1-P2-P3)
1. Touch probe L1 to
2. Touch probe L2 to the other two phases. One phase will indicate "L" and one will indicate "R"
3. Label the phase that indicates "R" as P2.
4. Touch probe L1 to phase P2 and touch probe L2 to the remaining unlabeled
The "R" icon will illuminate. Label this phase P3.
5. The clockwise sequence P1-P2-P3 (also known as 1-2-3 or R-S-T) has been identified.
6. To determine a counterclockwise rotation exchange the "L" and "R" in the procedure.
L1
Continuity Test
The tester can measure resistance and alert the user if the resistance value is less than 200kΩ.
1. Before taking a continuity test, make sure that power to the device or circuit under test is off
and that all capacitors are discharged.
2. Touch the test tips to the device under test.
3. If the resistance is less than 200kΩ, the tester will sound an audible alert; the LCD will display
"000", and the
Flashlight
Press and hold the
the button is released, the light will turn off after 12 seconds (approx).
whether
any one of the three AC mains.
P1 P2 P3
L1
continuity LED will light.
button to turn the flashlight on. Release the button to turn the flashlight off. After
the 3 phase AC lines or mains
Label this phase P1.
P1 P2 P3
L2
5
are live and also
AC main
L1
L2
VT30-E-EU-EN-V5.0-3/12
rotate
wire.