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Proceed as follows to identify the 3-phase rotating direction:
- Turn the DMM on and select measuring function “Motor”.
The display shows “AC” and the unit “V”.
- Plug the red measuring line into the V measuring jack (E)
and the black measuring line into the COM measuring jack
(D).
- Keep the button “SELECT” pressed for approx. 2 seconds.
Two beeps are output and the lock icon (H19) will flash.
The automatic measuring range setting is deactivated and
the 600 V-range is selected. The display will show approx.
0.0 V.
- Connect the black measuring prod to the outer conductor
L3. This connection remains unchanged throughout the
test. Connect the red measuring prod to the outer conduc-
tor L1.
- Once the meter recognises two outer conductors, the nor-
mal voltage will be displayed and the lock icon will remain lit.
- Now switch the red measuring prod to outer conductor L2
within 5 seconds. If the time for measuring point change
is exceeded, the DMM will interrupt the measurement and
the function must be restarted.
- The meter will evaluate the phase offset of the three sub-
sequently determined outer conductors at correct measur-
ing point change, and display the rotating direction via two
symbols in the display. The arrow direction of the symbols
shows the respective rotating direction:
Clockwise = right turning
Counter-clockwise = left-turning
- For another measurement push the button “SELECT” once
briefly. To deactivate the function, keep the “SELECT” but-
ton pushed for at least 2 seconds.
- Remove the measuring lines from the object to be meas-
ured after completion of the measurement and switch off
the DMM.
The function buttons “RANGE”, “MAX MIN”, “REL”, “Hz” and “HOLD” are deactivated in this measuring
function and cannot be selected.
When measuring 3 phase motor drives with variable frequency speed control interference can occur (PWM
interference). In order to minimize this interference a longer measuring time (≥30 s) is required.
In this case, the nominal voltage indicated is only a reference value. The precision indicated is not valid for
speed-controlled motor drives.
