382068-EU-EN-V4.0 12/11
9
A.
With the Clamp jaws empty, turn the meter on
by
setting the rotary switch to the 3
φ
3W position.
WL12 will appear on the upper left side of the LCD prompting the user to take a
W
RS (L2 L1)
measurement.
1. Insert the test leads into the input terminals (black to COM terminal and red to '+').
2. Select one phase (eg. S or L2) as COM and connect the probe end of the black lead to that
phase (eg. S or L2).
3. Connect the probe end of the red test lead to the second phase (eg. R or L1).
4. Clamp the meter onto the same phase as the red test lead (eg. R or L1).
5. The meter will automatically select the proper range.
6. Wait until the reading is stable (about 6 seconds), and then press the READ button.
WL23 will
appear prompting the user to take a measurement of
W
TS
(W
L3 L2
).
B. Measure W
TS (L3 L2)
(refer to figure 5).
1. Disconnect the red test lead from the phase where the clamp is connected.
2. Connect the red test lead to the third phase (eg. T or L3).
3. Clamp onto the third phase (where the red test lead is connected; eg. T or L3).
4. The meter will automatically select the proper range.
5. Wait until the reading is stable (about 6 seconds) and then press the READ button.
C. The power clamp will process these measurements
and display the result.
WL123
appears in the upper left corner of the LCD and the 3
φ
3W power measurement is
displayed in watts (this value is now stored in meter memory). The following equations are
provided for your information.
W
3
φ
3W
= W
RS(L1L2)
+ W
TS(L3L2)
WWW KVAR
W
KKVA 33
2
33
2
33
φφφ
+=
W
W
W
KVA
KW
PF
33
33
33
φ
φ
φ
=
Notes:
1.
Once a phase is designated as common (COM) it should remain as such in all
subsequent measurements. For example, if the S (or L2) phase is selected, S
(or L2) phase is connected to COM during the measurements of W
RS
(or
W
L1L2
) and W
TS
(or W
L3L2
) in 3
φ
3W unbalanced power.
2. The "+" sign printed on the jaw must face the power source.
3. In 3
φ
3W unbalanced power measurements, if either WRS or WTS is negative
(connection error) ensure that all test lead and clamp connections are correct.
