Extech Instruments 382065 User Manual page 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 measurement.
RS (L2 L1)
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
B. Measure W
TS (L3 L2)
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 = W + W
φ
3 3W RS(L1L2)
=
φ
KVA K
3 3
W
W
KW
=
φ
PF
3 3
W
KVA
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
W ) and W (or W
L1L2 TS
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.
(refer to figure 5).
TS(L3L2)
2
2 +
φ φ
KVAR
3 3 3 3
W W
φ
3 3
W
φ
3 3
W
) in 3 φ 3W unbalanced power.
L3L2
9
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(W ).
L3 L2
TS
(or
RS
Model 382068 V3.0 4/2005