3-Wire Kw, Hp, Kva, Kvar, Power Factor & Phase Angle Measurement - Extech Instruments Extech 380976 User Manual

3Φ 3-Wire KW, HP, KVA, KVAR, Power Factor & Phase Angle Measurement
1. First, measure W
a. Set the rotary switch to the "
b. Press and hold the "HOLD" key while setting the rotary switch to "KW/KVA", the 3φ3W and
W symbols will appear.
L12
c. Insert the test leads into the jacks.
d. Select a phase (e.g. S or L2) as COM and connect the test probe of the COM (black)
terminal to that phase (e.g. S or L2).
e. Connect the test probe of V (red) terminal to the second phase (e.g. R or L1).
f. Clamp the same phase as step e. (e.g. R or L1).
g. The power clamp will automatically select the proper range.
h. Wait until the reading is stable (about 6 seconds). Press the "HOLD" key to store the
measured value. The W
2. Second, measure W
a. Disconnect the test probe from the phase where the jaw clamp was set in the previous
measurement.
b. Connect the test probe to the third phase (e.g. T or L3).
c. Clamp the third phase where test probe is connected to (e.g. T or L3)
d. The power clamp will automatically select the proper range.
e. Wait until the reading is stable (about 6 seconds) and then press the "HOLD" key to store
the measured value.
(refer to the diagram below).
RS(L1L2)
symbol will appear.
L23
(refer to the diagram that follows the steps below).
TS(L3L2)
V ".
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