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φ
3
4W Unbalanced Power Measurements
The measurements of W
1. First, measure W
R
a. Apply power to the meter with the jaw clear of any conductors.
b. Set the rotary switch to the 3φ position.
c. Press the 3φ button twice, and the 3φ4W symbol appears singularly on the left side of the LCD.
The W
symbol will flash prompting the
R
user to take the W
Note: If the watt reading is not zero, press the
DCA/DCW ZERO button once to zero
reading
d. Insert the test leads into the input terminals
e. Connect the neutral line to the COM
(black) terminal.
f.
Connect the V (red) terminal test lead to
the first phase (R or L1).
g. Clamp on to the same phase (R or L1).
h. The power clamp meter will automatically
select the proper range.
i.
Wait until the reading is stable, then press
the NEXT button. The W
symbol flashes prompting the user to take the W
2. Measure W
(or W
S
a.
Disconnect the test leads from the phase
where the jaw was clamped onto as
described in the section entitled "3φ 3W
unbalanced power measurements".
b.
Connect V (red) terminal to the second
phase (S or L2).
d.
If the watt reading is not zero, press the
DCA/DCW ZERO button once to zero
reading
e.
Clamp onto the phase where the test
lead is connected to (S or L2 phase)
f.
The power clamp will automatically select
the proper range.
g.
Wait until the reading stabilizes, then press the NEXT button. The W
is now stored in memory.
(or W
), W
(or W
), and W
R
L1
S
L2
(or W
) (Fig. 9).
L1
measurement
R.
symbol will disappear. Now, W
R
) (Fig. 10).
L2
(or W
) are required for these measurements.
T
L3
3 Phase 4 Wire
Current >
R(L1)
S(L2)
T(L3)
N
is stored in the memory, and the W
R
measurement.
S
3 Phase 4 Wire
R(L1)
Current >
S(L2)
T(L3)
N
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W
R (L1)
3 Phase
Load
FIGURE 9
W
S (L2)
3 Phase
Load
FIGURE 10
symbol will disappear. W
S
S
S
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