Model 382068 V3.0 4/2005
13
A. Measure W
R (L1)
/ P
FR (L1)
(refer to figure 6).
1. With the jaw enclosure empty, turn the meter on by setting the rotary switch to the 3
φ
4W
position.
2. Insert the test leads into the input terminals (black lead to the COM terminal and red to '+').
3. Connect the black lead's probe end to the neutral line.
4. Connect the red lead's probe end to the first phase (eg. R or L1).
5. Clamp on to the same phase as the red test lead (eg. R or L1).
6. The meter will automatically select the proper range.
7. Wait until the reading is stable (about 6 seconds) then press the READ button.
WL1
will
disappear and
WL2
will appear prompting the user to take a W
S (L2)
/ P
FS (L2)
measurement.
B. Measure W
S (L2)
/PF
S (L2)
(refer to figure 7)
1. Disconnect the red test lead from the phase where the jaws are clamped.
2. Connect the red test lead to the second phase (eg. S or L2).
3. Clamp onto the phase where the red test lead is connected (eg. S or L2 phase)
4. The meter will automatically select the proper range.
5. Wait until the reading is stable (about 6 seconds) then press the READ button.
WL2
will
disappear and
WL3
will appear prompting the user to take a W
T (L3
)
/ P
FT (L3
)
measurement.
C. Measure W
T (L3)
/P
FT (L3)
(refer to figure 8)
1. Disconnect the red test lead from the phase where the meter's jaws are clamped.
2. Connect the red test lead to the third phase (eg. T or L3 phase).
3. Clamp onto the phase where the red test lead is now 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.
WL3
will
disappear from the upper left hand area of the LCD.
6. The meter will process these three sets of data (refer to figure 9) and display the 3
φ
4W
power measurement (
WL123
will be displayed). The 3
φ
4W measurement will then be
stored in memory. The following equations are provided for your information.
W
3
φ
4W
= W
R(L1)
+ W
S(L2)
W
T(L3)
W
W
W
KVAR
W
K
KVA
4
3
2
4
3
2
4
3
φ
φ
φ
+
=
W
W
W
KVA
KW
PF
4
3
4
3
4
3
φ
φ
φ
=
Notes:
1. The "+" sign printed on jaw must face the power source.
2. For 3
φ
4W power measurements, WR or WS and WT must be positive. If any are
negative, check the test lead and clamp connections for polarity errors.
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