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3.Thirdly, measure W
T
a.
Disconnect the test lead from the phase
where the Jaw was connected in the
section entitled "3φ3W Unbalanced
Power Measurements".
b.
Connect the test lead inserted in the V
(red) terminal to the third phase (T or
L3 phase).
d.
If the watt reading is not zero, press the
DCA/DCW ZERO button once to zero
reading
e.
Clamp onto the phase where test lead
is connected to (T or L3).
f.
The power clamp will automatically
select the proper range.
g.
Wait until the reading stabilizes, then
press the NEXT button. The W
4. Once the NEXT button is pressed (after measurements of W
the three values W
appear indicating that the reading shown is the wattage of the 3φ4W unbalanced circuit. PF is not
shown in the 3φ4W unbalanced power measurement mode.
NOTE: The "+" sign printed on jaw must face the power source.
NOTE: In the 3φ4W unbalanced power measurement mode, all three W
must be positive. If one is negative, check the connection of the test leads and the clamping of
jaw. Make sure test lead and clamp connections are correct to obtain useful power readings.
(or W
). See Fig. 11.
L3
symbol will disappear and W
T
, W
, and W
together and display the result on the LCD. The W
R
S
T
W
= W
3φW
RST
3 Phase 4 Wire
R(L1)
S(L2)
Current >
T(L3)
N
W
R
S
= W
+ W
R(L1)
S(L2)
www.burntec.com
W
T (L3)
3 Phase
Load
FIGURE 11
will be stored in memory,
T
, and W
), the power clamp will add
T
RST
+ W
T(L3)
or W
and W
R
S
symbol will
readings
T
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