3F4W Ac+Dc Unbalanced Power Measurement - Meco 4500 User Manual

g. Wait until the reading is stable, press the NEXT button,
and W symbol will disappear. At this moment, W
S
stored in the memory and W
3.8.4. Thirdly, measure W , (or W
T
a. Disconnect the test prob from the phase where jaws is
clamp on in 3.7.3.
b. Connect the test prod of the V (red) terminal to the third
phase (eg. T or L3 phase).
c. Open and close the jaws, so power clamp is clamping
to nothing.
d. If the watt reading is not zero, press the DCA/DCW ZERO
button once to zero the watt reading
e. Clamp on to the phase where test prob is conneted
(eg. T or L3).
f. The power clamp will automatically select proper range.
g. Wait until the reading is stable, press the NEXT button,
and W symbol will disappear. At this moment, W
T
stored in the memory.
3.8.5. Once the NEXT button is pressed after measurements of
W W and W the power clamp will add the three values
R S T
W , W and W together and show the result on the LCD.
R S T
W symbol will be shown to indicate the watt of 3f4W
RST
unbalanced power (refer to figure 13). PF is not shown in
3f4W unbalanced power measurement.
W = W = W + W
3f4W RST R(L1)
NOTE :
The "+" sign printed on jaw must face the power source, and make
sure all the connetions and clamping are correct for correct
measurement.
Note :
In the 3f4W unbalanced power measwement, all three W
and W must be positive. If users find one negative power, check
T
the connection of test leads and clamping of jaw. Make sure all
the connections and clamping are correct to obtain correct
power.
29
Fig.15
31
is
S
flashes in the display.
T
) (refer to figure 12)
L3
is
T
+ W
S(L2) T(L3)
or W
R S
3.9 1f f f f f 3W Power Measurment.
4500 : 28-09-2012
Fig.14
Fig.16
30
32