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1f3W power measurement is similar to 3f3W unbalanced power
measurement except the nomendature is different.
3.9.1. Two measurements of W
are required
3.9.2. Firstly, measure W
RS
a. Turn the power on without clamping on to any wire.
b. Set the rotary switch at 3f
c. Press the 3f button once, and only the 3f3W
symbol is left in LCD. At this moment. the W
blinks to instruct users to take measurement of
W
.
RS(L1G)
d. If the watt reading is not zero, press the DCA/DCW
ZERO button once to zero the watt reading
e. Insert the test leads into the input jack.
f. Connect the test prod of the COM (black) terminal
to ground.
g. Connect the test prod of V (red) terminal to the
second phase (eg. L1).
h. Clamp on to the same phase as in step g. (eg. L1).
i. The power clamp will automatically select proper
range.
j. Wait until the reading is stable, press the NEXT
button, and W
(W
RS
moment, (W
) is stored in the memory and W
RS(L1G)
(W
) symbol appears and blinks to instruct users
L2G
to take measurement of W
3.9.3. Secondly, measure W
a. Disconnect the test prob from the phase where
jaws is clamping on in the previous measurement.
b. Connect the test prob to the L2 line.
c. Open the jaws, so clamp meter is clamping to
nothing.
33
3.11. Improving Power Factor of a 3f4W Power System
3.11.1. Measure KVAR
(or KVAR
R
KVAR
(or KVAR
) values of each phase.
T
L3
3.11.2. Based upon the measured values, users can purchase
required 3f or 1f capacitor at rated voltage and
frequency to improve power factor.
3.11.3.If value of capacitance is needed, users can obtained
the value by the following equation.
Capacitance (Farad) =
where
f : frequency in Hz
V : phase voltage
3.11.4. It is recommended that the KVAR value of the capacitor
should be a little less than the value measured.
3.12. Improving Power Factor of a 3f Balanced Power System
3.12.1. Measure KVAR
value of a balanced system.
3f
3.12.2. Based upon the measured value, users can purchase
required 3f capacitor at rated voltage and frequency
to improve power factor.
3.12.3.If value of capacitance is needed, users can obtained
the value by the following equation.
Capacitance (Farad) =
where
f : frequency in Hz
V : phase voltage
3.12.4. It is recommended that the KVAR value of the
capacitor should be a little less than the value
measured.
35
(or W
) and W
(or W
RS
L1G
ST
L2G
(or W
) (refer to figure 14).
L1G
symboI
RS
) symbol will disappear. At this
L1G
ST
(W
).
ST
L2G
(or W
) (refer to figure 15).
ST
L2G
), KVAR
(or KVAR
),
L1
S
L2
KVAR *1000
2pfV
2
KVAR *1000
2pfV
2
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 L2 line where test prob is connected
)
to.
f. The power clamp will automatically select proper
range.
g. Wait until the reading is stabIe, press the NEXT
button. and W
this moment, W
3.9.4. Once the NEXT button is pressed after measurements
of W
add the two values together and show the result on the
LCD.
W
W
RST
of 1f3W unbalanced Power (refer to figure 16). PF is
not shown in 1f3W unbalanced power mode.
3.10. Calculation of 3f4W Power Factor (PF)
3.10.1.As measuring 3f4W unbalanced power, use the REC
button to record the individual power factor (KW
PF
R(L1)
in mernory.
3.10.2. With those data, 3f4W power factor can be calculated
by the fallowing equation.
KW
R(L1)
KVA
=
R(L1)
PF
R(L1)
KVA
= KVA
3f4W
KW
3f4W
PF
=
3f4W
KVA
3f4W
3.13. Improving Power Factor of a 1f2W Power System
3.13.1. Measure KVAR value of a 1f2W power system.
3.13.2. Based upon the measured value, users can purchase
required capacitor at rated voltage and frequency to
improve power factor.
3.13.3. If value of capacitance is needed, users can obtained
the value by the following equation.
Capacitance (Farad) =
where
f : frequency in Hz
V : phase voltage
3.13.4.
It is recommended that the KVAR value of the
capacitor should be a little less than the value
measured.
4500 : 28-09-2012
(or W
) symbol will disappear. At
ST
L2G
(or W
) is stored in the memory,
ST
L2G
(or W
) and W
(or W
) the power clamp will
RS
L1G
ST
L2G
= W
= W
+ W
1f3W
RST
RS(L1G)
ST(L2G)
symbol will be shown to indicate the watt
, KW
, PF
, KW
and PF
S(L2)
S(L2)
T(L3)
KW
KW
S(L2)
; KVA
=
; KVA
=
S(L2)
T(L3)
PF
PF
S(L2)
+ KVA
+ KVA
R(L1)
S(L2)
T(L3)
KVAR *1000
2pfV
2
,
R(L1)
) of each phase
T(L3)
T(L3)
T(L3)
34
36
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