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3.3 AC+DC Current Measurement
3.3.1. A + Hz Dual Display
Fig.4
13
KVAR=KVA*sin u u u u u
WARNING :
Before taking measurement, users must make sure the current
(A) reading is zero by setting the rotary switch at A position. If the
current reading is not zero, users might get an incorrect KVA and
KVAR values.
3.5 Phase Angle Measurement
Fig.5
15
WARNING :
1. Do not clamp on to any conductor when turning on the power
of power clamp.
2. Make sure that all the test leads are disconnected from the
power clamp's terminals for current measurement.
a. Set the rotary switch at A (refer to figure 4).
b. Push and hold the DCAIDCWZERO once to zero the
reading.
c. Press the trigger to open the jaw and fully endose the
conductor to be measured. No air gap is allowed
between the two half jaws.
d. The power clamp will automatically select proper range.
e. Read the current and frequency values displayed in
LCD.
NOTE :
The sensitivity for current frequency measurement is 5A, and
the frequency range is 10 - 400Hz. If the frequency is < 10 Hz,
LCD will show 0 Hz. If the frequency is > 400 Hz, LCD will show
OL.
3 3.2. V + A Dual Display
Follow the instruction in section 3.6.3 3f AC+DC Balanced
Power Measurement V + A. Then users can monitor V and A
at the same time from LCD.
3.4. AC+DC 1f f f f f 2W Apparent/Readive Power Measurement
(KVA+KVAR)
Before any measurement, zero the current (A) reading. Then set
the rotary switch at KVA. The rest of the procedures are the
same as section 3.1 (AC+DC 1f2W Power (W) and Power Factor
(PF) measurement). Refer to figure 2 for test leads connection
and clamping of jaw.
KVAR is a calculated value, and its accuracy greatly depends
on the accuracy of V, A and KW. To obtain a more accurate
KVAR value when PF is greater than 0.91 (u<25
phase angle and obtain the KVAR from the following equation for
a pure sine wave.
3.5.1. Make sure the current reading is zero by setting the
rotary switch at A. If the current reading is not zero,
press the DCA ZERO button.
3.5.2. Set the rolary swiich at Phase (refer to figure 5).
3.5.3. Insert the test leads into the input jack.
3.5.4. Connect the test prod of the COM (black) terminal to
Ihe reference line.
3.5.5. Connect the test prod of the V (red) terminal to the
voltage signal to be detected.
3.5.6. Clamp on to the wire where V (red) terminal is
connected.
3.5.7. If current signal is detected from the jaws, the phase
angle will be displayed in degree in LCO together with
the frequency of voltage.
3.5.8. If the current signal is not detected from the jaws, only
the frequency of voltage will be displayed while the
phase angle is left blank.
WARNING :
Before taking measurement, users must zero the current (A)
reading to avoid incorrect reading of phase angle. To check if
current is zero, turn the rotary switch to current (A) function.
NOTE :
INDUCTIVE LOAD : Negative phase angle means current signal
lags behind voltage signal. If connection is correct, negative phase
angle also means inductive load.
CAPACITIVE LOAD: Positive phase angle means current signal
leads ahead voltage signal. If connection is correct, positive phase
angle also means capacitive load.
NOTE:
The "+" sign printed on jaw must face the power source for correct
result.
4500 : 28-09-2012
) measure the
0
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