382075 V2.2V 9/10
8
AC/DC 1
φ
2W Apparent/Reactive Power Measurements (KVA+KVAR)
NOTE: Before taking any measurements, zero the current (A) reading and
set the rotary switch to the KVA position.
Follow the steps listed in section entitled DC+AC 1
φ
2W Power (W) and Power Factor
(PF) measurement for these measurements. KVAR is a calculated value, and its
accuracy greatly depends on the accuracy of the V, A, and KW readings. To obtain a
more accurate KVAR value when PF is greater than 0.91 (
φ
< 25
°
), measure the phase
angle and obtain the KVAR from the following equation for a pure sine wave:
KVAR = KVA * sin
φ
Phase Angle Measurements
1.
Set the rotary switch to the A position. If the current reading is not zero, press the
DCA ZERO button.
2.
Set the rotary switch to the Phase position.
3.
Insert the test leads into the input jacks.
4.
Connect the test lead inserted in the COM (black) terminal to the reference line.
5.
Connect the test lead connected to the V (red) terminal to the voltage signal under
test.
6.
Clamp on to the wire where the V (red) terminal is connected.
7.
If current signal is detected from the jaws, the phase angle will be displayed in
degrees on the LCD together with the frequency of the voltage.
8.
If current is not detected, only the frequency of the voltage will be displayed while
the phase angle display will be left blank.
INDUCTIVE LOAD
: A negative phase angle indicates that the current signal lags the
voltage signal. A negative phase angle also indicates an inductive load.
CAPACITIVE LOAD:
A positive phase angle indicates that the current signal leads
the voltage signal. A positive phase angle also indicates a capacitive load.
NOTE:
The "+" sign printed on the clamp jaw must face the power source for correct
readings.
