PROVA 21 - Operating Instructions: Single-Phase Power Quality; Single-Phase AC Power Quality Measurement

16
III.3 Measurement of Single Phase AC Power Quality (21, 23)
NOTE:
1. Select the correct fundamental frequency of current and voltage by moving the
sliding switch at the side of the tester.
2. Select the proper position of the rotary switch for the range of current. If the AC
current is less than 0.6A, then set the rotary switch at the position of W-mA. I
f
the AC current is greater than 0.6A, then set the rotary switch at the position o
f
W-A.
3. If the peak value of the input AC current is greater than the maximum value o
f
the range, then symbol of OL will be displayed.
4. If users hold the
▲
button and turn the power on, the unit enters the AUTO Hz
mode. The unit will automatically detect the frequency between 45 to 65Hz.
Additional error occurs if the measured frequency is not 50 or 60 Hz.
NOTE: Whenever the rotary switch is set at a new position, the CT ratio and
fundamental frequency will be displayed first.
NOTE: If the CT ratio is not 1, a symbol of “CT” will be shown in the LCD display for
the measurement of W-mA or W-A.
A
U
T
O
-
P
O
W
E
R
-
O
F
F
T
u
r
e
R
M
S
--
+
+
--
+
3