Hioki Power HiTester 3193, Instruction Manual

Page: 72 / 310

54
────────────────────────────────────────────────────
4.12 Setting on the SYSTEM screen
────────────────────────────────────────────────────
4.12.4 Setting the Equation for Reactive Power (Q) and
Apparent Power (S)
F1 F2 F3
CALCULATION
SYSTEM
NOTE
This unit provides three different internal ways of computing the reactive
power and apparent power. Select whichever is appropriate.
See Section 20.3, "Calculations."
1. Press the STATUS key, then use the PAGE ( )
keys to display the " SYSTEM " page.
2. Using the
CURSOR
keys, move the cursor to the
"
CALCULATION
" item.
3. Select calculation type from
F1
(TYPE1) ,
F2
(
TYPE2
),
F3
(
TYPE3
).
4. Press the
MEAS
key to return to the measurement
screen.
414-1.tif CHANGE
･
For calculation, see Section 20.3, "Calculations"
･
In general, use "
TYPE1
". Select "
TYPE2
" or "
TYPE3
" when required for
compatibility with previous models.
･
The values yielded by the different methods of calculation coincide when the
input is a sine wave on a balanced line, but may be different when there is
distortion present or unbalanced line.
･
When " TYPE1 " is selected, the reactive power calculation for 1P3W and
above includes the lead/lag of the current with respect to the voltage. The
detection of the sign of this lead or lag is carried out by zero-crossing
detection on the voltage and current waveforms by the input units. For this
reason, stable measurement may not be possible when the waveforms are
distorted. In such cases, use a phase polarity discrimination filter (phF) in
addition. See Section 4.7.
･
The power factor and phase angle are also derived from the selected
calculation result.
･ If [TYPE1] is selected as the calculation tpe while using averaging (time
averaging, moving averaging, or indexed averaging), the "si" and "su"
polarities for each channel are calculated as +1.