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Chapter 15 Specifications
15.5 Computing Functions
Apparent Power
Effective Power
(VA)
(W)
1-phase
W
VA=V×A
2-wire
W
VA
=V
×
A
i
i
i
i
=1, 3
=1, 3
i
i
ΣW
ΣVA
=W
+W
=VA
+VA
1
3
1
3
×
VA
=V
A
W
i
i
i
i
=1, 3
=1, 3
i
i
ΣVA
ΣW
3
=W
+W
1
3
=
2
(VA
+VA
)
1
3
×
W
VA
=V
A
i
i
i
i
=1,2,3
=1,2,3
i
i
ΣW
ΣVA
3
=W
+W
1
3
=
3
(VA
+VA
+VA
)
1
2
3
W
VA
=V
×
A
i
i
i
i
=1,2,3
=1,2,3
i
i
ΣW
ΣVA
Σvar
=
=var
=W
+W
+W
VA
+VA
+VA
1
2
3
1
2
3
Depends on the
Depends on
Same as apparent
Computating
the selected
selected V and A
power (var ≤ 0)
Range
V and A ranges
ranges
Display
10000
10000
resolution
Computing
accuracy (for
±0.005% of
the value
—
operated from
VA range
the measured
value)
Note 1: The apparent power (VA), reactive power (var), power factor (PF), and phase angle
(deg) measurements in this instrument are computed digitally from the voltage,
current and effective power. If the input is non-sinusoidal, the measured values may
differ from those obtained with instruments employing different measurement
principles.
Note 2: When the current or voltage is less than 0.5% of the range, the VA and var will be
displayed as 0, and PF/deg will be displayed as an error.
Note 3: The Lead and Lag are displayed for V and A input at 50% or more. The detected
lead/lag accuracy is ±5 degrees over the frequency range of 20 Hz to 2 kHz.
15.6 Display Functions
Display type:
7-segment LED
Number of displays:
3
DISPLAY
Displayed Value
A
V, A, W, VA, var (each element), elapsed integration time
B
V, A, W, PF, deg (each element), % (contents ratio in %, THD)
V, A, W, V ⋅ AHz, ±Wh, ±Ah (each element)
C
Vpk*, Apk*, MATH*
* Vpk, Apk, and MATH are supported only for ROM versions 2.01 or later.
Unit:
m, k, M, V, A, W, VA, var, Hz, h±, deg, %
Display update rate:
4 times/s
Response time:
Approximately 0.5 s (time for displayed value to settle within
accuracy specifications of final value after step change from 0% to
100% or 100% to 0% of rated range)
Display scaling function Significant digits:
significant digits in the voltage and current ranges
Reassign ratio:
Averaging function:
The following two algorithms can be selected:
Exponential averaging
Moving averaging
Response can be set; for exponential averaging, the attenuation
constant can be selected and for moving averaging, the number of
averages (N) can be set to 8, 16, 32, or 64.
Peak over range display The alarm LED will light up when the RMS value is greater than
140% of the range or the peak value is greater than 300% of the
range.
15-2
Reactive Power
Power Factor
Phase Angle
(var)
(PF)
(deg)
W
W
–1
2
2
=cos (
(VA) –W
VA
VA
ϕ
var
PF
i
i
i
W
W
2
2
=
i
(VA
) –W
i
i
=
=
–1
cos (
VA
VA
=1, 3
i
i
=1, 3
=1, 3
i
i
Σvar
ΣPF
Σϕ
Σ
Σ
W
=var
+var
W
1
3
=
=
–1
cos (
Σ
Σ
VA
VA
ϕ
var
PF
i
i
i
W
W
2
2
=
i
(VA
) –W
i
i
=
–1
=
cos (
VA
=1, 3
VA
i
i
=1, 3
=1, 3
i
i
Σϕ
Σvar
ΣPF
Σ
Σ
W
=var
+var
W
1
3
=
=
–1
cos (
Σ
Σ
VA
VA
ϕ
PF
var
i
i
i
W
W
2
2
i
=
(VA
) –W
i
i
=
=
–1
cos (
VA
=1,2,3
VA
i
i
=1,2,3
=1,2,3
i
i
Σvar
ΣPF
Σϕ
Σ
Σ
W
=var
+var
W
1
3
=
=
–1
cos (
Σ
Σ
VA
VA
ϕ
var
PF
i
i
i
W
2
2
W
=
i
(VA
) –W
i
i
=
=
–1
cos (
=1,2,3
VA
VA
i
i
=1,2,3
=1,2,3
i
i
Σϕ
ΣPF
Σ
Σ
W
+var
+var
W
1
2
3
=
=
cos (
–1
Σ
Σ
VA
VA
-1 to 0 to 1 -180 to 0 to 180
±1.000
±180.0
10000
Resolution
±0.005% of
±0.0005
(power factor
var range
±0.0005)
Maximum Reading
V, A, W : 9999
Wh, Ah : 999999
V, AHz : 9999
Selected automatically according to
0.001 to 1000
15.7 Integrator Function
Display resolution:
Depending on elapsed time value, the resolution will be changed.
Maximum display:
–99999 to 999999 MWh (or MAh)
Modes:
Standard integration mode (timer mode)
)
Continuous integration mode (repeat mode)
Manual integration mode
Timer:
When the timer is set, integration will be stopped automatically.
Setting range: 000 h:00 min to 999 h:59 min (000 h:00 min will be
i
)
shown when manual integration mode is selected automatically.)
i
Count overflow:
If the integration count flows above 999999 MWh (or MAh) or below
–99999 MWh (or MAh), integration stops and the elapsed time is
held on the display.
±(display accuracy + 0.2% of rdg) However, only when the input
Accuracy:
)
signal is continuous.
±0.02%
Timer accuracy:
Remote control:
Start, stop, and reset can be remotely controlled by external
contact signals.
i
However, the /DA4 or /DA12 options must be installed.
)
i
15.8 Internal Memory Function
Measurement data
)
Number of data that can be stored:
i
)
Each block has following data:
i
)
Panel setup information: Four-pattern information can be written/read.
15.9 D/A Converter (optional)
i
)
±5 VDC FS (approximately ±7.5 V maximum) at rated value or
Output voltage:
i
range Number of output channels: 12 when the /DA12 option is
installed; 4 when the /DA4 option is installed
Output data selection:
Can be selected for each channel.
±(Display accuracy + 0.2% of range)
Accuracy:
)
Update rate:
Identical to display update interval
Temperature coefficient: ±0.05% of f.s./ °C
• Frequency
D/A output
Approx. 7.5V
5.0V
2.5V
0.5V
0.2V
4
10
• Integration
D/A output
Approx. 7.0V
5.0V
0
t
: Rated value setting time
0
• Other items
Displayed value
140%
Approx. 7.0V
100%
0%
–100%
–140%
Approx. –7.0V
However, for PF and deg,
points in the range from +5
to +7 V and from –5 to –7 V
are not output. If there is
an error, the output will be
about ±7.5 V.
WT110 (253401): 600 blocks
WT130 (253502): 300 blocks
WT130 (253503): 200 blocks
measurement setting mode, measurement ranges, V, A, W,
Wh+, Wh-, Ah+, Ah-, elapsed time and frequency
Writing intervals: 250 ms and 1 s to 99 h: 59 min: 59 s
Reading intervals: 250 ms and 1 s to 99 h: 59 min: 59 s (both
intervals can be set on a second basis)
100
1k
10k
50k
140% input of the rated value
Rated value input
t
0
D/A output
Output
Approx. 7.5V
Approx. 7.0V
5.0V
5.0V
0V
–5.0V
–140%
–100%
0V
100%
–5.0V
Approx. –7.0V
Approx. –7.5V
Displayed value [Hz]
Integration time
Displayed
value
140%
IM 253401-01E
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