226
U7005 15MS/s Input Unit
Accuracy specications
Apparent power (S)
measurement
accuracy
(voltage accuracy) + (current accuracy)
±
10 digits
Reactive power (Q)
measurement
accuracy
For any condition except if
φ
= 0
°
or
±
180
°
(Apparent power accuracy)
±
{1 − sin[
φ
+ (Power phase angle accuracy)] / sin
φ
}
×
(100% of reading)
±
[
√
(1.001 −
λ
2
) −
√
(1 −
λ
2
)]
×
(100% of range)
For
φ
= 0
°
and
±
180
°
(Apparent power accuracy)
±
[sin(Power phase angle accuracy)]
×
(100% of range)
±
(3.16% of range)
The symbol
λ
designates the display value of the power factor.
Power factor (
λ
)
measurement
accuracy
For any condition except if
φ
=
±
90
°
±
{1 − cos[
φ
+ (power phase angle accuracy) / cos
φ
]}
×
(100% of reading)
±
50 digits
For
φ
=
±
90
°
±
cos[
φ
+ (Power phase angle accuracy)]
×
(100% of range)
±
50 digits
The symbol
φ
designates the display value of the power phase angle.
Both of the above are specied at voltage/current range rating input.
Waveform peak
measurement
accuracy
(Voltage/current RMS value accuracy)
±
(1% of range)
(300% of range is applied as a peak range)
Eects of temperature Add the following to the voltage, current, and active power accuracy within the range of
0
°
C to 20
°
C or 26
°
C to 40
°
C:
±
0.01% of reading per degree centigrade
Add another 0.01% of range per degree centigrade for DC.
Common-mode voltage
rejection ratio
(Eects of common-
mode voltage)
50 Hz/60 Hz: 120 dB or more
100 kHz: 110 dB or more
Specied for CMRR when the maximum input voltage is applied between the voltage
input terminals and enclosure for all measurement ranges.
Eects of external
magnetic elds
±
1% of range or less
(in a magnetic eld of 400 A/m, DC or 50 Hz/60 Hz)
Eects of the power
factor on the active
power
For any condition except if
φ
=
±
90
°
±
{1 − cos[
φ
+ (Phase dierence accuracy)] / cos
φ
}
×
(100% of reading)
For
φ
=
±
90
°
±
cos[
φ
+ (Phase dierence accuracy)]
×
(100% of VA)