YOKOGAWA PZ4000, Руководство пользователя

Страница: 372 / 417

17-18
IM 253710-01E
Item Specification
Power accuracy Conditions
• Within 3 months after calibration
• Standard operating conditions
• Power factor : 1
• Input signal : Sine wave
• Common mode voltage : 0 V
• Input signal is 5 cycles or less and there are at least 10 k-words of sampled data within the
observation time.
• DC accuracy is NULL function : ON and line filter : ON.
• f is the frequency.
Frequency Accuracy
±
(reading error + measurement range error)
DC
±
(0.2% of r 0.1% of range)
0.1 Hz
≤
f < 10 Hz
±
(0.2% of r 0.05% of range)
10 Hz ≤ f < 45 Hz ± (0.2% of r 0.025% of range)
45 Hz
≤
f
≤
1 kHz
±
(0.1% of r 0.025% of range)
1 kHz < f
≤
10 kHz
±
(0.1% of r 0.04% of range)
10 kHz < f
≤
50 kHz
±
(0.2% of r 0.05% of range)
50 kHz < f
≤
100 kHz
±
(0.6% of r 0.1% of range)
100 kHz < f
≤
200 kHz
±
(1.5% of r 0.15% of range)
200 kHz < f
≤
400 kHz
±
(1.5% of r 0.15% of range)
400 kHz < f ≤ 500 kHz ± ((0.1 + 0.009 × f*)% of r 0.15% of range)
500 kHz < f ≤ 1 MHz ± ((0.1 + 0.009 × f*)% of r 1.5% of range)
* The unit of f in the equation for the reading error is (kHz).
One year accuracy
± ((reading error) + (measurement range error) × 1.5), calibration period is one year.
Power factor cos φ ( λ ) influence
• When cos φ = 0
• 45 to 66 Hz : Add (apparent power reading) × 0.0015
• Other frequencies : Add (apparent power reading) × 0.0002 × f (designed value).
However, add at least (apparent power reading) × 0.0015. f is the frequency (kHz).
• When 0 < cos φ < 1
• 45 to 66 Hz : Add (0.15 × tan φ )% of reading.
• Other frequencies : Add (0.02 × f × tan φ )% of reading (designed value). However, add
at least (0.15 × tan φ )% of reading. f is the frequency (kHz).
Influence from the amplitude of the input signal and frequency
For input voltages of 400 Vrms or more, add (reading error) × 1.5 × U
2
% of reading. For input
voltages of 400 Vrms or more and frequencies of 100 kHz or more, add an additional 0.005 ×
f × U
2
% of reading (designed value).
U : input voltage (kV), f : frequency (kHz)
Line filter influence
Add 1% of reading to an input signal whose frequency is 1/10th of the cut-off frequency when
the line filter is ON.
Measurement range influence
• As shown in the above table when the input signal is a sinusoid and its rms value is
between 5 and 55% of the measurement range.
• As shown in the above table when the input signal is a DC signal and the value is between
–55 and 55% of the measurement range.
• The (reading error) is doubled when the input signal is a sinusoid and its rms value is
between 55 and 70% of the measurement range.
• The (reading error) is doubled when the input signal is a DC signal and the value is
between –100 and –55% or 55 to 100% of the measurement range.
(Power accuracy continues on next page)
17.15 Power Measurement Module (253751)