Vitrek Xitron 6000-2, User Manual

Page: 99 / 101

Appendix B 99
Mode Effect: Add (0.04 + 5F/F
C
)° for voltage: current phase.
Ranging Effect: Add (0.02 + 3F/F
C
)° per range difference between inputs.
Fundamental Frequency Measurement
Accuracy: 0.01% + (0.03% divided by measurement period in seconds).
Min. Fundamental: 5% of range.
Frequency Range: 0.0005Hz to 200kHz.
Technique: Period measurement of filtered signal using a “tracking” bandpass
filter having a bandwidth of 0.8 to 1.2 times the measured
fundamental frequency.
Harmonic Rejection: Detects fundamental component having an amplitude down to 30%
of total signal.
Measurement Filter: Optional “moving average” filtering may be applied.
Response Time: <1.5 measurement periods.
Harmonic Analysis
Normal Analysis: User definable window period between 1 and 512 fundamental
cycle periods, using rectangular window with no overlap and with
no gaps for fundamental frequencies <100Hz. Automatically sized
(256 to 4096 point) Fast Fourier Transform with average sampling
frequency maintained within 10ppm of relevant ratio from the
fundamental frequency.
Windowed Analysis: User definable window period between 8 and 512 fundamental
cycle periods, using a modified Blackman-Harris window with no
overlap and with no gaps for fundamental frequencies <100Hz.
Automatically sized (256 to 4096 point) Fast Fourier Transform
with sampling frequency maintained within 10ppm of relevant ratio
from the fundamental frequency.
Frequency Range: 0.0005Hz to 150kHz, up to 2047th harmonic.
Abs. Single Harmonic: (0.05 + 2F/F
C
)% of r 0.01% of range + (2F/F
C
)% of total
signal. F is the frequency of the harmonic.
Abs. Harmonic Range: (0.05 + 2F/F
C
) % of r (0.01% of range + (2F/F
C
) % of total
signal).
√
(number harmonics). F is the frequency of the
fundamental.
THD Accuracy: (0.01 + 2F/F
C
) %. (range / total signal level) .
√
(number
harmonics). F is the frequency of the fundamental.