YOKOGAWA PZ4000, Руководство пользователя

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17-9
IM 253710-01E
Specifications
17
Harmonic Measurement
Item Specification
Method PLL synchronization method
Frequency range Fundamental frequency between 20 Hz and 6.4 kHz.
Measurement function See section 17.4 “Measurement Functions.”
Record length Same as for the normal measurement mode.
Number of points for the 8192. Arbitrarily set the start point of analysis in the acquisition memory.
FFT
FFT processing word 32 bit
length
Window function Rectangular
PLL source Select the voltage or current of an element that has a power measurement module installed or an
external clock input. The frequency range of the external clock when used as a PLL source is 20 Hz
to 6.4 kHz. For other specifications, see section 17.3, “Time Axis.”
External clock operation without using the PLL is also possible.
1/4096 of the external clock frequency is the fundamental frequency.
PLL source filter zero crossing filter
Antialiasing filter Line filter
Relationship between the sampling rate, window width, and harmonic order being analyzed (with hysteresis)
Fundamental Sampling Window width Upper limit of Maximum harmonic
*2
frequency
*1
of rate [S/s] (Number of cycles harmonic order order having the same
the PLL of the fundamental under analysis accuracy as the normal
source f [Hz] wave) measurement mode
20 - 40 f
×
4096 2 500 50
40 - 80 f
×
2048 4 500 50
80 - 160 f
×
1024 8 500 50
160 -320 f
×
512 16 200 25
320 - 640 f
×
256 32 100 25
640 - 1280 f
×
128 64 50 10
1280 - 2560 f
×
64 128 30 10
2560 - 6400 f
×
32 256 15 –
Accuracy
*2
For the accuracy corresponding to bandwidths for which the accuracy of the normal measurement
mode does not apply, add 0.001
×
f
×
(harmonic order)% of reading (designed spec), f is the
frequency (kHz) of the harmonic order being measured.
*1 The items of the fundamental frequency of the PLL source have hysteresis band widths.
*2 When the PLL source is set to a channel between CH1 and CH8. For the accuracy during the normal measurement mode,
see the specifications of each input module.
Save and Load data
Save setup parameters, waveform data, and numerical data to floppy disk or external SCSI device*.
Load the setup parameters or waveforms from the floppy disk or external SCSI device*.
* SCSI is an option.
Output Screen Image Data
Output the screen image data to the built-in printer*, external Centronics printer, or floppy disk or external SCSI device*.
* Built-in printer and SCSI are options.
17.5 Functions