Pacific Power Source UPC-1, Руководство по эксплуатации

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SECTION 4 OPERATION
37
4.3.1.1 WAVEFORM ANALYSIS (cont’d)
(OPTION- Harmonic Analysis and Synthesis)
The default harmonic content is displayed based upon the percentage of the fundamental. The EDIT
key displays a setup screen that allows selection of the harmonic content display as absolute value,
rather than percentage. Use the
+/- key to select the setup preferences then press DISPLAY to return to
the harmonic data screen.
The Number of Samples Analyzed is the same as the Metering Samples Per Cycle and can be changed
in the Frequency Span setup screen (para. 2.1.1, 4.6.3.2, and 5.4.1). The value of Number of Samples
to Analyze will be as listed below. The accuracy of the harmonic calculations improves as the Number of
Samples increases. There is a small increase in the calculation time.
Fre quency
Span
(Hz.)
Number of
Samples
number of
harmonics
displayed
Time of
calculation
(approx.)
15 – 150 512 51 3 sec.
15 – 300 256 51 2 sec.
15 – 600 128 51 1 sec.
15 – 1200 64 32 0.7 sec.
Press
ENTER to process new harmonic analysis data
The LCD will always display 51 harmonic positions. The full harmonic data set is also available through
the communication port. See para. 5.5.2, Metered Data Queries,
:MEASure:SPECTrum:VOLT1[:MAGnitude] and :MEASure:SPECTrum:PHASe.