SECTION 4 OPERATION
36
4.3.1 METERING DISPLAYS (cont)
4.3.1.1 WAVEFORM ANALYSIS
(OPTION- Harmonic Analysis and Synthesis)
Waveform analysis functions are optionally available to report both magnitude and phase angle (relative
to 0º of the fundamental voltage waveform) of each harmonic for metered voltage and current
waveforms. THD, ODD and EVEN harmonic distortion measurement data can also be displayed
The harmonic content is displayed from the 2nd up to the 51st harmonic, depending on the number of
samples analyzed. Content can be displayed as percent or absolute, see the EDIT key function
described below.
Pressing the DISPLAY key repeatedly will display the following screen.
HARMONIC ANALYSIS:
“ENTER” UPDATE & DISPLAY HARMONIC DATA
“EDIT” HARMONIC ANALYSIS SETUP SCREEN
“HELP” HARMONIC ANALYSIS HOTKEY LIST
Pressing the DISPLAY key repeatedly at this point will display the HARMONIC DATA in memory with
screens similar to the following.
ΦA VOLTAGE THD=0.1 % OHD=0% EHD=0.1%
HARMONIC: FUND 2nd 3rd 4th
CONTENT: 100% 0.17 0.09 0.03
ΦANGLE: 0º 49º 14º 315º
THD is TOTAL HARMONIC DISTORTION for all harmonics of the selected parameter and phase.
OHD is ODD HARMONIC DISTORTION for all harmonics of the selected parameter and phase.
EHD is EVEN HARMONIC DISTORTION for all harmonics of the selected parameter and phase.
CONTENT is displayed as a percent of the amplitude of the fundamental or as absolute magnitude
ΦANGLE is displayed in the range of 0º to 359º.
The Va, Vb and Vc keys will light the Phase LED to select which phase is to be updated or displayed.
Only one phase can be analyzed at a time. Pressing the +/- key will toggle between current and voltage
parameters.
The CLEAR key will return the display back to the V/I meter.
The ENTER key begins the analysis function. The UPC will measure the selected signal, and calculate
and update the harmonic data in memory. This may take some time, depending on the number of
samples analyzed (see the EDIT key function below). A beep is heard when the update is complete.
Only the parameter and phase selected as above is updated. Other parameters are retained. All
parameters are then retained until power-off or the memory is cleared.
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