PQ Option
Composite Harmonics Function (Volts)
11
11-11
Note
The resultant waveform has the RMS value as shown on the left-hand
display of the calibrator. Depending upon how many harmonics were
entered, this value is most likely different than the fundamental value.
Note
The build time that the calibrator requires is dependent upon the
complexity of the waveform. Waveforms with only HARMNIC A activated
take the shortest time. Waveforms with five tones (i.e. HARMNIC A – E
activated) take longer. The longest build time is for custom waveforms with
more than five tones. The preinstalled IEC and NRC waveforms, because
they have up to 49 harmonics, take over 1.5 minutes to build.
To minimize the build time of a waveform, leave the calibrator in Standby
whenever recalling, editing, or creating waveforms. The unit should be in
Operate Mode only when it is certain that the waveform is defined.
After building a waveform, pressing the "V" key will display the value of the
fundamental and also the range the calibrator is in.
How to Edit Waves
Note
The procedures for creating a new wave and editing a wave are essentially
the same. The difference between the NEW WAVE and EDIT WAVE menus
is that under the NEW WAVE section, all harmonic parameters default at
"0" until the user changes those parameters. In the EDIT WAVE Menu, a
wave that has either been in use, or a wave that was recalled can be edited.
To edit existing wave parameters, press the EDIT WAVE blue softkey. The Control
Display will change to the menu shown below. Press the HARMNIC A off blue softkey
and notice that the off/on display changes to "on". If there is already a composite
harmonic waveform in use, it may be edited from this menu.
nn334f.eps
Refer to "Creating New Waves" for a detailed description of how wave parameters can be
added and edited.
Note
Only the first 15 harmonics of a recalled IEC or NRC wave may be
changed or edited. Upon entering the EDIT WAVE menu, all harmonics
greater than 15 are removed from the waveform. Once the user exists the
EDIT WAVE menu (i.e. the HARMNIC A …. NEXT HARMNIC level), a new
waveform is built, since this wave does not have harmonics greater than 15.
How to Save Waves
Once a wave has been created or edited, the user may wish to save it for future use. To do
this, follow the steps for creating waves and editing wave harmonics. Then, from the
Wave Selection Menu, press the SAVE WAVE blue softkey. The Save Menu, shown
below, appears on the display.
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