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equipment. The IEC D waveform is the limit for Class D equipment. These waveforms,
when used in the PQ current output mode, are particularly useful for checking the
performance of instruments that are designed to check these limits.
NRC Waves
NRC 2 and NRC 4 are voltage waveforms captured in actual fieldwork by the NRC.
NRC 3 and NRC 5 are current waveforms captured in actual fieldwork by the NRC.
NRC 2 and NRC 3, and NRC 4 and NRC 5 are voltage and current combinations.
Waveforms 2 to 5 have up to 49 harmonics, with many of these with amplitudes less than
1 % of the fundamental.
NRC7030 is a synthesized waveform with rich harmonic content (25 harmonics) and a
low crest factor, to give the measuring instrument the best signal to noise ratio. All 25
harmonics have an amplitude that is 10 % of the fundamental. This waveform is useful in
both the voltage and current mode to check the performance of power quality analyzers.
How to Recall Preinstalled IEC Waves
From the Wave Selection Menu, press the RECALL WAVE blue softkey. The Recall
Wave Menu appears in the Control Display. Press the RECALL IEC blue softkey. The
IEC Wave Menu, shown below, appears in the Control Display.
After choosing "IEC A" or "IEC D", if the calibrator is in Standby mode, the RECALL
Menu appears again. The recalled wave will not be built until the calibrator is placed in
Operate Mode. Because of the complexity of these waves, the building process for these
waves is over one minute. If the calibrator is already in Operate Mode, the recomputing
message shows on the Control Display, then the RECALL Menu appears.
How to Recall Preinstalled NRC Waves
From the Wave Selection Menu, press the RECALL WAVE blue softkey. The Recall
Wave Menu appears in the Control Display. Press the RECALL NRC blue softkey. The
NRC Wave Menu, shown below, appears in the Control Display.
If the calibrator is in Standby Mode, the RECALL Menu appears. The recalled wave will
not be built until the calibrator is placed in Operate Mode. Because of the complexity of
these waves, the building process for these waves is over one minute. If the calibrator is
already in Operate Mode, the recomputing message shows on the Control Display, then
the RECALL Menu appears.
Composite Harmonics Function (Amps)
Creating and editing waves for current outputs is similar to editing waves for voltage
outputs described previously. After entering the PQ Mode and accessing Composite
Harmonic Function, create a composite harmonic current waveform by entering the
Composite Harmonics Function (Amps)
nn357f.eps
nn358f.eps
11
PQ Option
11-13
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