Test & Measurement


New option adds powerful functionality to calibrator

23 August 2006 Test & Measurement

The 5520A-PQ option enables Fluke's 5520A multiproduct calibrator to calibrate power quality instrumentation to the standards of the IEC and other regulatory agencies. Three precision waveform modes provide traceability for power meters, disturbance analysers, power quality monitors, recorders and other power quality related equipment.

The 5520A portable calibrator can be used both in the field and on the bench. It also allows for matching of configurations to workload as well as the adding of options as workloads change and grow.

The three power quality waveform modes in the 5520A-PQ include: composite harmonic, flicker simulation, and sags and swells simulation. These waveforms are available in either the single output mode (voltage or current) or dual output modes (voltage + current and voltage + voltage). The modes provide traceability for harmonic analysis, flicker, and sags and swells functions of power quality measurement instruments.

Composite Harmonic mode

This mode outputs a user-defined waveform with up to 15 harmonics, from the second up to the sixty-third, which are combined with the fundamental. Both amplitude and phase of each harmonic, relative to the fundamental, can be specified. In the dual output modes (voltage + current and voltage + voltage), the wave shapes are independent of each other, but synchronised in time with 0,01 ­ phase resolution. Up to two user-defined waveforms can be stored in non-volatile memory for easy recall. Two IEC 10003-2 waveforms (Class A and Class D current harmonic limits) are pre-defined for CE compliance testing.

Flicker mode

Flicker simulation performs either a rectangular or sinewave amplitude modulation of the voltage or current output. The repeat frequency or repetition rate of the flicker event is programmable from 0,1 Hz to 30,0 Hz. The duty cycle of the flicker event relative to the nominal amplitude is programmable, giving true modulation of the output signal. The amplitude of the flicker event is programmable from ±100,0 % of the base waveform in 0,01% increments. To check the EN 61000-415 flicker function of power quality analysers, six combinations of delta voltages and change frequencies are provided to quickly check for a Pst (Perceptibility short term) of 1.

Sags and swells mode

Sags and swells simulation performs a one-time amplitude modulation of the voltage or current output. The amplitude is programmable from ±100 % of the base waveform. The duration of the sag (also referred to as dip) or swell is adjustable from 0,005 to 60,000 seconds. The ramp period of the sag or swell may also be specified. The sag and swell event can be adjusted to occur from 0,0 to 99,999 seconds after the trigger event.

Powerful new functionality

Fundamental generation combined with up to 15 harmonics produces a 'multitone' output to verify the performance of harmonic analysers. Flicker simulation verifies performance as described in EN 61000-4-15. The improved phase uncertainty over the standard 5520A sinewave modes allows for calibrating higher precision wattmeters. Multiple 5520As can be phase-locked for polyphase power testing and also, performance verification of both three- and four-wire wattmeters is possible. Compensation for inductive loads available in all current output modes.



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