High accuracy calibration and use of power analysers for measurement of solid-state lighting devices

Abstract

One of the key parameters in the photometry of solid-state lighting is the measurement of the luminous efficacy of the device under test. This parameter requires not only accurate photometric measurements, but also accurate measurement of the electrical parameters of the device. It has become apparent that high-accuracy electrical measurements of lighting devices and solid-state lighting devices, in particular, are subject to much greater errors when the current waveform departs from a pure sinusoidal waveform. Key aspects influencing this are the calibration of the power analyser used for the measurement and the wiring arrangement used during the measurement. This paper describes a method of waveform-specific calibration for power analysers, and a simple, common error used in the wiring setup, which can result in significant errors.

Power Quality and Energy Efficiency in the Pre-Evaluation of an Outdoor Lighting Renewal with Light-Emitting Diode Technology: Experimental Study and Amortization Analysis

“…Consequently, power analyzers with low bandwidth, non-continuous or an inadequately sampled current waveform will have difficulty in accurately profiling the current waveform when measuring SSL devices. [33] state that "many SSL devices produce highly distorted current waveforms and harmonic content well into the hundreds of kilohertz" and "additional distortion of the waveform can also be introduced when dimming the SSL device". Consequently, power analyzers with low bandwidth, non-continuous or an inadequately sampled current waveform will have difficulty in accurately profiling the current waveform when measuring SSL devices.…”

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