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Fabricante

HV857

High Voltage EL Lamp Driver for Low Noise Applications

Supertex Inc 

HV857 Application Note

Audible Noise Measurement Setup:

The following setup was used to collect EL lamp audible noise data. An Oscilloscope/Spectrum analyzer was used to observe the

differential output waveform, audible noise level (in mV), and light output (in mV) of the EL lamp. The EL lamp is placed in the anechoic

chamber and a condenser microphone is placed 10mm away from the surface of the EL lamp.

Driver Measurement Test Setup

Oscilloscope/Spectrum

Analyzer

EL

Driver

+-

DC

Supply

Pneumatic

Supports

Soundproof Anechoic Chamber

EL Lamp

Opto-acoustic

Probe

10mm

10:1 probes

Signal Conditioner

A-weighting

filter

NC

Headphones

Scaling

Scaling

Low pass

filter

NC

Drawing not to scale

Opto-acoustic probe is battery powered

to minimize electrical noise.

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