Download Instruction Manual - Davis Instruments

Introduction
Congratulations on your purchase of the Extech HD400 Digital Light Meter. The HD400
measures illuminance in Lux and Foot candles (Fc). The HD400 includes a PC interface
TM
and Windows compatible software for real-time monitoring and storage of light level
data. This meter is shipped fully tested and calibrated and, with proper use, will provide
years of reliable service.
Features
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Precision instrumentation for the measurement of light illuminance
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Large, 4000 count, backlit LCD display with fast 40 segment bargraph
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Data Hold function
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Meets CIE Photopic spectral response
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Fully cosine corrected for angular incidence of light
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Automatic correction factoring for non-standard lighting types
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Stable, long-lasting silicon photo diode sensor with spectral response filter
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Fast responding
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High accuracy
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Automatic zero function
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Peak Hold function for capturing fast changes in light levels down to 10uS
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Auto power off after 20 minutes of inactivity
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Maximum and Minimum light level memory
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Relative reading feature
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USB PC Interface for Data acquisition
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Four (4) range levels
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Heavy Duty, rugged, double molded housing
2
HD400 – V2.0 – 5/08