EXTECH 407227 User Guide
User's Guide
Heavy Duty Digital Light Meter
with PC Interface
Model HD400
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 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
Precision instrumentation for the measurement of light illuminance
Large, 4000 count, backlit LCD display with fast 40 segment bargraph
Data Hold function
Meets CIE Photopic spectral response
Fully cosine corrected for angular incidence of light
Stable, long-lasting silicon photo diode sensor with spectral response filter
Fast responding
High accuracy
Automatic zero function
Peak Hold function for capturing fast changes in light levels down to 10mS
Auto power off after 20 minutes of inactivity
Maximum and Minimum light level memory
Relative reading feature
USB PC Interface for Data acquisition
Four (4) range levels
Heavy Duty, rugged, double molded housing
TM
2
HD400-EU-EN-V2.3- 5/12
Description
Meter Description
1. Sensor cable plug shown connected to meter jack
2. USB jack for PC interface (under the flip-down cover)
3. LCD Display
4. Upper Push Button set
5. Lower Push Button set
6. Sensor’s light collector dome
7. Sensor housing (protective cover not shown)
8. Power ON-OFF button
NOTE
: The battery compartment, tripod mount, and tilt stand
are located on the rear of the instrument and are not
pictured
Display Description
1. Digital measurement reading
2. Bargraph measurement reading
3. Auto Power OFF active icon
4. MANU icon
5. DATA HOLD icon
6. RELATIVE mode icon
1
2
3
4
5
8
6
7
5678
4
3
2
7. MAXIMUM and MINIMUM reading mode
8. PEAK HOLD mode
9. Low Battery symbol
10. PC connection icon
11. Range units of measure
3
1
910 11
HD400-EU-EN-V2.3- 5/12
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