Extech HD400 Light Meter User Manual

Introduction

The Extech HD400 is a robust light meter designed for accurate measurement of light intensity across a wide range. It utilizes a precision silicon photo diode and a spectral response filter to ensure cosine and color corrected measurements. This manual provides essential information for the proper setup, operation, and maintenance of your HD400 Light Meter.

Key Features:

• Large backlit LCD display with 40-segment bar graph for clear readings.
• Wide measurement range up to 40,000 Fc (Foot-candles) or 400,000 Lux.
• Cosine and color corrected measurements for high accuracy.
• Precision silicon photo diode and spectral response filter for reliable data.
• Peak mode (10mS) to capture the highest reading.
• Relative mode to indicate changes in light levels.

Safety Information

Please read and understand all safety instructions before operating the Extech HD400 Light Meter. Failure to follow these instructions may result in damage to the device or personal injury.

• Do not expose the device to extreme temperatures, humidity, or direct sunlight for prolonged periods.
• Keep the device away from strong electromagnetic fields.
• Do not attempt to open or modify the device. Refer all servicing to qualified personnel.
• Ensure the battery compartment is securely closed during operation.
• Dispose of batteries according to local regulations.

Package Contents

Verify that all items are present in the package:

• Extech HD400 Light Meter
• Light sensor with 3ft (1m) cable and protective cover
• Windows compatible software with USB cable
• Hard carrying case
• 9V battery

Image: The Extech HD400 Light Meter shown with its light sensor, USB cable, software CD, and hard carrying case, illustrating the complete package contents.

Setup

1. Battery Installation

1. Locate the battery compartment on the back of the HD400 meter.
2. Open the battery compartment cover.
3. Insert the supplied 9V battery, observing the correct polarity (+/-).
4. Close the battery compartment cover securely.

2. Connecting the Light Sensor

1. Connect the cable from the light sensor to the input jack located at the top of the HD400 meter.
2. Ensure the connection is firm.
3. Remove the protective cover from the light sensor before taking measurements.

Image: The Extech HD400 Light Meter with its light sensor connected via cable, ready for use. The main display shows a reading.

3. Software Installation (Optional)

For data logging and analysis, install the Windows compatible software:

1. Insert the software CD into your computer's CD-ROM drive.
2. Follow the on-screen instructions to complete the installation.
3. Connect the HD400 meter to your computer using the supplied USB cable.
4. Refer to the software's help documentation for detailed usage instructions.

Operating Instructions

Powering On/Off

• Press the POWER button to turn the meter on or off.
• The meter features an Auto Power Off (APO) function to conserve battery life.

Taking Measurements

1. Ensure the light sensor is positioned in the area where light intensity is to be measured. The sensor should be facing the light source.
2. The current light reading will be displayed on the large backlit LCD.

Image: A person holding the Extech HD400 Light Meter and its sensor to measure light levels in a stairwell, demonstrating typical usage.

Function Buttons

• UNITS: Press to toggle between Foot-candles (Fc) and Lux units.
• RANGE: Press to manually select the measurement range. The meter also has an auto-ranging feature.
• MAX/MIN: Press to display the maximum or minimum light reading recorded since the meter was powered on or the function was reset.
• PEAK: Activates Peak mode, capturing the highest reading over a 10mS period. Useful for measuring short light flashes.
• REL (Relative): Activates Relative mode. This sets the current reading as a reference point (zero), and subsequent readings show the deviation from this reference.
• HOLD: Freezes the current reading on the display. Press again to release.
• BACKLIGHT: Press the light bulb icon button to turn the display backlight on or off for improved visibility in low-light conditions.

Maintenance

Cleaning

• Wipe the meter and sensor with a dry, clean, soft cloth.
• Do not use abrasive cleaners or solvents.
• Keep the light sensor clean and free of dust or smudges to ensure accurate readings.

Battery Replacement

When the battery indicator appears on the display, replace the 9V battery as described in the "Battery Installation" section under Setup.

Storage

• If storing the meter for an extended period, remove the battery to prevent leakage.
• Store the meter in its hard carrying case in a cool, dry place, away from direct sunlight and extreme temperatures.

Troubleshooting

Specifications

Warranty and Support

For warranty information and technical support, please refer to the documentation provided with your product or visit the official Extech website. Keep your purchase receipt as proof of purchase for warranty claims.

Extech is a brand of FLIR Systems, Inc.