Introducció
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.
Característiques principals:
- 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.
Informació de seguretat
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.
- No exposeu el dispositiu a temperatures extremes, humitat ni llum solar directa durant períodes prolongats.
- Mantingueu el dispositiu allunyat de camps electromagnètics forts.
- No intenteu obrir ni modificar el dispositiu. Envieu totes les tasques de manteniment a personal qualificat.
- Assegureu-vos que el compartiment de la bateria estigui ben tancat durant el funcionament.
- Eliminar les bateries segons la normativa local.
Contingut del paquet
Verifiqueu que tots els elements siguin presents al paquet:
- Extech HD400 Light Meter
- Light sensor with 3ft (1m) cable and protective cover
- Windows compatible software with USB cable
- Maletí de transport dur
- bateria de 9 V

Image: The Extech HD400 Light Meter shown with its light sensor, USB cable, software CD, and hard carrying case, illustrating the complete package contents.
Configuració
1. Instal·lació de la bateria
- Locate the battery compartment on the back of the HD400 meter.
- Obriu la tapa del compartiment de la bateria.
- Inseriu la pila de 9 V subministrada, respectant la polaritat correcta (+/-).
- Tanqueu bé la tapa del compartiment de la bateria.
2. Connecting the Light Sensor
- Connect the cable from the light sensor to the input jack located at the top of the HD400 meter.
- Assegureu-vos que la connexió sigui ferma.
- 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. Instal·lació de programari (opcional)
For data logging and analysis, install the Windows compatible software:
- Insert the software CD into your computer's CD-ROM drive.
- Seguiu les instruccions a la pantalla per completar la instal·lació.
- Connect the HD400 meter to your computer using the supplied USB cable.
- Refer to the software's help documentation for detailed usage instructions.
Instruccions de funcionament
Encès/Apagat
- Premeu el botó PODER botó per encendre o apagar el mesurador.
- The meter features an Auto Power Off (APO) function to conserve battery life.
Prendre mesures
- Ensure the light sensor is positioned in the area where light intensity is to be measured. The sensor should be facing the light source.
- 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.
Botons de funció
- UNITATS: Press to toggle between Foot-candles (Fc) and Lux units.
- GAMMA: 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.
- PIC: 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.
- MANTENIM: Freezes the current reading on the display. Press again to release.
- CONTROLLUMINAR: Press the light bulb icon button to turn the display backlight on or off for improved visibility in low-light conditions.
Manteniment
Neteja
- Wipe the meter and sensor with a dry, clean, soft cloth.
- No utilitzeu netejadors abrasius ni dissolvents.
- Keep the light sensor clean and free of dust or smudges to ensure accurate readings.
Canvi de bateria
When the battery indicator appears on the display, replace the 9V battery as described in the "Battery Installation" section under Setup.
Emmagatzematge
- 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.
Resolució de problemes
| Problema | Causa possible | Solució |
|---|---|---|
| El mesurador no s'encén. | Bateria morta o instal·lada incorrectament. | Substituïu la pila de 9 V, assegurant-vos de la polaritat correcta. |
| Lectures inexactes. | Dirty sensor; incorrect unit selected; sensor not properly positioned. | Clean the sensor; check UNITS setting; ensure sensor faces light source. |
| La pantalla mostra "OL" (sobrecàrrega). | Light intensity exceeds the current range. | Switch to a higher range using the RANGE button or move to a less intense light area. |
| Software connection issues. | Incorrect USB driver; faulty USB cable; software not installed correctly. | Reinstall USB drivers; try a different USB port/cable; reinstall software. |
Especificacions
| Especificació | Detall |
|---|---|
| Número de model | HD400 |
| Interval de mesura | Up to 40,000 Fc or 400,000 Lux |
| Tipus de sensor | Precision Silicon Photo Diode with Spectral Response Filter |
| Mostra | Gran LCD retroil·luminat amb gràfic de barres de 40 segments |
| Mode pic | 10mS capture |
| Font d'alimentació | Bateria de 9V (inclosa) |
| Dimensions del producte | 8.26 x 18.42 x 5.72 cm |
| Pes de l'article | 390 g |
| Fabricant | FLIR SYSTEMS, INC. |
Garantia i Suport
For warranty information and technical support, please refer to the documentation provided with your product or visit the official Extech weblloc web. Conserveu el rebut de compra com a comprovant de compra per a reclamacions de garantia.
Extech is a brand of FLIR Systems, Inc.





