Extech SDL400 Light Meters / Illuminance Meters – Minimum Illuminance: 0 Lux (Lx), Max Illuminance: 100000 Lux (Lx),

Extech SDL400 Light Meter / Datalogger

The SDL400 records data on an SD card in Excel format with date/time stamp for easy transfer to your PC. With a wide range to 10,000 Fc or 100k Lux, it provides cosine and color-corrected measurements using a precision silicon photo diode and spectral response filter.

Applications

• OSHA compliance for workplace lighting
• Adequate indoor lighting in stairwells
• Schools and other exam/testing areas
• Medical examination and surgical procedure areas
• University campuses, parking garages, and public areas
• Security lighting and ATM locations
• Computer and clean room lighting
• Photography, film, and videography
• Antiques, museum exhibits, and artwork

Additional Features

Offset adjustment can be used for zero function or to make relative measurements. Adjustable data sampling rate from 1 to 3600 seconds (1 hour) and can store 99 readings manually and 20 million readings via 2G SD card. Type K/J Thermocouple input for high temperature measurements. Large backlit LCD display. Record/Recall MIN, MAX, Data Hold and Auto power off. Built-in PC interface.

What Is a Light Meter?

A light meter measures the amount of visible light, also known as illumination, in a given area. For many meter brands, including Extech, illumination is expressed in units of measure called Lux (for metric) and foot-candles (used in the US). To use an Extech light meter, the sensor is placed on a tabletop or other surface in the area to be measured and the light level reading is indicated on the meter’s display.

There are many different types of lighting that can be measured. the most common are: sodium, tungsten, mercury, and fluorescent. The following list shows common applications for each lighting type.

• Sodium lighting: Highway, parking lots, security measurements
• Tungsten lighting: Sunlight and incandescent lighting measurements
• Mercury lighting: Highways, parking lots, stadiums
• Fluorescent lighting: Indoor lighting for workstations and store display areas