Meter Description; Operation; Taking Measurements - Extech Instruments LT40 User Manual

Meter Description
Push‐Button Description
Operation
Power ON/OFF
Taking Measurements
Find Quality Products Online at:
1. Photo detector (remove protective cover to expose sensor)
2. Display (LCD)
3. Control push‐buttons
4. Power Button: ON/OFF
Battery compartment and tripod mount are located on
rear of instrument
1. Lux/Fc units selector
2. Zero Calibration button
3. Maximum/Average/Minimum memory button
4. Data hold button
Long press the Power button to power the meter. To power the meter OFF, short press the
Power button.
1. Switch the meter ON and remove the sensor's protective cover to expose the light sensor
dome. The display should switch ON; if not, check that batteries are installed and fresh.
2. The meter measures the intensity of the light (illuminance) that strikes the sensor dome in
foot‐candles and Lux units (1 fc = 10.76 lux), displaying this measured value on its LCD.
3. Position the meter and light source so that the light strikes the sensor dome straight on
(perpendicular) with as little an angle as possible.
4. The meter's display can show a value up to 9999. However, for readings that represent
measurements higher than this, the meter uses x10 or x100 feature. For example, to
represent a measurement of 11,000 fc the meter will display 1100 with the x10 indicator.
GlobalTestSupply
www.
3 LT40-en-GB_V3.0 10/17
.com
sales@GlobalTestSupply.com