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Extech Instruments LT40

Extech Instruments LT40
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USERGUIDE
WhiteLEDLightMeter
ModelLT40

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Extech Instruments LT40 Specifications

General IconGeneral
TypeLight Meter
Sampling Rate2.5 times per second
Light TypeVisible light
Accuracy (Light)±5%rdg
SensorSilicon photodiode and filter
DisplayLCD with backlight
Operating Temperature0 to 50°C (32 to 122°F)
Battery9V battery

Summary

Introduction

Features

Meter Description

Push-Button Description

Operation

Taking Measurements

Procedure for measuring light intensity using the meter, including sensor positioning and display interpretation.

Auto Power Off

Information on the automatic power-down feature to conserve battery life and how to manage it.

LUXFC Button

How to switch between Lux and Foot-candle measurement units using the dedicated button.

Advanced Functions

MAXMIN Button

How to record and display maximum, average, and minimum measured light values.

Data Hold Button

Function to freeze the current reading on the LCD display.

Calibration

1000 LUX Calibration

Steps to calibrate the meter using a 1000 Lux light source for accurate readings.

ZERO Calibration

Procedure to perform zero adjustment on the meter, ensuring accurate baseline measurements.

Measurement Tips and Maintenance

Measurement Considerations and User Tips

Guidance for accurate measurements and general tips for using the light meter effectively.

Battery Replacement and Maintenance

Instructions for cleaning, storing, and replacing batteries for optimal meter performance.

Specifications

General Specifications

Appendices

Typical Light Levels

Provides reference Lux and Foot-candle levels for various environments and activities.

Spectral Sensitivity

Details the meter's spectral response curve and its deviation from luminosity standards.

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