Extech Instruments 401025 User manual

USER MANUAL

Model 401025

Digital Light Meter

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Introduction

Congratulations on your purchase of the Extech Digital Light Meter. This device is shipped fully tested

and calibrated and, with proper use, will provide years of reliable service. Please visit our website

check for the latest version of this User Guide, Product Updates, and Customer

Support.

Meter Description

1. LCD Display

2. Data Hold Switch

3. Power Off/Range Switch

4. Analog Output Terminal

5. Battery Compartment (rear)

6. LUX/Fc Switch & Response Switch

7. Light Sensor

8. Zero adjust

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Lux

Operation

1. Select Units (Lux or Ft-candle) and the Response Time (Fast/Slow) using the slide switch. Typical

selection is Slow and Fc using the gray lettering.

2. Select the maximum range using the Range Switch.

3. Hold the Light Sensor so that the sensor faces the light source to be measured.

4. The display will indicate measured values. Use a range display multiplier if on the Lux 20,000 and

50,000 ranges or on the Fc 5000 range (see notes below).

5. To hold (freeze) a measurement, slide the Data Hold Switch to the Hold position. The reading will

freeze in the display until the Data Hold Switch is released.

Note 1: An Over Range indication is a display of "1__ ". If this occurs, switch to a higher range.

Note 2: For measurements made on the Fc 5000 range, the displayed reading must be multiplied by

10.

Note 3: For measurements made on the Lux 20000 or 50000 ranges the displayed reading must be

multiplied by 10 and 100 respectively.

Note 4: The meter will indicate values above the maximum ranges. The accuracy of these

measurements is unknown.

Range Display Multipliers

Range Units Multiplier

200 Fc Direct reading

2000 Fc & Lux Direct reading

5000 Fc Reading x10

20,000 Lux Reading x10

50,000 Lux Reading x100

Example: If a measurement on the 5000 Fc range displays 350 the actual measured value is:

350 x 10 = 3500 Fc.

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Selecting a Measurement Range

The meter has three measurement ranges for each unit of measure (0-200, 0-2000, and 0-5000 Fc)

and (0-2000, 0-20000, and 0-50000) Lux). The proper range selection will produce the most accurate

reading. Always select the range that produces the maximum number of digits without exceeding the

maximum count for that particular range. For example, a reading of 1456 Fc should be read on the 0

- 2000 range, not the 0-5000 range.

Zero procedure

The meter zero (display with no light input) may change with time. Occasional checking and

adjustment may be required.

1. Completely cover the sensor to block out any light.

2. Set the range switch to the lowest Lux or Fc range.

3. Using a small screwdriver, adjust the Zero control for a zero display. The last digit may

change slightly. This is normal and does not affect the accuracy of the meter.

Analog Output

The analog output jacks on the front panel produce a 0.1mV DC per digit signal that can be used for

recording or datalogging purposes.

Lighting Type Correction Factors

The 401025 light meter is calibrated under a precise Standard tungsten light source of 2856OK. If the

meter is to be used under a different type of light the correction factor of from the table below should

be applied to the readings obtained.

Mercury Lamp x1.14

Fluorescent Lamp X0.92 to 1.12

Daylight x1.00

Sodium x1.22

Metal Halide x1.00

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Replacing the Battery

When the left corner of the LCD display shows LO BAT the battery output is below the design limit and

the battery needs to be replaced. However, reliable measurement can still be taken for several hours

before the tester becomes inaccurate or switches off.

1. Open the Battery Cover at the back of the tester and remove the old battery.

2. Replace with a new 9V battery and install the cover securely.

Never dispose of used batteries or rechargeable batteries in household waste.

As consumers, users are legally required to take used batteries to appropriate

collection sites, the retail store where the batteries were purchased, or wherever

batteries are sold.

Disposal: Do not dispose of this instrument in household waste. The user is obligated to take end-of-

life devices to a designated collection point for the disposal of electrical and electronic equipment.

Specifications

General Specifications

Display 13mm (0.5") LCD (Liquid Crystal Display)

Measurement types Lux, Ft-candles (Fc)

Ranges

(see range table

below)

Lux: 0 to 50,000 Lux in 3 ranges

Foot-candles: 0-5,000 Fc in 3 ranges

Sensor Exclusive photo diode & color correction filter, spectrum

designed to meet C. I. E.

Zero Adjust Manual adjustment

Sampling Time Approx. 0.4 seconds

Response Time Fast: 0.4 seconds; Slow: 2 seconds

Over input indication Indication of "1__"

Analog Output 0.1 mV/1 digit (maximum output: 200mV)

Operating Temperature 0OC to 50OC (32OF to 122OF)

Operating Humidity Less than 80% RH

Power Supply 9V DC battery

Power Current Approx. 2 mA DC

Weight 220 g (0.52 lbs.)

Dimensions Main instrument: 163 x 70 x 30 mm (6.4 x 2.8 x

Sensor Probe: 85 x 55 x 12 mm (3.2 x 2.2 x

Optional Accessories Vinyl pouch carrying case (Part Number 409996)

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Range Specifications

Lux

Range In-range Display Resolution Accuracy (FS)

2,000 Lux 0-1,999 Lux 1 Lux ± (5% + 2digits)

20,000 Lux 2,000-19,990 Lux 10 Lux ± (5 % + 2digits)

50,000 Lux 20,000-50,000 Lux 100 Lux ±(5 % + 2digits)

Foot-candle (Fc)

Range In-range Display Resolution Accuracy (FS)

200 Fc 0-199.9 Fc 0.1 Fc ± (5% + 2digits)

2,000 Fc 200-1,999 Fc 1 Fc ± (5% + 2digits)

5,000 Fc 2,000-5,000 Fc 10 Fc ± (5% + 2digits)

Frequency Spectrum

300 400 500 600 700 800

0.8

0.6

0.4

0.2

Wavelength (nm)

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Appendix A - Typical Light Levels

Lux Foot

Candles

Lux Foot

Candles

Factories

Home

20-75 2-7 Emergency Stairs,

Warehouse

100-150 10-15 Washing

75-150 7-15 Exit/Entrance Passages 150-200 15-20 Recreational

Activities

150-300 15-30 Packing Work 200-300 20-30 Drawing Room,

Table

300-750 30-75 Visual Work: Production

Line

300-500 30-50 Makeup

750-1,500 75-150 Typesetting: Inspection

Work

500-1,500 50-150 Reading, Study

1,500-

3,000

150-300 Electronic Assembly,

Drafting

1,000-

2,000

100-200 Sewing

Office

Restaurant

75-100 7-10 Indoor Emergency Stairs 75-150 7-15 Corridor Stairs

100-200 10-20 Corridor Stairs 150-300 15-30 Entrance, Wash

Room

200-750 20-75 Conference, Reception

Room

300-750 30-75 Cooking/Dining

Room

750-1,500 75-150 Clerical Work 750-1,500 75-150 Show Window

1,500-

2,000

150-2000 Typing, Drafting

Store

Hospital

75-150 7-15 Indoors 30-75 3-7 Emergency Stairs

150-200 15-20 Corridor/Stairs 75-100 7-10 Stairs

200-300 20-30 Reception 100-150 10-15 Sick Room,

Warehouse

300-500 30-50 Display Stand 150-200 15-20 Waiting Room

500-750 50-75 Elevator 200-750 20-75 Medical Exam Room

750-1,500 75-150 Show Window, Packing

Table

750-1,500 75-150 Operating Room

1,500-

3,000

150-300 Storefront, Show Window 5,000-

10,000

500-1000 Eye Inspection

Appendix B - Common Terms and Conversion Factors

Illuminance (Visible Flux Density) 1 lm/m2=1 lux (lx)

10-4 lm/cm2

10-4 phot (ph)

9.290 x 10-2 lm/ft2

9.290 x 10-2 foot-candles

Luminance (Visible Flux Density per Solid Angle) 1 lm/m2/sr = 1 candela/m2

Luminous Intensity (Visible Flux per Solid Angle) 1 lm/sr = 1 candella

Luminous Flux ( Visible Flux) 1 lumen (lm) = 1.464 x 10-3 watts @ 555 nm

ISO-9001 Certified

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