Extech Instruments 401025 User Manual Download Page 5

401025-en-GB_v2.6   6/17 

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: 0.25 seconds; Slow: 1 second 

Over input indication 

Indication of "1__" 

Analog Output 

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

Operating Temperature 

0

O

C to 50

O

C (32

O

F to 122

O

F) 

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 1.2”) 

Sensor Probe: 85 x 55 x 12 mm (3.2 x 2.2 x 0.5”) 

Optional Accessories 

Vinyl pouch carrying case (Part Number 409996) 

Summary of Contents for 401025

Page 1: ...USER MANUAL Model 401025 Digital Light Meter Additional User Manual Translations available at www extech com ...

Page 2: ...proper use will provide years of reliable service Please visit our website www extech com to 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 ...

Page 3: ...ld 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 resp...

Page 4: ...d 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 o...

Page 5: ...er 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...

Page 6: ...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 1 0 8 0 6 0 4 0 2 0 Wavelength nm ...

Page 7: ...00 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 ...

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