Extech 401025 Operating Manual

User's Manual

Model 401025
Digital Light Meter

Introduction

Congratulations on your purchase of Extech’s Digital Light Meter. This professional meter,
with proper care, will provide years of safe reliable service.

Specifications

General Specifications

Display 0.5" (13 mm) LCD (Liquid Crystal Display).
Measurement Lux, Ft-candle (Fc).
Ranges Lux: 0 to 50,000 Lux, 3 ranges. Foot-candle: 0-5,000 Fc, 3

Sensor Exclusive photo diode & color correction filter, spectrum
Zero Adj. Manual adjustment.

Sampling Time Approx. 0.4 sec.
Response Time Fast: 0.25s; Slow: 1s
Over input indication Indication of "1 "
Analog Output 0.1 mV/1 digit, max. output :200mV.
Operating Temperature (32OF to 122OF).(0OC to 50OC).
Operating Humidity Less than 80% RH.
Power Supply 006P DC 9V battery
Power Current Approx. 2 mA DC
Weight 220 g / 0.52 LB
Dimension Main instrument: 6.4x2.8x1.2 inch (163x70x30mm).

Optional Accessories Vinyl pouch carrying case, 409996

Range Specifications

Lux
Range In-range Display Resolution Accuracy

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

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

1

0.8

0.6

0.4

0.2
0

300 400 500 600 700 800

ranges.
designed to meet C. I. E.

Sensor Probe: 3.2x2.2x0.5 inch (85x55x12 mm).

Wavelength (nm)

2

401025 Ver. 2.1 07/05