Amprobe LM631A Digital Light Meter Amprobe LM631A, LM 631 A, LM-631-A

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Amprobe LM631A
Digital Light Meter

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Amprobe LM631A

Data Sheet

Features:

Measures wide range of light up to 20,000 fc or lux, front panel switchable
Accurate, high resolution of 0.01 fc/lux
Sensor dome has 45? attached cord
Built-in CIE spectrum curve for accurate human eye response
Peak hold and data hold
Large, 3-1/2 digit display with backlight feature
Meets CE EN61326-1 certification for safety ratings
No hassle one year warranty

Included Accessories:

Lens Cover
Batteries
Carrying Case
Users Manual

Description

This instrument is a portable, easy-to-use, 3-1/2-digit, compact sized digital light meter designed for simple one-hand operation reading in lux or fc units.

Pressing the PEAK button for more than 2 seconds turns the backlight on and off.

There is also an auxiliary output at the microphone jack (2.5 mm) connector that is active as long as the light meter is turned on.

Models, Options, & Accessories

Products	Availability	Price
LM631A DIGITAL LIGHT METER - Discontinued - suggested replacement: Extech LT300

Specifications

Display	31⁄2-digit (LCD) with maximum reading of 1999
Overrange	(OL) is displayed
Low Battery Indication	Change batteries immediately
Measurement Rate	2.5 times per second, nominal
Operating Environment	0°C to 50°C (32°F to 122°F) at < 75% R.H.
Storage Temperature	- 20°C to 60°C (- 4°F to 140°F), 0 to 80 % R.H. with batteries removed
Environment	Indoor use, altitude up to 2000 m
Battery	4 pieces 1.5 V (AAA size) UM-4, R03
Battery Life	200 hours carbon-zinc battery
Standby Current	<1 μA; Dimensions: 170 x 44 x 40 mm
Weight	220 g
Warranty	One-year

Mechanical Specifications (at 23°C±5°C, <75% R.H. non-condensing)
Function	Range
Visual Light Intensity
Ranges	20 lux, 200 lux, 2000 lux, 20000 lux 20 fc, 200 fc, 2000 fc, 20000 fc
Total Accuracy	For CIE standard illuminant A (2856K): ± ( 3 % rdg + 10 digits)
Temperature Coefficient	0.1 x (specified accuracy)/°C (< 18 °C or > 28 °C), 0.056 x (specified accuracy)/°F (< 64.4 °F or > 82.4 °F)
Resolution	0.01 lux; 0.01 fc
Spectral Response	CIE photopic – CIE standard illuminant A
Acceptance Angle	ƒ ’ 2 < 2 %; cosine corrected (150 °)
Peak Hold Response Time	>50 mS pulse light
Analog Output	1 mV = 1 lux or 10 mV = 1 fc, nominal, continuous output

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