Amprobe LM631A
Digital Light Meter

Measures wide range of light up to 20,000 fc or lux, front panel switchable
Sensor dome has 114 cm (45 in) 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
Rugged Valox® case

Amprobe LM631A Shown

Product Information

Datasheet 167 KB

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Compact, rugged, and simple to use, our light meters display light levels quickly and accurately in both foot-candles or lux. They quickly define the amount of light radiating from a source or measure the amount of light energy illuminating an object or field. Light meters can help to reduce the amount of waste light used in the office or home, measure light pollution outdoors, and ensure proper light levels for work areas.

Specifications (at 23°C±5°C, <75% R.H. non-condensing)
Visual Light Intensity
Range	20 lux, 200 lux, 2000 lux, 20000 lux
Range	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)
Temperature Coefficient	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
Measurement Rate	2.5 times per second, nominal
General Specifications
Display	3 1⁄2-digit (LCD) with maximum reading of 1999
Overrange	(OL) is displayed
Battery	4 pieces 1.5 V (AAA size) UM-4, R03
Battery Life	200 hours carbon-zinc battery
Power	Standard 9 V transistor battery
Low Battery Indication	Change batteries immediately
Operating Temperature	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
Standby Current	<1 μA; Dimensions: 170 x 44 x 40 mm
Dimensions (W x L x H)	183 x 79 x 38 mm (7.2 in x 3.1 in x 1.5 in)
Weight (incl. batteries)	311 g (11 oz.)

Ordering Information
Model	Description	Buy Online	List Price
LM631A	Amprobe LM631A Digital Light meter		$97.95 (Reg. $99.95)
Included Accessories
	1 - Manual	Included

Amprobe LM631ADigital Light Meter

Amprobe LM631A
Digital Light Meter