®
• 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 certi-
fication for safety ratings
• Shipped with carrying case,
lens cover, batteries and
manual
Model LM631
Digital Light Meter
This instrument is a portable, easy-touse, 31⁄2-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.
LM631 Specifications
(at 23°C±5°C, <75% R.H. non-condensing)
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 dgts)
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
The CIE photopic curve is an international standard for the color response of the average human eye.
CIE standard illuminant as a is defined as a gas-filled tungsten-filament lamp operating at a correlated
color temperature.
General 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; Auto Power
Off: Approximately 15 seconds; Standby Current: <1 µA; Dimensions: 170 x 44 x 40 mm; Weight: 220 g
including batteries; Warranty: One-year
Digital Meter
Test Equipment Depot
99 Washington Street
Melrose, MA 02176-6024
www.testequipmentdepot.com
800-517-8431
781-665-0780 FAX
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