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LM-631A Digital Light Meter |
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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.
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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.
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Specifications
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Function |
Range |
Accuracy |
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Visual Light Intensity |
20 lux, 200 lux, 2000 lux, 20,000 lux 20
fc, 200 fc, 2000 fc, 20,000 fc |
±(3% of Rdg + 10
digits) for CIE std. illuminant 'A' (2856K) |
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Temperature Coefficient
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0.1 x (specified accuracy)/°C
(<18°C or >28°C),
0.056 x (specified accuracy)/°F (<64.4°F or >82.4°F) |
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Resolution |
0.01 lux; 0.01 fc |
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Spectral Response |
CIE Photopic - CIE standard illuminant A |
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Acceptance Angle |
f ' 2<2%; cosine corrected (150°) |
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Peak Hold Response Time |
>50mS pulse light |
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Analog Output |
1mV = 1 lux or 10mV = 1 fc, nominal
continuous output |
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The CIE Photopic curve is an international standard for the color response
of the average human eye. CIE standard illuminate is defined as a
gas-filled tungsten-filament lamp operating at a correlated color
temperature.
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General Specifications
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Display |
3-1/2 digit (LCD) with maximum reading
of 1999 |
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Overrange |
(OL) is displayed |
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Low Battery Indication |
Change battery immediately |
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Measurement Rate |
2.5 times per second, nominal |
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Operating Temperature |
0°C to 50°C (32°F
to 122°F) at <75% R.H. |
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Storage Temperature |
-20°C to 60°C (-4°F
to 140°F) 0 to 80% R.H. with batteries removed |
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Power Supply |
4 pieces 1.5V size 'AAA' type UM-4, R03
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Battery Life |
200-hours carbon-zinc battery |
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Standby Current |
<1µA |
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Dimensions |
170mm (L) x 44mm (W) x 40mm (D) |
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Weight |
220g |
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Warranty |
One-year |
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Included Accessories |
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Complete with Carrying Case,9V
battery installed, Lens Cover and Users Manual. |
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