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LM631A Digital Light Meter |
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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.
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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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