Amprobe LM631A, User Manual, Page: 12 / 14

6
ELECTRICAL
Accuracy: at 23°C ± 5°C (73°F ± 9°F), < 75 % relative humidity
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: 0.1x (specified accuracy)/°C (< 18°C or >28 °C),
0.056 x(specified accuracy)/°F (< 64.4°F or > 82.4°F)
Resolution: 0.01lux; 0.01fc
Spectral response: CIE photopic – CIE standard illuminant A
Acceptance angle: ƒ ’
2
< 2 %; cosine corrected (150°)
Peak Hold response time: >50mS 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 A
is defined as: A gas- filled tungsten-filament lamp operating at a
correlated color temperature of 2856K.