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CIE Photopic Curve
The CIE photopic curve is an international standard for the colour response of
the average human eye
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OPERATOR MAINTENANCE
Battery Replacement
Power is supplied by a 9 volt "transistor" battery. (NEDA1604, IEC 6F22). The
"
" appears on the LCD display when replacement is needed. To replace the
battery, remove the two screws from the back of the meter and lift off the battery
cover. Remove the battery from the battery contacts.
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Measurement rate: 2.5 times per second, nominal.
Operating Environment: 0°C to 50°C (32°F to 122°F) at< 70% relative humidity
Storage Temperature: -20°C to 60°C (-4°F to 140°F), 0 to 80% R.H. with battery
removed from meter
Accuracy: Stated accuracy at 23°C ± 5°C (73°F ± 9°F), <70% relative humidity
Battery: Standard 9V battery (NEDA 1604, IEC 6F22 006P)
Battery Life: 200 hours typical with carbon zinc battery
Dimensions (HxWxD): 190mm(H) x 65.5mm(W) x 35mm(D)
Weight: 210g including battery
ELECTRICAL
Photometric Formulas:
10.764·footcandles=lux(lumens/meter
0.0929·lux=footcandles(lumens/foot
Range LM90: 20lux, 200lux, 2000lux, 20klux
20fc, 200fc, 2000fc, 20kfc
Range LM92: 200lux, 2000lux, 20klux, 200klux
200fc, 2000fc, 20kfc, 200kfc
Resolution: 0.1lux, 0.1fc
Spectral response: CIE photopic
Acceptance angle: ƒ'2<3% cosine corrected (150°)
Total accuracy for CIE standard illuminant A (2856K): ±(3%rdg + 10dgts)
CIE standard illuminant A can be realised by means of CIE standard source A,
which is defined as: A gas-filled tungsten-filament lamp operating at a
correlated colour temperature of 2856K
Temperature Coefficient: 0.1x (specified accuracy)/°C (<18°C or >28°C),
0.056x(specified accuracy)/°F(<64.4°F or >82.4°F)
Peak Hold response time: >50mS pulse light.
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