Illumination/Light Meter (SM-851)


Illumination/Light Meter (SM-851)


Read the following safety information carefully before attempting to operate or service the meter. Use the meter only as specified in this manual otherwise, the protection provided by the meter may be impaired.


Environment Conditions: –

1. RH≤ 90% (Non-Condensation)

2. Operating Temperature: – 20C – 60C

3. Storage Temperature: – 20C – 60C


Maintenance: –

1. Repairs or services not covered in this manual should only be performed by qualified personnel.

2. Wipe the unit with a dry soft cloth. Do not use abrasives or solvents on this instrument.

Safety Symbol

1. Comply with EMC




This Light Meter is designed to meet the measurement requirements of safety Engineers, Health, Industrial safety offices, and light quality control in various environments like factories, schools, construction, etc.

1. Measuring range: 0Lux~400kLux/0Fc~40kFc (Measurement repeatability)
2. Analog bar-graph indication
3. Real-time and date display
4. High accuracy
5. Data hold
6. Meter corrected for spectral relative efficiency
7. Automatically revise parameters for standard illumination
8. Short rise and fall times
9. Selectable measuring units: Lux or Fc
10. Meter automatically shuts down after approx. 15 minutes of inactivity
11. MAX/MIN record
12. Large LCD display
13. Peak-hold
14. 4-level selectable measurement ranges
15. Automatic measurement
17 Low battery indication
Technical Specification 
Display 4 digits LCD display
Measuring range O Lux~400k Lux ; OFc ~ 40k Fc
Spectral response CIE photopis. (CIE human eye response curve)
Over range indication LCD displays “-OL-” or “-LO-“
Spectral accuracy CIE VA function (f1’≤6%,f2’≤2%)
Accuracy ±3% rdg±0.5%f.s.(<10,000Lux);

±4% rdg±10dgts.(>10,000Lux)

Sampling rate 2 times per second
Photodetector Silicon photo-diode with spectral response filter
Power supply One 9V battery, 006P, NEDA 1604 or IEC6F22
Photodetector Lead Length approx. 2.5m
Dimension (L x W x H) 185 x 66  x 33(mm)
Weight 308g


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