Martindale LM90 Light Meter

description

technical info

This light meter LM90 from Martindale resolves down to 0.01 lux making it ideal for use in very low light applications.

The handbook gives details of conversion factors for different light wavelengths allowing more accurate measurements.

The peak hold and the hold functions allow a maximum reading to be recorded or one particular result to be kept.

You can set the Martindale LM90 Lux Meter to show results in lux or foot candles.

Martindale LM90 Light Meter key features

Low battery indication
Peak / hold function
Lux and foot candles measurement units
Includes battery, carry case and user manual

Technical Data Section

Photometric Formulas: 10.764 foot candles = lux(lumens/meter2) 0.0929 lux = foot candles (lumens/foot2)
LM90 Range: 20lux, 200lux, 2000lux, 20klux, 20fc, 200fc, 2000fc, 20kfc
Resolution: 0.01 lux, 0.01 fc (LM90)
Spectral response: CIE photopic
Acceptance angle: ƒ'2<3% cosine corrected (150°)
Total accuracy for CIE standard illuminant A (2856K): ±(3%rdg + 10dgts)
Display: 3½ digit liquid crystal display (LCD) with maximum reading of 1999
Over range: (OL) is displayed
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
Temperature Coefficient: 0.1x (specified accuracy)/°C (<18°C or >28°C), 0.056x(specified accuracy)/°F(<64.4°F or >82.4°F)
Backlight display: yes
Battery: Standard 9V battery (NEDA 1604, IEC 6F22 006P)
Battery Life: 200 hours typical with carbon zinc battery
Dimensions: 190mm(H) x 65.5mm(W) x 35mm(D)
Weight: 210g including battery