光 度 記錄器 經濟實用, 長時間記錄, 不需要紙張. 適用: 農業, 園藝, 花房, 環境, 工業, ..... 等 StowAway Light Intensity Logger The StowAway LI is designed as a reusable, inexpensive, general purpose light intensity logger. Start the logger, readout and plot the data with BoxCar® Pro for Windows or BoxCar Pro for Macintosh software. Features Calibration ranges from less than 0.001 lumens/square foot to over 1000 lumens/square foot Wide spectral response and wide dynamic range Two year battery life (user replaceable) Nonvolatile EEPROM memory retains data even when battery is removed Safe operating temperature range is -39°C to +75°C, non-condensing Small size: 1.8" wide x 1.9" tall x 0.6" thick and 0.9 oz. Sampling intervals from 0.5 seconds to 9.0 hours Data exportable to spreadsheet programs (Lotus, Excel, etc.) Blinking LED light confirms operation Memory configurations are 2K, 8K or 32K storing 1800, 7943 or 32,520 measurements Alarm indication Delayed launch (up to three months) Push button triggered start Multiple sampling with minimum, maximum or averaging Temperature dependence The StowAway LI is calibrated at room temperature. The logger will read high for temperatures below room temperature and low for temperatures above. The error is approximately a factor of two for every 25°C change. This means it will read a factor of two high at 0°C and a factor of two low at 50°C. Calibration The StowAway LI is roughly calibrated for incandescent sources. Full sunlight is about 10,000 lumens/square foot, office lighting is about 50 lumens/square foot, and full moonlight is about 0.03 lumens/ square foot. The StowAway LI's range goes from less than 0.001 lumens/square foot to about 1,000 lumens/square foot. Spectral response The sensitivity of the StowAway LI photo sensor extends into the near infrared as shown below. Although this is useful in many applications, it also means that the logger's responsitivity is strongly dependent on the spectral characteristics of the light it is measuring. For example, the logger will read about a factor ten low when reading fluorescent lighting. Angular dependence The angular dependence of the logger from 0° to 45° vertical resembles the curve for cosine. After 45° the curve drops off more rapidly. Ordering Information Description Part No. 2K StowAway Light Intensity logger (0.001 to ~1000 lumens/sq ft) SLA02 8K StowAway Light Intensity logger (0.001 to ~1000 lumens/sq ft) SLA08 32K StowAway Light Intensity logger (0.001 to ~1000 lumens/sq ft) SLA32 　 　 BoxCar Pro 4.0 Starter Kit (Windows) BCP4.0-ON BoxCar 3.7 Starter Kit (Windows) BC3.6-ON 　 　  HOBO Light Intensity  (0.01 to ~10,000 lumens/sq ft)