DIGITAL LIGHT METER
TABLE OF CONTENTS 1. FEATURES................................................................... 1 2. SPECIFICATIONS......................................................... 1 2-1 General Specifications.............................................1 2-2 Electrical Specifications........................................... 3 3. FRONT PANEL DESCRIPTION........................................4 3-1 Display................................................................. 4 3-2 Power Off/On Button..................
1. FEATURES * Microprocessor circuit ensure high accuracy, and also and also provides special functions and features. * Super large LCD display with contrast adjustment for best viewing angle. * Dual function display. * Heavy duty & compact case. * Records Maximum, Minimum and Average readings. * Data hold. * Auto power off saves battery life. * Operates from 9V battery. * RS 232 PC serial interface. * Spectrum of photo sensor meets C.I.E.. * Wide range measurement both for LUX & Foot Candle units.
Measurement LUX & ranges Foot-candle 0 - 50,000 LUX, 3 ranges. 0 -5,000 Ft-cd, 3 ranges. Relativity 0 to 1999 %. (Relative to the range selected and the measured value) Sensor The exclusive photo diode & color correction filter, spectrum designed to meet C. I. E. Memory Records Maximum, Minimum and Average Recall readings with RECALL facilities. Sample Time Approx. 0.4 sec. Zero Adj. By push button. Power off Manual off by push button, or Auto shut off after 10 minutes.
2-2 Electrical Specifications (23 5 蚓) Measurement LUX Foot-candle Range 2,000 Lux 20,000 Lux 50,000 Lux 200 Ft-cd 2,000 Ft-cd 5,000 Ft-cd Max. In-range Display 0 - 1,999 Lux 1,800 - 19,990 Lux 18,000 - 50,000 Lux 0 - 186.0 Ft-cd 167 - 1,860 Ft-cd 1,670 - 5,000 Ft-cd Range Resolution Accuracy 2,000 LUX 1 Lux 20,000 LUX 10 Lux 50,000 LUX 100 Lux 4 % + 2 dgt) 200 Ft-cd 0.1 Ft-cd 2,000 Ft-cd 1 Ft-cd 5,000 Ft-cd 10 Ft-cd Note : Accuracy tested by a standard parallel light tungsten lamp of 2856 袁 temperature.
3. FRONT PANEL DESCRIPTION Fig.
4. MEASURING PROCEDURE (1) Push the "Power Off/On Button"(3-2, Fig. 1) to switch the instrument on. (2) Zero Adjust Procedures * Cover the Light Sensor(3-12, Fig, 1) using the Sensor Cover provided (3-13, Fig. 1). * Slide the "Range Switch"(3-11, Fig. 1) to the 2000 LUX position. * Push the "Zero Button"(3-9, Fig. 1), then display will show zero values. * Upon completion, remove the sensor cover. (2) Select the desired measuring unit by pressing the "LUX/FC Button"(3-4, Fig. 1).
(6) * On the 20000 LUX range, the last digit will be shown on the lower line of LCD display. * On the 50000 LUX range, the last two digits will show on the lower line of LCD display. * For example : On the 20000 range, if the display sho1562 LUX 0 that means the real display is 15620 LUX. * Please note the digits on the lower display are multipliers only (i.e. x10 & x 100 respectively). These digits will not change, and will only inducate 0.
(9) Data Record( Max., Min., Average reading) * The DATA RECORD function displays the maximum, minimum and average readings. To start the DATA RECORD function, press the "Record Button"(3-6, Fig. 1) once. "REC" marker will appear on the LCD display. * With the "REC" symbol indicated on the display (a) Push the "CALL Button"(3-7, Fig. 1) once, then the "Max" symbol with the maximum values recorded will appear on the LCD display.
Optional measuring procedures : DATA HOLD MEMORY RECORD Max., Min. AVG RS232 OUTPUT Power management AUTO POWER OFF (Not activated during Memory Record Selection) or MANUAL POWER OFF under memory record function 5. ADDITIONAL FEATURES (a) The instrument has built-in "Auto Power Shut-off" in order to prolong battery life. The meter will switch off automatically if none of the buttons are pressed within 10 min.
An RS232 lead with the following connection will be required to link the instrument with the PC serial input. Meter (3.5 mm jack plug) PC (9W 'D" Connector) Center Pin...................................... Pin 2 Ground/shield....................................
7. BATTERY REPLACEMENT (1) When the left corner of LCD display show "LBT", it is necessary to replace the battery. However, in-spec measurement may still be made for several hours after low battery indicator appears before the instrument become inaccurate. (2) Slide the Battery Cover(3-17, Fig. 1) away from the instrument and remove the battery. (3) Install a 9V battery(PP3 type) and replace the cover.
