ENGLISH User manual Copyright HT ITALIA 2012 Release EN 1.
HT309 TABLE OF CONTENTS: 1. PRECAUTIONS AND SAFETY MEASURES .................................................................. 2 1.1. Preliminary instructions ......................................................................................... 2 1.2. During use ............................................................................................................. 2 1.3. After use ................................................................................................................ 2 2.
HT309 1. PRECAUTIONS AND SAFETY MEASURES The instrument has been designed in compliance with the safety directives relevant to electronic measuring instruments. In order to prevent damaging the instrument, please carefully follow the procedures described in this manual and read all notes preceded by the symbol with the utmost attention.
HT309 2. GENERAL DESCRIPTION The instrument HT309 is a precision digital luxmeter, mainly used for measuring illuminance of both white light sources and LED sources of various colours, expressed in Lux (Lx) or Foot-candles (Fc). The instrument complies with CIE (International Commission on Illumination) standards on spectrum response and corrects according to the cosine of the angle of incidence of light. The silicon photodiode sensor guarantees measurement stability.
HT309 4. OPERATING INSTRUCTIONS 4.1. INSTRUMENT DESCRIPTION CAPTION: 1. 2. 3. 4. 5. 6. 7. 8. 9. Fig. 1: Instrument description EN - 4 LCD display LX/FC/CD key MEM/READ key S arrow key (ON/OFF) / (Auto Power OFF) key ZERO key HOLD/L.S.
HT309 4.2. DESCRIPTION OF FUNCTION KEYS Some of the function keys on the front panel have a double function, which can be activated by pressing and holding the key for more than 1 second. 4.2.1. HOLD/L.S. (Light Source) key ¾ Press the HOLD/L.S key to freeze the value of the measured quantity on the display. The symbol “HOLD” appears on the display. Press the HOLD/L.S. key again to exit the function. ¾ Press and hold the HOLD/L.S. key for more than 1 second to select the light source to be measured.
HT309 4.2.3. MEM/READ key ¾ Press the MEM/READ key to save the datum shown on the display in the internal memory. The indication of the memory location (max. 99 locations) and the symbol “M” appear at the bottom of the display on the left. The control is not active when the HOLD function is activated. With activated “AVG” function, pressing the MEM/READ key saves the average (AVG) value of the datum on the display in the memory.
HT309 4.3. MEASURING OPERATIONS 4.3.1. 1. 2. 3. 4. 5. 6. 7. 8. 9. Illuminance measurement Insert the protection cover onto the photodiode sensor. Switch on the instrument using the ON/OFF key. If necessary, zero the display by pressing the ZERO key (see § 4.2.7). Select the measuring unit Lux or Fc on the instrument by pressing the LX/FC/CD key (see § 4.2.2). Select the type of source to be tested by pressing and holding the HOLD/L.S. key for more than 1 second (see § 4.2.1). Standard source is type “L0”.
HT309 5. MAINTENANCE CAUTION • • • Only expert and trained technicians should perform maintenance operations. Before carrying out maintenance operations, disconnect all cables from the input terminals. Do not use the instrument in environments with high humidity levels or high temperatures. Do not expose to direct sunlight. Always switch off the instrument after use.
HT309 6. TECHNICAL SPECIFICATIONS 6.1. TECHNICAL CHARACTERISTICS Accuracy is referred to the following reference conditions: temperature 23°C ± 5°C with relative humidity < 70%RH. The instrument is calibrated for a standard white light source consisting of an incandescent lamp, at a temperature/colour of 2856°K in compliance with Class A.
HT309 6.1.3. General characteristics Mechanical characteristics Size (LxWxH): Sensor size (LxWxH): Cable length: Weight (battery included): 130x55x38mm (5x2x1 in) 80x55x25mm (3x2x1 in) approx 1.5m (39 in) 250g (9 ounces) Power supply Battery type: Low battery indication: Battery life: 1x9V battery type NEDA 1604 IEC 6F22 the display shows symbol “ ” approx.
HT309 7. SERVICE 7.1. WARRANTY CONDITIONS This instrument is warranted against any material or manufacturing defect, in compliance with the general sales conditions. During the warranty period, defective parts may be replaced. However, the manufacturer reserves the right to repair or replace the product. Should the instrument be returned to the After-sales Service or to a Dealer, transport will be at the Customer’s charge. However, shipment will be agreed in advance.
HT309 8. APPENDIX A: RECOMMENDED ILLUMINANCE LEVELS Reports the recommended illuminance values (expressed in Lux; divide by 10.
