ENGLISH User manual © Copyright HT ITALIA 2011 Release EN 1.
HT307 CONTENTS: 1. SAFETY PRECAUTIONS AND PROCEDURES ............................................................. 2 1.1. Preliminary ............................................................................................................ 2 1.2. During use ............................................................................................................. 2 1.3. After use ................................................................................................................ 2 2.
HT307 1. SAFETY PRECAUTIONS AND PROCEDURES For your own safety and to avoid damaging the instrument follow the procedures described in this instruction manual and read carefully all notes preceded by this symbol . Do not use the meter in presence of explosive gas (material), combustible gas (material), steam or dust. The followings symbols are used: Caution: refer to the instruction manual. An incorrect use may damage the luxmeter or its components. 1.1.
HT307 2. GENERAL DESCRIPTION HT307 is a precision digital illuminance meter for light measurements (lux, ft), complying with the CIE (International Commission on Illumination) spectral response. It’s fully cosine corrected for the angular incidence of light. Compact, tough and easy to handle. The photo detector is a very stable long-life silicon photodiode with spectral response filter. 2.1. FEATURES • Light measuring levels up to 200.000 lux / 20.000 fc. • High accuracy and rapid response.
HT307 2.2. INSTRUMENT DESCRIPTION LEGEND: HT307 Lux/fc light meter 7 1. LCD display with a maximum reading of 2000 points. Signs of measured values, unit function symbols and decimal points are displayed. 2. Power key: press it to turn ON or OFF the meter. 3. M/H key: press it to select the maximum, minimum or current reading. Press for more than 1 second to resume normal measurement. 4. Lx/Fc key: press it to express values in fc scale instead of lux (1 fc=10.76 lux). 5.
HT307 3. PREPARATION FOR USE 3.1. INITIAL This instrument was checked both mechanically and electrically prior to shipment. All possible cares and precautions were taken to let you receive the instrument in perfect conditions. Notwithstanding we suggest you to check it rapidly (eventual damages may have occurred during transport – if so please contact the local distributor from whom you bought the item). Make sure that all standard accessories mentioned in paragraph 6.3.1 are included.
HT307 4. OPERATING INSTRUCTIONS 4.1. MEASUREMENT DESCRIPTION 1. Press the power key “☉ ” to turn on the meter. 2. Press the “Lx/fc” key to select lux or fc measurement. 3. Remove the protection cap of the photo detector and expose it to the light source in horizontal position. Read the illuminance nominal value on the LCD display. 4. Wait for values to be stable on the display. Press “D-H” key to activate the DATA HOLD function blocking the result on the display.
HT307 6. TECHNICAL SPECIFICATIONS 6.1. CHARACTERISTICS Accuracy is referred to the following reference conditions: 23°C ± 5°C with RH < 70%. The luxmeter is calibrated with a standard incandescent lamp at color temperature 2856°K. Measuring range and accuracy 20 Range in lux 0.01 Resolution Accuracy 200 0.1 2000 1 ± (3% rdg) 20k 10 200k 100 20 200 2000 20k Range in fc 0.01 0.1 1 10 Resolution ± (3% rdg) Accuracy NOTE: 1fc=10.
HT307 6.1.3. General data Mechanical characteristics Size: Weight (including battery): 172(L) x 55(W) x 38(H)mm 7(L) x 2(W) x 1(H) inches about 250g (9 ounces) Supply Battery type: Low battery indication: Battery life: 1 battery 9V type 6LR61 " " is displayed when the battery is low about 200 hours (carbon zinc.) Display Characteristics: Sample rate: LCD, 2000 counts with “OL” indication 2.
HT307 7. SERVICE 7.1. WARRANTY CONDITIONS This instrument is guaranteed against material or production defects, in accordance with our general sales conditions. During the warranty period the manufacturer reserves the right to decide either to repair or replace the product. Should you need for any reason to return back the instrument for repair or replacement take prior agreements with the local distributor from whom you bought it.
HT307 8. APPENDIX A: RECOMMENDED ILLUMINATION Table 2 below shows the recommended illumination for different types of locations expressed in lux (to get values in footcandles divide by 10,76).
