ENGLISH User manual © Copyright HT ITALIA 2011 Release EN 1.
HT154 Table of contents: 1. SAFETY PRECAUTIONS AND PROCEDURES ............................................................. 2 1.1. Preliminary ................................................................................................................ 2 1.2. During Use ................................................................................................................ 2 1.3. After Use ...........................................................................................................
HT154 1. SAFETY PRECAUTIONS AND PROCEDURES This apparatus conforms to safety standard EN 61010-1, relating to electronic measuring instruments. For your own safety and that of the apparatus, you must follow the procedures described in this instruction manual and especially read all the notes preceded carefully. by the symbol Take extreme care for the following conditions when measuring: • Do not perform measurement under humid or wet environment.
HT154 1.3. AFTER USE • Once the measurements are completed, switch OFF the meter. • If the instruments is not be used for a long period, remove the battery. 2. GENERAL DESCRIPTION The meter can perform the herewith functions: ¾ Sound Pressure Level (SPL) measurements with 30dB to 130dB range. ¾ A or C frequency weighted measurements. ¾ FAST or SLOW integrations measurements. ¾ MAX and MIN value of SPL. ¾ AC or DC analogical outputs used with multimeters or external data loggers. ¾ Manual range selection.
HT154 3. PREPARATION FOR USE 3.1. INITIAL All the equipment has been checked mechanically and electrically prior to shipment. Every care has been taken to ensure that the instrument reaches you undamaged. However, it is wise to carry out a rapid check in order to detect any possible damage that might have been caused during transport. Should this be the case, immediately enter the usual claims with courier. Check the packaging contained according to packaging list reported in chapter 6.4.
HT154 4. OPERATING INSTRUCTIONS 4.1. INSTRUMENT DESCRIPTION 4.1.1. Commands description 8 1 3 HT154 Sound Level Meter 2 13 9 5 4 9V BATTERY NEDA 1604 6F22 006P 10 6 PLEASE READ MANUAL FOR SAFETY 11 12 7 14 LEGEND: 1. Windscreen 2. Display 3. Frequency A/C Weighing selector key 4. ON/OFF key 5. Level Range control key 6. MAX MIN key. 7. FAST/SLOW integration selector key 8. Microphone 9. CAL adjust trimmer 10. AC output terminal 11. DC output Terminal 12.
HT154 4.2. FUNCTION KEY DESCRIPTION 4.2.1. ON/OFF key Pressing of key permits to turn ON or switch OFF the meter in any moment. 4.2.2. A/C function key Using the A/C key it is possible to select the A or C frequency weighting: ¾ A weighting: Normally it is used for general sound level measurements. ¾ C weighting: Used for checking the low-frequency content of noise. 4.2.3.
HT154 4.3. MEASUREMENTS CAUTION Wind blowing across the microphone would bring additional extraneous noise. Once using the instrument in the presence of wind with speed higher than 10m/s, it is a must to mount the windscreen to not pick up undesirable signals. Keep the microphone dry and avoid sever vibration. 1. Turn ON the meter. 2. Performing calibration operation if the meter was not used for a long time using the standard portable calibrator (see chapter 4.3.2). 3.
HT154 4.3.2. Calibration procedure Portable calibrator Screwdriver HT154 Sound Level Meter Fig. 4: Connection of meter to portable calibrator HT150 1. Turn ON the meter. 2. Setting herewith configuration: Frequency Weighting: A (dBA) Integration time: FAST 3. Inserting with care the portable calibrator HT150 on meter microphone up to listen a click, as shown in Fig.4. 4. Pressing LEVEL key and selecting “50-100” range at display. 5. Turn ON calibrator and select 94dB level at 1kHz sinusoidal frequency.
HT154 5. MAINTENANCE 5.1. GENERAL INFORMATION This digital meter is a precision instrument. Whether in use or in storage, please do not exceed the specification requirements to avoid any possible damage or danger during use. Do not place this meter in high temperature or humidity or expose to direct sunlight. Be sure to turn the meter off after use. For long time storage, remove the battery to avoid leakage of battery liquid that would damage the interior parts. 5.2.
HT154 6. TECHNICAL SPECIFICATIONS 6.1. TECHNICAL CHARACTERISTICS Accuracy is referred to the herewith conditions: 23°C ± 5°C with <80% RH. • Sound Pressure Level (SPL) Range Lo 30 ÷80dB Med 50 ÷100dB Hi 80 ÷130dB • Dynamic range Resolution Accuracy Frequency range 50dB 0.1dB ±1.5dB 31.
HT154 6.3. ENVIRONMENTAL CONDITIONS 6.3.1. Climatic conditions Reference temperature: 23° ± 5°C; 73° ± 41°F Operating temperature: 5 ÷ 40 °C; 41 ÷ 104 °F Operating humidity: <80% RH Storage temperature: -10 ÷ 60 °C; 14 ÷ 140 °F Storage humidity: <70% RH 6.3.2. EMC This instrument complies with the requirements of European Directive EMC 2004/108/EC 6.4. ACCESSORIES 6.4.1.
HT154 7. SERVICE 7.1. WARRANTY CONDITIONS This instrument is guaranteed for one year 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.
