HT157 is mobile integrating sound level meters Type (Class 1) which can be used to monitor the equivalent level of nose (Leq), measure Peak values, check soundproofing levels, acoustic pollution, etc.
Ii is also indicated for certification according to the Leg. Decrees currently in force as regards environmental noise measurements and in working environments. These devices have a wide measuring range (from 25 to 140dB) and multiple functions such as statistic analysis, 24H analysis, integration of Leq over time, which are indispensable elements when measuring.
These models also allows carrying out detailed analyses of spectrum components of noise using integrated octave-band filters and 1/3 octave-band filters (only HT157) and they are provided with an internal memory to save data and with a USB interface for transferring data to the PC through dedicated software in a Windows environment with possibility of numerical, graphic and statistic display. Sound level meters ape provided with a practical and resistant case with a mobile calibrator for preliminary checks before each measurement is carried out.
HT Instruments HT157 Digital Integrating Decibal Meter Class 1 25 to 140dB Sound
Device category (Class) Class 1 Noise measuring range 25 ÷ 140dB Noise measurement resolution 0.1 ÷ 0.01dB Frequency range 10kHz ÷ 20kHz Dynamic range 90dB Measurement of sound pressure level (SPL) Measurement of equivalent noise levels (Leq) Frequency weighting A/C/Z A/ Integration over time Fast/Slow/Impulse Integration with programmable period Peak measurements (Peak-, Peak+) Display of MAX/MIN values of SPL Statistic analysis of noise with "A" weighting SPL analysis in 24H Spectrum analysis with octave-band filter (1/1) 19Hz ÷ 16kHz Spectrum analysis with 1/3 octave-band filter Provided mobile calibrator Class 1 Manual calibration with trimmer Precise calibration with internal procedure Pre-polarized “1/2” condenser microphone AC and DC analogue outputs with 3.5mm jack Only AC Internal memory for data saving 128 Recalling of results on the display Mini-USB interface for PC connection Windows software for saved data analysis Display LCD 240 x 160 Display backlight Power supply Provided external power supply Reference standards IEC61672 Class 2 - IEC61620 Class 2 Size (LxWxH) (mm) 285 x 90 x 39 Weight in grams (batteries included) 500