HT Instruments HT155 Integrating Class 1 Sound Level Meter

MEASUREMENT RANGE

• Type A weighting: 25 ÷ 140dB

• Type C weighting: 30 ÷ 140dB

• Type Z (linear) weighting: 35 ÷ 140dB

• Peak C SLM: 50 ÷ 143dB 

MICROPHONE: Pre-polarized condenser ½ “ with pre-amplifier; Nominal sensitivity (at reference conditions): 50mV/Pa; Frequency range: 10Hz ÷ 20kHz; Noise: < 16dB(A)

AC OUTPUT: Output ratio: 1mV AC / 0.1dB; Maximum output voltage: 3.2Vrms; Output impedance: 1kΩ

PC CONNECTION: mini-USB;   USB pen drive

Level linear range: >90dB

Resolution: 0.1dB (Statistic), 0.01dB (1/1 e 1/3 OCT)

Frequency range: 10Hz ÷ 20kHz (±0.2dB) ; 1Hz ÷ 23kHz (±1.0dB)

Range gain: -10dB, 0dB, 10dB, 20dB, 30dB, 40dB

Range control error: ≤ 0.1dB

Self-generated noise voltage: <4µV (1Hz ÷ 23kHz linear)

Background noise: <13dB(A), 15dB(C), 25dB(Z)

Total noise: <18dB(A), 23dB(C), 28dB(Z)

Measuring voltage range: 15µV ÷10V (TRMS)

Frequency weighting: A / C / Z

Time weighting: Fast, Slow, Impulse, Peak C+, Peak C-

A/D internal converter: 24 bit

Anti-aliasing filter: cut-off frequency 23.5kHz, attenuation 100dB

Sampling rate: 20.8µs (48kHz)

Intergration time: 1s ÷ 24h pre-defined or customized

Internal memory: 64kBytes flash memory

Data storage: max 128 groups / max 256 calibrations 

Accessories: 

SOUNDVIEW

Rigid case HT155

Wind protection

HT150

4x1.5V alkaline batteries type A LR06

ISO9000 calibration certificate

Power supply 100-240VAC/5VDC with USB output

Cavo micro USB per collegamento PC

USB Pen Drive (TRASCEND JF V30/2GB)

USB cable for connecting the Pen Drive to the device

Calibration certificate of sound level meter and calibrator

Batteries and user manual