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Civil structure monitoring solution by HBM

Technical Note
Which force transducer to go for - piezoelectric or strain gauge?
Strain gauge type force transducer (load cell) can measure static and dynamic loading, but  piezoelectric PE force transducer is designed for dynamic or quasi-static loading. There are some benefits of using PE force transducer:

Wide Measurement Range : PE force transducers cover the linear range of several load cells. They are able to zoom in the working range up to 1,000 times or more.

Sensitivity Stability : PE force transducers are constructed of solid state component. They don't exhibit aging effect.

Life Cycle Cost : PE force transducers last longer due to their stiffess. They needs to be calibrated less compared to strain gauges.

Learn more about PCB PE force transducer
Learn more about HBM SG force transducer
PCB accelerometer, microphone product finder

New product
Portable BraggMETER: Optical Interrogator

FS42 Portable BraggMETER is an optical interrogator with embedded software specifically designed to interrogate Fiber Bragg Grating (FBG) based optical sensors for measurement of strain, vibration, temperature & tilt on field.

With a built-in touchscreen interface and rechargeable batteries operation this is a unique product in the market that perfectly fits on site installation activities or short tests.

Learn more about HBM Portable BraggMETER

PCB microphone handbook - microphone technology

Technical Note
What is the maximum cable length for noise measurement?
based on 50mV/Pa Microphone and ICP preamplifier with 2mA supply

To answer this correctly, additional information is required. Cable length is dependent upon a number of factors. The capacitance of the cable in picofarads per foot (pF/ft), sensitivity (mV/Pa) of the microphone, maximum sound pressure level in decibels (dB) , frequency (Hz) range being measured and constant current (mA) level being supplied, all have an effect on what length of cable can be used.

As a benefit of the design, the prepolarized or ICP® style of microphones and preamplifiers allow for use of coaxial cables. Coaxial cables are cost efficient and will exhibit minimal signal loss over long cables lengths. For example: a 50 mV/Pa microphone, measuring 140 dB with a hundred feet of 29 pF cable can only measure up to 9.7 kHz. Increase the constant current to 4 mA and the microphone can measure up to 25 kHz.

The maximum SPL has a significant effect. By reducing the SPL to 120 dB and using a 2 mA of ICP® sensor power, approximately 500 feet of cable can be used get to over 19 kHz.

Learn more about PCB microphone

Product Profolio
Class 1 Sound Level Meter
Noise Dosimeter
Noise Analyzer 1/1, 1/3 Oct
Permannent Noise Monitoring 
NC, NR, STI, Reverberation Time
Outdoor Microphone
Noise Mapping
Data Acquistion System
Sound Calibrator
Audiometer Calibration System
Acoustics Coupler
ISO 10816-1 Vibration Meter
Vibration Analyzer
Vibration Data Collector
Vibration Monitoring System
Vibration Transmitter 4-20 mA
Vibration Indicator
On-line Vibration Monitoring
Vibration Switch

Modal Analysis System
Vibration Controller
Vibration Testing System

Shaker, Exciter
Vibration Calibrator
Ground Vibration Monitor
Impact Hammer
Pressure Transducer
Strain Gage

Load Cell
Force Transducer
Torque Transducer
Displacement Transducer

ICP Signal Conditoner
Bridge Signal Conditoner
Measuring Amplifier

High Voltage Testing
High Speed Electrial Power Measuring System

iTestMeasure Co. Ltd.
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Featured Products : 831 Sound Level Meter; Vibro M Vibration Meter / Analyzer
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