Measuring Shock and Vibration

Analog signal conditioning for accurate shock and vibration measurements

 

It’s not easy to collect valid data for shock measurements. The measurement system itself may contaminate the spectrally rich data. To avoid clipping, the amplifier must have sufficient gain for in-band signals while leaving headroom for out-band signals. The signal conditioner requires a suitable slew rate to avoid signal distortion on the waveforms’ sharp edges. The low-pass filter characteristics must be thoroughly understood so the filter can faithfully pass signals of interest, attenuate transducer resonances, avoid aliasing—and ultimately collect valid time-domain data.

Precision Filters offers signal conditioners specifically designed to maximize accuracy when measuring shock and vibration. Three amplifiers—the 28144, 28304, and 28608B—all feature a high slew rate, wide bandwidth, and sharp programmable filtering. Gain is distributed before and after the filter, so you can attenuate the resonant frequency of the sensor before amplification of the in-band signal. This optimizes signal-to-noise ratio for pyroshock measurements. Equipped with Precision’s FLAT/PULSE filter technology, these amplifiers provide outstanding response for applications REZCOMP™ extends frequency responsein either the time domain or the frequency domain. REZCOMP™ sensor resonance compensation technology increases sensor bandwidth without affecting rise time.

The slew limiter reduces out-band content such that the signal at the output of the pre-filter gain stage.

Using distributed gain to avoid clipping on accelerometer resonance.

Testing for shock is expensive, and you often have just one chance to get it right. Precision Filters builds confidence into your testing with automated tests that verify sensor and cable health. Prefilter overload detection helps to ensure your data is valid.


Amplifiers for Shock and Vibration

Precision Filters’ suite of conditioning cards for shock measurement provides solutions for strain and bridge sensors (28144), charge and IEPE accelerometers (28304) and low-level voltage inputs (28608B).

28144
Strain/Bridge Conditioner

28458 Dynamic Strain Conditioner
  • 4-channels/ card,
    64-channels/ system
  • Excitation: Balanced Constant Current™
    or constant voltage
  • REZCOMP™ technology to extend frequency response of accelerometer, microphone and pressure sensor measurements

View 28144 Spec Sheet

28304
Charge/IEPE Conditioner
28144 Strain/Bridge Conditioner w/ LDTEDS™

  • 4-channels/ card,
    64-channels/ system
  • Dual mode: IEPE or charge
  • REZCOMP™ technology to extend frequency response of accelerometer, microphone and pressure sensor measurements

View 28304 Spec Sheet

28608B
Programmable Filter/Amplifier

28114 Transducer Conditioner
  • 8-channels/ card,
    128-channels/ system
  • Input: balanced differential with AC/DC coupling

View 28608B Spec Sheet


28000 Signal Conditioning System

 

The 28000 System makes it easy to manage a test with up to 256 channels of fully programmable transducer conditioning. Choose a mix of bridge, charge, IEPE w/TEDS, voltage (filter/amplifier), strain, thermocouple, RTD/potentiometer, frequency or other transducers.

  • Mix up to 256 channels of fully programmable transducer conditioning
  • Choose from 4 or 8-pole programmable filters
  • Choice of 4, 8 or 16-slot chassis
  • Ethernet network interface
  • Automated factory acceptance and go/no-go tests verify system performance

View the 28000 Brochure/Spec Sheet