Conditioners for Dynamic Strain Measurements

PFI’s Suite of Analog Cards for Dynamic Strain and Bridge Conditioning

Precision Filters’ suite of conditioning cards provides solution for dynamic strain (including high temperature strain) or any bridge-type transducer including pressure sensors, piezo-resistive accelerometers, load cells and more.

The 28458 provides conditioning for 8 channels of dynamic strain measurements. The 28144 and the 28114 provide 4 channels of dual mode measurements, either dynamic strain, static strain or bridge conditioning. All three cards feature PF's Balanced Constant Current™ (BCC™) technology and “on-the-fly” measurement of transducer resistance, excitation and leakage resistance, alerting the operator immediately to an out-of-tolerance condition. Equipped with Precision’s FLAT/PULSE filter technology, these amplifiers provide outstanding response for applications in either the time domain or the frequency domain.

PFI developed the BCC technology – the industries best technique to measure dynamic strain, even in harsh environments, using only a two-wire connection to the gage. The circuit is insensitive to changes in lead resistance with temperature and since the circuit is balanced, the differential input amplifier rejects noise pickup in the leads.

Conditioners for Dynamic Strain Features

  • Balanced programmable constant current excitation
  • Automatic bridge balance/suppress
  • FLAT/PULSE low-pass filters w/filter bypass
  • DistributioedPre-filter overload detection
  • On-the-fly report of measured transducer excitation, resistance, open/short and leakage to ground
  • Sensor mute mode
  • Multiple buffered outputs per channel

28458
Dynamic Strain Conditioner

28458 Dynamic Strain Conditioner
  • 8-channels/ card,
    128-channels/ system
  • Excitation: balanced constant current
  • 4-pole FLAT/PULSE low-pass filters w/filter bypass
  • Five programmable cutoff frequency settings to 100 kHz

View 28458 Spec Sheet

28144 Wideband Transducer Conditioner

28144 Strain/Bridge Conditioner
  • 4-channels/ card,
    64-channels/ system
  • Excitation: balanced constant current or constant voltage
  • Choice of 4 or 8-pole FLAT/PULSE low-pass filters or 8-pole band-pass filters
  • Over 2,000 unique cutoff frequency settings from 1 Hz to 204.6 kHz
  • REZCOMP™ technology to extend frequency response of accelerometer, microphone and pressure sensor measurements

View 28144 Spec Sheet

28114
Transducer Conditioner

28114 Transducer Conditioner
  • 4-channels/ card,
    64-channels/ system
  • Excitation: balanced constant current or constant voltage
  • 4-pole FLAT/PULSE
    low-pass filters w/filter bypass
  • Five programmable cutoff frequency settings to 100 kHz

View 28114 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