Strain Bridge

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Product Code: AEM025

Strain Bridge Manufacturer

Strain Bridge

The high-contrast digital display gives a direct reading in micro-strains, for half or full bridge operation of the six channels. Measurements with a quarter bridge configuration can be made by adding a resistor. The gauge factor can be adjusted between 1 and 5. Each channel can be balanced separately by means of multiturn potentiometers.
An analogue output for each channel permits the display of the signals using an oscilloscope or a plotter, and also data acquisition.
With the bridge energisation of 2.5 V, strain gauges of 120 W minimum can be used. These can be in Constantan, Isoelastic Karma or Platinum – Tungsten alloys.
The 20 000 point digital display allows measurements in the range ± 20 000 mm/m, whatever the gauge alloy.

Technical specifications

  • Number of channels: 6.
  • Operating range: ± 20 000 µm/m.
  • Resolution: ± 1 µm/m.
  • Bridge energisation: 2.5 V – Stability: 10-4.
  • Gauge configuration: Full or half bridge with gauges of 120 to 5000 WQuarter bridge with additional resistor.
  • Input impedance: 1010 W.
  • Balance: using multi-turn potentiometers ± 2000 µW/W.
  • Gauge factor read directly on display adjustable from 1 to 5 by multi-turn locking potentimeters.resolution: 0.001.
  • Amplifier: precision 1 %.
  • linearity: ± 0.002 %drift: 0.25µV/°C noise: less than 13µV per Hzcommon mode rejection:< 100 dB.
  • Analogue outputs: independant output for the 6 channels, using Cannon 9 pin connectors max. output voltage: 10 V band pass: 0 – 10 kHz.
  • 2 V for 20000 µW/W.
  • Minimal load: 22000 W.
  • Gauge connections: 15 pin Cannon connectors way rapid connector.

Option :

  • Data acquisition and processing with an IBM-PC or compatible micro-computer, the system can configure and read the six channels simultaneously. It comprises three elements:

Software package

Allows for each series of measurements :

  • Test identification.
  • Strain bridge initialisation.
  • Channel selection, gain, configuration (full or half-bridge), gauge factor, graph configuration, sampling rate, total number of acquisitions.
  • Visualisation.
  • Safeguard.
  • Print-out.
  • Saving test to file.
  • Card-bridge connecting cable.
  • Analogue / Digital acquisition card.

Features :

  • Reads 16 single analogue inputs or 8 differential analogue inputs.
  • 12 bit digital conversion, or a resolution of 4096 points full scale.
  • Accepts maximum voltages of 0 to 10 volts in unipolar mode and ± 5 volts in bi-polar mode.
  • Fixed frequency acquisition, through built-in time

Dimensions and weight

  • 265 x 105 x 84 mm.
  • Net weight : 1.8 Kg.

Essential requirements

  • Voltage : 220 V, 50 or 60 Hz
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