Strain Bridge Description and Specifications for Lab Tenders
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
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 –
The 20 000 point digital display allows measurements in the range ± 20 000 mm/m, whatever the gauge alloy.
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.
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:
Allows for each series of measurements :
Strain bridge initialisation.
Channel selection, gain, configuration (full or half-bridge), gauge
factor, graph configuration, sampling rate, total number of
Saving test to file.
Card-bridge connecting cable.
Analogue / Digital acquisition card.
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.
Voltage : 220 V, 50 or 60 Hz
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