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2.1 Instructions for use of strain gauge sensors
Notice:
Strain gauge sensors with a small range are extremely sensitive to improper handling. Force
transducers can be destroyed simply by touching. Same applies to the diaphragms of pressure
transducers. So, bear in mind: handle with care!
Loading the transducer in excess of the nominal range may result in an increased and lasting zero
balance offset as well as damage to the sensor. The same applies to short-term force or pressure
impulses that exceed the nominal range.
To most force transducers the force must be applied centrically in order to avoid shear forces, which
may be harmful to the sensor, or may cause measurement inaccuracy. Rounded surfaces, joint heads
or other suitable guides can ensure centric force transmission.
Tightening torques while mounting any sensors may result in an increased zero balance offset.
If the sensor has been replaced, the calibration of the amplifier must be checked. A new adjustment
might be necessary.
3 Technical description
The described single channel measuring amplifier serves to supply a strain gauge sensor with a full
bridge resistance of 300 Ohms or more and the amplification of the sensor signal. The supply voltage
of the amplifier is galvanically isolated from analogue output, sensor supply and sensor signal.
Standard analogue outputs are available for further evaluation.
The coarse amplification is determined by an internal resistor and can be fine adjusted by a
potentiometer on front of the amplifier. A second potentiometer on front allows the correction of the
zero point.
The presence of the supply / internal operating voltage is indicated by the 2 green LEDs on the front.
