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Weight or Force measurement module

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Aim:This unit deals with weight (force or stress)measurement On completion of this unit you will become familiar with weight(force) measurements and to test sensor / Transducer characteristics against weight/force.
Equipment Required:
  1. Voltmeter -2V to 20V range.
  2. Power supply - $\pm$12V DC.
  3. Load cell - 20kg.
  4. Weights 1,2,5 kg.
  5. Panel.
Theory: Strain gauge can be used to measure weight / force. Heavy loads requires load cell for weighing purpose. Typical load cell construction is shown in figure bellow.
Load Cell



Stress in the direction of S as shown in above figure causes compression along the axis and expansion in the X & Y axes. This results decrease in the resistance of gauge A & increase in the resistance of gauge B. Gauges on all four sides of bar if connected in bridge form gives high sensitivity and thus measurement of small loads as well as heavier loads is possible.
Procedure: Panel provides all circuitry needed to perform experimentation on weight / force measurement .Load cell required is external and should be connected through "D" connector. On board circuitry consist of instrumentation amplifier and single ended amplifier. Zero adjustment and span adjustments potentiometers are provided.
  • Select the sensor by setting rotary 6 position switch at correct location.
  • Connect $\pm $12V DC to the panel terminals connect external load cell to the panel through "D' connector. Plate on load cell is provided for placing different loads (weights).
  • Connect a voltmeter across output terminals. Adjust output to zero volts by zero potentiometer for no load(weight) condition.
  • Place 10kg weight/load in the pass of load cell and adjust output to 1V DC by span potertiometer.
  • Repeat the above produce for "0" output and 1V output condition twice or thrice to ensure correct range adjustment.
  • Read carefully procedure given
  • Now note down the output voltage against different weights as indicated in observation table.
Observation table
SnoLoad/Weigth Kg Output Voltage Load cell measured weight (Output volt*Multiplication factor)
1
2
3
4
5
Plot a graph of load(weight) versus output voltage and calculate slope of it
Conclusion: Observations and graph plotted shows linear relation between output voltage and weight(load).
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Comments

Presto Group said…
Thanks for sharing this informative post. It's very helpful. Keep it up!

Tensile Testing Machine | Laboratory Testing Equipment & Instruments
Feb 9, 2021, 6:43:00 AM
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