Precia Molen Engineer- Customer Support Interview Questions, Process, and Tips

A load cell is a transducer that converts force into an electrical signal.

• Load cells are commonly used in industrial applications to measure weight or force.

• They are often found in scales, industrial equipment, and testing machines.

• Load cells can be made from various materials such as steel, aluminum, or even piezoelectric crystals.

Components of an electronic weighing scale include load cells, display unit, microcontroller, and power supply.

• Load cells: convert the force of the weight into an electrical signal

• Display unit: shows the weight measurement to the user

• Microcontroller: processes the signal from the load cells and controls the display

• Power supply: provides the necessary power for the scale to function

Sensitivity of a load cell refers to the smallest change in weight that can be accurately detected by the load cell.

• Sensitivity is typically measured in mV/V or % of full scale output per unit of weight change.

• Higher sensitivity means the load cell can detect smaller weight changes.

• Factors affecting sensitivity include material properties, design, and calibration.

• Example: A load cell with a sensitivity of 2 mV/V can ac...read more

2mV/V or 3mV/V refers to the sensitivity of a strain gauge sensor.

• mV/V stands for millivolts per volt, indicating the output voltage change per unit change in input

• 2mV/V means the sensor output voltage changes by 2 millivolts for every volt of excitation voltage

• 3mV/V means the sensor output voltage changes by 3 millivolts for every volt of excitation voltage

To check earthing on power supply, use a multimeter to measure the resistance between the earth terminal and a known earth point.

• Use a multimeter set to resistance mode

• Connect one probe to the earth terminal of the power supply

• Connect the other probe to a known earth point (e.g. a metal water pipe)

• A low resistance reading indicates good earthing

• A high resistance reading indicates poor earthing