Notes on Load Cell Testing

Introduction

• Importance of load cell in electrical scales
• Proper functioning is crucial for accurate weight measurement
• Overview of the video: Simple test for load cells

Preparation for Testing

• Have the load cell calibration certificate ready
  • Refer to the wiring diagram
  • Pay attention to cable color codes
  • Note output impedance and input impedance
• Compare measurement values with calibration certificate post-testing

Testing Procedure

1. Setup

• Prepare a multimeter
• Measure resistance across input and output
  • Signal wires = Output
  • Excitation wires = Input

2. Measuring Output Resistance

• Connect multimeter between positive and negative signal wires (green and white leads)
• Expected output resistance:
  • Should be close to 350 ohms
  • Example reading: 353 ohms (acceptable)

3. Measuring Input Resistance

• Measure between positive excitation wire (red) and negative excitation wire (black)
• Expected input resistance:
  • Should be around 435 ohms
  • Example reading: 439.7 ohms (acceptable)

4. Testing Load Cell Accuracy

• Need a multimeter and voltage source (use load cell controller)
• Connect controller to a 220 volts AC source
• Supply 10 volts DC excitation voltage across input leads
• Measure millivolt signal across signal wires (gray and white wires)
  • Expected value with no force applied: 0 mV
• Apply calibrated weight and compare output voltage with specified value in the calibration certificate

Conclusion

• If measurements match specifications, load cell is functioning correctly
• For more information on load cell testing, visit the website
• Links for budget-friendly load cells in the description section

Thank you for watching!