If you suspect an LVDT (Linear Variable Differential Transformer) is giving inaccurate readings, follow these steps to diagnose and resolve the issue:
1. Check the Power Supply
Ensure the LVDT is receiving the correct excitation voltage and frequency as specified by the manufacturer. Incorrect power input can cause erratic readings.
2. Inspect the Wiring and Connections
Loose, damaged, or improperly connected wires can lead to signal noise or incorrect outputs. Verify that all connections are secure and match the wiring diagram.
3. Examine the Signal Conditioning Electronics
If the LVDT is connected to a signal conditioner or data acquisition system, check that the settings (such as gain, offset, and filtering) are correctly configured.
4. Verify the Core Alignment and Movement
The core must move freely along the LVDT’s axis without tilting or binding. Misalignment can introduce measurement errors or non-linearity.
5. Look for Environmental Interference
Electromagnetic interference (EMI), extreme temperatures, or vibrations can impact LVDT performance. Shielding cables, proper grounding, and environmental protection can help mitigate these effects.
6. Compare Readings with a Known Reference
If possible, test the LVDT against a calibrated reference measurement tool to determine if the readings are within an acceptable range.
7. Check for Physical Damage or Wear
Over time, mechanical wear or external damage to the LVDT can affect performance. If the sensor is old or damaged, replacement may be necessary.
8. Perform a Calibration Check
If the LVDT’s accuracy is out of specification, recalibrating the signal conditioning electronics may help restore accuracy. However, if the sensor itself is faulty, recalibration may not be sufficient.
If you've gone through these steps and the issue persists, replacing the LVDT may be the best solution. Need help troubleshooting your LVDT? Contact us today!