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Load cell testing can mean checking a disconnected bridge, applying a reference force, or verifying the complete scale. Those tests answer different questions. Record which equipment was connected, how the force was applied and which settings were active before concluding that a cell has passed or failed.
Start with the symptom and preserve the settings
Record the unstable or incorrect reading before changing zero, span or filtering. Note whether it follows load position, temperature, motor operation or cable movement. Make the equipment safe under the site's procedure before accessing connections or releasing any support.
For METRAVON MV-LC0099, the published input resistance is 380 +/-5 ohm and output resistance is 350 +/-2 ohm. These are model-specific bridge data, not universal limits for all load cells. Identify the terminal functions from the delivered documentation before measuring.
Load cell testing at four different boundaries
| Test | What it can establish | What it does not establish |
|---|---|---|
| Bridge resistance | Whether a disconnected circuit is consistent with its specified resistance. | Correct sensitivity or freedom from mechanical damage. |
| Excitation | Whether the intended supply reaches the connected sensor. | Correct indicator scaling or an accurate reference load. |
| Known force | Response and recovery under the applied direction and fixture. | Behaviour at untested forces, positions or operating states. |
| Installed scale | Combined mechanical and electrical performance within the test scope. | Which individual component caused an error without further isolation. |
Use a suitable low-energy meter on an isolated circuit for resistance checks. Do not apply an insulation tester or high-voltage test across bridge terminals unless the manufacturer supplies the applicable procedure. Disconnecting electronics and controlling test voltage are essential parts of protecting the measuring circuit.
Record a sequence, not one successful reading
For a controlled load check, retain unloaded indication, applied reference, indicated result and the reading after release. Repeat the relevant cycle. Where both force directions are used, distinguish tension and compression results rather than combining them into a single statement.
On an assembled scale, inspect binding and load bypass before adjusting electronics. If a wiring correction resolves the symptom, repeat the installed checks; the repair itself is not the acceptance evidence. Keep the original configuration record so accidental changes can be identified.
Q1. Does normal resistance prove that the sensor is accurate?
No. A bridge can remain electrically continuous while its zero, sensitivity or mechanical response has changed. Evaluate its response to a suitable reference under controlled conditions before accepting measurement performance.
Q2. What should accompany a suspected-fault return?
Provide the model and serial number, wiring diagram, symptom history, test instrument and recorded results. State any overload, cable repair or moisture exposure without treating those observations as a proven diagnosis.
Summary
Send the evidence for a load cell fault assessment before replacing parts. Use the calibration-record checklist when deciding whether the resulting test report covers the required acceptance scope.
