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Do not replace the load cell in a tensile testing machine solely because the force trace drops or develops a step. Specimen slip, grip seating, force-channel saturation and actual specimen failure can produce superficially similar traces. Preserve the raw observations before smoothing the curve or recalibrating the sensor.
Compare the Force Trace With What the Fixture Did
Record the force channel and available displacement measurements on a common time basis. Note the grip condition, specimen preparation and test speed. Where the test procedure permits, use external observations or reference marks to identify slip without placing personnel near a loaded fixture.
If the same trace feature occurs with different specimens at the same electrical limit, investigate the acquisition range. If it follows a particular grip or specimen surface, investigate clamping and seating. Neither observation alone proves the cause, but both help choose the next controlled test.
| Symptom | Compare | Next step |
|---|---|---|
| Early step | Grip seating and preload sequence. | Repeat the approved seating procedure before changing span. |
| Sudden drop | Specimen condition and evidence of movement in the grips. | Separate slip from rupture using retained observations. |
| Flat peak | Raw input and amplifier or software limits. | Check clipping before attributing a plateau to the material. |
| Shifted zero | Unloaded state after safe release of the specimen. | Inspect fixture binding and the force channel before re-zeroing. |
Load Cell for Tensile Testing Machine: Match the Full Chain
The MV-LC0099 S-type cell is documented for axial tension and compression. Its nominal output is 2 mV/V; the specified bridge excitation is 10-12 V DC. The amplifier must accept the resulting signal over the intended force range, including preload. These values do not establish a sampling rate or force-peak capture capability.
Specify the highest useful test frequency or shortest feature that needs resolution, the acquisition settings and filtering. A filter can make a curve look cleaner while obscuring an event. Retain the unmodified data where the system permits, and document any processing used in the reported result.
Replacement Questions
Q1. Does a correct static calibration prove a rupture peak was captured?
No. Static calibration establishes behaviour under its test conditions. Capturing a rapid event also depends on mechanical response, sampling, filtering and timing. Request evidence for the intended test rather than inferring it from a static accuracy number.
Q2. When is a new sensor justified?
After inspection and controlled checks identify damage, out-of-specification behaviour or a genuine range mismatch. Provide the old sensor data, fixture drawing, force traces and amplifier limits with the enquiry. A different capacity will not correct slipping grips.
Summary
Diagnose the force trace as part of the machine, not as a standalone sensor verdict. An MV-LC0099 replacement review should explain the required force range and observed failure, then define the verification needed after installation.
