load cell testing

Start with the excitation leads. With the cell unloaded, measure the input and output resistances against the datasheet—typically 350Ω or 1000Ω for strain gauge types. Then check zero balance: with excitation applied, the output should be near 0mV/V, usually within 1% of full scale. Next, apply a known load and verify the output changes linearly. If you see drifting or out-of-spec resistance, the cell may have moisture ingress or a damaged gauge.

There's no fixed rule, but for industrial weighing, a full calibration every 12 months is common. If the cell is exposed to shock loads, temperature swings, or corrosive environments, check zero balance and insulation resistance every 3–6 months. For critical applications like structural health monitoring, continuous diagnostics like shunt calibration can flag issues between formal tests.

Calibration relates the cell's output to known weights and corrects the entire measurement chain. Testing is broader—it includes visual inspection, insulation checks, and verifying that the cell hasn't developed internal damage. You can test a load cell without calibrating it, but a calibration run will usually reveal if something is wrong.

We don't operate a test house for third-party cells, but our engineers can review your test data and recommend next steps. If you send us resistance readings, zero balance measurements, or load test results, we'll tell you whether the cell likely needs replacement or adjustment. For complex systems, we can also suggest local calibration labs.

Water ingress and cable damage lead the list. Even IP67-rated cells can develop problems if the cable is crushed or the seal is broken. During testing, a sudden drop in insulation resistance—below 500MΩ at 50V—often points to moisture. Improper mounting is another frequent issue: off-center loading or binding introduces side forces that skew the test results long before the cell fails electrically.