Diagnostic tool
Current Display vs Shunt Check Tool
Estimate real output current from a shunt measurement and compare it with a panel current display before judging current feedback or output-stage faults.
Enter shunt and panel readings
Result will appear here
Enter shunt values and generate a real-current estimate.
How this WelderData tool should be used
This tool is a service calculator for comparing a panel display value with an external shunt measurement. It does not replace a safe load test, calibrated meter or qualified repair procedure.
If the panel display changes under a 24V signal-board bench test but the shunt shows no output current, the panel value should be treated as a simulated control-side value, not real welding output.
A low-current post-repair welding test may show a real output current far below the machine rating. In one WelderData ZX7-250 validation pattern, a 300A-class external meter was used during a light-load test and the actual current was about 50A. That type of external-current evidence is more useful than relying only on the front-panel number.