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I work for a third party cal lab and we calibrate a lot of load banks. Many companies are bound by ISO 17025 requirements to calibrate the load banks used to verify the voltage and current output of welding machines. We have to verify the voltage meter is reading correctly, and since we can only produce up to 100A of current accurately using a transconductance amplifier, we indirectly calibrate the current meter by determining the resistance of the current shunt, and then applying a millivolt signal to the current meter corresponding to what the predicted millivolt output would be across the shunt at larger currents according to Ohm's Law. Then we operational test it across the load elements (essentially a bank of resistive heating coils) just to make sure they are working properly and not burned open (happens not too infrequently).
Sorry Shane just read your response great minds think alike...................maybe lol
The local procedure / process will dictate if calibration is required.....If the process says set the voltage at a specified setting then calibration is probably going to be required. If the procedures says set the weld machine as required per the operator to achieve desired weld, then no calibration would be required.
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