Calibration Requirements (Rule 52)

01. Measuring Equipment Calibration. All measuring equipment shall be calibrated according to the manufacturer’s recommended calibration schedule, but no less than annually, to meet the manufacturer’s specifications for the accuracy and resolution of the equipment. Measuring equipment shall not be used after its next “calibration due” date for measurements or tests conducted during a stray voltage investigation. Calibration shall be performed by either: (4-6-23) a. The manufacturer of the equipment, who shall certify that the equipment meets the manufacturer’s IDAHO ADMINISTRATIVE CODE IDAPA 31.61.01 Idaho Public Utilities Commission Stray Voltage Rules Section 053 Page 7 specifications for accuracy and resolution; or (4-6-23) b. A laboratory currently certified as meeting all applicable Institute of Electrical and Electronic Engineers (IEEE) and International Organization for Standards (ISO) standards. (4-6-23) 02. Calibration Certificates. The service provider performing the tests and measurements shall maintain certificates from the manufacturer or the calibration laboratory demonstrating compliance with calibration requirements. (4-6-23) 03. Field Check. Before voltage or current measurement or testing is performed, the instrument shall be field-checked by comparing measurements to those of other instruments or against a known source. (4-6-23)