Digital Multimeter Calibration Purpose The purpose of this procedure is to provide instruction for the calibration of digital multimeters (DMM). Scope All multimeters (multi-range instruments used to measure voltage, current, and resistance) are to be verified in calibration no less than once per year. Procedure Preliminary Instructions and Notes • Read this entire procedure before beginning the calibration. • Calibration shall be performed in an environment that conforms to Manufacturer Specifications.
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Super Mario Text Download Programs there. • The digital multimeter will hereafter be referred to as the Instrument Under Test (IUT). • Verify that the IUT is clean. • Visually examine the IUT for any condition that could cause errors in the calibration. • If any of the requirements cannot be met, refer to the applicable manufacturer manual.
• If a malfunction occurs or a defect is observed while calibration is in progress, the calibration shall be discontinued and necessary corrective action taken; if corrective action affects a measurement function previously calibrated, the function shall be recalibrated before the remainder of the procedure implemented. Reference Material Applicable Manufacturers Manual or Brochures. Specifications The specifications of the IUT are determined by the applicable manufacturer's documentation. If the manufacturer's documentation is not available, then the specifications identified in this procedure are used.
Equipment Required The Standards listed below should be selected on the basis of their higher accuracy level when compared to the unit under test. Equivalent Standards must be equal to or better than the Minimum-Use-Specification. Minimum-Use-Specifications for Standards listed are 1/4 the accuracy required by the IUT. • Rotek Model 2500 Calibrator or equivalent • Diode Test Fixture • Test Leads • Continuity Test Fixture • Capacitance Test Fixture • Thermometer • Hydrometer Set-Up Turn all power on (calibrator and the unit to be calibrated). Allow the instruments to stabilize for approximately 5 minutes. Conduct the tests in an ambient temperature of 25 ± 5C and a relative humidity of less than 80%.