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The Secondary DC Voltage Standard is delivered fully calibrated and ready to serve within its certified accuracy for a duration of six months before requiring recalibration against primary standards. After unpacking, the line voltage selector switch on the rear panel should be set to 115 or 230 volts, as appropriate. The AN3100 is ready for use; however, material in this manual will be informative and valuable for proper instrument application. 1.1 General Description 1.1.1 Review of A ...