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 AN3100 Features: • Dual five decade output ranges ±11.1110 Volts DC with 100µV resolution; Main Output (Front Panel Terminals) ±111.110 Millivolts DC with 1µV resolution; Auxiliary Output (Rear Panel Terminals) • Accuracy 0.005% of reading ±50 µV @ 20° C ±0.0002%/°C • Warmup to rated accuracy in less than 10 minutes • High output current of 50 mA; short circuit-proof • 10-milliohm output impedance (100 ohms on low output range) • No maximum external load capacity • Isolated circuitry is unaffected by common mode voltages up to ±500 V • Front panel ±1 mV vernier