1-2. The Model 5200A is a guarded, precision AC Calibrator designed for use in calibration laboratories and in manufacturing environments. The Calibrator provides accurate ac voltages from 100 μν to 120V rms, at currents up to 50 mA, and at frequenceis from 10 Hz to 1.2 MHz. 1-3. The amplitude of the output voltage is controlled by a range selector switch and six decade switches. Any of seven amplitude ranges (lmV, 10 mV, 100 mV, IV, 10V, 100V, and 1000V) may be selected. (The 1000V range is used only in conjunction with a companion unit, the Model 5205A Precision Power Amplifier). The decade switches can then be set for any value from 10 to 120 percent of the selected range (each range has a 20 percent overrange capability). Six-digit resolution within the selected range provides steps as small as 1 nV in the 1 mV range through 100 μν in the 100V range (and 1 mV steps in the 1000V range). The amplitude can be offset up to either ±0.3 percent or ±3 percent (selectable) by means of a voltage error measurement feature. This feature provides direct indications of percentage error during calibration of voltmeters. 1-4. The frequency of the output voltage is similarly controlled by a range selector switch and four decade switches. Any of five frequency ranges (100 Hz, 1 kHz, 10 kHz, 100 kHz, and 1 MHz) may be selected. The decade switches can then be set for any value from 10 to 120 percent of the selected range. Four-digit resolution within the selected range provides steps as small as 0.01 Hz in the 100 Hz range through 100 Hz in the 1 MHz range. If desired, the frequency can be phase-locked to an external reference source connected by coaxial cable to a BNC connector on the rear panel. The accuracy of the phase- lock feature is±l degree (nominal). 1-5. The selected output of the 5200A is available at output connectors located on both the front and the rear panels. The front panel connectors are banana-type jacks and are provided for high and low output lines, high and low sense input lines, guard, and ground. The rear panel connectors are a pair of pcb card-edge connectors accessed through openings in the panel. One of the connectors provides interconnection to the Model 5205A Precision Power Amplifier (when used), and the other provides the selected calibrator output (except ground) to any other external equipment requiring it. 1-6. In addition to the regular calibrator outputs, a quadrature output and a counter output are available at BNC connectors on the rear panel. The quadrature output leads the regular output in phase by 90 degrees. The amplitude of the quadrature output is proportional to the setting of the amplitude control decade switches. Regardless of the range selected, the rms amplitude of this output will be anywhere from IV, at minimum setting, to 12V, at maximum setting. At full-range (100 percent) setting, the amplitude will be 10V rms. The counter output is the same frequency as the other outputs, but in pulse form. The pulses are fixed in amplitude at +3V peak, and vary in width according to the selected frequency range.