The Model 2250 is a 16-bit microprocessor-based Digital Analyzing Voltmeter that utilizes waveform sampling technology and sophisticated signal processing techniques, The unit is used to measure all conventional phase angle voltmeter signal parameters (phase angle, fundamental, inphase, and quadrature); in addition, the unit contains extensive signal analysis features used for determination of magnitude, phases and harmonic parameters of measured signals. The DAV is a dual-channel Measurement system comprising identical signal and reference circuitry. Reference autoranging allows operation with reference levels ranging from 2 mV to 500 V rms. The reference and signal channel isolation features enable the input voltages to float with respect to the circuit ground.