Valhalla Scientific^ Dual Channel, Polyphase, Digital Wattmeters are accurate, moderate-cost instruments for power analysis in engineering, production test and quality assurance departments. They provide indication of product power consumption in the 10 Hz to 50 KHz range for devices operating from AC power lines. Voltage, current and power are shown simultaneously on separate digital displays. Two separate voltage and current input channels may be displayed separately or in combined form, permitting single phase, two phase-and three phase measurements of all three parameters. Voltage and current readings are true R M S; power is true watts (El cos Θ ). These Wattmeters provide a fast and convenient means of determining product efficiency, power factor and true RM S current. Load phase angle relationships may be accurately calculated using the displayed digital data. The power computation section of the Wattmeter uses unique four-quadrant complex waveform analog multipliers. Their outputs are DC signals proportional to the product of the instantaneous values of voltage and current in each of two channels. Two resultant wattage values are integrated, summed and presented on a 4 1/2 digit display. Ranges of 100% and 2 0 % of the instrument’s maximum current are switch-selectable. Additional switching permits separate display of either input channel. The Wattmeters are designed to operate from a 115 or 230 volt, 50-60HZ AC supply. Power is supplied through a plug-in cord equipped with a 115 volt, 15 amp connector. Other connector types are available upon request