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The 7081 voltmeter is a high quality instrument designed for calibration, laboratory and systems applications. It combines superb measurement performance with data storage facilities and processing power. The unit has no internal options having all facilities as standard. Facilities The instrument provides the following facilities: • DC voltage and resistance measurements to a scale length of 140 000 000 and true rms volts ac, or volts ac + dc, to a scale length of 1400 000. • The ability to ratio any of the above inputs to a dc voltage or to a constant. • Automatic storage of results (History file). • Processing of measurements to provide additional results. • Remote control using either RS232C or IEEE-488 (GP-IB) interfaces. • Calibration, via either of the two interfaces, without the need to remove covers. • Interface for Minate analogue scanner, providing a multi-channel measurement capability. Measurement Capability DC voltage measurements can be made using scale lengths of 3,4,5,6,7 and 8x9; the 3 and 4x9 scales are available only by remote control. Each scale length provides a different integration time and can be used over all ranges, i.e. 0.1 to 1000V. Two types of ac voltage measurement are possible; a true rms value of the ac component only of an input or the rms of the total signal (ac + dc). Scale lengths of 3,4,5, and 6x9 and ranges of 0.1 to 1000V are available for both types of measurement.