INTRODUCTION The Model 179A is a precision 4 1/2 digit TRMS multimeter useful for measurement of AC and DC voltage, AC and DC current and resistance. Ranges and accuracies are listed in the detailed specifications which precede this section. Ranges and functions are selected with front panel push buttons. The decimal point is also positioned by the selected range push button. Polarity of the measured signal is automatically displayed. FEATURES The Model 179A includes the following features: • TRMS AC measurement capability gives waveform-insensitive measurement accuracy to applications such as solid-state regulator design, measurement of power transformer input currents and capacitor ripple currents. • AC and DC CURRENT ranges allow continuous measurements of up to 15A or periodic measurement up to 20A. • 10µV AC and DC sensitivity • HI-LO Ohms. In the HI mode, enough voltage can be applied to semiconductors to turn them on for a test. LO can be used for in-circuit measurements without turning on semiconductor junctions. Full-scale compliance voltage is 2V on HI, 200mV on LO. • 1kV protection on Ω. 1000V overload protection on ohms eliminates accidental damage due to improper function selection. • Optional BCD output. The Model 1792 Isolated BCD Output may be ordered and is field installable. • Optional IEEE-488 data output. The Model 1793 IEEE-488 Interface can be ordered with the unit, or can be easily field-installed with a screwdriver, It is powered internally from the instrument. With the interface and any of the low cost controllers now on the market, it is possible to set up an economical, automated test system that saves the time of manually recording, transcribing and entering large amounts of measurement data.