Model 6514 is a 6½-digit high-performance system electrometer. It can measure voltage, current, resistance and charge. Details on its measurement capabilities are explained in Section 2 of this manual (see “Measurement Overview”). Features of Model 6514 System Electrometer include: • Setup storage — Five instrument setups (three user, GPIB defaults and factory defaults) can be saved and recalled. • mX+b and percent — These calculations provide mathematical manipulation of readings. • Relative — Null offsets or establish baseline values. • Buffer — Store up to 2500 readings in the internal buffer. • Limits — Set up to two stages of high and low reading limits to test devices. • Digital I/O port — Four output lines and one input line to control external circuitry. Use as an interface between limit tests and component handler. • Analog outputs — Provides a 2V analog output for a full range input. Preamp out provides a driven guard for Volts, or can be used for external feedback measurements. • External feedback — Extends the measurement capabilities of the electrometer; logarithmic currents, non-decade current ranges and non-standard charge ranges. • Remote interface — Model 6514 can be controlled using the IEEE-488 interface (GPIB) or the RS-232 interface. • GPIB programming language — When using the GPIB, the instrument can be programmed using the SCPI or DDC programming language.