Some important Model 6517A features include: • Full range of functions — Exceptional sensitivity and accuracy for voltage, current, charge, and V/I resistance and resistivity (surface and volume) measurements. With the Models 6517-RH and 6517-TP, relative humidity and external temperature can be measured. • Voltage source — The internal 1000V V-Source can be configured with the ammeter to make V/I resistance/resistivity measurements, and to force voltage, measure current. • Two-line display — Readings and front panel messages are provided on the top line (primary) 20-character, and bottom line (secondary) 32-character alphanumeric dis- play. The multiple display provides supplemental information about the reading, such as min/max readings, bar graphs for the reading, and time and date. • Reading and setup storage — Readings and setup data can be stored and recalled from memory. Over 15,000 readings can be stored in the buffer, and up to 10 instrument setups can be stored in memory. • Test sequences — Built-in tests for the following applications: device characterization, resistivity, high resistance /resistivity (alternating polarity method), surface insulation resistance, and voltage sweeps. • GPIB interface — Accommodates two separate languages for IEEE-488 operation. The SCPI language conforms to the IEEE-488.2 and SCPI standards. The 617 emulation mode (DDC language) allows the instrument to be controlled using device-dependent command programming. • RS-232 interface — The instrument can instead be con- trolled over this serial interface using SCPI commands. • Talk-only mode — From the front panel, you can set the instrument to send readings to a printer. Talk-only is available over both the GPIB and RS-232 interfaces. • Scanning — The Model 6517A has an option slot that will accommodate an optional scanner card (Models 6521 and 6522). The instrument can also be configured to operate with an external switching system (i.e., Model 7001 or 7002) to scan external channels. • Trigger link — This is a new trigger concept that provides more versatile and precise external triggering. It is in addition to the standard Trigger In/Meter Complete Out BNC external triggering techniques. • Digital calibration — The instrument may be digitally calibrated from either the front panel, or over the RS- 232 interface or GPIB bus (SCPI language).