Keithley 6517B Reference Manual

A
ppendix D: IEEE-488 bus overview Model 6517B Electrometer Reference Manual
D-4 6517B-901-01 Rev. C / August 2015
Bus management lines
The five bus management lines help to ensure proper interface control and management. These lines
are used to send the uniline commands.
ATN (attention): The ATN line is one of the more important management lines because the state of
this line determines how information on the data bus is interpreted.
IFC (interface clear): As the name implies, the IFC line controls clearing of instruments from the bus.
REN (remote enable):The REN line is used to place the instrument on the bus in the remote mode.
EOI (end or identify): The EOI is usually used to mark the end of a multi-byte data transfer sequence.
SRQ (service request): This line is used by devices when they require service from the controller.

Keithley 6517B Specifications

General

Input Impedance	>200 TΩ
Electrometer Type	Electrometer/High Resistance Meter
Current Measurement Range	20 fA to 20 mA
Display	Vacuum Fluorescent Display
Communication Interfaces	IEEE-488 (GPIB), RS-232
Power Supply	100 V / 120 V / 220 V / 240 V; 50 Hz / 60 Hz
Resistance Measurement Range	Up to 200 TΩ