Keithley 6485 User Manual

• Overview — Provides an operational overview of the status structure for Model
6485.
• Clearing registers and queues — Covers the actions that clear (reset) registers and
queues.
• Programming and reading registers — Explains how to program enable registers
and read any register in the status structure.
• Status byte and service request (SRQ) — Explains how to program the status
byte to generate service requests (SRQs). Shows how to use the serial poll sequence
to detect SRQs.
• Status register sets — Provides bit identification and command information for
the four status register sets; standard event status, operation event status, measure-
ment event status, and questionable event status.
• Queues — Provides details and command information on the output queue and
error queue.
10
Status Structure

Keithley 6485 Specifications

General

Model	Keithley 6485
Category	Picoammeter
Input Impedance	>10^14 Ohms
Voltage Burden	<200µV
Accuracy	0.4% of reading
Voltage Source Range	Not Applicable
Voltage Source Resolution	Not Applicable
Voltage Source Accuracy	Not Applicable
Interface	IEEE-488
Power Requirements	100V to 240V AC, 50/60Hz
Dimensions	89 mm high x 214 mm wide x 369 mm deep (3.5 in x 8.4 in x 14.5 in)