Keithley 708B Reference Manual page 7

Table of Contents
Functions and features .............................................................................................. 3-1
Scanning and triggering ....................................................................................................... 3-1
Trigger model ....................................................................................................................... 3-1
Trigger model components........................................................................................................ 3-3
Trigger model events and associated commands ..................................................................... 3-4
Scan and step counts........................................................................................................... 3-4
Basic scan procedure........................................................................................................... 3-5
Changing attributes of an existing scan .................................................................................... 3-6
Front-panel scanning ................................................................................................................ 3-6
Foreground and background scan execution ............................................................................ 3-7
Include multiple channels in a single scan step......................................................................... 3-7
Remote interface scanning .................................................................................................. 3-8
Scan and trigger commands ..................................................................................................... 3-8
Scanning examples................................................................................................................... 3-9
Hardware trigger modes..................................................................................................... 3-12
Falling edge trigger mode ....................................................................................................... 3-14
Rising edge master trigger mode ............................................................................................ 3-15
Rising edge acceptor trigger mode ......................................................................................... 3-15
Either edge trigger mode......................................................................................................... 3-16
Understanding synchronous triggering modes .................................................................. 3-17
Synchronous master trigger mode .......................................................................................... 3-18
Synchronous acceptor trigger mode ....................................................................................... 3-19
Synchronous trigger mode ...................................................................................................... 3-20
Events ................................................................................................................................ 3-21
Event blenders ........................................................................................................................ 3-22
Theory of operations .................................................................................................. 4-1
Models 707B and 708B theory of operations overview ....................................................... 4-1
Mainframe ............................................................................................................................ 4-1
Important test system safety information................................................................................... 4-2
Instrument fan (Model 707B only) ............................................................................................. 4-3
AC power entry ......................................................................................................................... 4-3
Universal power supply ............................................................................................................. 4-3
Microprocessor board ............................................................................................................... 4-3
Communication interfaces......................................................................................................... 4-4
Trigger and control interfaces.................................................................................................... 4-4
Backplane ................................................................................................................................. 4-4
Front panel ........................................................................................................................... 4-6
Upper crosspoint display (Model 707B only) ............................................................................. 4-6
Remote commands..................................................................................................... 5-1
Introduction to remote operation .......................................................................................... 5-1
Controlling the instrument by sending individual command messages ..................................... 5-1
Queries ..................................................................................................................................... 5-3
Data retrieval commands .......................................................................................................... 5-3
Information on scripting and programming ................................................................................ 5-3
About ICL commands........................................................................................................... 5-4
ii
Models 707B and 708B Switching Matrix Reference Manual
707B-901-01 Rev. A / August 2010