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Contents
PCI-4451/4452 User Manual vi
©
National Instruments Corporation
Device and RTSI Clocks................................................................................. 3-11
Selecting Sample/Update Clock Frequency.................................................................. 3-12
Device Configuration Issues.......................................................................................... 3-13
Chapter 4
Signal Connections
I/O Connectors............................................................................................................... 4-1
Analog I/O Connector Signal Descriptions ....................................................4-2
Digital I/O Connector Signal Descriptions.....................................................4-5
Analog Input Signal Connections..................................................................................4-9
Types of Signal Sources................................................................................................ 4-10
Floating Signal Sources .................................................................................. 4-10
Ground-Referenced Signal Sources................................................................4-10
Analog Output Signal Connections...............................................................................4-11
Analog Power Connections...........................................................................................4-12
Digital I/O Signal Connections ..................................................................................... 4-12
Digital Power Connections............................................................................................4-14
Timing Connections ...................................................................................................... 4-14
Programmable Function Input Connections ...................................................4-14
Acquisition Timing Connections....................................................................4-15
PFI0/TRIG1 (EXT_TRIG) Signal....................................................4-16
PFI1/TRIG2 (PRETRIG) Signal ......................................................4-17
CONVERT* Signal..........................................................................4-17
EXTSTROBE* Signal......................................................................4-18
Waveform Generation Timing Connections................................................... 4-18
WFTRIG Signal................................................................................ 4-18
UPDATE* Signal ............................................................................. 4-18
General-Purpose Timing Signal Connections................................................. 4-19
GPCTR0_SOURCE Signal .............................................................. 4-19
GPCTR0_GATE Signal ...................................................................4-20
GPCTR0_OUT Signal......................................................................4-20
GPCTR0_UP_DOWN Signal........................................................... 4-20
GPCTR1_SOURCE Signal .............................................................. 4-21
GPCTR1_GATE Signal ...................................................................4-21
GPCTR1_OUT Signal......................................................................4-22
GPCTR1_UP_DOWN Signal........................................................... 4-22
FREQ_OUT Signal........................................................................... 4-24
Field Wiring Considerations.......................................................................................... 4-24
User.book Page vi Tuesday, April 14, 1998 10:20 AM