Measurement-computing PCM-DAS16x/16 Manual do Utilizador descarregar pdf (Página 16)

4.4 A/D PACER CLOCK

Many analog acquisitions can be handled by a simple on-board rate divider created by

combining an XTAL with a programmable counter. For those, the on-board 82C54

programmable rate generator supplies the pacing. Some applications require more

flexible rate control.

The PCM-DAS16x/16 analog conversions may be externally triggered and thereby

synchronized with events external to the PC. Conversions may be held off until some

external event, such as a not-to-exceed condition is met. Conversions may be exter-

nally gated so that samples are taken only when an event of interest is occurring, such

as process over normal limits.

Shown here is the A/D pacer clock schematic and the routing of off board trigger

signals.

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Measurement-computing PCM-DAS16x/16 Manual do Utilizador Página 16