KPCI-3101 — KPCI-3104 Series User’s Manual
To select internally-retriggered scan mode, use software to specify the following parameters:
•
The dataflow as continuous, continuous pre-trigger, or continuous about-trigger
•
Triggered scan mode usage as enabled
•
The retrigger mode as internal
•
The number of times to scan per trigger or retrigger (also called the multiscan count)
•
The frequency of the retrigger clock
The initial trigger source depends on the trigger acquisition mode you use; refer to
more information on the supported and trigger sources and trigger acquisition modes.
Externally-Retriggered scan mode
Use externally-retriggered scan mode if you want to accurately control the period between con-
versions of individual channels and retrigger the scan based on an external event. Like internal
retrigger scan mode, this mode allows you to acquire 262,144 samples per trigger (256 times per
trigger
€×
1024-location channel-gain list).
NOTE
Use externally-retriggered scan mode with continuous post-trigger
acquisitions only; refer to
for more information on post-
trigger acquisitions.
When a KPCI-3101–4 Series board detects an initial trigger (post-trigger source only), the board
scans the channel-gain list up to 256 times, then waits for an external retrigger to occur. You can
specify any supported post-trigger source as the initial trigger. Specify the external digital (TTL)
trigger for the retrigger.
When the retrigger occurs, the board scans the channel-gain list the specified number of times,
then waits for another external retrigger to occur. The process repeats continuously until either
the allocated buffers are filled (if buffer wrap mode is none) or until you stop the operation (if
buffer wrap mode is single or multiple); refer to
for more information on buffers.
The conversion rate of each channel is determined by the frequency of the A/D sample clock;
refer to
for more information on the A/D sample clock. The conversion rate of each
scan is determined by the period between external retriggers; therefore, it cannot be accurately
controlled. The board ignores external triggers that occur while it is acquiring data. Only exter-
nal retrigger events that occur when the board is waiting for a retrigger are detected and acted
on.
To select externally-retriggered scan mode, use software to specify the following parameters:
•
The dataflow as continuous (post-trigger)
•
The triggered scan mode usage as enabled
•
The retrigger mode as an external retrigger
•
The number of times to scan per trigger or retrigger (also called the multiscan count)
•
The retrigger source as the external digital (TTL) trigger
Содержание KPCI-3101 Series
Страница 1: ...User s Manual KPCI 3101 3102 3103 3104 Series PCI Bus Data Acquisition Boards 98150 Rev A 10 99...
Страница 10: ...iv...
Страница 15: ...1 Overview...
Страница 21: ...2 Principles of Operation...
Страница 53: ...3 Installation and Configuration...
Страница 78: ...3 26 Installation and Configuration KPCI 3101 KPCI 3104 Series User s Manual...
Страница 79: ...4 Testing the Board...
Страница 82: ...4 4 Testing the Board KPCI 3101 KPCI 3104 Series User s Manual...
Страница 83: ...5 Calibration...
Страница 86: ...5 4 Calibration KPCI 3101 KPCI 3104 Series User s Manual...
Страница 87: ...6 Troubleshooting...
Страница 94: ...6 8 Troubleshooting KPCI 3101 KPCI 3104 Series User s Manual...
Страница 95: ...A Specifications...
Страница 107: ...B Connector Pin Assignments...
Страница 111: ...C Systematic Problem Isolation...
Страница 145: ...This page intentionally left blank...
Страница 146: ...Keithley Instruments Inc 28775 Aurora Road Cleveland Ohio 44139 Printed in the U S A...