KPCI-3101 — KPCI-3104 Series User’s Manual
Triggers
A trigger is an event that occurs based on a specified set of conditions. The KPCI-3101–4 Series
boards support a number of trigger sources and trigger acquisition modes, described in the fol-
lowing subsections.
Trigger sources
The KPCI-3101–4 Series board supports a software trigger and an external digital (TTL) trigger.
A software trigger event occurs when you start the analog input operation (the computer issues a
write to the board to begin conversions). Specify the software trigger source in software.
An external digital trigger event occurs when the KPCI-3101–4 Series board detects either a ris-
ing or falling edge on the External TTL Trigger input signal connected to screw terminal TB46
on the STA-300 screw terminal panel (pin 56 of connector J1). The trigger signal is TTL-com-
patible. Using software, specify the trigger source as a rising-edge external digital trigger
or fall-
ing-edge external digital trigger.
Trigger acquisition modes
KPCI-3101–4 Series boards can acquire data in post-trigger mode, pre-trigger mode, or about-
trigger mode. These trigger acquisition modes are described in more detail in the following sub-
sections.
Post-Trigger acquisition
Use post-trigger acquisition mode (continuous mode) when you want to acquire data when a
post-trigger or retrigger, if using triggered scan mode, occurs.
Using DriverLINX software, specify
•
The dataflow as continuous, and
•
The trigger source to start the post-trigger acquisition (the post-trigger source) as any of the
supported trigger sources.
Refer to
for more information on the supported conversion modes; refer to
for information on the supported trigger sources.
Post-trigger acquisition starts when the board detects the post-trigger event and stops when the
specified number of post-trigger samples has been acquired or when you stop the operation.
If you are using triggered scan mode, the board continues to acquire post-trigger data using the
specified retrigger source to clock the operation. Refer to
gered scan mode.
illustrates continuous post-trigger mode using a channel-gain list with three entries:
channel 0, channel 1, and channel 2. Triggered scan mode is disabled. In this example, post-
trigger analog input data is acquired on each clock pulse of the A/D sample clock. When it
reaches the end of the channel-gain list, the board wraps to the beginning of the channel-gain list
and repeats this process. Data is acquired continuously (continuously-paced scan mode).
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...