Omega Engineering OMB-1108-0901 用户手册
DaqTemp User’s Manual
09-06-02
Overview & Theory of Operation 1-7
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Variable pre-trigger with post trigger stop event (driver support only). Unlike the previous pre-
trigger modes, this mode does not have to satisfy the pre-trigger number of readings before
recognizing the trigger event. Thus the number of pre-trigger readings acquired is variable and
dependent on the time of the trigger event relative to the start. In this mode, data continues to be
acquired until the stop trigger event is detected.
trigger modes, this mode does not have to satisfy the pre-trigger number of readings before
recognizing the trigger event. Thus the number of pre-trigger readings acquired is variable and
dependent on the time of the trigger event relative to the start. In this mode, data continues to be
acquired until the stop trigger event is detected.
•
Variable pre-trigger with infinite post trigger (driver support only). This is similar to the mode just
described, except that the acquisition is terminated upon receipt of a command from the program.
described, except that the acquisition is terminated upon receipt of a command from the program.
•
Stop Trigger. Any of the software trigger modes described above can be used to stop an acquisition.
Thus an acquisition can be programmed to begin on one event, such as a temperature level, and then
stopped on another, such as a digital pattern event.
Thus an acquisition can be programmed to begin on one event, such as a temperature level, and then
stopped on another, such as a digital pattern event.
Theory of Operation
As implied by the following matrix, the operational material does not apply globally to every DaqTemp
Series PCI board. For example, the PCI boards for DaqTemp7 and DaqTemp14 have no analog output.
Series PCI board. For example, the PCI boards for DaqTemp7 and DaqTemp14 have no analog output.
I/O Comparison Matrix
I/O Comparison Matrix
for DaqTemp Series PCI Boards
DaqTemp
PCI Board
Thermocouple
Channels
Analog Input
Channels
Analog Output
Channels
Digital I/O
Channels
Counter/
Timers
DaqTemp7A
7
7
2
24
4 Counters
2 Timers
2 Timers
DaqTemp14A
14
7
4
24
4 Counters
2 Timers
2 Timers
DaqTemp7
7
7
0
24
4 Counters
2 Timers
2 Timers
DaqTemp14
14
7
0
24
4 Counters
2 Timers
2 Timers
Synchronous Input Operations
The DaqTemp Series devices allow synchronous scanning and acquisition of Analog Input, Digital Input
and Counter Input Data at up to 200 kHz aggregate scanning rates. The Analog Input data can be either
voltage input or thermocouple input channels. The Digital Input data can be any of the 8-bit ports,
designated as Port A (A0 through A7), Port B (B0 through B7), and Port C (C0 through C7).
and Counter Input Data at up to 200 kHz aggregate scanning rates. The Analog Input data can be either
voltage input or thermocouple input channels. The Digital Input data can be any of the 8-bit ports,
designated as Port A (A0 through A7), Port B (B0 through B7), and Port C (C0 through C7).
T/C