Omega OMB-DAQSCAN-2000 Series Manuale Utente

DaqScan/2000 Series 

898195

 

Taking Measurements      8-3 

 

Pre- and Post-Triggering Modes. Six modes of pre- and post-triggering are supported, 

providing a wide variety of options to accommodate any measurement requirement. When 

using pre-trigger, the user must use software-based triggering to initiate an acquisition. 

• 

No pre-trigger, post-trigger stop event. This, the simplest of modes, acquires 

data upon receipt of the trigger, and stops acquiring upon receipt of the stop-

trigger event. 

• 

Fixed pre-trigger with post-trigger stop event. In this mode, the user 

specifies the number of pre-trigger readings to be acquired, after which, 

acquisition continues until a stop-trigger event occurs. 

• 

No pre-trigger, infinite post-trigger. No pre-trigger data is acquired in this 

mode. Instead, data is acquired beginning with the trigger event, and is 

terminated when the operator issues a command to halt the acquisition. 

• 

Fixed pre-trigger with infinite post-trigger. The user specifies the amount of 

pre-trigger data to acquire, after which the system continues to acquire data until 

the program issues a command to halt acquisition. 

• 

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. 

• 

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. 

• 

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. 

The DaqScan/2000 Series devices allow synchronous scanning and acquisition of Analog Input 

[for those models with a P1 connector], Digital Input and Counter Input Data at up to 200 kHz 

aggregate scanning rates.  When applicable, the Analog Input data can be either main unit 

(DaqScan/2001 or DaqScan/2005) or expansion modules from P1-compatible analog input 

modules.  The Digital Input data can be main unit 8-bit P2 (8255) digital input or from P2 

compatible DBK digital input expansion modules.  

DaqScan/2001 and DaqScan/2005 allow analog input configuration of themselves, as well as 

for any connected P1 compatible DBK analog input expansion modules. 

Channel Selection and Mode Settings  
DaqScan/2001 and DaqScan/2005 have P1 connectors that allow for expansion of up to 256 

high-speed channels, or 896 TC channels.  In regard to system expansion, refer to the DBK 

Option Cards & Modules User’s Manual (p/n 457-0905). 

Channel Range and Polarity 
The analog input channels of DaqScan/2001 and DaqScan/2005 can be programmed for gain 

settings of 1, 2, 4, 8, 16, 32, and 64.