Omega 1002 manual Symbol Name Minimum Maximum

Page 37

The A/D trigger logic can initiate an A/D conversion upon an external trigger. Valid external trigger signals must be TTL compatible and meet minimum pulse width requirements. The requirements are shown below:

External trigger

tdu tre

Symbol

Name

Minimum

Maximum

 

 

 

 

Tdu

Duration time

40ns

Tre

Recover time

100ns

Note: The OME-PCI-1002 is designed only for time sensitive triggers (trigger is dependent only on the time of the falling edge of signal). For a level sensitive external trigger (trigger is dependent on the level of the input signal), the user can build the following external circuit the OME-PCI-1002:

Input Signal

OME-PCI- DAC 1002 D/O

Comparator

External

Trigger

TTL buffer

37

Image 37
Contents User’sGuide Servicing North America Table of Contents Software and Demo Program Diagnostic Program General Description IntroductionX86 System Block DiagramFeatures Power Consumption SpecificationsAnalog Inputs 4 A/D Trigger Methods 3 D/I and D/OInterrupt Channel Programmable Timer/CounterOME-PCI-1002 series multifunction cards ApplicationsRelease Notes Product Check ListBoard Layout Hardware ConfigurationA/D Calibration Jumper SettingOME-PCI-1002 System Function Block System Block DiagramOME-DB-8225 OME-DB-37 Daughter BoardsOME-DB-16P Isolated Input Board OME-DB-16R Relay Board Analog Input Signal Connection Page Page Signal Shielding Jumper Settings Connectors Page O Registers How to Find the I/O AddressPage I/O Address Map Section 8254 Registers Status Register Clear Interrupt Interrupt Source Selection General Control RegisterTrigger Method Selection Digital I/O Function OperationA/D trigger 8254 TimerSymbol Name Minimum Maximum CPU A/D ConversionSuggested Settling Times 1 A/D Conversion Trigger Modes Software Trigger and Polling Techniques Page Page Software and Demo Program Driver Plug & Play Test Power-ON Plug & Play TestA/D Test D I/O TestWARRANTY/DISCLAIMER Temperature