Omega OMB-DAQBOARD-500 Stopping an ADC Acquisition CLOCK, ADC Clock and FIFO Errors, ADC Software

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Stopping an ADC Acquisition (CLOCK)

Stopping an ADC Acquisition (CLOCK)

Typical ways of halting an acquisition involve use of one of the following:

oSoftware

oExternal Gate (ADTRGIN) o External Trigger (ADTRGIN)

ADC Software

The acquisition can be stopped by software control.

ADC External Gate

An ADC clock may also be “switched off” with the external trig/gate input (ADTRGIN).

Refer to the section entitled ADC External Gate (on page 4-5 ) for additional information about this mode.

ADC External Trigger

The external gate/trig input (ADTRGIN) may also be used to stop an acquisition. In this mode, referred to as ABOUT Trigger Mode, the ADC is disabled after a certain number of conversions are performed following a trigger. The number of conversions may be anywhere from 1 to 65,536, which represents the number of post trigger conversions. Once triggered the ADC Conversion Counter immediately increments after each conversion until it reaches 0, whereupon ADC conversions are automatically disabled. If the timer is loaded with a value of -1 the ADC will be stopped after one valid clock. If this register is loaded with the value 0 the full count (65,536 conversions) will occur.

Note that the Software and External Gate modes described in the section entitled Starting (Triggering) an ADC Acquisition (page 4-5 ) are ignored, i.e., the trigger source is always external when in the ABOUT Trigger Mode.

If the External Trigger input is disabled, conversions are enabled as soon as the ADC is enabled and the next valid trigger will enable the internal counter to count conversions. If the External Trigger input is enabled, the first external trigger will start the conversions and the next valid trigger will enable the internal counter to count conversions.

ADC Clock and FIFO Errors

If the ADC is running in DMA operating modes the board will automatically interrupt if clock errors or FIFO overflows become active.

4-6 Software and Board Operation

988994

DaqBoard/500 Series

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Contents OMB-DAQBOARD-500 Series 16-Bit, 200-KHz PCI Data Acquisition BoardsUser’s Guide Shop online atServicing North America OMEGAnet Online Service omega.comInternet e-mail info@omega.com For immediate technical or application assistanceSpecifications and Calibration Warnings, Cautions, Notes, and Tips⇒ Programs ⇒ Omega DaqX Software 3 - Configuration Table of ContentsOMB-DAQBOARD-500 Series, Installation Guide 1 - Introduction 6 - Specifications GlossaryWindows Windows XP This product requires one of the following Operating SystemsDaqView/500 Authorization Code OMB-DAQBOARD-500 SeriesInstallation Guide Reference NoteInstallation, A Pictorial Overview Step 1 - Install SoftwareIMPORTANT Software must be installed before installing hardware Reference NotesIMPORTANT Bus Mastering DMA must be Enabled Step 2 - Install Boards in available PCI Bus-slots2. Remove the PC’s cover. Refer to your PC Owner’s Manual as needed 9. Secure the board by inserting the rear-panel adapter-plate screw Step 3 - Configure Boards Accessing the DaqBoard/500 Properties TabStep 4 - Test Hardware Using “Add Device”Test Hardware Tab Introduction Basic InformationDaqBoard/500 Series Block Diagram Block DiagramDaqBoard/500 Series User’s Manual Analog I/O Board FeaturesTimer 0 and Timer Digital I/ODaqBoard/500 Series User’s Manual Connections and Pinouts OverviewSignal 68-Pin SCSI Type III PinoutStandard 68-Pin SCSCI Type III, Socket Female Connector with Orb PowerDifferential Channels, Pin Reference Signal DefinitionsAnalog Input Channels HI + Pin #Clocks, Triggers, Counters, and Timers Power Line Ground LinesScrew Terminals for TB1 Side TB-100 Terminal Connector OptionScrew Terminals for TB2 Side 2-6 Connections & PinoutsDifferential Channels Screw Terminal Reference Connecting User WiringExternal Connections HI +Single-Ended Configuration Signal TypesChoosing A/D Input Configuration Single-EndedDifferential for Grounded Signal Sources Differential DIFFDifferential Configuration for Grounded Sources If the Input Signal is AC Coupled Differential for Floating Signal SourcesIf the Input Signal is DC Coupled Differential Configuration for Floating SourcesAnalog Input Configuration ConfigurationConfiguration through Software ADC RangesRange Configuration DAC RangesDAC OUTPUT DaqBoard/500 DAC Range Resolution Microvolt ResolutionOverview …… Out-of-the-BoxTM Software …… Software and Board OperationOut-of-theBoxTM Software Drivers for Third-party, Icon-driven Software …… DaqCOM Driver ……LabVIEW Drivers for Third-party, Icon-driven SoftwareDaqCOM Driver 4-2 Software and Board OperationTheory of Operation Process DefinitionsADC External Event Clocking Clocking the ADCADC Pacer Clocking ADC Maximum Clock RateADC External Gate Starting Triggering an ADC AcquisitionADC Software ADC External TriggerADC Clock and FIFO Errors Stopping an ADC Acquisition CLOCKClocking the DAC Digital AcquisitionDAC Software Update DaqBoard/500 Only4-8 Software and Board Operation Overview ……5-1 CE Standards and Directives …… Safety Conditions ……5-2 CE-ComplianceCE Standards and Directives Emissions/Immunity Conditions ……5-2Safety Conditions Emissions/Immunity ConditionsAnalog Inputs SpecificationsGeneral of calibrationAnalog Input Triggering/Clocking 6-2 SpecificationsDigital Inputs / Outputs Analog Outputs DaqBoard/500 OnlyPhysical & Environmental Counter - 1 Counter designated as CNTR1Glossary single-ended modereferenced to common Page Page WARRANTY/DISCLAIMER RETURN REQUESTS/INQUIRIESOMEGA…Of Course 324545A-01Shop online at omega.com TEMPERATURE