CompuScope SDK for L.. - Egmont Instruments

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Advanced Main VIsThe LabVIEW SDK contains “Advanced” VIs in addition to the documented Main VIs.Usage of some of these files may require special CompuScope hardware options, onboardfirmware processing images or special driver versions. These VIs are provided asiswith limited documentation in the form of on-line LabVIEW Help and/or anaccompanying explanatory text file.26 CompuScope SDK for LabVIEW for Windows
Chapter 4: Special TopicsConverting from CompuScope ADC Code to VoltagesSDK sample programs are configured to save or display CompuScope waveform datathat have been scaled so that the sample values are in Volts. The user may want tobypass the voltage conversion step, however, in order to achieve the best repetitivecapture performance. Voltage conversion may then be done at leisure in postprocessing.Raw ADC code waveform data may be converted to voltage data for all CompuScopemodels using the following equation:Offset − ADC_CodeVoltage =×Resolution( )Full Scale Input Voltage2+ DC _ OffsetThe Offset and Resolution for the CompuScope system may be obtainedprogrammatically using various SDK tools. The DC offset settings, supported only onnewer CompuScope models, must be added.For instance, for the CompuScope 82G, Offset=127 and Resolution=128. Let us assumethat the user has selected the +/-1 Volt Input Range, for a Full Scale Input Range of2 Volts. Let us further assume that the user has applied a 200 mV offset. For thisexample, therefore, the voltage conversion equation becomes:127 −Voltage =ADC_Code× 1 Volts + 0.2 Volts128Depth and Segment SizeOn all CompuScope models, on-board acquisition memory is arranged as a circular bufferfor Single Record acquisitions. This means that when the CompuScope is storingacquired data and it reaches the end of the memory, the memory counter rolls over. Datastorage wraps around the memory and starts digitizing into the beginning of memory. Theend of an acquisition is always initiated by the trigger event, after which the requestednumber of post-trigger data points is acquired and then the acquisition terminates. Thiscircular memory architecture allows the CompuScope to accumulate an amount of pretriggerdata of up to the amount of CompuScope acquisition memory per channel, less theamount of post-trigger data.Newer CompuScope models, such as the CS82G, CS12400, CS14200 and CS14105,allow for the accumulation of pre-trigger data in Multiple Record Mode. On these models,memory is divided into multiple circular buffers, the number of which is equal to thenumber of records specified. The Segment Size control allows the user to specify thesize of each circular buffer. This way, the user may select the amount of memoryreserved for pre-trigger data accumulation. For instance, if the user selects a post-triggerDepth of 2048 and a Multiple Record Segment Size of 8192, then up to 6144 Samples ofpre-trigger data may be acquired. Increasing the Segment Size beyond the Depth will27 CompuScope SDK for LabVIEW for Windows
Page 1 and 2: CompuScope Software Development Kit
Page 3 and 4: Table of ContentsPREFACE...........
Page 5 and 6: Chapter 1: Installation of CompuSco
Page 8 and 9: Overview of CompuScope Main VIsThe
Page 10 and 11: CsTool VIs are divided into six dif
Page 12 and 13: GageAcquire.viGageAcquire.vi is the
Page 14 and 15: • Trigger Delay - The time in sam
Page 16 and 17: GageCoerce.viGageCoerce.vi is ident
Page 18 and 19: GageMultipleRecord.viGageMultipleRe
Page 20 and 21: GageDeepAcquisition.viGageDeepAcqui
Page 22 and 23: GageComplexTriggerAcquire.viGageCom
Page 24 and 25: Note: This VI will coerce all confi
Page 28 and 29: accordingly reduce the maximum poss
Page 30 and 31: Representative Acquisition Sequence
Page 32: GaGe ProductsFor ordering informati

CompuScope SDK for L.. - Egmont Instruments

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