Programming Examples - 3Triggering MeasurementsYou can use the data acquisition trigger system to synchronize the timing of the voltage and current dataacquisition with a trigger source. Then use the FETCh commands to return different calculations from thedata acquired by the measurement trigger.SCPI Triggering NomenclatureIn SCPI terms, trigger systems are called sequences. When more than one trigger system exists, theyare differentiated by naming them SEQuence1 and SEQuence2. SEQuence1 is the list trigger systemand SEQuence2 is the measurement trigger system. The electronic load uses aliases with moredescriptive names for these sequences. These aliases can be used instead of the sequence forms.Sequence Form AliasSEQuence2 ACQuireMeasurement Trigger ModelFigure 3-1 is a model of the measurement trigger system. The rectangular boxes represent states. Thearrows show the transitions between states. These are labeled with the input or event that causes thetransition to occur.INITIATED STATEIDLE STATEABORt*RCL*RSTTRIGGER RECEIVEDINITiate[:IMMediate]ACQUIREDSENSe:SWEep:POINtsNOYESTRIGger:COUNtCOMPLETE?DELAYING STATEDELAY COMPLETEDFigure 3-1. Model of Measurement Triggers35
