VXI VT1538A user manual SENSePERiodAPERture

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[SENSe:]PERiod:APERture

[SENSe:]PERiod:APERture <aperture>,<ch_list> sets the time allowed to determine signal period and return a reading to the algorithm. When APERture is large enough to contain more than one signal period, the SCP measures and averages the number of signal periods that will fit within this APERture time. If the specified APERture is less than the input signal period, the SCP stretches the aperture in order to measure at least one signal period. This is known a Adaptive Aperture.

Parameters


	Parameter	Parameter	Range of	Default
	Name	Type	Values	Units

	aperture	numeric (float32)	see text	seconds

	ch_list	string	100 - 163	none

Comments • The range for <aperture> is dependent on SENS:PER:RANGE:

--When SENS:PER:RANGE is 1, <aperture> can range from .001 to

1second.

--When SENS:PER:RANGE is 4, <aperture> can range froom .004 to

4seconds.

•For APERture to effect the measurement, SENS:PER:MODE must be set to APERture.

•If the channels specified are on an SCP that doesn’t support this function, an error will be generated. See your SCP’s User’s Manual for its capabilities.

•Related Commands: SENS:PER:MODE, SENS:PER:NPERiods, SENS:PER:LIM:UPPer, SENS:PER:RANGE, SENS:FUNC:PER

•*RST Condition: .001 sec

•Send with VXIplug&play Function: hpe14XX_cmd(...)

Usage SENS:PER:APER .01,(@144)	set channel 44 aperture to
	10msec

56 Agilent E1538A Enhanced Frequency/Totalize/PWM SCP

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Contents VT1538A VXI Technology, Inc Introduction Support Resources User’s and Scpi Programming Manual Page Agilent E1538A Enhanced Frequency/Totalize/PWM SCP About this ManualIntroduction Identifying the Plug-on Important Setting Configuration Switches Switch Location and Example SettingsInstallation Connecting To The Terminal ModuleRecommended Signal Connections E1419A Option 11 Terminal Module ConnectionsInput and Output Characteristics Recommended Connections and Voltage LimitsVRS Mode Input Operation SCP Channels 0 & 1 only E1538A Input/Output CharacteristicsProgramming With Scpi Commands Shows the VRS mode input characteristicsConfiguring I/O Direction Setting the Input Threshold LevelDetermining the Input Threshold Level Inppol NormReading Static Digital State To set channels 40 through 43 to input digital statesTotalize Positive or Negative Edge State Changes Init SENSDATACVT? @44About Period Frequency Measurements SENSDATACVT? @45 SENSDATACVT? @45 Agilent E1538A Enhanced Frequency/Totalize/PWM SCP Agilent E1538A Enhanced Frequency/Totalize/PWM SCP Sense Quadrature Position Sensfuncquad 0,@148,149RPS Example of Rotational Velocity Sense Sense Rotational VelocityControlling Output Polarity Output Static Digital StateVariable Width Pulse Per Trigger Variable Width Pulse Train PWM Variable Frequency Fixed Width Pulse Train FM Variable Frequency Square-Wave Pulse Train Rotationally Positioned Pulse Output Rotational Pulse Command Usage Algupdate Init Example of variable position, preset width RST Sensfuncrvel 12,MISS,@140Variable Position, Width Preset by Time Example of variable width by angle, preset position Example of variable width by time, preset position Fixed Position, Variable Width by AngleALGSCALAR’ALG1’,’Width2’,.010 Stepper Motor Control Use the command Stepping mode valuesSensfuncvolt @100 Full Step Mode, Full and Half Speed, 4-Channel Page RST and *TST important Scpi Command Reference Command Syntax For newer Units onlyCommand Syntax For newer Units only Discussed INPutPOLarity INPutPOLarity?Parameters CommentsLevel can be set to a resolution INPutTHResholdLEVelINPutTHResholdLEVel? OUTPutPOLarity OUTPutPOLarity?Send with VXIplug&play Function hpe14XXcmdReal64Q SENSeFREQuencyAPERture Related Commands Sensfreqaper SENSeFREQuencyAPERture?SENSeFREQuencyLIMitLOWer Init Related Commands INPutPOLarity SENSeFREQuencyLIMitLOWer?SENSeFUNCtionCONDition SENSeFUNCtionFREQuency SENSeFUNCtionPERiodSENSeFUNCtionPWIDth SENSeFUNCtionQUADratureSENSeFUNCtionRVELocity RPS SENSeFUNCtionTOTalize SENSePERiodAPERture SENSePERiodAPERture? SENSePERiodLIMitUPPerInit SENSePERiodLIMitUPPer? SENSePERiodMODERelated Commands SENSePERiodMODE SENSePERiodMODE?SENSePERiodNPERiods SENSePERiodNPERiods? SENSePERiodRANGeUPPerSend with VXIplug&play Function hpe14XXcmdInt32Q SENSeTOTalizeRESetMODE SENSePERiodRANGeUPPer?RST Condition is Send with VXIplug&play Function hpe14XXcmd SENSeTOTalizeRESetMODE? SOURceFMSTATeSOURceFMSTATe? Send with VXIplug&play Function hpe14XXcmdInt16QSOURceFUNCtionRPULse SOURceFUNCtionSHAPeCONDition SOURceFUNCtionSHAPePULSeSOURceFUNCtionSHAPeSQUare SOURceFUNCtionSTEPperComments Send with VXIplug&play Function hpe14XXcmd Relationship of minvel, and maxvel SOURcePULMSTATe Usage See Stepper Motor Control onSOURcePULMSTATe? SOURcePULSePERiodSOURcePULSePERiod? SOURcePULSeWIDThSOURcePULSeWIDTh? SOURceRPULsePOSitionANGLe33,554,430 to 33,554,430 SOURceRPULsePOSitionANGLe? SOURRPULseVARTypeUsage SOURRPULseVARType? SOURceRPULseWIDThANGLeSOURceRPULseWIDThANGLe? SOURceRPULseWIDThTIME00000787 to SOURceRPULseWIDThTIME? Specifications General SpecificationsFrequency Measurement Pulse Width Measure Rotational Pulse Source