VXI VT1538A SENSePERiodMODE?, SENSePERiodNPERiods, Related Commands SENSePERiodMODE, Parameters

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SENSe:PERiod:MODE?

<ch_list> must be channels on an E1538A SCP.

SENSe:PERiod:MODE?

SENSe:PERiod:MODE? (@<channel>) returns the measurement

interval mode currently set for period measurement.

Parameters


	Parameter	Parameter	Range of	Default
	Name	Type	Values	Units

	channel	string	100 - 163	none

Comments •

•

•

SENSe:PERiod:NPERiods

<channel> must be a single channel on an E1538A SCP.

RETURNS: String value "APER" or "NPER", Type is String

.Send with VXIplug&play Function: hpe14XX_cmdString_Q(...)

SENSe:PERiod:NPERiods <count>,(@<ch_list>) sets the number of

signal periods to measure and average in order to compute the input signal period.

Parameters


	Parameter	Parameter	Range of	Default
	Name	Type	Values	Units

	count	numeric (uint32)	1 to 255 MINimum MAXimum	seconds

	ch_list	string	100 - 163	none

Comments •

•This feature is only available when the NPERiods period mode is in use: SENSe:PERiod:MODE NPERiods,<ch_list>

•Related Commands: SENSe:PERiod:MODE

•RESET Condition: is “MINimum” (i.e. 1).

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

60 Agilent E1538A Enhanced Frequency/Totalize/PWM SCP

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Contents 82-0093-000 Release April 28 VXI Technology, Inc 2031 Main Street Irvine, CA 949ENHANCED FREQUENCY/TOTALIZE/ PWM SIGNAL CONDITIONING PLUG-ON VT1538AVXI Technology, Inc Dynamic DAC Products INTRODUCTIONStatic DAC Products SUPPORT RESOURCES VXI Technology World HeadquartersVXI Technology Cleveland Division VXI Technology Lake Stevens Instrument DivisionUser’s and SCPI Programming Manual Signal Conditioning Plug-onAgilent Technologies E1538A Enhanced Frequency/Totalize/PWM Agilent 75000 Series CPage About this Manual Agilent E1538A Enhanced Frequency/Totalize/PWM SCPIntroduction Identifying the Plug-on IMPORTANT Configuring Input- Output direction Setting Configuration SwitchesConfiguring Channel Pull-up Resistor Installation Connecting To The Terminal ModuleFigure 4. E1419A Option 11 Terminal Module Connections Recommended Signal Connections8 Agilent E1538A Enhanced Frequency/Totalize/PWM SCP Input and Output Characteristics VRS Mode Input Operation SCP channels 0 & 1 only Programming With SCPI Commands Configuring the Channels Configuring I/O DirectionSetting the Input Threshold Level Checking the ID of the SCPDetermining the Input Threshold Level returns threshold valueReading Static Digital State To set channels 40 through 43 to input digital statesTotalize Positive or Negative Edge State Changes About Period and Frequency Measurements To measure frequency at channel 45 with aperture of 1 second For PERiod function, the E1538 spports two distinct measurement ranges To measure period at channel 45 as the average of 1000 signal periods chlist specifies the channels that will read pulse widths Sense Quadrature Position The value read by the algorithm can range from Example of Rotational Velocity Sense Controlling Output Polarity Programming Output ChannelsOutput Static Digital State Variable Width Pulse Per Trigger Figure 17. Output Pulse-Width-Modulated Signal Variable Width Pulse Train PWM26 Agilent E1538A Enhanced Frequency/Totalize/PWM SCP Variable Frequency Fixed Width Pulse Train FM Figure 19. Output Square Wave Variable Frequency FM Variable Frequency Square-Wave Pulse Train FM28 Agilent E1538A Enhanced Frequency/Totalize/PWM SCP Rotationally Positioned Pulse Output Rotational Pulse Command Usage Variable Angular Position, Preset Pulse Width by angle Rotational Pulse ModeVariable Angular Position, Preset Pulse Width by time Example of variable position, preset widthFigure 21. Variable Position, Width Preset by Angle 32 Agilent E1538A Enhanced Frequency/Totalize/PWM SCPVariable Pulse Width by angle, Preset Angular Position Figure 22. Variable Position, Width Preset by TimeExample of variable width by angle, preset position 34 Agilent E1538A Enhanced Frequency/Totalize/PWM SCPVariable Pulse Width by time, Preset Angular Position Example of variable width by time, preset positionpreset ch 46 pulse width to 10ms preset ch 47 pulse width to 15msFigure 24. Fixed Position, Variable Width by Time 36 Agilent E1538A Enhanced Frequency/Totalize/PWM SCPStepper Motor Control Use the command motor phase channel group can not be split across SCPs Figure 27. Full Step Mode, Full and Half Speed, 4-Channel Figure 28. Half Step Mode, Full Speed, 4-ChannelFigure 29. Directly Driving 4-Phase Stepper Motors 40 Agilent E1538A Enhanced Frequency/Totalize/PWM SCPRST and *TST important SCPI Command Reference Command SyntaxFor newer PageDiscussed INPutPOLarity INPutPOLarity?Parameters CommentsINPutTHResholdLEVel level can be set to a resolution ofINPutTHResholdLEVel? OUTPutPOLarity OUTPutPOLarity?Send with VXIplug&play Function hpe14XXcmdReal64Q generatedSENSeFREQuencyAPERture RST Condition .001 sec Send with VXIplug&play Function hpe14XXcmdSENSeFREQuencyAPERture? Related Commands SENSFREQAPERSENSeFREQuencyLIMitLOWer INIT Related Commands INPutPOLarity SENSeFREQuencyLIMitLOWer?SENSeFUNCtionCONDition Returned Value .01667 to 250, The type is float32SENSeFUNCtionFREQuency SENSeFUNCtionPERiodSENSeFUNCtionPWIDth SENSeFUNCtionQUADratureSENSeFUNCtionRVELocity Usage See “Sense Quadrature Position” on pageUsage See “Sense Rotational Velocity” on page 54 Agilent E1538A Enhanced Frequency/Totalize/PWM SCPSENSeFUNCtionTOTalize Usage See “Totalize Positive or Negative Edge State Changes” on pageSENSePERiodAPERture SENSePERiodAPERture? SENSePERiodLIMitUPPer58 Agilent E1538A Enhanced Frequency/Totalize/PWM SCP SENSePERiodLIMitUPPer? SENSePERiodMODERST Condition is “APERture” SENSePERiodMODE mode,@chlist selects the measurementRelated Commands SENSePERiodMODE SENSePERiodMODE?SENSePERiodNPERiods interval mode currently set for period measurementSENSePERiodRANGeUPPer SENSePERiodNPERiods?Send with VXIplug&play Function hpe14XXcmdInt32Q SENSePERiodRANGeUPPer? SENSeTOTalizeRESetMODERST Condition is Send with VXIplug&play Function hpe14XXcmd SENSeTOTalizeRESetMODE? SOURceFMSTATeSOURceFMSTATe? Send with VXIplug&play Function hpe14XXcmdInt16QSOURceFUNCtionRPULse SOURceFUNCtionSHAPeCONDition SOURceFUNCtionSHAPePULSeSOURceFUNCtionSTEPper SOURceFUNCtionSHAPeSQUareComments Send with VXIplug&play Function hpe14XXcmd Figure 31. Relationship of minvel, and maxvel Table 3. Stepping mode values68 Agilent E1538A Enhanced Frequency/Totalize/PWM SCP SOURcePULMSTATe Usage See “Stepper Motor Control” on pageSOURcePULMSTATe? SOURcePULSePERiodSOURcePULSePERiod? SOURcePULSeWIDThSOURceRPULsePOSitionANGLe SOURcePULSeWIDTh?33,554,430 to 33,554,430 SOURRPULseVARType SOURceRPULsePOSitionANGLe?Usage SOURceRPULseWIDThANGLe SOURRPULseVARType?74 Agilent E1538A Enhanced Frequency/Totalize/PWM SCP SOURceRPULseWIDThTIME SOURceRPULseWIDThANGLe?00000787 to Usage SOURRPULSEWIDTTIME? @147 SOURceRPULseWIDThTIME?76 Agilent E1538A Enhanced Frequency/Totalize/PWM SCP Specifications General SpecificationsOutput Characteristics Input Characteristics1 mSec to 1 Second, resolution Resolution HzTotalizer Frequency MeasurementRotational Velocity Measure Pulse Width MeasureFrequency Source Pulse SourceCharacteristics Rotational Pulse Source80 Agilent E1538A Enhanced Frequency/Totalize/PWM SCP Extra Tooth Wheel