VXI VT1538A user manual Rps

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Parameters


	Parameter	Parameter	Range of	Default
	Name	Type	Values	Units

	N_teeth	numeric (int32)	3 to 255	none

	index_type	string	MISSing EXTRa	none

	ch_list	string	100 - 163	none

Comments • This function can only be linked to the E1538’s first channel. The function works for wheels that have either a missing, or an extra tooth to mark their index position. Figure 14 on page 23 shows a wheel sensed with a variable reluctance sensor (using the VRS input option), but any wheel sensing method is applicable as long as it provides a digital output to the RVEL channel.

•1100, 000 The value read by the algorithm can range from --------------RPS to --------------------

RPS.

nteethnteeth

•As well as sensing rotational velocity, SENS:FUNC:RVEL provides the reference position to the SOUR:FUNC:RPULse function that generates angular positioned pulses. See page 30 for more information on RPULse.

•<n_teeth> is the number of teeth that the wheel would have if it didn’t have missing or extra teeth. For example, we would set <n_teeth> to 12 for the wheel shown in Figure 14 on page 23, even though with the missing tooth, there are only 11.

•<index_type> can be either of the strings "MISSing", or "EXTRa"

•<ch_list> must be the first channel on the SCP, but can contain more than one channel provided that each channel is on a separate E1538. See following note. The related Error Messages are:

3110, "Channel specified is invalid for RVELocity function.

Note Only one channel on any E1538 SCP can be assigned to the SENS:FUNC:RVEL function, and it must be the first channel on the SCP.

•*RST Condition: SENS:FUNC:COND and INP:POL NORM for all digital SCP channels.

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

Usage See “Sense Rotational Velocity” on page 22.

SENSE:FUNC:RVEL 12,MISSING,(@140)

12 toothed wheel with one missing, from channel 40

54 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 Parameters INPutPOLarityINPutPOLarity? CommentsINPutTHResholdLEVel Level can be set to a resolutionINPutTHResholdLEVel? OUTPutPOLarity? OUTPutPOLaritySend with VXIplug&play Function hpe14XXcmdReal64Q SENSeFREQuencyAPERture SENSeFREQuencyAPERture? Related Commands SensfreqaperSENSeFREQuencyLIMitLOWer Init SENSeFREQuencyLIMitLOWer? Related Commands INPutPOLaritySENSeFUNCtionCONDition SENSeFUNCtionFREQuency SENSeFUNCtionPERiodSENSeFUNCtionPWIDth SENSeFUNCtionQUADratureSENSeFUNCtionRVELocity RPS SENSeFUNCtionTOTalize SENSePERiodAPERture SENSePERiodAPERture? SENSePERiodLIMitUPPerInit SENSePERiodLIMitUPPer? SENSePERiodMODESENSePERiodMODE? Related Commands SENSePERiodMODESENSePERiodNPERiods SENSePERiodRANGeUPPer 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 Relationship of minvel, and maxvel SOURcePULMSTATe Usage See Stepper Motor Control onSOURcePULMSTATe? SOURcePULSePERiodSOURcePULSePERiod? SOURcePULSeWIDThSOURceRPULsePOSitionANGLe SOURcePULSeWIDTh?33,554,430 to 33,554,430 SOURRPULseVARType SOURceRPULsePOSitionANGLe?Usage SOURRPULseVARType? SOURceRPULseWIDThANGLeSOURceRPULseWIDThTIME SOURceRPULseWIDThANGLe?00000787 to SOURceRPULseWIDThTIME? Specifications General SpecificationsFrequency Measurement Pulse Width Measure Rotational Pulse Source