VXI VT1538A user manual To measure period at channel 45 as the average of 1000 signal periods

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To measure period at channel 45 as the average of 1000 signal periods:

*RST TRIGGER:TIMER .2 SENS:FUNC:PER (@145) SENS:PER:RANGE 1,(@145) SENS:PER:MODE NPER(@145) SENS:PER:NPER 1000,(@145) ALG:DEF ’ALG1’,’writecvt(I145,45);’

INIT do loop

SENS:DATA:CVT? (@45)

read value from CVT query above end loop

Alg executes at .2 sec intervals ch 45 to measure signal period set period range 10μsec - 1sec set meas interval by n periods meas and avg 1000 sig periods alg puts period in CVT

start algorithm execution

get period from CVT

Agilent E1538A Enhanced Frequency/Totalize/PWM SCP 19

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Contents VT1538A 82-0093-000 Release April 28 VXI Technology, Inc 2031 Main StreetIrvine, CA 949 ENHANCED FREQUENCY/TOTALIZE/ PWM SIGNAL CONDITIONING PLUG-ONVXI Technology, Inc Static DAC Products INTRODUCTIONDynamic DAC Products VXI Technology Lake Stevens Instrument Division SUPPORT RESOURCESVXI Technology World Headquarters VXI Technology Cleveland DivisionAgilent 75000 Series C User’s and SCPI Programming ManualSignal Conditioning Plug-on Agilent Technologies E1538A Enhanced Frequency/Totalize/PWMPage Agilent E1538A Enhanced Frequency/Totalize/PWM SCP About this ManualIntroduction Identifying the Plug-on IMPORTANT Configuring Channel Pull-up Resistor Setting Configuration SwitchesConfiguring Input- Output direction Connecting To The Terminal Module Installation8 Agilent E1538A Enhanced Frequency/Totalize/PWM SCP Recommended Signal ConnectionsFigure 4. E1419A Option 11 Terminal Module Connections Input and Output Characteristics VRS Mode Input Operation SCP channels 0 & 1 only Programming With SCPI Commands Checking the ID of the SCP Configuring the ChannelsConfiguring I/O Direction Setting the Input Threshold Levelreturns threshold value Determining the Input Threshold LevelTo set channels 40 through 43 to input digital states Reading Static Digital StateTotalize 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 Output Static Digital State Programming Output ChannelsControlling Output Polarity Variable Width Pulse Per Trigger 26 Agilent E1538A Enhanced Frequency/Totalize/PWM SCP Variable Width Pulse Train PWMFigure 17. Output Pulse-Width-Modulated Signal Variable Frequency Fixed Width Pulse Train FM 28 Agilent E1538A Enhanced Frequency/Totalize/PWM SCP Variable Frequency Square-Wave Pulse Train FMFigure 19. Output Square Wave Variable Frequency FM Rotationally Positioned Pulse Output Rotational Pulse Command Usage Rotational Pulse Mode Variable Angular Position, Preset Pulse Width by angle32 Agilent E1538A Enhanced Frequency/Totalize/PWM SCP Variable Angular Position, Preset Pulse Width by timeExample of variable position, preset width Figure 21. Variable Position, Width Preset by AngleFigure 22. Variable Position, Width Preset by Time Variable Pulse Width by angle, Preset Angular Position34 Agilent E1538A Enhanced Frequency/Totalize/PWM SCP Example of variable width by angle, preset positionExample of variable width by time, preset position Variable Pulse Width by time, Preset Angular Position36 Agilent E1538A Enhanced Frequency/Totalize/PWM SCP preset ch 46 pulse width to 10mspreset ch 47 pulse width to 15ms Figure 24. Fixed Position, Variable Width by TimeStepper Motor Control Use the command motor phase channel group can not be split across SCPs Figure 28. Half Step Mode, Full Speed, 4-Channel Figure 27. Full Step Mode, Full and Half Speed, 4-Channel40 Agilent E1538A Enhanced Frequency/Totalize/PWM SCP Figure 29. Directly Driving 4-Phase Stepper MotorsRST and *TST important Page SCPI Command ReferenceCommand Syntax For newerDiscussed Comments INPutPOLarityINPutPOLarity? ParametersINPutTHResholdLEVel? level can be set to a resolution ofINPutTHResholdLEVel generated OUTPutPOLarityOUTPutPOLarity? Send with VXIplug&play Function hpe14XXcmdReal64QRST Condition .001 sec Send with VXIplug&play Function hpe14XXcmd SENSeFREQuencyAPERtureSENSeFREQuencyLIMitLOWer Related Commands SENSFREQAPERSENSeFREQuencyAPERture? INIT Returned Value .01667 to 250, The type is float32 Related Commands INPutPOLaritySENSeFREQuencyLIMitLOWer? SENSeFUNCtionCONDitionSENSeFUNCtionPERiod SENSeFUNCtionFREQuencySENSeFUNCtionQUADrature SENSeFUNCtionPWIDthUsage See “Sense Quadrature Position” on page SENSeFUNCtionRVELocity54 Agilent E1538A Enhanced Frequency/Totalize/PWM SCP Usage See “Sense Rotational Velocity” on pageUsage See “Totalize Positive or Negative Edge State Changes” on page SENSeFUNCtionTOTalizeSENSePERiodAPERture SENSePERiodLIMitUPPer SENSePERiodAPERture?58 Agilent E1538A Enhanced Frequency/Totalize/PWM SCP SENSePERiodMODE mode,@chlist selects the measurement SENSePERiodLIMitUPPer?SENSePERiodMODE RST Condition is “APERture”interval mode currently set for period measurement Related Commands SENSePERiodMODESENSePERiodMODE? SENSePERiodNPERiodsSend with VXIplug&play Function hpe14XXcmdInt32Q SENSePERiodNPERiods?SENSePERiodRANGeUPPer RST Condition is Send with VXIplug&play Function hpe14XXcmd SENSeTOTalizeRESetMODESENSePERiodRANGeUPPer? SOURceFMSTATe SENSeTOTalizeRESetMODE?Send with VXIplug&play Function hpe14XXcmdInt16Q SOURceFMSTATe?SOURceFUNCtionRPULse SOURceFUNCtionSHAPePULSe SOURceFUNCtionSHAPeCONDitionComments Send with VXIplug&play Function hpe14XXcmd SOURceFUNCtionSHAPeSQUareSOURceFUNCtionSTEPper 68 Agilent E1538A Enhanced Frequency/Totalize/PWM SCP Table 3. Stepping mode valuesFigure 31. Relationship of minvel, and maxvel Usage See “Stepper Motor Control” on page SOURcePULMSTATeSOURcePULSePERiod SOURcePULMSTATe?SOURcePULSeWIDTh SOURcePULSePERiod?33,554,430 to 33,554,430 SOURcePULSeWIDTh?SOURceRPULsePOSitionANGLe Usage SOURceRPULsePOSitionANGLe?SOURRPULseVARType 74 Agilent E1538A Enhanced Frequency/Totalize/PWM SCP SOURRPULseVARType?SOURceRPULseWIDThANGLe 00000787 to SOURceRPULseWIDThANGLe?SOURceRPULseWIDThTIME 76 Agilent E1538A Enhanced Frequency/Totalize/PWM SCP SOURceRPULseWIDThTIME?Usage SOURRPULSEWIDTTIME? @147 Input Characteristics SpecificationsGeneral Specifications Output CharacteristicsFrequency Measurement 1 mSec to 1 Second, resolutionResolution Hz TotalizerPulse Source Rotational Velocity MeasurePulse Width Measure Frequency SourceExtra Tooth Wheel CharacteristicsRotational Pulse Source 80 Agilent E1538A Enhanced Frequency/Totalize/PWM SCP