Input and Output Characteristics | VXI VT1538A specs

Figure 5. Recommended Connections and Voltage Limits

Input and Output Characteristics

This section describes the E1538’s channel input and output electrical characteristics. Refer to Figure 6 for the following discussions.

Input Characteristics When configured for input, E1538 channels provide digital input through the threshold comparator. The digital input threshold level is programmable with a SCPI command from -48 to +47.625 VDC in .375V steps (relative to the Lnn terminal). The threshold amplifier also provides typically 0.5 volts of hysteresis regardless of the threshold level setting. The input impedance in this configuration is greater than 100KΩ (as long as the 10KΩ pull-up resistor is OFF).

Channels 0 and 1 also provide the capability (when the VRS switch is ON) to read the output of variable reluctance sensors. Because the output of a VRS varies in relation to the velocity of the toothed wheel it is reading, the E1538A provides adaptive amplifiers for these channels. The function of the amplifier

Agilent E1538A Enhanced Frequency/Totalize/PWM SCP 9

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VXI VT1538A user manual Input and Output Characteristics, Recommended Connections and Voltage Limits

Contents

VT1538A VXI Technology, Inc Introduction Support Resources User’s and Scpi Programming Manual Page About this Manual Agilent E1538A Enhanced Frequency/Totalize/PWM SCP Introduction Identifying the Plug-on Important Switch Location and Example Settings Setting Configuration Switches Connecting To The Terminal Module Installation E1419A Option 11 Terminal Module Connections Recommended Signal Connections Recommended Connections and Voltage Limits Input and Output Characteristics E1538A Input/Output Characteristics VRS Mode Input Operation SCP Channels 0 & 1 only Shows the VRS mode input characteristics Programming With Scpi Commands Setting the Input Threshold Level Configuring I/O Direction Inppol Norm Determining the Input Threshold Level To set channels 40 through 43 to input digital states Reading Static Digital State Init SENSDATACVT? @44 Totalize Positive or Negative Edge State Changes About Period Frequency Measurements SENSDATACVT? @45 SENSDATACVT? @45 Agilent E1538A Enhanced Frequency/Totalize/PWM SCP Agilent E1538A Enhanced Frequency/Totalize/PWM SCP Sensfuncquad 0,@148,149 Sense Quadrature Position RPS Sense Rotational Velocity Example of Rotational Velocity Sense Output Static Digital State Controlling Output Polarity Variable 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 RST Sensfuncrvel 12,MISS,@140 Example of variable position, preset width Variable Position, Width Preset by Time Example of variable width by angle, preset position Fixed Position, Variable Width by Angle Example of variable width by time, preset position ALGSCALAR’ALG1’,’Width2’,.010 Stepping mode values Stepper Motor Control Use the command Sensfuncvolt @100 Full Step Mode, Full and Half Speed, 4-Channel Page RST and *TST important Command Syntax For newer Units only Scpi Command Reference Command Syntax For newer Units only Discussed INPutPOLarity? INPutPOLarityParameters Comments INPutTHResholdLEVel Level can be set to a resolutionINPutTHResholdLEVel? OUTPutPOLarity? OUTPutPOLaritySend with VXIplug&play Function hpe14XXcmdReal64Q SENSeFREQuencyAPERture SENSeFREQuencyAPERture? Related Commands SensfreqaperSENSeFREQuencyLIMitLOWer Init SENSeFREQuencyLIMitLOWer? Related Commands INPutPOLaritySENSeFUNCtionCONDition SENSeFUNCtionPERiod SENSeFUNCtionFREQuency SENSeFUNCtionQUADrature SENSeFUNCtionPWIDth SENSeFUNCtionRVELocity RPS SENSeFUNCtionTOTalize SENSePERiodAPERture SENSePERiodLIMitUPPer SENSePERiodAPERture? Init SENSePERiodMODE SENSePERiodLIMitUPPer? SENSePERiodMODE? Related Commands SENSePERiodMODESENSePERiodNPERiods SENSePERiodRANGeUPPer SENSePERiodNPERiods?Send with VXIplug&play Function hpe14XXcmdInt32Q SENSePERiodRANGeUPPer? SENSeTOTalizeRESetMODERST Condition is Send with VXIplug&play Function hpe14XXcmd SOURceFMSTATe SENSeTOTalizeRESetMODE? Send with VXIplug&play Function hpe14XXcmdInt16Q SOURceFMSTATe? SOURceFUNCtionRPULse SOURceFUNCtionSHAPePULSe SOURceFUNCtionSHAPeCONDition SOURceFUNCtionSTEPper SOURceFUNCtionSHAPeSQUareComments Send with VXIplug&play Function hpe14XXcmd Relationship of minvel, and maxvel Usage See Stepper Motor Control on SOURcePULMSTATe SOURcePULSePERiod SOURcePULMSTATe? SOURcePULSeWIDTh SOURcePULSePERiod? SOURceRPULsePOSitionANGLe SOURcePULSeWIDTh?33,554,430 to 33,554,430 SOURRPULseVARType SOURceRPULsePOSitionANGLe?Usage SOURceRPULseWIDThANGLe SOURRPULseVARType? SOURceRPULseWIDThTIME SOURceRPULseWIDThANGLe?00000787 to SOURceRPULseWIDThTIME? General Specifications Specifications Frequency Measurement Pulse Width Measure Rotational Pulse Source