VXI VT1538A user manual Introduction

Introduction

The Agilent E1538A provides eight TTL compatible channels of digital I/O. Channels can be individually configured to perform any one of the following functions:

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Input:

--Static digital state

--Frequency measurement

--Period meaurement

--Totalize positive or negative signal transitions

--Pulse width measurement

--Rotational velocity (senses added or missing cogwheel teeth)

--Quadrature position. (requires 2 channels)

Output (configurable as Open Drain or passive pull-up):

--Static digital state

--Single pulse-per-trigger: Generates a pulse at each algorithm execution. The pulse width is controlled by the algorithm.

--Pulse Width Modulation: A free-running pulse train where a SCPI command pre-configures the frequency and the algorithm controls the pulse width.

--Frequency Modulation: A free-running pulse train where a SCPI command pre-configures the pulse width and the algorithm controls the frequency. In this FM mode the duty cycle varies with frequency.

--Frequency Modulation: A free-running pulse train where the duty cycle remains constant at 50% while the algorithm controls the frequency.

--Rotationally positioned pulse: The algorithm controls the angular pulse position (relative to an input sensing rotational velocity). The pulse width is fixed by a SCPI command. (requires a reference channel in addition to any rotational pulse output channels)

--Rotationally positioned pulse: The algorithm controls the width of the pulse. The angular pulse position (relative to an input sensing rotational velocity) is fixed by a SCPI command.(requires a reference channel)

--Stepper Motor Control: Controls 2-phase and 4-phase motors in

4 Agilent E1538A Enhanced Frequency/Totalize/PWM SCP