CDS VX4286 32-Channel Analog/Digital Input Module

The Tektronix / CDS VX4286 32-Channel Analog/Digital Input Module is a single width, C-Size printed circuit board assembly for use in a C-size or larger mainframe conforming to the VXIbus specification. The thirty-two inputs of the VX4286 Module can be configured under program control to function either as thirty-two digital inputs (Digital mode), as thirty-two comparator inputs with time-tagging (Analog mode), or as sixteen channels of each (combination Analog/Digital mode).

In either mode, all input channels have individually programmable threshold voltages and can be programmed to active high or active low logic. Two logic threshold ranges are provided: ±10V with an accuracy of 40mV and resolution of 5mV, or ±50 V with an accuracy of 100mV and resolution of 25mV. Each channel may be programmed to use either range or it may be instructed to autorange, selecting the most sensitive range suitable for a specified threshold voltage. The VX4286 also includes facilities for input signal conditioning modules, such as pullups for open collector outputs, A/C detection, or user-designed input circuitry.

The front panel display shows which channel, if any, is on the "wrong" side of its threshold.