Resistive Sensor Simulation

The Resistive Sensor Simulation (RSS) subsystem is designed to simulate resistive sensors such as PT100, PT500, NTC or potentiometers. The ADS2 or PC host system can directly control the resistor value. Additional settings will enable the use of different scales such as temperature or pressure scales. The transformation of the input scale to the actual resistor value is performed by the ADS2 driver and the controller of the RSS system.    

Functional Description

Each physical channel of the RSS is fully galvanically isolated from the other channels, and it is located on a piggy-pack specifically matched to the required application. The following resistive simulator modules (RSM) are currently available: PT100 (RSM-PT100); PT500 (RSM-PT500); PT1000 (RSM-PT1000); NTC (RSM-NTC); Poti 20K (RSM-R20K). Up to ten RSMs are mounted on a 6U VME carrier. The RSM-carrier (RSM-C) provides a serial interface and a VME bus interface as well as analog connectors. For each sensor a specific resistor matrix is used to match the required resistor parameters. The resolution of the matrix is 24 bits uncalibrated (non-linear). To guarantee absolute rating of digitally selected resistance the RSMs are temperature-compensated in the range of 20° C to 50° C. One serial controller can control up to 16 RSM-C for a total of 160 channels. For high speed and/or low channel count applications the RSM-C can be used without the serial controller directly in a VME environment.