Overview

The 40-262 is an 18 channel variable resistor module designed to simulate the operation of PT100 and PT1000 RTD’s with unprecedented resolution and accuracy in the PXI form factor. The 40-262 provides a resistance setting resolution of better than 10 mΩ over the entire resistance range and an accuracy of better than 0.1% for all resistance settings, allowing RTD’s to be simulated with great accuracy.

The 40-262 uses an innovative (patented) design principal that combines fine and coarse control mechanisms in combination with a calibration system to achieve its excellent performance. The requested resistance value is simply provided by the use of resistance calls (in ohms) to the module instead of the alternative approaches which are based on setting patterns of relay settings. According to David Owen, Business Development Manager for Pickering Interfaces, “This approach saves users considerable effort in simulating variable resistance devices, users can simply implement an interface to the simulator based on the known resistance versus temperature curve for the their chosen sensor. The 40-262 achieves this with an accuracy that is at least an order of magnitude more accurate than that achievable by other approaches used in PXI modules”.

The excellent accuracy of the 40-262 is easily supported when deployed in a system. The module includes a calibration port that can be used to calibrate the resistor channels while the unit is connected to the UUT in a test system using an external DMM.

Other versions of the 40-262 RTD simulator can be supplied suitable for simulating other types of sensors. For more information contact your local Pickering Interfaces’ sales representative.