PXIE-2727
The PXIe-2727 is a high-range programmable resistor module built on the PXI Express platform. It features 18 independent channels and adopts reed relay arrays to deliver adjustable resistance. Each channel offers a wide resistance range from 256 ohms to 65535 ohms with fine step adjustment. This module is designed to simulate high-value resistive devices, resistive sensors and divider circuits. It is widely used in hardware-in-the-loop simulation, industrial sensor emulation and electronic circuit testing for automotive, aerospace and general industrial applications.
Description
Model Nomenclature
PXIe stands for the PXI Express high-speed modular instrumentation bus. The number 27 represents the product line of programmable resistor and simulation modules. 2727 refers to an 18-channel programmable resistor module with high resistance range, designed for simulating high-impedance resistive components.
Technical Specifications
This is a standard 3U single-slot module compatible with PXIe hybrid and peripheral slots. It has 18 fully independent resistance channels. The resistance range of each channel is 256 ohms to 65535 ohms. The module uses multi-stage relay networks to achieve precise resistance setting and maintains stable accuracy across the full range. It is equipped with gold-plated contact reed relays.
The maximum working voltage reaches 60 VDC or 30 VAC RMS, and the maximum operating current per channel is 300 milliamps. The maximum power dissipation for a single resistive load is 5 watts. The typical relay actuation time is 1 millisecond and the maximum value is 3 milliseconds. The relay mechanical lifespan exceeds one million operations under rated conditions. A dedicated DMM port is reserved for on-site resistance verification and calibration.
The operating temperature ranges from 0 degrees Celsius to 55 degrees Celsius, and the storage temperature ranges from -20 degrees Celsius to 70 degrees Celsius. The module draws 1.2 watts from the 3.3 V power rail and a maximum of 11 watts from the 12 V power rail.
Interface and Communication Configuration
The front panel is fitted with a 50-pin D-sub connector for all signal channels and common terminals, plus one SMB port dedicated to digital multimeter connection. The module applies the PXIe Gen1 bus and supports plug-and-play on Windows operating systems. It uses PXI trigger lines to implement synchronous resistance adjustment across multiple modules. Users can complete hardware configuration, parameter setting and device diagnosis via NI-MAX. Programming and secondary development are available with LabVIEW, LabWindows/CVI and C++ interfaces together with the supporting driver.
Core Features
Eighteen independent channels support parallel simulation of multiple high-resistance sensors and loads in one compact slot. The wide resistance coverage meets the test requirements of high-impedance circuits and sensors. The module shares the same voltage, current and power ratings as mainstream programmable resistor modules, matching common signal levels in industrial and automotive electronic systems.
The reserved DMM port simplifies regular calibration and functional verification work. It supports multiple working modes to simulate high-value potentiometers, resistive sensors and voltage divider circuits without hardware modification. Hardware triggering ensures synchronous resistance switching, which satisfies the timing control demands of automated test systems and hardware-in-the-loop platforms.
Application Scenarios
It performs hardware-in-the-loop testing for automotive electronic control units by simulating high-impedance temperature sensors and position sensors. It emulates various high-value resistive sensors for avionics and defense electronic equipment verification. It is applied to functional testing of industrial control modules and PLC analog input units.
The module builds high-resistance voltage divider circuits for instrument calibration and circuit performance evaluation. It also serves for characteristic testing of high-impedance electronic assemblies and passive components in general electronic test systems.
Usage and Maintenance Instructions
Installation and Configuration
Insert the module into a 3U single-slot PXIe chassis and lock the front panel latch. Connect signal cables to the 50-pin D-sub connector. When calibration or measurement verification is needed, connect a digital multimeter to the SMB port. Power on the chassis, and the system will automatically recognize the hardware.
Launch NI-MAX to set the target resistance value for each channel and configure trigger parameters. Develop automated test programs with corresponding programming tools to realize continuous resistance adjustment and synchronous testing procedures.
Daily Maintenance
Place the module and chassis in a clean, dry and well-ventilated environment within the specified temperature range. Do not apply excessive force when connecting or disconnecting D-sub and SMB connectors to avoid contact damage. Inspect cables and connectors regularly for aging, dirt and poor contact. Guarantee sufficient heat dissipation during long-term continuous operation. When not in use, cut off the power, detach all cables and store the module in a dry electrostatic protective environment.
Safety Notice
Never apply voltage, current or power beyond the rated values to prevent permanent damage to internal relays and circuits. Follow standard electrostatic protection rules when handling the module. Disconnect all power supplies of the chassis before installing, removing or maintaining the module. After the service life expires, dispose of the module in compliance with local electronic waste management regulations.
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