Model: SCXI-1127
Features:
A configuration determined by the terminal
Easy matrix expansion
Easy instrument synchronization with hardware triggers
List of 512-step scans for deterministic scanning
The National Instruments SCXI-1127 is a 32-channel (2-wire) high-density armature electromechanical relay module that can be used as a multiplexer or matrix module. As a multiplexer, the module can operate in different modes, including 1-wire for large channel number systems, 2-wire for differential pair systems, or 3-wire and 4-wire modes for resistance measurements, including RTDS and thermistors. The SCXI-1127 is designed to handle low and high voltage signals.
The SCXI-1127 is converted into a 64×1-wire matrix, a 32×2-wire matrix, a 4×82 wire matrix, or a 16×4-wire matrix through the preterminal. Use one or more of these modules to extend the measuring capabilities of a digital multimeter (DMM), or you can build a complete ATE switching system for all your instruments.

The 1127 runs with NI-SWITCH driver software that supports application development environments (ades) such as LabVIEW, Measurement Studio, Visual Basic, Microsoft C, and C++. You can configure this device using the Measurement & Automation Explorer tool.
NI SCXI-1127 has a multi-function scanning structure. Users can scan any channel and have multiple input modes in a single scan, which helps connect multiple sensor types to a single module. SCXI-1127 has two scanning methods: software scanning and hardware timing scanning. Software scanning allows channels to be selected by software. This procedure does not require a trigger connection. In addition, software scanning does not provide the time accuracy of hardware timing scanning. Hardware timing scanning enables measuring devices, such as digital multimeters, to communicate with the NI SCXI-1127 via digital trigger signals. There are also two types of hardware timing scans: synchronous scanning and handshake scanning. A synchronous scan requires only a single signal from the device to the multiplexer, but a handshake requires another signal from the multiplexer to be linked to the device. The SCXI-1127 weighs 1 pound and measures 1.2 x 6.8 x 7.8 inches.