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National Instruments 776572-27 Matrix/Multiplexer Switch Module for SCXI

The National Instruments 776572-27, also known as the SCXI-1127, is an armature relay module with a high voltage. This adaptable module is perfect for a range of high-density switching applications because it may be used as a matrix switch as well as a multiplexer. The 776572-27 performs exceptionally well in a variety of operational modes, including 1-wire for differential pair systems and large-channel counts, 2-wire for resistive measurement systems, and 3- and 4-wire modes for accurate resistive measurements needed for thermistors and resistance temperature detectors (RTDs).

The 776572-27 can be configured as a 64x1 1-wire multiplexer, 32x1 2-wire multiplexer, 16x1 4-wire multiplexer, or 4x8 2-wire matrix with the SCXI front-mounting terminal blocks. Because of its adaptability, it's a valuable component of many different testing and measurement setups. A single module can satisfy numerous multiplexing demands since the 776572-27 module can also function as two 1x16 or four 1x8 2-wire multiplexers in independent mode.

With software-configurable switches, the 776572-27 becomes even more versatile. It can be used as a 1x64 4-wire multiplexer for resistive measures or as a 1-wire 1x64 multiplexer for multiple common-referenced measurements. The module can also be configured as a 4x8 or 1x32 2-wire matrix using specific terminal blocks. By connecting additional 776572-27 modules via the high-voltage analog bus (HVAB) backplane adapter included in the SCXI-1357/1358 kit, the system's capacity to handle high channel counts is further increased. By joining two SCXI-1127/1128 modules, this adapter makes it easier to expand the HVAB without requiring intricate wiring, allowing combinations like a 1x64 2-wire multiplexer.

The 776572-27 is designed to function dependably at voltages both high and low. The module's relays have a very low thermal offset to provide good accuracy in low-voltage applications like thermocouple measurements. The 776572-27 can handle signals up to 250 V rms at a 200 mA load and 30 VDC at a 1 A load in high-voltage situations.

Through NI-SWITCH, control of the 776572-27 is easily included into application development environments (ADEs). Easy to use and robust software integration are provided via supported ADEs, which include LabVIEW, Measurement Studio, Visual Basic, and C or C++ environments.