Product Introduction

The NI SCXI-1377 is a fully shielded wiring terminal board specifically designed for the SCXI-1130 multiplexer module. The device features a screw wiring structure and is equipped with a cable stress release device, enabling stable connection of various low-level signals such as voltage, thermocouples, and resistors. An onboard cold junction compensation sensor is available, meeting the requirements for high-precision temperature measurement. The metal shielding shell effectively resists electromagnetic interference and is suitable for high-channel-count and high-precision signal acquisition scenarios.

Model Interpretation

SCXI is an instrument signal conditioning expansion platform, a modular signal conditioning hardware system introduced by NI. The 13xx series uniformly refers to the front-end wiring terminal boards and functional accessories配套 to the SCXI system. SCXI-1377 is an exclusive wiring terminal board， specifically compatible with the SCXI-1130 multiplexer module. Technical Specifications

Electrical parameters

This product is only compatible with the SCXI-1130 multiplexer module. It supports three mainstream wiring modes: single wire, dual wire, and quad wire. It can correspondingly achieve 256 single-wire, 128 dual-wire, and 64 quad-wire signal acquisition. The equipment supports the connection of voltage, thermocouple, and resistance type low-level signals. The maximum tolerable DC voltage at the signal end and common mode end is positive and negative 60 volts. The onboard integrated cold end compensation sensor provides temperature compensation specifically for thermocouple temperature measurement. The overall design adopts full metal shielding, which can suppress electromagnetic radiation and radio frequency interference. The cable specifications are compatible with conventional industrial wiring requirements.

Mechanical and environmental parameters

The product follows the SCXI standard structure specification and adopts the front-end installation method. It is fixed by tightening screws. The working temperature range is 0 degrees Celsius to 50 degrees Celsius, and the storage temperature range is -20 degrees Celsius to 70 degrees Celsius. The relative humidity range of the working environment is 10% to 90%. During operation, the environment must not have condensation. The terminal part is equipped with a cable fixation structure to reduce the impact of cable tension and vibration.

Interface and communication configuration

The front of the equipment is arranged with complete screw terminal blocks, which are partitioned according to channel rules. At the same time, relevant connection points for cold end compensation are integrated. The back adopts a dedicated interface for direct physical connection with the SCXI-1130 module and signal transmission, without the need for additional transfer lines. The equipment itself has no independent communication circuit or hardware jumpers, belonging to pure passive wiring accessories. The system is compatible with the NI-DAQmx driver program and can be used normally in mainstream development environments such as LabVIEW, C/C++, and LabWindows/CVI.

Core functions

It precisely matches the channel architecture of the SCXI-1130 module, flexibly supports single-wire, dual-wire, and quad-wire wiring methods, and adapts to different types of signal measurement requirements. The screw terminals are combined with a cable stress release structure, ensuring secure connection, resistance to vibration, and prevention of loosening, suitable for long-term operation in the field. The built-in cold end compensation sensor simplifies the configuration of the thermocouple temperature measurement system and ensures the accuracy of temperature measurement. The full metal shielding shell significantly reduces external electromagnetic interference and improves the stability and accuracy of low-level signal acquisition. It has high integration, simple installation and wiring, and can quickly build a large-scale multi-channel signal acquisition system. Applicable scenarios

The main configuration involves using the SCXI-1130 module to build a high-channel-count temperature acquisition system, enabling the measurement of multiple thermocouple and thermoresistance signals. It is suitable for low-level voltage signal acquisition in complex electromagnetic environments such as industrial sites and laboratories. It can be applied to automated production lines and equipment monitoring platforms to achieve multiplexing and centralized collection of sensor signals at multiple points. It can also be used in various testing systems to complete the inspection and measurement of large-scale resistance signals.

Operation and Maintenance Instructions Instruction Manual

Before conducting installation and wiring, the power supply of the entire equipment must be cut off. Align the terminal board with the front interface of the SCXI-1130 module and push it in smoothly. Tighten the fixing screws to ensure a reliable connection. Connect the external signal cables according to the terminal markings, and use the cable fixing structure to organize the wires to avoid external force pulling. When conducting thermocouple measurements, confirm that the cold junction compensation function is enabled properly. According to the actual measurement requirements, select the corresponding single-line, double-line or four-line working mode in the software, and after configuration, data collection can be carried out. This terminal board is only compatible with the SCXI-1130 module and cannot be used with other models of hardware.

Maintenance Instructions

The equipment should be placed in a dry and ventilated environment, maintaining the temperature and humidity within the rated range, and keeping away from strong electromagnetic interference sources, dust and corrosive gases. Regularly check if the wiring screws are loose, if the terminal surface is oxidized, and if the cable outer skin is damaged. If any problems are found, they should be repaired in time. Cleaning operations must be carried out under power-off conditions. Use a dust-free soft cloth to wipe the equipment surface and terminal connections, and do not use liquid cleaners to directly contact the components. When the equipment is idle for a long time, remove all external cables and properly store the terminal board in a cool and dry place.