SCXI-1322

Description

The National Instruments SCXI-1322 Temperature Sensor Terminal Block, with a part number of 777687-22, is specifically compatible with the SCXI-1122 module. It is designed to be mounted directly to the front of the SCXI module, facilitating easy installation and integration into existing systems.

This terminal block is equipped with an onboard sensor that provides cold junction compensation, which is crucial for accurate temperature measurements. It features a total of 48 screw terminals, with sixteen pairs dedicated to linking with the SCXI-1122 module’s inputs, and an additional seven pairs for module excitation channels.

In terms of connectivity, the terminal block includes two critical terminals: VEX/SENSE+ and VEX/SENSE-. By default, resistors R3 and R4 are loaded, allowing these terminals to function as VEX+ and VEX- respectively. However, for applications requiring remote sensing—such as to compensate for voltage drops across long excitation leads—users have the option to remove these resistors, thereby transforming the VEX/SENSE terminals into remote sensing points.

The SCXI-1322 is also capable of providing a single voltage excitation channel, courtesy of the SCXI-1122 module, which supports precise electrical measurements. Despite its announcement of obsolete status by National Instruments, the SCXI-1322 Temperature Sensor Terminal Block remains available for purchase and repair through Apex Waves, ensuring that users can continue to rely on this essential component for their measurement needs.

Question 1: How can users utilize the VEX/SENSE+ and VEX/SENSE- terminals on the National Instruments SCXI-1322 Temperature Sensor Terminal Block for applications that require remote sensing?
Answer 1: Users can utilize the VEX/SENSE+ and VEX/SENSE- terminals on the National Instruments SCXI-1322 Temperature Sensor Terminal Block for applications requiring remote sensing by removing resistors R3 and R4, which allows these terminals to function as remote sensing points to compensate for voltage drops across long excitation leads.

Question 2: What features make the National Instruments SCXI-1322 Temperature Sensor Terminal Block, part number 777687-22, an important component for accurate temperature measurements when used with the SCXI-1122 module?
Answer 2: The National Instruments SCXI-1322 Temperature Sensor Terminal Block, part number 777687-22, is an important component for accurate temperature measurements when used with the SCXI-1122 module due to its onboard sensor that offers cold junction compensation, its 48 screw terminals that ensure secure connections, and the option for remote sensing via the VEX/SENSE+ and VEX/SENSE- terminals, which can be converted to function as remote sensing points by removing resistors R3 and

Question 3: What functions do resistors R3 and R4 serve in the National Instruments SCXI-1322 Temperature Sensor Terminal Block, and how can users utilize the VEX/SENSE+ and VEX/SENSE- terminals for remote sensing applications?
Answer 3: The onboard sensor of the SCXI-1322 Temperature Sensor Terminal Block provides cold junction compensation, which is essential for accurate temperature measurements, while its VEX/SENSE+ and VEX/SENSE- terminals are used for voltage excitation; they can function as VEX+ and VEX- by default or can be transformed into remote sensing points by removing resistors R3 and R4 to compensate for voltage drops across long excitation leads.

Question 4: What is the purpose of removing resistors R3 and R4 from the National Instruments SCXI-1322 Temperature Sensor Terminal Block’s VEX/SENSE+ and VEX/SENSE- terminals?
Answer 4: In the National Instruments SCXI-1322 Temperature Sensor Terminal Block, resistors R3 and R4 are loaded by default to allow the terminals to function as VEX+ and VEX- for voltage excitation; however, for remote sensing applications, users can remove these resistors to enable the VEX/SENSE+ and VEX/SENSE- terminals to compensate for voltage drops across long excitation leads.

Question 5: How does the SCXI-1322 Temperature Sensor Terminal Block’s onboard sensor contribute to temperature measurement accuracy, and what are the function of its VEX/SENSE+ and VEX/SENSE- terminals?
Answer 5: The purpose of removing resistors R3 and R4 from the National Instruments SCXI-1322 Temperature Sensor Terminal Block’s VEX/SENSE+ and VEX/SENSE- terminals is to enable the use of these terminals for remote sensing, which allows for compensation of voltage drops across long excitation leads to ensure more accurate electrical measurements.