Description
The NI TBX-1303 Isothermal Terminal Block, with the part number 777207-03, falls under the category of SCXI & Legacy products. This model is specifically designed to enhance the functionality and reliability of various SCXI modules such as the SCXI-1100, SCXI-1181, SCXI-1102, and SCXI-1102B/C when they are used with thermocouples.
The TBX-1303 is DIN rail-mountable, allowing for easy and secure installation in various settings. One of the notable special features of this terminal block is its automatically ground-referencing capability, alongside the ability to detect open-thermocouple loops. Its isothermal construction ensures minimal temperature gradient across the block, enhancing measurement accuracy.
It boasts 108 terminals, including a shield, CH+, and CH- for every input channel, providing ample connectivity for multiple thermocouple connections. The terminal block utilizes a thermistor temperature sensor for cold-junction compensation, which is crucial for maintaining accurate temperature measurements.
The TBX-1303 supports two operating modes: Multiplexed temperature sensor mode and Direct temperature sensor mode. This versatility allows users to choose the most appropriate mode based on their specific application needs. The temperature sensor voltage output range is from 1.91 to 0.58 V, with a maximum voltage output accuracy of ±0.65 °C within the temperature range of 15 to 35 °C.
For open thermocouple detection, the terminal block employs a pull-up resistor between +5 V and CH+, and a bias resistor between chassis ground and CH–. This feature ensures the reliability of temperature measurements by alerting the system to any open circuits.
Although declared obsolete by National Instruments, the TBX-1303 remains available for purchase and repairs through Apex Waves, providing users with continued access to this essential component for their SCXI systems.
| Specification | Detail |
|---|---|
| Part Number | 777207-03 |
| Category | SCXI & Legacy |
| Model | TBX-1303 |
| Description | NI TBX-1303 Isothermal Terminal Block |
| Compatibility | SCXI-1100, SCXI-1181, SCXI-1102, SCXI-1102B/C with thermocouples |
| Mounting Type | DIN rail-mountable |
| Special Features | Automatically ground-referencing, open-thermocouple loop detection capability, isothermal construction |
| Terminals | 108 terminals (shield, CH+, CH- for every input channel) |
| Cold-Junction Compensation | Thermistor temperature sensor |
| Operating Mode | Multiplexed temperature sensor mode, Direct temperature sensor mode |
| Temperature Sensor Voltage Output Range | 1.91 to 0.58 V |
| Maximum Voltage Output Accuracy | ±0.65 °C (within 15 to 35 °C) |
| Open Thermocouple Detection | Pull-up resistor between +5 V and CH+, Bias resistor between chassis ground and CH– |
| Obsolete Status | Declared by National Instruments, available for purchase and repairs by Apex Waves |
Question 1: What is the part number for TBX-1303?
Answer 1: 777207-03
Question 2: Can TBX-1303 detect open thermocouple loops?
Answer 2: Yes, it has open thermocouple detection.
Question 3: Is TBX-1303 DIN rail-mountable?
Answer 3: Yes, it’s designed for DIN rail mounting.
Question 4: How many terminals does the TBX-1303 have?
Answer 4: 108 terminals, including shield, CH+, and CH-.
Question 5: What SCXI modules is TBX-1303 compatible with?
Answer 5: SCXI-1100, 1181, 1102, and 1102B/C.
