Description

The NI SCXI-1303 is a high performance terminal from National Instruments (NI) that is particularly recommended for high precision thermocouple temperature measurement applications. The following is a detailed analysis of NI SCXI-1303:

I. Product overview
NI SCXI-1303 (Part number :777687-03) is a 32-channel terminal designed for use with SCXI modules such as SCXI-1100/110102/1102B /1102C. It integrates many advanced features, such as thermocouple open circuit detection, signal ground reference and isothermal functions, designed to provide accurate and reliable temperature measurement solutions.

2. Main features and functions
High precision thermocouple temperature measurement:
The NI SCXI-1303 is equipped with an extremely accurate thermistor cold end temperature sensor, which reduces the temperature gradient on the screw terminal when the user makes thermocouple measurements, thereby increasing the measurement accuracy.
Isothermal copper layer:
The terminal contains an isothermal copper layer that helps maintain uniform temperature during thermocouple measurements and reduces errors due to temperature gradients.
Special Features:
Thermocouple open circuit detection: can detect whether the thermocouple is open circuit, help users find and solve problems in time.
Signal grounding reference: Provides a stable grounding reference to ensure the accuracy of signal measurement.
Isothermal function: Through isothermal design, improve the stability and reliability of temperature measurement.
Rich screw terminals:
The terminal has 78 screw terminals, of which 32 pairs of screw terminals are connected to the 32 differential inputs of the SCXI module, ensuring flexibility and reliability of signal connections.
Bias resistance:
The NI SCXI-1303 has a pull-up and bias resistance that saturates the open channel by applying a +5V voltage to the input of the open channel, helping the user sense the open thermocouple. The device can be used with 10Ω and 10MΩ bias resistors, and users can easily replace the bias resistors as needed.
Thermistor cold end sensor:
The sensor has an accuracy of 0.5°C at 15 to 35°C, 0.9°C at 0 to 15°C and higher at 35 to 55°C (exact values are not detailed, but accuracy is known to decline at 35 to 55°C). In addition, it has an output voltage of 1.91 to 0.58V in the range of 0 to 55°C.
3. Application fields
NI SCXI-1303 is widely used in applications requiring high precision temperature measurement, such as industrial automation, laboratory testing, scientific research experiments and other fields. It is especially suitable for applications that require high temperature measurement accuracy, such as precision instrument calibration, temperature control systems, etc.

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