NI SCXI-1303 32-CHANNEL ISOTHERMAL TERMINAL BLOCK

NI SCXI-1303 32-CHANNEL ISOTHERMAL  TERMINAL BLOCK

DESCRIPTION

The SCXI-1303, 32-channel isothermal terminal block is a shielded device with screw terminals that connect to the SCXI-1102/B/C and SCXI-1100 modules. The SCXI-1303 has a high-accuracy thermistor cold-junction temperature sensor, and an isothermal copper plane to minimize the temperature gradients across the screw terminals when you take measurements with thermocouples.

Temperature Sensor Output and Accuracy

The SCXI-1303 temperature sensor outputs 1.91 to 0.58 V from 0 to 55 °C and has an accuracy of ±0.5 °C over the 15 to 35 °C range and ±0.9 °C over the 0 to 15 °C and 35 to 55 °C ranges1.

National Instruments software can convert a thermistor voltage to the thermistor temperature for the circuit diagram shown later in this guide. In LabVIEW, you can use the Convert Thermistor Reading VI in the Data Acquisition»Signal Conditioning palette. If you are using LabWindows/CVI or NI-DAQ, use the Thermistor_Convert function. The VI takes the output voltage of the temperature sensor, the reference voltage, and the precision resistance and returns the thermistor temperature.

Technical features

32 channels of differential inputs:

The SCXI-1303 provides 32 differential input channels, each of which is temperature compensated by an isothermal copper layer to minimise the effect of temperature gradients on measurement results.

Isothermal Copper Layer:

The isothermal copper layer design inside the terminal block effectively reduces the temperature gradient on the screw terminals, thus improving the accuracy of the measurement.

Thermistor Cold End Temperature Sensor:

Equipped with an accurate thermistor cold end temperature sensor to compensate for cold end temperature variations in thermocouple measurements, further improving measurement accuracy.

78 screw terminals:

78 screw terminals are provided for easy connection and disconnection of signals. Of these, 32 pairs of screw terminals connect to the 32 differential inputs of the SCXI module, one pair of terminals connects to the chassis ground pin on the module, and three terminals connect to the SCXI module OUTPUT and AOREF pins and the SCXIbus GUARD.

Open Thermocouple Detection:

The terminal has an open thermocouple detection function, which can help users find and deal with open thermocouples in time to ensure the accuracy of the measurement.

Signal Ground Reference:

The signal ground reference function is provided, enabling users to easily connect the signal to ground, improving the stability and reliability of the measurement.

Strong compatibility:

The SCXI-1303 terminal block is highly compatible with NI's SCXI-1100/1102/1102B/1102C modules and can be easily integrated into existing SCXI systems.

Application Areas

SCXI-1303 terminal block is widely used in a variety of applications that require high-precision thermocouple temperature measurement, such as laboratory testing, industrial automation control systems, environmental monitoring and other fields. It can provide accurate and reliable measurement results to meet the user's needs for high-precision temperature measurement.

Installation and Maintenance

Installation:

When installing the SCXI-1303 terminal block, users need to follow the installation guide or manual provided by NI to ensure that the terminal block is correctly installed on the SCXI chassis or module. Also, care needs to be taken to keep the terminal clean and dry to avoid contaminants such as dust and moisture from entering the inside of the terminal.

Maintenance:

Periodically check the connection status and tightness of the terminals to ensure that each terminal is securely connected to the corresponding device. If the terminals are found to be loose or damaged, etc., they need to be replaced or repaired in a timely manner. In addition, attention needs to be paid to regular cleaning and maintenance of the terminals to extend their service life.