I. Product Introduction

The NI SCXI-1300 is a universal front-end connector board for the SCXI platform, not a data acquisition module. It is specifically designed for 32-channel SCXI modules to provide signal conversion and cold junction compensation. It is compatible with SCXI-1100/1102/B/C/1104/C/1181/1181K and other modules. It features a shielded housing and screw terminals, integrating a cold junction compensation sensor. It is suitable for reliable connections of voltage and thermocouple signals and has been discontinued. Spare parts and technical support are available.

II. Model Interpretation

SCXI: Instrument Signal Conditioning Expansion Series.

1300: Basic model, representing a 32-channel universal connector board with cold junction compensation.

Component Number: 777687-00.

Series Differentiation: 1300 (General 32-channel), 1301 (20-channel), 1302 (50-channel), 1303 (Special for High-Precision Thermocouples).

III. Technical Parameters

Total Number of Terminals: 72 screw terminals.

Signal Channels: 32 pairs of differential input terminals (compatible with 32-channel modules).

Cold Junction Sensor: Built-in temperature sensor, accuracy ±1.3℃ (0～50℃), repeatability ±0.5℃, output 10mV/℃.

Terminal Specifications: Compatible with 26–16 AWG wires, screw fastening type.

Rated Voltage: 300 V AC/DC (terminal to terminal).

Rated Current: 5 A per terminal (continuous).

Insulation Resistance: ≥1 MΩ (500 V DC).

Operating Temperature: 0～55 ℃; Storage - 40～85 ℃.

Humidity: 5%～95% without condensation.

Size: Standard SCXI front panel size, compatible with SCXI chassis.

Weight: Approximately 0.5 kg.

IV. Interface and Communication Configuration

Front Panel: 72 screw terminals, including 32 pairs of differential signals, 2 channels of chassis ground, 1 safety grounding tab, output/reference/grounding terminals.

Back Panel: 96-pin DIN connector, directly connected to the front end of the SCXI module, without independent communication bus.

Installation Method: Front-end embedded installation, no additional tools required.

Shielding: Full metal shielding housing, reducing external electromagnetic interference.

V. Core Functions

32-channel Signal Conversion: Provides differential signal interfaces for 32-channel SCXI modules, compatible with voltage, thermocouple, etc. sensor signals.

Cold Junction Temperature Compensation: Built-in sensor monitors terminal temperature for cold junction compensation in thermocouple measurements, improving measurement accuracy.

Reliable Electrical Connection: Screw terminals are tightened, compatible with multiple specifications of wires, resistant to vibration and loosening in industrial environments.

Shielding Anti-Interference: Full shielding design reduces noise and crosstalk, ensuring the integrity of weak signals (such as mV-level thermocouples).

Grounding and Protection: Independent chassis ground and safety grounding terminals enhance the reliability of system grounding and protect equipment and personnel safety.

VI. Application Scenarios

Multi-channel Voltage Acquisition: 32-channel analog voltage signals (sensors, transmitters) conversion in industrial sites.

Thermocouple Temperature Measurement System: Combined with SCXI-1102 and other modules, realizes 32-channel thermocouple signal connection and cold junction compensation.

General Signal Conditioning: Front-end signal access for SCXI-1100/1104 and other modules, simplifying wiring and maintenance.

Industrial Automation: Production line data acquisition, equipment status monitoring, suitable for harsh electromagnetic environments.

Laboratory Measurement: Multi-channel precise voltage and temperature measurement system, providing stable signal interfaces.

VII. Usage and Maintenance Instructions Instruction Manual

Power-off installation: Align the terminal board with the front end of the SCXI module, push it in smoothly and secure it, ensuring that the 96-pin connector is fully engaged.

Wiring specification: Connect signals according to the terminal labels, with the positive and negative ends of differential signals connected correspondingly; the positive and negative poles of the thermocouple must not be connected in reverse. The wire specification is 26–16 AWG.

Grounding handling: Connect the safety grounding terminal to the system ground, and the chassis ground terminal to the module ground to reduce ground potential difference interference.

Cold end configuration: Enable the cold end compensation function in the software, and select the built-in sensor as the compensation source.

Avoid overloading: The terminal voltage and current must not exceed the rated value to prevent burning of the terminal board or module.

Maintenance instructions

Environment: Maintain ventilation and dryness, with a temperature range of 0 to 55 ℃. Keep away from dust, corrosive gases and strong electromagnetic interference.

Regular inspection: Check monthly for any looseness, oxidation or rust on the screw terminals, and for any damage to the insulation layer of the wires. Tighten or replace promptly.

Cleaning: After power-off, wipe the terminals and the casing with isopropyl alcohol, dry them before powering on; do not allow liquids to enter the connector.

Fault diagnosis: When there is abnormal signal, prioritize checking the wiring, terminal tightness, and the status of the cold end sensor; poor connector contact is mostly due to dust or oxidation.

Long-term storage: After power-off, remove the terminal board, clean the terminals, put them in an anti-static bag, and store in a cool and dry place.