I. Product Introduction

NI SCXI-1320 is a high-voltage general-purpose shielded terminal board, compatible with SCXI-1120/D, 1121, 1125, 1126 high-precision voltage input modules. The core features are high-voltage tolerance (±300VDC/300Vrms) + built-in cold junction compensation sensor, supporting thermocouples, RTD, strain gauges, millivolt/voltage signals. It is fully metal shielded, with screw terminals. It is now obsolete and provides spare parts and maintenance.

II. Model and Part Number

Model: SCXI-1320

Part Number: 777687-15

Location: SCXI-112x series high-voltage/multi-sensor general terminal board

III. Technical Parameters

Electrical Parameters

Channel Configuration:

Compatible with 1120/D, 1125, 1126: 8 differential inputs

Compatible with 1121: 4 differential inputs + 4 excitation outputs

Connectors: 18 screw terminals (8 pairs of signals + 1 pair of chassis ground)

Maximum Working Voltage:

Channel to ground: 300Vrms / ±300VDC

Channel between: 300Vrms / ±300VDC

Cold Junction Compensation (CJC) Sensor:

Type: LM35CAZ integrated circuit

Accuracy: ±1.3℃ (0–50℃)

Sensitivity: 10mV/℃, output 0–0.5VDC (0–50℃)

Input Coupling: DC coupling (no filtering)

Terminal Current: Single channel maximum 5A

Mechanical and Environmental

Size: 173.5×30.3×99.3mm (standard SCXI)

Weight: Approximately 420g

Installation: Directly plug into the 96-pin connector at the front end of SCXI-112x, fixed with thumb screws on top and bottom

Temperature: Working 0–50℃; Storage -20–70℃

Humidity: 10%–90% RH, no condensation

Shielding: Full metal shielded enclosure, resistant to EMI/RFI

IV. Interface and Configuration

Front Panel: 18 screw terminals (signal ±, ground), no jumpers / no switches

Back Panel: 96-pin DIN connector, directly connected to the front end of SCXI-112x module

Configuration: Plug-and-play, CJC sensor automatically works, no software settings required

Software: Compatible with NI-DAQmx, supports LabVIEW, C/C++, LabWindows/CVI

V. Core Functions

Direct connection of high-voltage signals: Tolerant to ±300VDC/300Vrms, can directly connect industrial high-voltage sensors, power supplies, motor voltages, without additional attenuators.

Built-in high-precision CJC: Board-mounted temperature sensor, automatic cold junction compensation when measuring thermocouples, accuracy ±1.3℃, saves external compensation circuits.

Multi-sensor compatibility: Compatible with thermocouples (J/K/T/E/R/S/B), RTD (platinum resistance), strain gauges, millivolt sources, voltage sources, with strong universality.

Full shielding anti-interference: Metal enclosure isolates industrial EMI/RFI, ensuring stable measurement in high-voltage environments.

VI. Application Scenarios

Industrial high-voltage measurement: 300V DC/AC voltage acquisition (power supplies, frequency converters, motors).

High-precision thermocouple temperature measurement: J/K/T type thermocouples, built-in CJC, no additional compensation required.

SCXI-112x companion: Combined with 1120/D (8 channels), 1121 (4 channels + excitation), 1125/1126 (8 channels).

Multi-sensor mixed acquisition: Same terminal board can be connected with thermocouples, RTD, strain gauges, voltage signals.

VII. Use and Maintenance Use

Power-off installation: Align 112x front end and push in, then lock the upper and lower thumb screws.

Wiring: Signal + connects to channel +, signal - connects to channel -. Shield / earth connects to chassis ground terminal.

Software: Select module in NI-DAQmx, set voltage range (such as ±10V, ±100V), and directly enable CJC for thermocouples. Maintenance

Environment: 0 - 50℃, dry and ventilated, away from strong electromagnetic interference.

Check: Regularly inspect for loose screws and oxidation of terminals. Tighten and clean.

Cleaning: Disconnect power, wipe terminals with anhydrous alcohol, dry and then reconnect power.

Storage: Disconnect power, remove the board, seal with an anti-static bag, store in a cool and dry place.