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The National Instruments SCXI-1104C is a high-precision *32-Channel Analog Input Module* designed for the SCXI (Signal Conditioning eXtensions for Instrumentation) platform, providing robust signal conditioning for voltage, current, and thermocouple measurements in demanding test, measurement, and industrial automation applications. Engineered to amplify, filter, and multiplex low-level signals, the SCXI-1104C interfaces with NI DAQ devices (e.g., PCI/PXI boards) to deliver laboratory-grade accuracy in harsh environments. This module features four independent instrumentation amplifiers with programmable gains (1–2000 V/V), 4 Hz low-pass filtering, and channel-to-channel isolation, eliminating ground loops and suppressing noise in electrically noisy settings like motor test benches or factory floors.
With its 32 single-ended or 16 differential inputs, the SCXI-1104C supports thermocouple measurements (J/K/T/E/R/S/N/B types) using built-in cold-junction compensation (CJC) sensors, alongside ±60V overvoltage protection to safeguard against accidental wiring faults. Compatible with SCXI-1000/1001 chassis, this module enables scalable multi-channel systems with synchronized sampling across multiple modules. The SCXI-1104C is ideal for stress-testing rigs, environmental chambers, and process monitoring where reliable data acquisition is critical, offering 24-bit resolution and 0.01% gain accuracy for uncompromised signal integrity from -40°C to +70°C operating temperatures.
NI SCXI-1104C
Technical Specifications
| Parameter Name | Parameter Value |
| Product Model | SCXI-1104C |
| Manufacturer | National Instruments (NI) |
| Product Type | Analog Input Signal Conditioning Module |
| Channels | 32 single-ended / 16 differential |
| Input Types | Voltage (±60V max), Current (0-20mA), Thermocouple (J/K/T/E/R/S/N/B) |
| Amplifier Gains | Programmable: 1, 2, 5, 10, 20, 50, 100, 200, 500, 1000, 2000 V/V |
| Filtering | 4 Hz low-pass Bessel filter |
| ADC Resolution | 24-bit (via external DAQ device) |
| Accuracy | ±0.01% gain error, ±3 µV offset error |
| Isolation | Channel-to-channel: 250V AC |
| Cold-Junction Compensation | ±1°C accuracy (integrated sensors) |
| Overvoltage Protection | ±60V continuous |
| Operating Temperature | -40°C to +70°C |
| Power Requirements | +5V DC (via SCXI backplane) |
| Connector | 96-pin front connector |
| Dimensions | 215.9 mm x 87.9 mm x 40.6 mm (W x H x D) |
| Compatibility | SCXI-1000/1001 chassis, NI DAQmx drivers |
Main Features and Advantages
Precision Signal Conditioning: Four independent instrumentation amplifiers deliver programmable gains up to 2000 V/V with 0.01% gain stability, enabling precise measurement of microvolt-level signals from strain gauges or thermocouples. Integrated 4 Hz Bessel filters suppress aliasing and high-frequency noise without phase distortion.
Versatile Sensor Support: Direct thermocouple interfacing with automatic cold-junction compensation (±1°C accuracy) eliminates external CJC modules. Current inputs accept 0-20mA signals via internal shunt resistors. The SCXI-1104C’s ±60V overvoltage protection withstands industrial voltage transients.
High-Density Channel Expansion: 32-channel architecture reduces per-channel costs in large-scale systems. Synchronization with other SCXI modules via analog triggers enables multi-rack configurations for thousands of channels.
Industrial Durability: Operates reliably in -40°C to +70°C environments with 30g shock resistance. Channel-to-channel isolation prevents ground loops in multi-sensor setups near VFDs or welding equipment.
Application Field
The SCXI-1104C excels in precision measurement scenarios:
Automotive Testing: Synchronizes thermocouple data from engine dynos and exhaust systems during endurance trials.
Aerospace: Monitors wing deformation via strain gauges in environmental stress screening chambers.
Energy: Acquires temperature profiles from battery packs in EV validation tests.
Manufacturing: Measures current draw of robotic arms for predictive maintenance.
Research: Logs cryogenic temperatures in superconducting magnet experiments.
Process Control: Tracks kiln thermal zones in ceramic production with Type K thermocouples.
Related Products
SCXI-1000: 4-slot USB chassis for SCXI-1104C integration.
SCXI-1303: Terminal block for voltage/thermocouple wiring.
SCXI-1126: Strain gauge module for bridge sensor measurements.
PCI-6221: 16-bit DAQ card for digitizing SCXI-1104C outputs.
SCXI-1102: 32-channel universal analog input with higher-speed sampling.
TBX-68T: Thermocouple terminal block for direct sensor connection.
NI DAQmx: Software for configuring the SCXI-1104C and DAQ devices.
NI SCXI-1104C
Installation and Maintenance
Pre-installation preparation: Verify SCXI chassis compatibility and slot availability. Install NI DAQmx drivers and NI MAX configuration software. Calibrate thermocouple compensation via software before sensor connection. Ensure proper grounding of the SCXI chassis to minimize noise for the SCXI-1104C.
Maintenance recommendations: Clean front-panel connectors annually with electronic contact cleaner. Verify calibration annually using precision voltage/current source. Update firmware through NI MAX. Replace cooling fans in chassis every 3 years. Avoid exposing the SCXI-1104C to conductive dust or condensation.
