The NI SCXI-1104 is a 32-channel differential analog input module engineered for medium-voltage signal conditioning within National Instruments’ SCXI chassis ecosystem. It delivers 16-bit resolution across all channels, each equipped with a divide-by-10 attenuator stage and three-pole low-pass filter. The module multiplexes all 32 channels to a single output, enabling expanded channel density in DAQ systems. Input protection circuitry safeguards against overvoltage events up to ±60 V on the SCXI-1104/C variant.
– Technical Specifications
• Channels: 32 differential analog inputs
• Resolution: 16 bits
• Input Voltage Range: 30 VACrms, ±42 VACpeak, or ±60 VDC
• Attenuator: Divide-by-10 stage per channel
• Input Protection: ±60 V (SCXI-1104/C)
• Low-Pass Filter: Three-pole topology
– SCXI-1104: 2 Hz cutoff
– SCXI-1104C: 10 kHz cutoff
• Front Connector: 96-pin male DIN C
• Rear Connector: AMP Inc. 50-pin male ribbon-cable header
• Dimensions: 4.54 by 10.75 inches (SCXI-1104C)
• Power: Chassis-supplied
• Operating Temperature: 0 to 50 °C
• Warm-up Time: 20 minutes recommended
– Key Features
• All 32 channels multiplex to single DAQ device input for channel expansion
• Per-channel attenuator enables measurement of higher-voltage signals
• Three-pole low-pass filtering reduces noise; 2 Hz cutoff variant targets 60 Hz rejection
• Differential input architecture for noise immunity
• Periodic calibration addresses offset and gain drift over temperature and time
– Compatibility & Integration
• Integrates with SCXI-1000, SCXI-1001, SCXI-1000DC, and PXI/SCXI combination chassis
• Multi-chassis ribbon-cabled systems require SCXI-1346 adapter
• NI-DAQ driver software (version 6.5.1 or higher recommended for SCXI-1104C)
• Supported development environments: LabVIEW, BridgeVIEW, LabWindows/CVI, Visual Basic (ComponentWorks), C/C++, VirtualBench, Measure, VI Logger
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