NI SCXI-1104C 32-Channel Medium-Voltage Input Module

The National Instruments SCXI-1104C is a 32-channel medium-voltage input module that delivers accurate signal conditioning within the SCXI platform. It multiplexes all 32 differential analog input channels into a single output for DAQ device integration, expanding measurement capacity. Each channel incorporates a divide-by-10 attenuator, programmable gain instrumentation amplifier (PGIA), and three-pole lowpass filter with 10 kHz cutoff to reject 60 Hz noise. The module accepts ±60 VDC, 30 VACrms, and ±42 VACpeak signals with independent range programming per channel. Calibration is managed through on-board EEPROM with 2-point correction and NI-DAQ driver integration; factory constants ship pre-loaded. The module features a 96-pin male DIN C front connector and 50-pin male ribbon cable rear connector, operates from 0 to 50 °C, and requires a 20-minute warm-up interval.

– Technical Specifications

• Input Channels: 32 differential analog inputs
• Voltage Range: ±60 VDC, 30 VACrms, ±42 VACpeak
• Attenuator: Divide-by-10 stage per channel
• Filter: Three-pole lowpass, 10 kHz cutoff
• Amplifier: Programmable gain instrumentation amplifier with independent per-channel range selection
• Calibration: 2-point EEPROM calibration with user-modifiable storage; recalibration minimum annually or after temperature excursions
• Input Protection: ±60 V protection circuitry
• Operating Temperature: 0 to 50 °C
• Warm-up Time: 20 minutes recommended
• Front Connector: 96-pin male DIN C
• Rear Connector: 50-pin male ribbon cable

– Key Features

• All 32 channels multiplex to single DAQ device input
• Programmable gain per channel enables flexible signal ranges
• Three-pole filtering attenuates 60 Hz interference
• Factory calibration constants included; transparent correction via NI-DAQ software
• Analog ground selectable via pins 1, 2, 4, or 19

– Typical Applications

• Industrial data acquisition systems requiring high channel count
• Laboratory measurements of medium-voltage signals
• Multi-channel monitoring in production test environments

– Compatibility & Integration

Designed for National Instruments SCXI chassis systems and compatible with NI DAQ devices. Part numbers: 776572-04C, 183087H-05.