Description
NI SCXI-1104C
Technical Specifications Brand: NI Model: SCXI-1104C Channel Count: 32 differential analog input channels Input Range: ±300 mV, ±1 V, ±5 V, ±10 V selectable Galvanic Isolation: 250 Vrms channel-to-chassis isolation Filter: Built-in low pass filter Multiplexer: Onboard analog multiplexer Operating Temperature: 0°C to +50°C Protection Grade: IP20 Mounting: Plug into SCXI chassis slot
Functional Features 32 differential analog input channels for multi-channel voltage measurement. Galvanic isolation blocks ground loop potential difference and protects DAQ hardware. Software selectable input voltage ranges adapt to different sensor output levels. Built-in low-pass filter reduces high frequency noise from field signal. Onboard analog multiplexer sequentially switches each channel onto SCXI backplane analog bus. Overvoltage protection for each input channel. Front screw terminal block for field sensor wiring.
Application Scenarios Multi-channel thermocouple and voltage sensor measurement, industrial test bench signal acquisition, vibration sensor data logging, machine health monitoring, automated product functional test system.
Performance Parameters High common-mode noise rejection from isolation circuit. Low measurement error for small voltage signals. Continuous channel overvoltage protection. Stable signal filtering for high frequency interference suppression. Consistent channel switching timing for synchronized sampling.
Material Composition Front Panel: Flame retardant black plastic with terminal block. PCB: FR4 multilayer printed circuit board with conformal coating. Core Components: Analog multiplexer, isolation amplifier, low-pass filter circuit, surge protection components. Terminal Block: Screw clamp plastic terminal block. Back Connector: Gold plated edge connector for SCXI chassis backplane.
Structural Features Plug-in module form factor for SCXI chassis. Front panel integrated with multi-channel screw terminal block. Rear gold finger connector plugs into chassis backplane. Internal PCB layout separates isolated field circuit and chassis bus circuit. Side latch locks module in chassis slot.
Working Principle Field analog voltage signals connect to front terminal block. Signal enters isolation amplifier to create galvanic separation between field and measurement side. Low-pass filter removes high-frequency noise. Analog multiplexer selects each channel sequentially and outputs conditioned voltage to SCXI chassis analog backplane bus. DAQ hardware reads signal value over bus. Each channel circuit has overvoltage protection to prevent damage from transient voltage spikes.
Installation Requirements Power off SCXI chassis before inserting module into chassis slot. Lock side latch after insertion. Wire field sensor signals to front screw terminals. Configure input voltage range via NI measurement software. Use shielded twisted pair wiring for sensor cables. Separate signal wiring from high voltage power cables.
Usage Notes Do not apply voltage exceeding 250 Vrms isolation rating to input terminals. Check terminal screw tightness before measurement. Wear anti-static wristband during module replacement. Do not connect current source signal directly to voltage input channels. Keep front terminal area free of dust and conductive debris.
