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SCXI-1100 is a 32-channel
analog input module specifically designed for the acquisition and conditioning of low-speed millivolt, volt, and current signals. Boasting programmable gain, optional low-pass filtering, and high compatibility, it serves as a cost-effective and reliable signal processing solution for industrial measurement, laboratory testing, and other scenarios.
This module adopts a 32-channel multiplexing architecture, which enables the integration of multi-channel signals into a single data acquisition (DAQ) device channel. It supports expanding the total number of system channels via extension modules, simplifies configuration and measurement processes with NI-DAQ driver software, and is compatible with Windows 2000/NT/XP operating systems as well as various professional software packages including LabVIEW and LabWindows/CVI.
related documents
SCXI1100 Datasheet.pdf
NI SCXI-1100.pdf
Performance Parameters
Signal Input Characteristics
Channel ConfigurationIt provides 32 differential input channels, supporting the measurement of voltage signals in the range of ±100 mV to ±10 V and current signals of 0–20 mA, which meets the acquisition requirements of various low-amplitude signals.
Sampling RateThe sampling rate can reach up to 240 kS/s at full bandwidth (with the maximum gain of 100x). When a 10 kHz low-pass filter is configured, the maximum sampling rate is 6.6 kS/s; when a 4 Hz low-pass filter is configured, the maximum sampling rate is 3 S/s. The sampling rate can be flexibly selected according to signal bandwidth.
Input ProtectionThe module features ±25 V overvoltage protection when powered on, and the overvoltage protection can be up to ±42 V when powered off, effectively preventing damage to the device caused by external voltage surges.
Input Impedance & Bias Current
The input impedance exceeds 1 GΩ under normal operating conditions, and drops to 1.6 kΩ when powered off or overloaded. Both the input bias current and input offset current are ±350 pA. The low input loss ensures high signal acquisition accuracy.
Gain & Filter Functions
Programmable GainThe gain can be adjusted up to 100x. Precise gain control enables adaptation to weak signals of different amplitudes, improving the measurement resolution of small signals.
Low-pass FilteringIt supports three filter modes (4 Hz, 10 kHz, or full bandwidth) selectable via jumpers. The 4 Hz filter is suitable for low-frequency steady-state signals; the 10 kHz filter balances signal integrity and anti-interference capability; the full bandwidth mode meets the acquisition requirements of wide-frequency signals, effectively suppressing high-frequency noise.
Measurement Accuracy & Stability
System NoiseAt full bandwidth mode, the noise is 15 µV rms for the ±10 V range and as low as 6 µV rms for the ±10 mV range. In 4 Hz filter mode, the noise of the ±10 mV range can be reduced to 0.2 µV rms. The low-noise performance ensures the reliability of measurement data.
Temperature DriftThe gain temperature coefficient is 20 ppm/°C, and the offset temperature coefficient is (±4 ±20/gain) µV/°C. Stable accuracy is maintained within the operating temperature range of 15–35 °C. When the ambient temperature exceeds this range, the drift error can be corrected via formula calculation.
LinearityThe full-scale nonlinearity error is ±0.008% of the full scale, featuring excellent conversion characteristics and reducing signal distortion.
Common-Mode Rejection Ratio (CMRR)In the frequency range from DC to 60 Hz, the CMRR can reach 110 dB for the ±10 V to ±2 V ranges in 10 kHz filter mode, and 78 dB for the ±1 V to ±5 mV ranges in 4 Hz filter mode, effectively suppressing common-mode interference.
Hardware Architecture & Interfaces
Internal Structure
The core of the module consists of a 32-to-1 multiplexer, a programmable gain instrumentation amplifier (PGIA), a jumper-selectable low-pass filter, and a digital control interface. Signals from all channels are multiplexed before being processed by a unified amplifier and filter, which simplifies hardware design while ensuring channel consistency. A built-in calibration EEPROM supports software-programmable input grounding calibration, storing zero-offset values for subsequent measurement compensation.
Connection Interfaces
Signal ConnectorEquipped with a 96-pin DIN Type C front-mount signal connector, it is compatible with a variety of terminal blocks including the SCXI-1300, SCXI-1303, and TBX-1303, and supports multiple connection methods such as screw terminals and thermocouple plugs. Among them, terminal blocks like the SCXI-1303 and TBX-1303 feature an isothermal structure and pluggable ground reference function, making them suitable for scenarios such as thermocouple measurement.
DAQ Device ConnectionIt communicates with DAQ devices via the SCXI bus, and supports connecting terminal blocks to DAQ devices using SH96-96 shielded cables or R96-96 ribbon cables. Shielded cables can enhance electromagnetic interference (EMI) resistance.
Recommended Accessories
SCXI Current Resistor (4-pack, P/N: 776582-01): Suitable for current signal measurement.
SH96-96 Shielded Cable (1m, P/N: 183228-01): Enables interference-resistant signal transmission.
R96-96 Ribbon Cable (1m, P/N: 183425-01): A cost-effective connection solution for conventional scenarios.
Application Scenarios
This module is designed for accurate measurement of low-speed, low-amplitude signals, with typical applications including:
Monitoring of parameters such as temperature and pressure in industrial processes (when used with thermocouples and pressure sensors).
Measurement of small-signal physical quantities in laboratories (e.g., acquisition of weak voltage and current signals).
Signal conditioning in multi-channel data acquisition systems (e.g., environmental monitoring and equipment status monitoring).
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