Description

The National Instruments(NI)SCXI-1104C is a high-performance 32 channel,high voltage input module designed specifically for NI’s Signal Conditioning Extension Instrument(SCXI)platform.As a part of the SCXI system,SCXI-1104C is mainly used to condition medium to high voltage signals and convert them into low-noise,high-precision digital data for subsequent processing through NI’s data acquisition(DAQ)devices.

The core function of SCXI-1104C is its 32 differential analog input channels,each equipped with a 3-pole low-pass filter with a cutoff frequency of 10 kHz.This enables the module to effectively filter out high-frequency noise and ensure the integrity of the measurement signal.It can process voltage signals up to±60 VDC or±42 VACpeak,which is very useful for measuring various sensor outputs,battery voltages,or other medium to high voltage signals in industrial environments.

This module multiplex all 32 channels into one output,driving a single input channel of the connected DAQ device,effectively expanding the number of channels in the DAQ system.The SCXI system is typically used in conjunction with NI’s LabVIEW,LabWindows/CVI,and other software to provide users with a complete measurement and automation solution.Although the SCXI platform may now be replaced by newer platforms such as PXI or CompactRIO,the SCXI-1104C remains a reliable and critical component in many existing systems,particularly suitable for voltage measurement applications that require high channel count,multiplexing,and good signal conditioning.

SCXI-1104C NI

technical specifications

Manufacturer:National Instruments(NI)

Product Model:SCXI-1104C

Product type:Analog voltage input module

Number of channels:32 differential channels

Input voltage range:±60 VDC or±42 VACpeak/30 VACrms

Maximum operating voltage:The voltage between each input and ground should be within±60 VDC

Input protection:42 VACpeak or±60 VDC(input damage level)

Common mode input range:CH<;0..31>±60 VDC relative to CGND

Filter:3-pole low-pass Butterworth filter

Cut off frequency(-3dB):10 kHz

Input impedance:1 MΩ(when powered on normally)

Input bias current:±0.5 nA

CMRR(Common Mode Rejection Ratio):70 dB(50 to 60 Hz,DC)

Output range:±10 V

Minimum sampling interval:3µs(0.012%accuracy)/10µs(0.0061%accuracy)

System noise:500µVrms(input)

Accuracy:0.01%FSR(calibrated)

Connector:Front:96 pin DIN C-type male connector;Rear:50 pin male cable head

Recommended preheating time:20 minutes

Calibration cycle:at least once a year

Working temperature:0°C to 50°C

Storage temperature:-55°C to 150°C

Relative humidity:5%to 90%RH(non condensing)

Size:11.5 x 27.3 cm(4.54 x 10.75 inches)

Power consumption:+5V power supply:15mA max;±15 V power supply:150 mA max

Compatible software:NI-DAQ(version 6.5.1 or higher),LabVIEW,LabWindows/CVI,C/C++,Visual Basic,etc

Main features and advantages

The NI SCXI-1104C module,with its unique design and functionality,provides multiple advantages in data acquisition and signal conditioning applications:

High channel voltage input:Provides 32 differential input channels,capable of simultaneously measuring a large number of voltage signals.The differential input mode effectively suppresses common mode noise and improves measurement accuracy,especially suitable for industrial environments with high noise levels.

High voltage measurement capability:Supports an input range of up to±60 VDC or±42 VACpeak,making it suitable for measuring medium to high voltage signals and expanding the application range of traditional data acquisition cards.

Built in 10 kHz low-pass filter:Each channel is integrated with a 10 kHz low-pass filter,effectively suppressing high-frequency noise and aliasing effects,ensuring the purity and accuracy of measurement data,especially when collecting rapidly changing voltage signals.

Channel expansion function:By multiplexing all channels into a single input channel of the DAQ device,the SCXI-1104C can significantly expand the number of channels in the DAQ system,thereby achieving high channel data acquisition in a more economical way.

Powerful noise resistance:In addition to differential inputs and filters,the SCXI chassis itself also provides good shielding,further enhancing the overall system’s noise resistance and ensuring reliable measurement results in electrical noise environments.

Software Integration and Usability:Seamless integration with NI’s DAQmx driver software and application development environments such as LabVIEW,LabWindows/CVI simplifies system configuration,programming,and data analysis processes.Users can quickly develop measurement applications using familiar NI software tools.

Durable Design:As part of the SCXI platform,the SCXI-1104C module adopts a robust industrial grade design,suitable for various application environments such as laboratories and industrial sites,ensuring long-term reliable operation.

SCXI-1104C NI

application area

The NI SCXI-1104C module is widely used in various industrial,scientific,and testing measurement fields that require multi-channel,high-precision voltage measurement and signal conditioning:

Industrial automation and process control:used to monitor various voltage signals in factory equipment,such as sensor outputs,power supply voltages,motor control signals,etc.,supporting equipment diagnosis,performance monitoring,and process optimization.

Automotive testing:Used in the testing of automotive electronics,power systems,and body electrical systems to measure the voltage output of multiple sensors and control units for performance evaluation and fault diagnosis.

Electricity and Energy:Used in power systems,energy management,and smart grid applications to monitor battery pack voltage,power supply fluctuations,low-voltage side voltage,etc.,for energy efficiency analysis and system health assessment.

Structural health monitoring:In bridges,buildings,or large mechanical equipment,voltage output sensors(such as vibration sensors,strain gauge amplifiers)are used to monitor the structural response at multiple points and evaluate the structural health status.

Environmental monitoring:At environmental monitoring stations,it is used to collect data from various voltage output environmental sensors(such as light intensity,wind speed,humidity sensors,etc.)for long-term monitoring and analysis of environmental parameters.

General data collection and research and development:As a multifunctional voltage input solution in research laboratories,product development,and quality control fields,it is used for prototype testing,performance characterization,and data recording.

Related products

The products related to NI SCXI-1104C module mainly include NI’s SCXI platform components and compatible DAQ devices and software:

NI SCXI Chassis:Examples include SCXI-1000,SCXI-1001,or SCXI-1000DC,which provide power,SCXIbus communication,and module installation slots and are the foundation of the SCXI system.

NI DAQ devices:multifunctional DAQ cards such as PCI-60xxE,PCI-62xx,or PXI-60xx series,which communicate with SCXI modules through SCXIbus for analog-to-digital conversion and data transmission.

NI SCXI-1300 series terminal blocks,such as SCXI-1320,provide convenient screw terminal blocks for connecting external signals to the SCXI-1104C module.

NI SCXI-1104:Similar in function to SCXI-1104C,but with a filter cutoff frequency of 2 Hz,suitable for collecting signals with slower changes.

NI SCXI-1100,SCXI-1102B/C:Other SCXI analog input modules may have different channel numbers,input ranges,or filter characteristics.

NI DAQmx driver software:NI’s latest data acquisition driver software used for configuring and controlling SCXI modules and DAQ devices.

NI LabVIEW:A graphical programming environment used for developing data acquisition,analysis,and visualization applications.

NI LabWindows/CVI:A development environment based on C language,which also supports programming for SCXI and DAQ devices.

NI Measurement&Automation Explorer(MAX):NI’s configuration and testing tool used for hardware configuration and self-test of SCXI systems and DAQ devices.

Installation and maintenance

Preparation before installation:

Before installing the NI SCXI-1104C module,please carefully read the user manual of the NI SCXI chassis and the detailed user manual of the SCXI-1104C module.Ensure that the installation environment meets the temperature,humidity,and electromagnetic compatibility(EMC)requirements of the module.Before performing any operation,please ensure that the SCXI chassis is powered off and take all necessary safety precautions.

Carefully insert the SCXI-1104C module into the vacant slot of the SCXI chassis,ensuring that the module is fully inserted and locked in place.Then,according to your measurement requirements,connect the appropriate SCXI terminal block(such as SCXI-1320)to the front connector of the SCXI-1104C module.Connect the external analog voltage signal to the input channel of the module through the terminal block.Finally,ensure that the SCXI chassis is properly connected to the NI DAQ device via SCXIbus and that the DAQ device is installed in the computer.

Maintenance suggestion:

To ensure the long-term stable operation of the NI SCXI-1104C module and the accuracy of the measurement system,it is recommended to perform the following maintenance:

Regular calibration:NI recommends calibrating the SCXI-1104C module at least once a year or when the module is operating outside the specified temperature range.Calibration can be performed using NI-DAQ software in conjunction with a high-precision digital multimeter to correct gain and offset errors and ensure measurement accuracy.

Environmental cleanliness:Keep the interior of the SCXI chassis clean,regularly remove dust and pollutants from modules and connectors to ensure good heat dissipation and electrical connections.

Connection check:Regularly check whether all cable connections(including signal lines,terminal block connections,and SCXIbus connections)are secure to prevent data loss or measurement errors caused by looseness.

Software update:Timely update NI-DAQ driver software and application development environments such as LabVIEW/LabWindows/CVI to obtain the latest features,performance improvements,and bug fixes.

Self check and diagnosis:Use the self check and diagnostic tools in NI Measurement&Automation Explorer(MAX)to regularly check the health status of the SCXI-1104C module and eliminate potential hardware issues.

Temperature considerations:Pay attention to the operating temperature range of the module(0°C to 50°C),ensure that the SCXI chassis has sufficient ventilation,and avoid module overheating.

SCXI-1104C NI

Product Guarantee

National Instruments(NI)provides product assurance for the SCXI-1104C module.