Product Introduction
The NI-9252 is an 8-channel C Series voltage input module designed for high-accuracy data acquisition, industrial measurement, automated test, research, control-system monitoring, and multi-channel voltage measurement applications.
The NI-9252 provides 8 differential analog input channels, a ±10 V input range, 24-bit resolution, and sampling rates up to 50 kS/s per channel.
Unlike general-purpose multiplexed voltage modules, the NI-9252 is designed for synchronized multi-channel acquisition and includes programmable hardware filtering that can help reduce measurement noise before data reaches the host application.
Product Overview
The National Instruments NI-9252 belongs to the NI C Series family and can be installed in compatible CompactDAQ and CompactRIO chassis.
A typical measurement architecture is:
Voltage Signals / Conditioned Sensors → NI-9252 → CompactDAQ or CompactRIO → Host Software
The module is suitable for systems requiring multiple accurately synchronized voltage measurements with higher resolution than conventional 16-bit DAQ hardware.
Key Features
8 Differential Analog Input Channels
The NI-9252 provides 8 differential analog input channels.
Differential input architecture is useful for applications where signals need improved rejection of common-mode electrical noise compared with simple single-ended measurement configurations.
Typical applications include:
- Voltage monitoring
- Electronic validation
- Industrial measurement
- Automated test
- Control-system monitoring
- Laboratory research
- Multi-channel data acquisition
±10 V Input Range
Each NI-9252 analog input channel supports a nominal measurement range of -10 V to +10 V.
This voltage range makes the module suitable for many conditioned sensor outputs, industrial voltage signals, electronic test points, and general-purpose analog measurements.
24-Bit Resolution
The NI-9252 provides 24-bit analog input resolution.
The high-resolution architecture is useful for applications where relatively small signal changes must be measured accurately across a ±10 V input range.
50 kS/s per Channel Sampling
The NI-9252 supports sampling rates up to 50 kS/s per channel.
Because each channel can operate at this rate, the module is well suited for multi-channel measurement applications requiring synchronized acquisition of moderately fast signals.
Simultaneous Multi-Channel Acquisition
The NI-9252 is designed for synchronized multi-channel acquisition across its eight voltage inputs.
This capability is important for measurements where timing relationships between channels matter.
Applications can include:
- Multi-sensor testing
- Power and control-system measurements
- Phase-related voltage acquisition
- Transient monitoring
- Electronic system validation
Programmable Hardware Filters
One of the distinctive features of the NI-9252 is its programmable hardware filtering.
The module provides selectable filtering options including:
- Butterworth filters
- Comb filters
These hardware filters can help reduce unwanted measurement noise before the acquired data is processed by the host application.
Butterworth Filtering
Butterworth filtering can be useful when the application requires a relatively flat passband response while attenuating higher-frequency noise.
This can improve measurement quality in applications where broadband noise would otherwise reduce useful signal resolution.
Comb Filtering
Comb filters can be useful for suppressing repetitive interference components associated with periodic electrical noise.
The correct filter configuration should be selected according to the signal bandwidth and noise characteristics of the measurement system.
CompactDAQ Compatibility
The NI-9252 can be installed in compatible CompactDAQ chassis for PC-based data acquisition.
A typical architecture is:
Sensors → NI-9252 → CompactDAQ Chassis → USB / Ethernet / Other Host Interface → Computer
This configuration is useful for laboratory measurement, automated test, production test, and distributed data acquisition.
CompactRIO Compatibility
The NI-9252 can also be used with compatible CompactRIO hardware.
CompactRIO integration is useful for systems requiring:
- Embedded measurement
- Industrial monitoring
- Real-time control
- FPGA-based processing
- Distributed measurement
- Rugged test systems
Technical Specifications
| Parameter | Specification |
|---|---|
| Product Type | C Series Voltage Input Module |
| Model | NI-9252 |
| Manufacturer | National Instruments |
| Supported Platform | C Series / CompactDAQ / CompactRIO |
| Analog Input Channels | 8 Differential |
| Analog Input Range | -10 V to +10 V |
| Analog Input Resolution | 24 Bit |
| Maximum Sample Rate | 50 kS/s per Channel |
| Multi-Channel Acquisition | Simultaneous / Synchronized |
| Programmable Hardware Filtering | Supported |
| Filter Types | Butterworth and Comb |
| Part Number – Screw Terminal | 786782-01 |
| Part Number – D-SUB | 786783-01 |
| Primary Applications | Data Acquisition, Automated Test, Industrial Measurement, Research and Voltage Monitoring |
NI-9252 Part Numbers
The NI-9252 is available in different front-connection configurations. The electrical measurement functionality is closely related, but the connector type differs.
| Part Number | Connection Type | Configuration |
|---|---|---|
| 786782-01 | Screw Terminal | NI-9252 with Screw Terminal Connection |
| 786783-01 | D-SUB | NI-9252 with D-SUB Connection |
When requesting a quotation or replacing an existing NI-9252, provide the complete part number to ensure the correct connector configuration.
Screw Terminal vs D-SUB NI-9252
| Feature | 786782-01 | 786783-01 |
|---|---|---|
| Module | NI-9252 | NI-9252 |
| Analog Inputs | 8 | 8 |
| Resolution | 24 Bit | 24 Bit |
| Sample Rate | 50 kS/s/ch | 50 kS/s/ch |
| Input Range | ±10 V | ±10 V |
| Connection | Screw Terminal | D-SUB |
| Typical Advantage | Convenient Field Wiring | Harness / Cable Integration |
NI-9970 Screw Terminal Plug
NI lists the NI-9970 18-position screw terminal plug with the screw-terminal version of the NI-9252.
This accessory is associated with part number 786782-01.
When purchasing a used or replacement NI-9252, verify whether the required removable terminal plug is included.
How Does the NI-9252 Work?
The NI-9252 converts analog voltage signals into high-resolution digital measurement data.
A simplified acquisition path is:
Voltage Signal → NI-9252 Analog Input → ADC → Hardware Filter → C Series Chassis → Host Application
The acquired measurements can then be displayed, analyzed, logged, processed, or used as part of an automated control or test system.
What Is a C Series Voltage Input Module?
A C Series voltage input module provides analog measurement channels for compatible CompactDAQ and CompactRIO systems.
C Series architecture allows engineers to combine different module types in one chassis, including:
- Voltage input modules
- Current input modules
- Temperature modules
- Strain and bridge modules
- Digital I/O modules
- Relay modules
- Communication modules
This modular architecture makes it possible to customize the measurement system according to the application.
High-Resolution Voltage Measurement
The 24-bit ADC architecture allows the NI-9252 to capture small voltage changes with high digital resolution.
This is useful for applications involving:
- Precision sensor measurements
- Low-level signal changes
- Electronic validation
- Long-duration monitoring
- Laboratory measurement
Actual system accuracy also depends on signal conditioning, noise, grounding, chassis configuration, wiring, calibration, and environmental conditions.
Multi-Channel Data Acquisition
With eight analog inputs, the NI-9252 can acquire several voltage signals in one module.
A typical system could measure:
CH0 → Sensor 1
CH1 → Sensor 2
CH2 → Voltage Test Point
CH3 → Control Signal
CH4–CH7 → Additional Signals
This reduces the number of modules required in applications where multiple ±10 V signals need to be monitored.
Electronic Validation
The NI-9252 is suitable for electronic validation systems requiring synchronized acquisition of multiple voltage signals.
Typical measurements include:
- Power-supply rails
- Control voltages
- Sensor outputs
- Reference voltages
- Analog circuit outputs
- System response signals
Automated Test
The NI-9252 can be incorporated into automated test systems using CompactDAQ or CompactRIO.
A typical test sequence can:
- Configure the required NI-9252 channels.
- Set the acquisition rate.
- Select the appropriate hardware filter.
- Start synchronized acquisition.
- Apply stimulus to the DUT using other test hardware.
- Acquire the DUT voltage response.
- Analyze the measurements.
- Determine pass or fail status.
Industrial Monitoring
The NI-9252 can monitor voltage outputs from compatible industrial sensors and control equipment.
Applications include:
- Machine monitoring
- Process monitoring
- Control-system validation
- Equipment diagnostics
- Condition monitoring
- Industrial research
Sensor Measurement
The NI-9252 directly measures voltage signals. Sensors producing a compatible voltage output can be connected directly when their electrical characteristics meet the module specifications.
Other sensor types may require external signal conditioning.
Examples include:
- Current-output sensors
- Bridge sensors
- Thermocouples
- RTDs
- IEPE sensors
- High-voltage sensors
Programmable Filtering
Programmable filtering is one of the features that distinguishes the NI-9252 from simpler voltage input modules.
A simplified signal chain is:
Sensor Signal + Noise → NI-9252 Hardware Filter → Reduced Unwanted Frequency Content → Measurement Data
The appropriate filter should be selected according to the useful signal bandwidth and interference frequencies present in the system.
50 kS/s/ch vs Aggregate Sampling
The NI-9252 specification is 50 kS/s per channel, not a single 50 kS/s aggregate rate shared across all eight inputs.
This distinction is important when comparing the NI-9252 with conventional multiplexed multifunction DAQ hardware.
| Architecture | NI-9252 | Typical Multiplexed DAQ |
|---|---|---|
| Specified Sampling | 50 kS/s/ch | Often Aggregate |
| Multi-Channel Timing | Synchronized | Sequential |
| Channel-to-Channel Relationship | Preserved | Includes Multiplexing Delay |
NI-9252 vs NI-9239
The NI-9252 and NI-9239 are both ±10 V, 24-bit C Series voltage input modules with 50 kS/s/ch acquisition capability, but the channel count is an important difference.
| Feature | NI-9252 | NI-9239 |
|---|---|---|
| Input Range | ±10 V | ±10 V |
| Resolution | 24 Bit | 24 Bit |
| Sample Rate | 50 kS/s/ch | 50 kS/s/ch |
| Analog Input Channels | 8 | 4 |
| Primary Advantage | Higher Channel Density | Lower Channel Count |
NI-9252 vs NI-9229
The NI-9229 provides a wider voltage range, while the NI-9252 provides more channels for ±10 V measurement.
| Feature | NI-9252 | NI-9229 |
|---|---|---|
| Input Channels | 8 | 4 |
| Input Range | ±10 V | ±60 V |
| Resolution | 24 Bit | 24 Bit |
| Sample Rate | 50 kS/s/ch | 50 kS/s/ch |
| Best Fit | Higher Channel Count ±10 V | Higher Voltage Measurement |
NI-9252 vs NI-9320
The NI-9252 emphasizes high resolution and synchronized multi-channel acquisition, while the NI-9320 is designed for applications requiring higher general-purpose sampling performance and additional channels.
| Feature | NI-9252 | NI-9320 |
|---|---|---|
| Analog Inputs | 8 | 16 |
| Input Range | ±10 V | ±10 V |
| Resolution | 24 Bit | 16 Bit |
| Maximum Sampling | 50 kS/s/ch | Up to 200 kS/s |
| Primary Strength | High Resolution + Filtering | Higher Channel Count / Faster General DAQ |
NI-9252 with CompactDAQ
A CompactDAQ system using the NI-9252 is suitable for PC-based measurements.
A typical system includes:
- CompactDAQ chassis
- NI-9252 module
- Additional C Series modules
- Host computer
- NI-DAQmx
- LabVIEW or other supported software
CompactDAQ is generally well suited for laboratory, automated test, and data-logging systems.
NI-9252 with CompactRIO
A CompactRIO system can combine the NI-9252 with embedded processing, real-time software, and compatible FPGA resources.
A typical architecture is:
Voltage Signals → NI-9252 → CompactRIO → Real-Time / FPGA Processing → Control or Logging
This is useful for industrial monitoring, embedded test, deterministic control, and distributed measurement applications.
NI-DAQmx Integration
When used in compatible CompactDAQ hardware, the NI-9252 can be configured through NI-DAQmx.
Typical configuration tasks include:
- Create analog input channels
- Select input range
- Configure sample rate
- Configure acquisition timing
- Configure supported hardware filtering
- Start acquisition
- Read measurement data
- Log or analyze data
LabVIEW Integration
The NI-9252 can be integrated into compatible LabVIEW applications for measurement, automated testing, monitoring, and data logging.
A typical workflow is:
Configure Module → Create Channels → Configure Timing → Acquire Data → Filter / Analyze → Display / Log Results
CompactRIO FPGA Applications
When installed in a compatible CompactRIO system, NI-9252 data can be incorporated into FPGA and real-time architectures depending on the chassis and programming mode.
Applications can include:
- Real-time threshold monitoring
- Embedded condition monitoring
- Closed-loop test systems
- FPGA-based event detection
- Industrial diagnostics
Signal Wiring Considerations
Before connecting signals to the NI-9252, verify:
- Signal voltage range
- Differential wiring
- Signal source grounding
- Common-mode voltage
- Cable shielding
- Electrical noise
- Connector type
- Terminal plug or D-SUB harness
Incorrect grounding or wiring can reduce measurement accuracy even when the signal amplitude is within the nominal ±10 V input range.
Noise Reduction
High-resolution measurement systems require careful attention to electrical noise.
Noise can be reduced through:
- Proper differential wiring
- Shielded cables
- Shorter signal paths where practical
- Correct grounding
- Appropriate hardware filter selection
- Separation from high-power switching equipment
Legacy System Replacement
When replacing an existing NI-9252, verify more than the model number.
Important compatibility factors include:
- Exact part number
- Screw terminal or D-SUB configuration
- CompactDAQ or CompactRIO chassis model
- Required sample rate
- Required filter configuration
- Existing terminal plug or cable
- NI-DAQmx version
- LabVIEW version
- CompactRIO software environment
- Operating system compatibility
How to Choose a C Series Voltage Input Module
Before selecting the NI-9252, determine:
- Required analog input channel count
- Required voltage range
- Required sample rate per channel
- Required analog resolution
- Need for synchronized acquisition
- Noise-filtering requirements
- CompactDAQ or CompactRIO platform
- Terminal or D-SUB connection preference
- Isolation requirements
- Software and driver compatibility
Industries
- Automated Test
- Industrial Measurement
- Electronic Validation
- Research and Development
- Laboratory Automation
- Manufacturing Test
- Control-System Testing
- Energy Systems
- Automotive Testing
- Aerospace Testing
Applications
Multi-Channel Voltage Measurement
The NI-9252 provides eight ±10 V analog input channels for synchronized multi-channel voltage acquisition.
Automated Test
The module can acquire multiple DUT voltage signals as part of CompactDAQ or CompactRIO automated test systems.
Electronic Validation
High-resolution synchronized voltage inputs are suitable for validating control signals, supply rails, sensor outputs, and analog circuits.
Industrial Monitoring
The NI-9252 can monitor conditioned voltage outputs from industrial sensors and equipment.
Laboratory Data Acquisition
24-bit resolution and programmable hardware filtering make the NI-9252 useful for laboratory measurement and research applications.
CompactRIO Measurement
The module can be incorporated into embedded CompactRIO systems requiring synchronized analog voltage acquisition.
Recommended Related Products
| NI-9252 | 8-channel, ±10 V, 24-bit, 50 kS/s/ch C Series voltage input module with programmable filtering. |
| NI-9239 | 4-channel, ±10 V, 24-bit, 50 kS/s/ch simultaneous voltage input module. |
| NI-9229 | 4-channel, ±60 V, 24-bit, 50 kS/s/ch module for higher-voltage measurements. |
| NI-9242 | C Series module for higher-voltage electrical and power measurement applications. |
| NI-9320 | 16-channel ±10 V module for applications requiring higher channel count and different sampling performance. |
Why Choose NI-9252?
- 8 differential analog input channels
- ±10 V measurement range
- 24-bit resolution
- 50 kS/s per channel
- Synchronized multi-channel acquisition
- Programmable hardware filtering
- Butterworth filter options
- Comb filter options
- CompactDAQ compatibility
- CompactRIO compatibility
- Screw-terminal configuration available
- D-SUB configuration available
- Suitable for automated test
- Suitable for electronic validation
- Suitable for industrial measurement
- Suitable for laboratory research
Frequently Asked Questions
What is the NI-9252?
The NI-9252 is an 8-channel C Series analog voltage input module that provides a ±10 V input range, 24-bit resolution, and sampling rates up to 50 kS/s per channel.
How many analog inputs does NI-9252 have?
The NI-9252 provides 8 differential analog input channels.
What is the input voltage range of NI-9252?
Each channel provides a nominal measurement range of -10 V to +10 V.
What is the resolution of NI-9252?
The NI-9252 provides 24-bit analog input resolution.
What is the maximum sampling rate of NI-9252?
The NI-9252 supports sampling rates up to 50 kS/s per channel.
Is 50 kS/s shared across all eight channels?
No. The NI-9252 is specified at 50 kS/s per channel, making it suitable for synchronized multi-channel acquisition.
Does NI-9252 support simultaneous sampling?
The NI-9252 is designed for synchronized multi-channel acquisition across its eight analog input channels, making it suitable for measurements where channel timing relationships are important.
Does NI-9252 have hardware filtering?
Yes. The NI-9252 includes programmable hardware filters, including configurable Butterworth and comb filtering options.
What are the NI-9252 part numbers?
The main configurations are 786782-01 for the screw-terminal version and 786783-01 for the D-SUB version.
What is the difference between NI-9252 786782-01 and 786783-01?
The primary difference is the front connection. Part number 786782-01 uses a screw-terminal connection, while 786783-01 uses a D-SUB connection.
Does the screw-terminal NI-9252 include a terminal plug?
NI lists the NI-9970 18-position screw terminal plug with the screw-terminal configuration, part number 786782-01.
Can NI-9252 be used with CompactDAQ?
Yes. The NI-9252 is designed for compatible CompactDAQ chassis and can be used for PC-based data acquisition and automated test.
Can NI-9252 be used with CompactRIO?
Yes. The module is also compatible with supported CompactRIO hardware for embedded measurement, monitoring, and control applications.
What is the difference between NI-9252 and NI-9239?
Both provide ±10 V input, 24-bit resolution, and 50 kS/s/ch acquisition. The NI-9252 provides 8 analog input channels, while the NI-9239 provides four.
What is the difference between NI-9252 and NI-9229?
The NI-9252 provides eight ±10 V channels, while the NI-9229 provides four channels with a wider ±60 V input range. Choose according to required voltage range and channel count.
Can NI-9252 measure thermocouples directly?
The NI-9252 is primarily a voltage input module. Dedicated thermocouple measurement typically requires cold-junction compensation and sensor-specific signal conditioning, so a C Series temperature module is generally more appropriate.
Can NI-9252 measure current directly?
The NI-9252 measures voltage rather than current directly. Current signals require an appropriate shunt or signal-conditioning arrangement, or a dedicated C Series current input module.
What should I check before purchasing NI-9252?
Verify the required eight-channel configuration, ±10 V range, 24-bit resolution, 50 kS/s/ch rate, hardware filtering requirements, CompactDAQ or CompactRIO chassis compatibility, screw-terminal or D-SUB connection, NI-DAQmx or CompactRIO software compatibility, and existing wiring.
Conclusion
The NI-9252 C Series Voltage Input Module combines eight differential analog input channels, a ±10 V measurement range, 24-bit resolution, up to 50 kS/s per channel, synchronized acquisition, and programmable Butterworth and comb hardware filtering. These capabilities make it particularly suitable for automated test, electronic validation, multi-channel data acquisition, industrial monitoring, research, laboratory measurement, and CompactDAQ or CompactRIO systems.
