Product Introduction
The NI PXI-6224 is a multifunction PXI data acquisition (DAQ) module designed for general-purpose measurement, automated testing, laboratory research, data logging, and industrial monitoring applications.
The PXI-6224 provides 32 single-ended or 16 differential analog input channels, 16-bit analog input resolution, and a maximum analog input sampling rate of 250 kS/s. It also includes 48 digital I/O lines and two 32-bit counter/timers for digital control, timing, frequency measurement, pulse generation, and automated test applications.
As part of the NI M Series multifunction DAQ family, the PXI-6224 provides a practical combination of channel count, measurement resolution, digital I/O, timing, triggering, and PXI system integration for applications that do not require analog output functionality.
Product Overview
The National Instruments PXI-6224 is designed for applications requiring multiple analog input channels together with extensive digital I/O and counter/timer functionality.
Its analog input subsystem provides up to 32 single-ended or 16 differential channels with 16-bit resolution. The module uses a multiplexed analog input architecture with an aggregate sampling rate of up to 250 kS/s.
Unlike M Series models that include analog outputs, the PXI-6224 focuses on analog acquisition and digital control. This makes it a suitable choice for monitoring, data logging, sensor acquisition, test fixture control, and automated measurement systems where analog signal generation is not required.
Key Features
32 Analog Input Channels
The PXI-6224 provides a high analog input channel count for general-purpose measurement applications.
- 32 single-ended analog input channels
- 16 differential analog input channels
- 16-bit analog input resolution
- Multiplexed acquisition architecture
- Hardware-timed acquisition
- Multi-channel voltage measurement
Advantage: The high channel count allows engineers to monitor multiple analog signals with a single PXI module, reducing the number of DAQ devices required in a test system.
16-Bit Analog Input Resolution
The PXI-6224 uses 16-bit analog-to-digital conversion for general-purpose voltage measurements.
- 16-bit ADC resolution
- 65,536 theoretical quantization levels
- Accurate voltage acquisition
- Sensor signal measurement
- Laboratory and production testing
Advantage: 16-bit resolution provides a useful balance between measurement resolution, acquisition speed, channel count, and system cost.
250 kS/s Analog Input Sampling
The analog input subsystem provides a maximum aggregate sampling rate of 250 kS/s.
- Up to 250 kS/s analog input sampling
- Hardware-timed acquisition
- Continuous data acquisition
- Buffered measurements
- Multi-channel scanning
Advantage: The PXI-6224 provides sufficient acquisition performance for many general-purpose automated test, monitoring, and data logging applications.
Multiplexed Analog Input Architecture
The PXI-6224 uses a multiplexed analog input architecture in which multiple input channels share the analog-to-digital conversion subsystem.
This architecture provides a relatively high analog input channel count within one PXI slot and is particularly suitable for applications where true simultaneous sampling between channels is not required.
- High analog input channel density
- Efficient general-purpose DAQ architecture
- Suitable for monitoring and data logging
- Ideal for sequential multi-channel measurements
48 Digital I/O Lines
The PXI-6224 provides 48 digital I/O lines for device control, status monitoring, and automated test applications.
- 48 digital I/O lines
- Digital input operation
- Digital output operation
- Test fixture control
- Logic-state monitoring
- Automated sequencing
Advantage: Extensive digital I/O allows the module to monitor switches, control relays, interface with digital devices, and coordinate external test hardware.
Correlated Digital I/O
The PXI-6224 supports correlated digital I/O for hardware-timed digital operations.
- Hardware-timed digital acquisition
- Hardware-timed digital generation
- Digital waveform operations
- Synchronization with analog measurements
- Mixed-signal automated testing
Advantage: Correlated digital I/O enables digital events to be synchronized with analog acquisition and other hardware-timed operations.
Two 32-Bit Counter/Timers
The PXI-6224 includes two general-purpose 32-bit counter/timers for timing and pulse-related measurements.
- 2 × 32-bit counter/timers
- Frequency measurement
- Period measurement
- Pulse-width measurement
- Event counting
- Pulse generation
- Encoder measurements
Advantage: Integrated counters provide useful timing and measurement capabilities without requiring a separate counter/timer module.
Hardware Triggering
The PXI-6224 provides hardware triggering capabilities for event-driven and synchronized measurements.
- Digital triggering
- Analog triggering
- Start triggering
- Reference triggering
- Event-based acquisition
- PXI system synchronization
PXI Timing and Synchronization
The PXI-6224 can use PXI timing and trigger resources to coordinate measurements with other instruments in a modular test system.
- PXI trigger bus integration
- Multi-instrument synchronization
- Hardware event routing
- Automated test coordination
- Modular system expansion
Advantage: PXI synchronization makes the PXI-6224 suitable for test systems combining DAQ, switching, oscilloscopes, digital instruments, and other measurement hardware.
NI-DAQmx Software Support
The PXI-6224 is supported by NI-DAQmx for configuration, analog acquisition, digital I/O, counters, timing, and triggering.
- NI-DAQmx driver
- LabVIEW integration
- NI MAX configuration
- TestStand integration
- C/C++ APIs
- .NET application development
Technical Specifications
| Parameter | Description |
|---|---|
| Product Type | PXI Multifunction I/O / Data Acquisition Module |
| Model | NI PXI-6224 |
| Product Family | NI M Series Multifunction DAQ |
| Bus Interface | PXI |
| Analog Inputs | 32 Single-Ended / 16 Differential |
| Analog Input Resolution | 16 Bit |
| Maximum Analog Input Sample Rate | 250 kS/s Aggregate |
| Sampling Architecture | Multiplexed |
| Analog Outputs | None |
| Digital I/O | 48 Lines |
| Correlated Digital I/O | Supported |
| Counter/Timers | 2 |
| Counter Resolution | 32 Bit |
| Hardware Triggering | Supported |
| Driver | NI-DAQmx |
| Primary Applications | Data Acquisition, Monitoring, Data Logging, Automated Test and Laboratory Measurement |
Analog Input Capabilities
The PXI-6224 provides up to 32 single-ended or 16 differential analog inputs for acquiring voltage signals from sensors, electronic circuits, test fixtures, and other devices.
Its 16-bit ADC provides 65,536 theoretical quantization levels, while the 250 kS/s aggregate sampling rate provides sufficient acquisition performance for many general-purpose measurement applications.
Because the PXI-6224 uses multiplexed acquisition, the maximum sampling rate is shared across enabled analog input channels rather than being available independently on every channel.
Single-Ended vs Differential Measurements
The PXI-6224 can be configured for different analog input connection methods depending on the application.
| Configuration | Maximum Channels | Typical Application |
|---|---|---|
| Single-Ended | 32 | Higher channel count and common-ground signals |
| Differential | 16 | Improved noise rejection and measurements with separate signal references |
Differential measurements are often preferred in electrically noisy environments, while single-ended configurations maximize the number of available analog input channels.
Digital I/O Capabilities
The 48 digital I/O lines significantly expand the functionality of the PXI-6224 beyond basic analog acquisition.
- Relay control
- Switch monitoring
- Logic-state acquisition
- Test fixture control
- Device sequencing
- Digital communication experiments
Correlated digital I/O also allows selected digital operations to be hardware timed and synchronized with other measurement tasks.
Counter and Timing Capabilities
Two 32-bit counter/timers provide additional timing functionality for automated test and measurement systems.
- Frequency measurements
- Period measurements
- Pulse-width measurements
- Event counting
- Pulse generation
- Encoder measurements
Software Ecosystem
The NI PXI-6224 integrates with the NI-DAQmx software ecosystem for measurement, control, timing, triggering, and automation.
- NI-DAQmx: Provides the hardware driver and APIs for analog input, digital I/O, counters, triggering, and timing.
- LabVIEW: Enables development of customized data acquisition, monitoring, control, and automated measurement applications.
- NI MAX: Provides hardware discovery, device configuration, self-test, and basic measurement functionality.
- TestStand: Allows PXI-6224 measurements and control functions to be incorporated into automated validation and production test sequences.
- C/C++ and .NET: Support development of custom DAQ applications through compatible NI-DAQmx APIs.
Industries
- Electronic Manufacturing
- Industrial Measurement
- Automated Test Equipment
- Research Laboratories
- Universities and Education
- Automotive Testing
- Product Development
- Laboratory Automation
Applications
General-Purpose Data Acquisition
The PXI-6224 is suitable for acquiring multiple voltage signals in general-purpose measurement systems.
- Voltage measurements
- Multi-channel data acquisition
- Sensor monitoring
- Automated data collection
- Laboratory experiments
Data Logging
The combination of 32 analog inputs and PXI system integration makes the PXI-6224 useful for multi-channel data logging.
- Long-term signal monitoring
- Environmental measurements
- Machine monitoring
- Experimental data recording
- Process monitoring
Automated Functional Testing
Analog acquisition, extensive digital I/O, counters, and hardware triggering allow the PXI-6224 to perform multiple functions within automated test stations.
- PCB functional testing
- Electronic device validation
- Automated pass/fail testing
- Test fixture control
- Production test systems
Design Verification
Engineers can use the PXI-6224 to monitor multiple signals during product development and design validation.
- Prototype measurements
- Hardware debugging
- Electronic design verification
- Performance monitoring
- Automated validation
Industrial Monitoring
The PXI-6224 can acquire multiple analog and digital signals from industrial equipment when the application’s voltage, grounding, and isolation requirements are compatible with the module.
- Machine monitoring
- Process signal acquisition
- Equipment status monitoring
- Automated data logging
PXI-6224 vs Simultaneous-Sampling DAQ
| Feature | PXI-6224 | Simultaneous-Sampling DAQ |
|---|---|---|
| Analog Input Architecture | Multiplexed | Simultaneous Sampling |
| Maximum AI Channels | 32 Single-Ended / 16 Differential | Typically Lower |
| Channel Acquisition | Sequential | Simultaneous |
| Primary Advantage | High Channel Count | Channel-to-Channel Timing |
| Best Application | General DAQ and Monitoring | Dynamic and Phase-Related Measurements |
Comparison with Similar NI Multifunction I/O Modules
| Model | Main Difference | Best Application |
|---|---|---|
| NI PXI-6224 | 32 AI, 16-bit, 250 kS/s aggregate sampling and 48 DIO without analog outputs. | General-purpose analog acquisition and digital control |
| NI PXI-6225 | Higher analog input channel count for applications requiring substantially more measurement channels. | High-channel-count data acquisition |
| NI PXI-6221 | Related M Series multifunction DAQ that includes analog output functionality. | General measurement and analog stimulus applications |
| NI PXI-6259 | Higher-performance M Series module with 32 AI, faster analog acquisition and four analog outputs. | Higher-speed multifunction data acquisition |
| NI PXI-6284 | High-accuracy M Series module with 18-bit analog input resolution. | Precision voltage measurements |
Recommended Related Products
| NI PXI-6225 | Recommended when an application requires a larger number of analog input channels while remaining within the M Series DAQ platform. |
| NI PXI-6259 | Suitable for applications requiring higher analog acquisition speed plus analog output functionality. |
| NI PXI-6284 | High-accuracy alternative for applications where analog measurement resolution and precision are higher priorities. |
| NI PXI-6143 | Simultaneous-sampling alternative for applications requiring precise time correlation between multiple analog input channels. |
Why Choose NI PXI-6224?
- 32 single-ended or 16 differential analog inputs
- 16-bit analog input resolution
- Up to 250 kS/s aggregate sampling
- 48 digital I/O lines
- Correlated digital I/O capability
- 2 × 32-bit counter/timers
- Hardware triggering
- PXI timing and synchronization
- NI-DAQmx software support
- High analog input channel density
- Suitable for general-purpose measurement
- Ideal for data logging and monitoring
- Useful for automated functional testing
- Designed for modular PXI measurement systems
Frequently Asked Questions
What is the NI PXI-6224?
The NI PXI-6224 is an M Series PXI multifunction data acquisition module providing 32 single-ended or 16 differential analog inputs, 16-bit resolution, up to 250 kS/s aggregate sampling, 48 digital I/O lines, and two 32-bit counter/timers.
How many analog input channels does the PXI-6224 have?
The PXI-6224 provides up to 32 single-ended analog input channels or 16 differential analog input channels.
What is the analog input resolution of the PXI-6224?
The PXI-6224 provides 16-bit analog input resolution.
What is the maximum sampling rate of the PXI-6224?
The PXI-6224 provides a maximum analog input sampling rate of 250 kS/s aggregate. Because it uses a multiplexed architecture, this sampling rate is shared across enabled analog input channels rather than being available independently on every channel.
Does the PXI-6224 support simultaneous sampling?
No. The PXI-6224 uses a multiplexed analog input architecture. Applications requiring true simultaneous acquisition should use an appropriate simultaneous-sampling DAQ module.
Does the PXI-6224 have analog outputs?
No. The PXI-6224 does not provide analog output channels. If analog stimulus or waveform generation is required, another M Series multifunction DAQ model with analog outputs should be considered.
How many digital I/O lines does the PXI-6224 provide?
The PXI-6224 provides 48 digital I/O lines for device control, logic monitoring, test fixture operation, and hardware-timed digital applications.
Does the PXI-6224 support correlated digital I/O?
Yes. The PXI-6224 supports correlated digital I/O, allowing hardware-timed digital operations to be synchronized with other measurement tasks.
How many counter/timers does the PXI-6224 have?
The module provides two 32-bit general-purpose counter/timers for frequency, period, pulse-width, event-counting, pulse-generation, and encoder applications.
What software supports the PXI-6224?
The PXI-6224 uses NI-DAQmx and can be integrated with compatible LabVIEW, NI MAX, TestStand, C/C++, and .NET measurement applications.
What is the difference between PXI-6224 and PXI-6225?
Both belong to the NI M Series multifunction DAQ family, but the PXI-6225 is designed for applications requiring a substantially larger analog input channel count. The PXI-6224 is suitable when 32 single-ended or 16 differential analog inputs are sufficient.
What is the difference between PXI-6224 and PXI-6259?
The PXI-6224 provides 32 analog inputs with 250 kS/s maximum aggregate acquisition and does not include analog outputs. The PXI-6259 provides the same basic 32-channel analog input count but offers substantially higher analog acquisition speed and four analog outputs, making it more suitable for higher-performance multifunction testing.
What is the difference between PXI-6224 and PXI-6284?
The PXI-6224 is a general-purpose 16-bit M Series DAQ module, while the PXI-6284 is a high-accuracy M Series module with 18-bit analog input resolution. The PXI-6224 is suitable for standard data acquisition and monitoring, while the PXI-6284 is better suited to applications where higher measurement resolution is required.
What is the difference between PXI-6224 and PXI-6143?
The PXI-6224 provides a higher analog input channel count using multiplexed acquisition. The PXI-6143 provides fewer analog input channels but uses simultaneous sampling. Choose the PXI-6224 for general-purpose high-channel-count acquisition and the PXI-6143 when channel-to-channel timing correlation is critical.
What applications are suitable for the PXI-6224?
Typical applications include general-purpose data acquisition, multi-channel voltage monitoring, data logging, laboratory experiments, automated functional testing, electronic design verification, industrial monitoring, test fixture control, and manufacturing test.
What should I check before purchasing a PXI-6224?
Before purchasing a PXI-6224, verify the exact model and part number, PXI chassis compatibility, analog input configuration, required sampling rate, connector and cabling requirements, digital I/O requirements, and NI-DAQmx software compatibility.
Conclusion
The NI PXI-6224 Multifunction I/O Module provides 32 single-ended or 16 differential analog inputs, 16-bit resolution, up to 250 kS/s aggregate sampling, 48 digital I/O lines, two 32-bit counter/timers, correlated digital I/O, hardware triggering, and NI-DAQmx integration. Its combination of high analog input channel count and extensive digital resources makes the PXI-6224 a practical solution for general-purpose data acquisition, data logging, automated functional testing, laboratory measurement, design verification, and monitoring applications.
