Product Introduction
Земля NI PXI-6122 is a 4-channel simultaneous-sampling PXI multifunction data acquisition module designed for applications requiring precise time correlation between multiple analog signals.
The PXI-6122 provides 4 differential analog input channels, 16-битное разрешение, and sampling rates up to 500 kS/s per channel. Its simultaneous-sampling architecture allows all four analog input channels to acquire signals at the same instant, eliminating the interchannel timing delay associated with conventional multiplexed DAQ devices.
In addition to analog acquisition, the PXI-6122 provides 8 bidirectional digital I/O lines, two 24-bit counter/timers, digital triggering, analog triggering, and PXI synchronization resources. Typical applications include IF digitization, transient recording, telecommunications manufacturing test, ultrasound and sonar testing, high-energy physics, and automated measurement systems.
Product Overview
Земля National Instruments PXI-6122 belongs to the NI S Series simultaneous-sampling multifunction DAQ family.
Unlike multiplexed DAQ devices that sequentially connect several input channels to a shared ADC, the PXI-6122 uses a simultaneous-sampling architecture. This allows all four analog input channels to maintain accurate timing relationships during acquisition.
With 500 kS/s sampling capability on every analog input channel, the PXI-6122 is particularly useful for transient measurements, phase-related signal acquisition, synchronized sensor measurements, and other applications where channel-to-channel timing accuracy is important.
Key Features
4 Simultaneously Sampled Analog Inputs
The PXI-6122 provides four differential analog input channels with true simultaneous-sampling capability.
- 4 differential analog input channels
- Simultaneous acquisition
- 16-bit ADC resolution
- Accurate channel-to-channel timing
- Suitable for phase-related measurements
- Designed for dynamic and transient signals
Advantage: All four analog channels can be sampled at the same time, avoiding the interchannel delay produced by multiplexed DAQ architectures.
500 kS/s Per Channel Sampling
Each PXI-6122 analog input channel supports sampling rates up to 500 kS/s.
- 500 kS/s maximum sampling rate per channel
- Full-rate simultaneous acquisition
- Up to 2 MS/s aggregate acquisition across four channels
- Hardware-timed sampling
- Continuous waveform acquisition
Advantage: Because the sampling specification applies per channel, enabling multiple analog inputs does not require sequential channel scanning as it would on a multiplexed DAQ device.
16-Bit Analog Input Resolution
The PXI-6122 uses 16-bit analog-to-digital conversion for accurate waveform acquisition.
- 16-bit ADC resolution
- 65,536 quantization levels
- Dynamic waveform acquisition
- Transient measurements
- Laboratory testing
Simultaneous Sampling Architecture
Simultaneous sampling is the primary technical advantage of the PXI-6122.
A conventional multiplexed multifunction DAQ device typically uses one ADC that sequentially samples several analog input channels. This creates a small time difference between samples acquired from different channels.
The PXI-6122 acquires its four analog channels simultaneously, preserving the timing relationship between signals.
- No sequential multiplexing between AI channels
- Improved channel-to-channel timing
- Accurate transient capture
- Suitable for synchronized waveform measurements
- Useful for phase-related signal analysis
8 Bidirectional Digital I/O Lines
The PXI-6122 provides eight bidirectional digital I/O lines for external device control and monitoring.
- 8 bidirectional digital channels
- Digital input
- Digital output
- External device control
- Logic-state monitoring
- Automated test fixture integration
Two 24-Bit Counter/Timers
The PXI-6122 provides two general-purpose 24-bit counter/timers for timing and pulse measurements.
- 2 counter/timers
- 24-bit resolution
- Frequency measurement
- Period measurement
- Pulse-width measurement
- Подсчет событий
- Генерация импульсов
Advantage: Integrated counters provide additional timing and measurement capabilities without requiring a dedicated counter/timer module.
Analog Triggering
The PXI-6122 provides analog triggering for event-based waveform acquisition.
- Analog trigger source from analog input channels
- Positive or negative trigger slope
- Programmable hysteresis
- Event-based acquisition
- Transient signal capture
Advantage: Analog triggering allows the module to capture waveforms based on the characteristics of the measured analog signal.
Digital Triggering
Digital hardware triggering provides deterministic acquisition based on external digital events.
- TTL-compatible digital triggering
- Rising-edge triggering
- Falling-edge triggering
- External event synchronization
- Hardware-controlled acquisition
PXI Trigger Bus Support
The PXI-6122 can use PXI timing and triggering resources for synchronization with other instruments in a modular test system.
- 7 PXI trigger lines
- PXI Star Trigger
- Multi-instrument synchronization
- Hardware event routing
- Automated PXI test integration
68-Pin SCSI Connector
The PXI-6122 uses a 68-pin SCSI-type connector for analog input, digital I/O, counter, and trigger signals.
- 68-pin SCSI connector
- High-density signal connectivity
- Compatible NI cabling and terminal accessories
- Test fixture integration
NI-DAQmx Software Support
The PXI-6122 operates with NI-DAQmx for hardware configuration, acquisition, triggering, digital I/O, and counter/timer applications.
- НИ-DAQmx
- Интеграция LabVIEW
- NI MAX configuration
- TestStand integration
- C/C++ APIs
- .NET application development
Technical Specifications
| Параметр | Описание |
|---|---|
| Product Type | PXI Simultaneous-Sampling Multifunction I/O Module |
| Модель | NI PXI-6122 |
| Part Number | 779179-01 |
| Product Family | NI S Series / 61xx Simultaneous Sampling Multifunction I/O |
| Шинный интерфейс | PXI |
| Analog Inputs | 4 Differential |
| Single-Ended Analog Inputs | 0 |
| Sampling Architecture | Simultaneous Sampling |
| Analog Input Resolution | 16 Bit |
| Maximum Sample Rate | 500 kS/s Per Channel |
| Maximum Aggregate Acquisition Rate | 2 MS/s Across 4 Channels |
| Цифровой ввод-вывод | 8 Bidirectional Lines |
| Counter/Timers | 2 |
| Counter Resolution | 24 Bit |
| Analog Trigger | Supported |
| Digital Trigger | TTL Compatible |
| PXI Trigger Lines | 7 |
| PXI Star Trigger | 1 |
| I/O Connector | 68-Pin Male SCSI-II Type |
| Operating Temperature | 0 °C to 50 °C |
| Storage Temperature | -20 °C to 70 °C |
| Driver | НИ-DAQmx |
| Product Status | Limited Support / No Longer Available for Purchase |
| Primary Applications | IF Digitization, Transient Recording, Telecom Test, Ultrasound, Sonar and High-Energy Physics |
Simultaneous Sampling Explained
The most important characteristic of the PXI-6122 is its simultaneous-sampling architecture.
In a multiplexed DAQ module, several analog input channels share one ADC. The module switches from one input channel to another before each conversion, creating a small time offset between samples.
The PXI-6122 is designed differently. Its four analog input channels can be digitized simultaneously, allowing the system to maintain accurate time correlation between multiple waveforms.
This architecture is especially valuable for transient measurements, phase comparisons, ultrasonic signals, sonar systems, and other applications where timing relationships between channels must be preserved.
Analog Input Performance
The PXI-6122 provides four differential analog inputs with 16-bit resolution and sampling rates up to 500 kS/s on each channel.
Because all four channels can operate simultaneously at the maximum sampling rate, the module can acquire an aggregate of up to approximately 2 million analog samples per second.
This differs fundamentally from multiplexed DAQ modules where the specified maximum sampling rate may be shared across multiple enabled channels.
PXI Timing and Triggering
The PXI-6122 supports PXI timing and triggering resources for coordinating measurements with other modules in an automated test system.
The module provides access to seven PXI trigger lines and the PXI Star Trigger, allowing acquisition events to be coordinated with compatible PXI instruments.
This capability is useful in systems combining data acquisition with oscilloscopes, signal generators, switching modules, digital instruments, or other synchronized measurement hardware.
Software Ecosystem
The NI PXI-6122 is supported by the NI-DAQmx software ecosystem for measurement, timing, triggering, digital control, and automated testing.
- NI-DAQmx: Provides APIs for analog acquisition, digital I/O, counters, triggering, and timing.
- LabVIEW: Enables development of customized data acquisition, analysis, monitoring, and automated test applications.
- NI MAX: Provides device configuration, hardware discovery, self-test, and basic measurement functionality.
- TestStand: Allows PXI-6122 acquisition and control operations to be integrated into automated validation and manufacturing test sequences.
- C/C++ and .NET: Support customized DAQ applications through compatible NI-DAQmx APIs.
Industries
- Telecommunications
- Аэрокосмическая и оборонная промышленность
- Ultrasonic Testing
- Sonar Research
- High-Energy Physics
- Electronic Manufacturing
- Исследовательские лаборатории
- Automated Test Equipment
Applications
IF Digitization
The PXI-6122 can digitize multiple intermediate-frequency signals while maintaining accurate timing relationships between channels.
- IF signal acquisition
- Synchronized waveform capture
- Signal characterization
- Automated communication testing
Transient Recording
The simultaneous-sampling architecture makes the PXI-6122 suitable for capturing transient events occurring across several analog channels.
- Transient waveform acquisition
- Event recording
- Impact measurements
- Dynamic signal capture
Telecommunications Manufacturing Test
NI identifies telecommunications manufacturing test as one of the primary application areas for the PXI-6122.
- ISDN testing
- ADSL testing
- POTS testing
- Automated telecommunications validation
- Production test systems
Ultrasound Testing
The PXI-6122 can acquire multiple ultrasound-related signals simultaneously for development and validation applications.
- Ultrasound waveform acquisition
- Time-correlated measurements
- Multiple sensor acquisition
- Research and validation
Sonar Testing
The four simultaneous analog inputs can be used for synchronized sonar signal acquisition.
- Sonar waveform recording
- Multichannel acquisition
- Phase-related analysis
- Time-domain measurements
High-Energy Physics
The PXI-6122 is suitable for research applications requiring synchronized acquisition of transient analog signals.
PXI-6122 vs Multiplexed Multifunction DAQ
| Функция | PXI-6122 | Typical Multiplexed DAQ |
|---|---|---|
| Analog Input Architecture | Simultaneous Sampling | Multiplexed |
| Analog Input Channels | 4 Differential | Varies |
| Sampling | 500 kS/s Per Channel | Usually Shared Across Channels |
| Channel Timing | Синхронный | Sequential |
| Best Application | Time-Correlated Dynamic Signals | General-Purpose Data Acquisition |
| Типичное использование | Transient, IF, Ultrasound and Sonar | Monitoring, Logging and General Measurement |
Comparison with Similar NI Simultaneous Sampling Modules
| Модель | Основное различие | Best Application |
|---|---|---|
| NI PXI-6122 | 4 differential AI, 16-bit resolution and 500 kS/s simultaneous sampling per channel. | Moderate-speed synchronized 4-channel acquisition |
| NI PXI-6123 | Related S Series model providing eight simultaneous analog input channels. | Applications requiring more simultaneous AI channels |
| NI PXI-6133 | Higher-speed simultaneous-sampling DAQ designed for significantly faster transient acquisition. | High-speed synchronized waveform measurements |
| NI PXI-6143 | Eight-channel simultaneous-sampling module with 250 kS/s per-channel acquisition. | Higher channel count with moderate sampling speed |
| NI PXIe-6124 | PXI Express simultaneous-sampling multifunction I/O module for newer PXIe platforms. | Newer PXI Express synchronized DAQ systems |
Recommended Related Products
| NI PXI-6123 | Related S Series PXI module for applications requiring eight simultaneous analog input channels. |
| NI PXI-6133 | Higher-speed simultaneous-sampling module for faster transient and dynamic waveform acquisition. |
| NI PXI-6143 | Eight-channel simultaneous-sampling PXI module for applications prioritizing channel count over maximum sampling speed. |
Why Choose NI PXI-6122?
- 4 differential analog input channels
- True simultaneous sampling
- 16-bit analog input resolution
- 500 kS/s sampling per channel
- Up to 2 MS/s aggregate acquisition
- 8 bidirectional digital I/O lines
- 2 × 24-bit counter/timers
- Analog triggering
- TTL-compatible digital triggering
- 7 PXI trigger lines
- PXI Star Trigger support
- 68-pin SCSI connectivity
- NI-DAQmx software support
- Suitable for IF and transient acquisition
- Designed for time-correlated multichannel measurements
Frequently Asked Questions
What is the NI PXI-6122?
The NI PXI-6122 is a four-channel simultaneous-sampling PXI multifunction DAQ module providing 16-bit resolution, sampling rates up to 500 kS/s per channel, eight bidirectional digital I/O lines, two 24-bit counter/timers, and hardware triggering.
What is the part number of the PXI-6122?
The NI PXI-6122 part number is 779179-01.
How many analog inputs does the PXI-6122 have?
The PXI-6122 provides four differential analog input channels. It does not provide configurable single-ended analog input channels.
Does the PXI-6122 support simultaneous sampling?
Yes. All four analog input channels can be sampled simultaneously, which helps preserve the timing and phase relationship between acquired signals.
What is the maximum sampling rate of the PXI-6122?
The PXI-6122 supports a maximum sampling rate of 500 kS/s per analog input channel.
What is the resolution of the PXI-6122?
The PXI-6122 provides 16-bit analog input resolution.
How many digital I/O channels does the PXI-6122 provide?
The PXI-6122 provides eight bidirectional digital I/O channels.
Does the PXI-6122 have counters?
Yes. The module provides two 24-bit general-purpose counter/timers for frequency, period, pulse-width, event-counting, and pulse-generation applications.
Does the PXI-6122 support analog triggering?
Yes. The PXI-6122 provides analog triggering using the analog input channels as trigger sources, with programmable trigger level, slope, and hysteresis.
What connector does the PXI-6122 use?
The PXI-6122 uses a 68-pin male SCSI-II type I/O connector. Compatible cables and terminal blocks should be selected according to the application and required signal connections.
What is the difference between PXI-6122 and PXI-6123?
Both are S Series simultaneous-sampling multifunction DAQ modules. The PXI-6122 provides four analog input channels, while the PXI-6123 provides eight analog input channels. The PXI-6122 is suitable when four synchronized channels are sufficient, while the PXI-6123 is preferable when additional simultaneous analog inputs are required.
What is the difference between PXI-6122 and PXI-6143?
Both provide 16-bit simultaneous-sampling analog acquisition. The PXI-6122 provides four analog inputs at up to 500 kS/s per channel, while the PXI-6143 provides eight analog inputs at up to 250 kS/s per channel. The choice therefore depends primarily on whether the application prioritizes higher per-channel sampling speed or additional simultaneous channels.
What applications is the PXI-6122 designed for?
Typical PXI-6122 applications include IF digitization, transient recording, ISDN, ADSL and POTS manufacturing test, ultrasound and sonar testing, high-energy physics, synchronized signal acquisition, and automated measurement systems.
Is the NI PXI-6122 discontinued?
The PXI-6122 is no longer available for purchase directly from NI and is currently classified as a Limited Support product. It remains relevant for maintenance, replacement, and expansion of existing PXI systems that use S Series DAQ hardware.
What should I check before purchasing a replacement PXI-6122?
Before purchasing a replacement module, verify the exact model and part number, PXI chassis compatibility, 68-pin cable and terminal block requirements, NI-DAQmx software compatibility, and whether the application specifically depends on the PXI-6122 simultaneous-sampling architecture.
Заключение
Земля NI PXI-6122 Simultaneous-Sampling Multifunction I/O Module provides four differential analog inputs, 16-bit resolution, 500 kS/s per-channel sampling, eight bidirectional digital I/O lines, two 24-bit counter/timers, analog and digital triggering, and PXI synchronization capabilities. Its true simultaneous-sampling architecture makes it particularly suitable for IF digitization, transient recording, telecommunications testing, ultrasound, sonar, high-energy physics, and other applications where accurate timing relationships between multiple analog signals must be maintained.
