Product Introduction
Земля NI PCI-6238 является isolated M Series multifunction data acquisition (DAQ) device designed for PCI-based industrial measurement, monitoring, control, and automated test systems. It combines isolated analog input, digital input/output, counters/timers, hardware timing, and triggering functions in a single PCI DAQ board.
The PCI-6238 provides up to 8 single-ended or 4 differential analog input channels с 16-битное разрешение and a maximum sampling rate of 250 kS/s. It also provides 6 digital input lines, 4 digital output lines, and two 32-bit counters/timers.
A key feature of the PCI-6238 is its bank-isolated I/O architecture. Isolation helps reduce problems caused by ground loops, ground-potential differences, electrical noise, and transient disturbances, making the PCI-6238 particularly suitable for industrial equipment, machine monitoring, production testing, and other electrically demanding measurement environments.
Product Overview
Земля National Instruments PCI-6238 is designed for applications requiring isolated analog measurement together with digital monitoring, digital control, and counter/timer functionality.
A typical PCI-6238 measurement architecture is:
Sensors / Voltage Signals → PCI-6238 → PCI Bus → Host Computer → NI-DAQmx / LabVIEW
Digital sensors, switches, equipment status signals, and compatible external control devices can also be connected to the digital I/O resources of the PCI-6238.
Key Features
8 Analog Input Channels
The PCI-6238 provides up to 8 single-ended analog input channels for acquiring voltage signals from sensors, transducers, electronic circuits, industrial equipment, and other compatible measurement sources.
The device can also be configured for up to 4 differential analog input channels.
16-Bit Analog Input Resolution
The PCI-6238 provides 16-bit analog input resolution, offering detailed voltage measurement capability for industrial monitoring, automated test, and laboratory applications.
The appropriate input range should be selected according to the expected signal amplitude to make effective use of the available measurement resolution.
Up to 250 kS/s Sampling
The PCI-6238 provides analog input sampling rates up to 250 kS/s, making it suitable for many industrial measurement, data logging, device validation, and automated test applications.
Actual system performance depends on channel configuration, acquisition mode, software, host computer performance, and overall measurement architecture.
Programmable Analog Input Ranges
The PCI-6238 supports multiple analog input ranges for measuring signals at different voltage levels.
Available ranges include:
- ±0.2 V
- ±1 V
- ±5 V
- ±10 V
Selecting a range that closely matches the expected signal level can improve effective measurement resolution.
6 Digital Input Lines
The PCI-6238 provides 6 digital input lines for monitoring compatible digital signals.
Типичные применения включают:
- Equipment status monitoring
- Limit switch detection
- Machine-state monitoring
- External event detection
- Digital sensor monitoring
- Automated test status inputs
4 Digital Output Lines
The PCI-6238 provides 4 digital output lines for controlling compatible external devices and logic circuits.
Digital outputs can be used for:
- External logic control
- Test sequencing
- Status indicators
- Equipment control signals
- Relay control through appropriate interface circuitry
- Automated test control
Isolated I/O Architecture
Electrical isolation is one of the primary reasons to select the PCI-6238 instead of a conventional nonisolated multifunction DAQ device.
Isolation can help reduce measurement and system problems associated with:
- Ground loops
- Ground-potential differences
- Industrial electrical noise
- Transient disturbances
- Interference from machinery
- Multiple interconnected powered systems
Two 32-Bit Counters/Timers
The PCI-6238 provides two 32-bit counters/timers for timing and digital measurement applications.
Typical counter/timer applications include:
- Подсчет событий
- Frequency measurement
- Period measurement
- Pulse-width measurement
- Encoder measurement
- Генерация импульсов
- Digital timing
PCI Host Interface
The PCI-6238 installs directly into a compatible conventional PCI slot in a desktop, industrial, or rackmount computer.
This makes it particularly relevant for maintaining existing automated test and industrial measurement systems that continue to use PCI-based computers.
NI-DAQmx Support
The PCI-6238 is supported through the НИ-DAQmx driver architecture for device configuration, data acquisition, digital I/O, counters/timers, hardware timing, and triggering.
It can be integrated into LabVIEW and other compatible application development environments.
Technical Specifications
| Параметр | Спецификация |
|---|---|
| Product Type | Isolated M Series Multifunction DAQ Device |
| Модель | PCI-6238 |
| Manufacturer | Национальные инструменты |
| Шинный интерфейс | PCI |
| Analog Input Channels | 8 Single-Ended / 4 Differential |
| Analog Input Resolution | 16-Bit |
| Maximum Analog Input Sample Rate | 250 kS/s |
| Analog Input Type | Voltage |
| Input Coupling | DC |
| Analog Input Ranges | ±0.2 V, ±1 V, ±5 V, ±10 V |
| Analog Output | No |
| Digital Inputs | 6 |
| Digital Outputs | 4 |
| Counters/Timers | 2 |
| Counter Resolution | 32-Bit |
| Изоляция | Bank Isolation |
| I/O Connector | 37-контактный D-SUB |
| Driver | НИ-DAQmx |
| Product Family | NI M Series Isolated DAQ |
| Primary Applications | Industrial Measurement, Monitoring, Automated Test and Control |
How Does the PCI-6238 Work?
The PCI-6238 provides an isolated interface between external analog and digital signals and the PCI bus of the host computer.
A simplified analog measurement path is:
Sensor / Voltage Signal → Isolated Input Circuitry → Multiplexer → 16-Bit ADC → PCI-6238 → PCI Bus → Host Application
The host application can simultaneously coordinate analog acquisition, digital input monitoring, digital output control, and counter/timer operations according to the requirements of the measurement system.
What Is an Isolated DAQ Device?
An isolated DAQ device provides electrical separation between portions of the external I/O circuitry and the computer-side measurement system.
This is particularly useful when signals originate from equipment that does not share the same electrical ground as the host computer.
Isolation can help improve measurement-system robustness in applications involving:
- Промышленное оборудование
- Production equipment
- Motors and drives
- Power electronics
- Remote sensors
- Автоматизированное испытательное оборудование
- Автоматизация производства
Why Use Bank Isolation?
Ground-potential differences can create unwanted current paths when measurement equipment and external devices are directly connected.
These ground loops can introduce measurement errors, electrical noise, and other system problems.
The bank-isolated architecture of the PCI-6238 makes it better suited than many conventional nonisolated DAQ devices for industrial environments where electrical separation is important.
Analog Input Measurement
The PCI-6238 can acquire voltage signals from compatible sensors, transducers, test points, and industrial equipment.
The analog input architecture can be configured according to the required channel count and measurement method.
Single-Ended Measurements
Single-ended configuration provides up to 8 аналоговых входных каналов and is useful when maximum channel count is required and the signal grounding architecture is appropriate.
Differential Measurements
Differential configuration provides up to 4 analog input channels.
Differential measurement can provide improved rejection of common-mode interference and may be preferred in electrically noisy measurement environments.
Sensor Measurement
The PCI-6238 can acquire compatible voltage-output sensors directly or measure sensors through appropriate external signal-conditioning hardware.
Applications can include:
- Pressure monitoring
- Position measurement
- Force measurement
- Process sensor acquisition
- Voltage monitoring
- Industrial equipment monitoring
Sensors requiring excitation, amplification, filtering, current measurement, bridge completion, or specialized conditioning require appropriate external circuitry or signal-conditioning hardware.
Industrial Data Acquisition
The PCI-6238 is particularly suitable for industrial data acquisition systems where isolation is more important than analog output functionality.
Typical industrial applications include:
- Machine monitoring
- Process monitoring
- Production-line measurement
- Equipment status acquisition
- Industrial sensor monitoring
- Factory test systems
- Electromechanical equipment testing
Machine Monitoring
Industrial machines can generate electrical noise from motors, relays, contactors, variable-frequency drives, and switching power electronics.
The isolated architecture of the PCI-6238 makes it useful for compatible machine monitoring systems where analog measurements and digital status signals must be acquired by a computer.
Автоматизированные испытательные системы
The PCI-6238 can be incorporated into automated test systems that require isolated voltage measurement, digital control, and timing functions.
A typical test sequence can:
- Configure analog input channels.
- Configure digital inputs and outputs.
- Initialize counters/timers.
- Control the device under test through digital outputs.
- Acquire analog measurements.
- Monitor digital status signals.
- Perform timing or frequency measurements.
- Evaluate pass/fail limits.
- Store the test results.
Production Test
Production test stations can use the PCI-6238 for isolated measurement and digital control operations.
Its combination of analog input, digital I/O, counters, hardware timing, and isolation makes it suitable for functional testing of industrial and electronic products.
Motor and Drive Testing
Motors, drives, actuators, and electromechanical systems often operate in electrically noisy environments.
The PCI-6238 can acquire compatible voltage and digital signals in motor and drive test applications, provided that all signals remain within the specified input and isolation limits of the device.
Power Electronics Testing
Power electronics applications can involve significant ground-potential differences and switching noise.
The isolated architecture of the PCI-6238 can be useful for compatible low-level measurement and control signals in power electronics test systems.
The PCI-6238 should not be connected directly to signals that exceed its specified input, common-mode, working-voltage, or isolation limits. Appropriate probes, attenuation, isolation, or signal conditioning must be used when required.
PCI-6238 vs PCI-6230
The PCI-6238 and PCI-6230 are closely related isolated M Series DAQ devices, but they target different I/O requirements.
| Функция | PCI-6238 | PCI-6230 |
|---|---|---|
| Bus | PCI | PCI |
| Analog Inputs | 8 SE / 4 Differential | 8 SE / 4 Differential |
| AI Resolution | 16-Bit | 16-Bit |
| Maximum AI Sample Rate | 250 kS/s | 250 kS/s |
| Analog Outputs | No | 4 |
| Digital Inputs | 6 | 6 |
| Digital Outputs | 4 | 4 |
| Counters/Timers | 2 | 2 |
| Изоляция | Bank Isolation | Bank Isolation |
| Best For | Isolated Acquisition and Digital I/O | Isolated Acquisition with Analog Generation |
The most important purchasing distinction is the analog output requirement. Choose the PCI-6230 when analog outputs are required. The PCI-6238 is more appropriate when the system primarily requires isolated analog acquisition and digital I/O.
PCI-6238 vs PXI-6238
The PCI-6238 and PXI-6238 provide closely related isolated M Series measurement capabilities but use different system platforms.
| Функция | PCI-6238 | PXI-6238 |
|---|---|---|
| Platform | PCI | PXI |
| Analog Inputs | 8 SE / 4 Differential | 8 SE / 4 Differential |
| AI Resolution | 16-Bit | 16-Bit |
| Maximum AI Sample Rate | 250 kS/s | 250 kS/s |
| Цифровой ввод-вывод | 6 DI / 4 DO | 6 DI / 4 DO |
| Изоляция | Bank Isolation | Bank Isolation |
| Installation | PCI Computer | PXI Шасси |
| Best Application | PC-Based Systems | Modular PXI Test Systems |
PCI-6238 vs Nonisolated DAQ
| Функция | PCI-6238 | Typical Nonisolated DAQ |
|---|---|---|
| Изоляция | Bank Isolated | Typically Nonisolated |
| Analog Input | Да | Да |
| Цифровой ввод-вывод | Да | Model Dependent |
| Counters/Timers | Да | Model Dependent |
| Industrial Ground Differences | Better Suited | Requires Careful Grounding |
| Primary Application | Industrial / Isolated Measurement | General-Purpose DAQ |
PCI-6238 vs PCI-6281
The PCI-6238 and PCI-6281 are designed for different measurement priorities.
| Функция | PCI-6238 | PCI-6281 |
|---|---|---|
| DAQ Family | Isolated M Series | High-Accuracy M Series |
| AI Resolution | 16-Bit | 18-Bit |
| Maximum AI Sample Rate | 250 kS/s | 625 kS/s |
| Maximum AI Channels | 8 | 16 |
| Изоляция | Bank Isolation | Nonisolated |
| Primary Strength | Isolated Industrial Measurement | High-Accuracy General Measurement |
Choose the PCI-6238 when isolation and industrial signal acquisition are primary requirements. Choose the PCI-6281 when higher resolution, higher acquisition performance, and additional analog channels are more important.
37-Pin D-SUB Connectivity
The PCI-6238 uses a 37-pin D-SUB I/O connector.
Compatible cables and terminal blocks provide convenient access to the analog input, digital I/O, counter, and timing signals.
Before purchasing an accessory, verify the exact connector, pinout, cable, terminal block, shielding, and application requirements for the PCI-6238.
Signal Conditioning
The PCI-6238 measures compatible voltage signals directly, but many sensors require additional signal conditioning.
Depending on the application, signal conditioning may provide:
- Amplification
- Filtering
- Additional isolation
- Sensor excitation
- Voltage attenuation
- Current-to-voltage conversion
- Bridge completion
Signal-conditioning hardware should be selected according to the sensor type and electrical characteristics of the measurement.
NI-DAQmx Software
The PCI-6238 uses НИ-DAQmx for hardware configuration and application development.
NI-DAQmx provides functionality for:
- Device configuration
- Analog input acquisition
- Digital input
- Digital output
- Counter/timer operations
- Timing configuration
- Hardware triggering
- Device diagnostics
- Calibration information
LabVIEW Integration
The PCI-6238 can be integrated into LabVIEW measurement and automated test applications using compatible NI-DAQmx software.
A typical application workflow is:
Configure Channels → Configure Timing → Configure Trigger → Start Acquisition → Read Data → Analyze → Log Results
Legacy System Replacement
The PCI-6238 remains particularly relevant for maintenance of existing NI measurement and automated test systems based on conventional PCI computers.
When replacing an existing PCI-6238, verify:
- PCI slot compatibility
- 37-pin connector requirements
- Existing cable compatibility
- Terminal block compatibility
- Analog input configuration
- Digital I/O requirements
- Counter/timer usage
- Isolation requirements
- NI-DAQmx version
- Operating system compatibility
- LabVIEW version
- Existing application source code
How to Choose an Isolated DAQ Device
Before selecting the PCI-6238, evaluate:
- Required isolation architecture
- Analog input channel count
- Single-ended or differential measurement requirements
- Analog input resolution
- Required sampling rate
- Input voltage ranges
- Whether analog output is required
- Digital input requirements
- Digital output requirements
- Counter/timer requirements
- PCI slot availability
- Connector and cable requirements
- Signal-conditioning requirements
- NI-DAQmx compatibility
- Operating system compatibility
Industries
- Промышленная автоматизация
- Automated Test
- Manufacturing Test
- Machine Monitoring
- Electronic Validation
- Power Electronics
- Motor and Drive Testing
- Laboratory Automation
- Research and Development
- Production Test
Applications
Industrial Voltage Measurement
The PCI-6238 can acquire compatible voltage signals from industrial equipment where isolated measurement is required.
Machine Monitoring
Analog inputs and digital I/O can be used to monitor machine signals, equipment states, sensors, and production processes.
Automated Test
The PCI-6238 can combine isolated analog acquisition, digital control, digital monitoring, counters, timing, and triggering in automated test systems.
Production Test
The device can be incorporated into production test stations requiring isolated measurement and digital interaction with the device under test.
Motor and Drive Test
The isolated architecture can be useful in compatible motor, actuator, and drive testing applications where electrical noise and ground differences must be considered.
Legacy Test System Maintenance
The PCI-6238 can be used to maintain existing PCI-based NI measurement systems where compatibility with established hardware, cabling, drivers, and application software is important.
Recommended Related Products
| PCI-6238 | Isolated PCI M Series DAQ for analog acquisition, digital I/O, counters, and industrial measurement. |
| PXI-6238 | PXI version for modular systems requiring similar isolated measurement and digital I/O capabilities. |
| PCI-6230 | Related isolated M Series PCI DAQ with four analog outputs for applications requiring both acquisition and analog generation. |
| PCI-6232 | Related isolated M Series DAQ option for industrial measurement and control applications. |
| PCI-6233 | Related isolated multifunction DAQ device for applications requiring a different I/O configuration. |
| PCI-6281 | 18-bit high-accuracy M Series PCI DAQ for applications prioritizing measurement resolution and acquisition performance. |
Why Choose PCI-6238?
- Isolated M Series architecture
- 8 single-ended analog inputs
- 4 differential analog inputs
- 16-bit analog input resolution
- Up to 250 kS/s sampling
- Multiple programmable input ranges
- 6 digital input lines
- 4 digital output lines
- Two 32-bit counters/timers
- Bank isolation
- 37-pin D-SUB connector
- PCI host interface
- NI-DAQmx support
- Интеграция LabVIEW
- Suitable for industrial measurement
- Suitable for automated testing
- Suitable for legacy PCI system maintenance
Frequently Asked Questions
What is the NI PCI-6238?
The NI PCI-6238 is an isolated M Series multifunction PCI DAQ device designed for analog voltage acquisition, digital I/O, counter/timer measurements, industrial monitoring, and automated testing.
How many analog input channels does PCI-6238 have?
The PCI-6238 provides up to 8 single-ended or 4 differential analog input channels.
What is the analog input resolution of PCI-6238?
The PCI-6238 provides 16-bit analog input resolution.
What is the maximum sample rate of PCI-6238?
The PCI-6238 supports analog input sampling rates up to 250 kS/s.
What analog input ranges does PCI-6238 support?
The PCI-6238 supports programmable input ranges including ±0.2 V, ±1 V, ±5 V, and ±10 V.
Does PCI-6238 have analog outputs?
No. The PCI-6238 does not provide analog output channels. If analog generation is required in a closely related isolated M Series architecture, the PCI-6230 should be evaluated.
How many digital inputs does PCI-6238 have?
The PCI-6238 provides 6 digital input lines.
How many digital outputs does PCI-6238 have?
The PCI-6238 provides 4 digital output lines.
Is PCI-6238 isolated?
Yes. The PCI-6238 uses a bank-isolated I/O architecture, making isolation one of the primary characteristics of this model.
How many counters does PCI-6238 have?
The PCI-6238 provides two 32-bit counters/timers.
What connector does PCI-6238 use?
The PCI-6238 uses a 37-pin D-SUB I/O connector. The appropriate compatible cable and terminal block should be selected according to the application.
What driver does PCI-6238 use?
The PCI-6238 uses НИ-DAQmx for hardware configuration, data acquisition, digital I/O, counters/timers, timing, and triggering.
Can PCI-6238 be used with LabVIEW?
Yes. The PCI-6238 can be integrated into LabVIEW-based data acquisition, industrial monitoring, and automated test applications using compatible NI-DAQmx software.
What is the difference between PCI-6238 and PCI-6230?
The devices provide closely related isolated analog input and digital I/O functionality. The major difference is that the PCI-6230 additionally provides four analog output channels, while the PCI-6238 does not provide analog outputs.
What is the difference between PCI-6238 and PXI-6238?
The main difference is the system platform. PCI-6238 installs in a conventional PCI computer, while PXI-6238 installs in a PXI chassis. They provide closely related isolated M Series measurement capabilities.
Is PCI-6238 suitable for industrial measurement?
Yes. Its bank-isolated architecture makes the PCI-6238 particularly suitable for industrial monitoring and automated test applications where electrical noise or ground-potential differences may be present.
Can PCI-6238 directly measure high-voltage power signals?
The PCI-6238 must only be used within its specified input, common-mode, working-voltage, and isolation limits. Higher-voltage signals require appropriate attenuation, probes, external isolation, or signal-conditioning hardware.
What should I check before purchasing a PCI-6238?
Verify the required analog input channel count, 16-bit resolution, 250 kS/s sampling rate, voltage ranges, isolation requirements, digital I/O, counters, PCI interface, 37-pin cabling and terminal block, NI-DAQmx compatibility, operating system, and existing application software.
Заключение
Земля NI PCI-6238 Isolated M Series Multifunction DAQ combines 16-bit, 250 kS/s analog acquisition with up to 8 single-ended or 4 differential analog inputs, six digital inputs, four digital outputs, two 32-bit counters/timers, and bank isolation. Its isolated architecture makes it particularly suitable for industrial measurement, machine monitoring, automated test, production testing, electronic validation, and maintenance of existing PCI-based NI data acquisition systems.
