{"id":30168,"date":"2025-09-25T14:48:47","date_gmt":"2025-09-25T06:48:47","guid":{"rendered":"https:\/\/pxisource.com\/?post_type=product&#038;p=30168"},"modified":"2026-08-31T20:32:39","modified_gmt":"2026-08-31T12:32:39","slug":"pxi-6281","status":"publish","type":"product","link":"https:\/\/pxisource.com\/ru\/product\/pxi-6281\/","title":{"rendered":"PXI-6281"},"content":{"rendered":"<h3>PXI-6281 18-Bit 625 kS\/s Multifunction PXI DAQ Module<\/h3>\n<p>\u0417\u0435\u043c\u043b\u044f <strong>PXI-6281<\/strong> is a high-accuracy M Series PXI multifunction data acquisition module for laboratory automation, research, design validation and production testing. It combines precision analog input, analog output, digital I\/O, counter\/timer and triggering functions in a single 3U PXI module.<\/p>\n<p>The module provides 16 single-ended or eight differential analog inputs with 18-bit resolution. It supports a maximum single-channel sampling rate of 625 kS\/s and an aggregate multichannel rate of 500 kS\/s.<\/p>\n<p>The PXI-6281 also includes two 16-bit analog outputs, 24 digital I\/O lines and two 32-bit counter\/timers. Its combination of resolution, flexible input ranges and multifunction I\/O makes it suitable for precision voltage measurement and automated mixed-signal testing.<\/p>\n<h3>Key Features of the PXI-6281<\/h3>\n<ul>\n<li>16 single-ended analog input channels<\/li>\n<li>Eight differential analog input channels<\/li>\n<li>18-bit analog input resolution<\/li>\n<li>625 kS\/s maximum single-channel sampling rate<\/li>\n<li>500 kS\/s maximum aggregate multichannel rate<\/li>\n<li>Programmable input ranges from \u00b1100 mV to \u00b110 V<\/li>\n<li>Two 16-bit analog voltage outputs<\/li>\n<li>Up to 2.86 MS\/s analog output update rate<\/li>\n<li>24 TTL\/CMOS-compatible digital I\/O lines<\/li>\n<li>Hardware-timed correlated digital I\/O<\/li>\n<li>Two 32-bit general-purpose counter\/timers<\/li>\n<li>Analog and digital triggering<\/li>\n<li>Six DMA channels<\/li>\n<li>PXI trigger and clock synchronization<\/li>\n<li>One 68-pin VHDCI front-panel connector<\/li>\n<li>SCXI and SCC signal-conditioning compatibility<\/li>\n<li>NI-DAQmx software support<\/li>\n<\/ul>\n<h3>PXI-6281 Technical Specifications<\/h3>\n<table>\n<tbody>\n<tr>\n<th>Product Model<\/th>\n<td>PXI-6281<\/td>\n<\/tr>\n<tr>\n<th>Part Number<\/th>\n<td>779121-01<\/td>\n<\/tr>\n<tr>\n<th>Product Family<\/th>\n<td>NI M Series high-accuracy multifunction DAQ<\/td>\n<\/tr>\n<tr>\n<th>Product Type<\/th>\n<td>PXI multifunction I\/O module<\/td>\n<\/tr>\n<tr>\n<th>Single-Ended Analog Inputs<\/th>\n<td>16<\/td>\n<\/tr>\n<tr>\n<th>Differential Analog Inputs<\/th>\n<td>8<\/td>\n<\/tr>\n<tr>\n<th>ADC Resolution<\/th>\n<td>18 bits<\/td>\n<\/tr>\n<tr>\n<th>Maximum Single-Channel Sample Rate<\/th>\n<td>625 kS\/s<\/td>\n<\/tr>\n<tr>\n<th>Maximum Multichannel Sample Rate<\/th>\n<td>500 kS\/s aggregate<\/td>\n<\/tr>\n<tr>\n<th>Analog Input Sampling<\/th>\n<td>Multiplexed, nonsimultaneous<\/td>\n<\/tr>\n<tr>\n<th>Input Coupling<\/th>\n<td>DC<\/td>\n<\/tr>\n<tr>\n<th>Analog Input Ranges<\/th>\n<td>\u00b10.1 V, \u00b10.2 V, \u00b10.5 V, \u00b11 V, \u00b12 V, \u00b15 V and \u00b110 V<\/td>\n<\/tr>\n<tr>\n<th>Maximum Analog Input Level<\/th>\n<td>\u00b111 V relative to AI GND<\/td>\n<\/tr>\n<tr>\n<th>Analog Output Channels<\/th>\n<td>2 voltage outputs<\/td>\n<\/tr>\n<tr>\n<th>DAC Resolution<\/th>\n<td>16 bits<\/td>\n<\/tr>\n<tr>\n<th>Maximum Analog Output Update Rate<\/th>\n<td>2.86 MS\/s with one channel<\/td>\n<\/tr>\n<tr>\n<th>Analog Output Range<\/th>\n<td>\u00b110 V<\/td>\n<\/tr>\n<tr>\n<th>\u0426\u0438\u0444\u0440\u043e\u0432\u043e\u0439 \u0432\u0432\u043e\u0434-\u0432\u044b\u0432\u043e\u0434<\/th>\n<td>24 lines<\/td>\n<\/tr>\n<tr>\n<th>Hardware-Timed Digital I\/O<\/th>\n<td>8 lines on Port 0<\/td>\n<\/tr>\n<tr>\n<th>Maximum Digital Waveform Rate<\/th>\n<td>10 MHz, system dependent<\/td>\n<\/tr>\n<tr>\n<th>Counters\/Timers<\/th>\n<td>2 \u00d7 32-bit<\/td>\n<\/tr>\n<tr>\n<th>DMA Channels<\/th>\n<td>6<\/td>\n<\/tr>\n<tr>\n<th>\u0417\u0430\u043f\u0443\u0441\u043a<\/th>\n<td>Analog and digital<\/td>\n<\/tr>\n<tr>\n<th>PXI Synchronization<\/th>\n<td>PXI_TRIG, PXI_STAR and PXI_CLK10<\/td>\n<\/tr>\n<tr>\n<th>Front-Panel Connector<\/th>\n<td>1 \u00d7 68-pin VHDCI<\/td>\n<\/tr>\n<tr>\n<th>Module Format<\/th>\n<td>3U, single-slot PXI module<\/td>\n<\/tr>\n<tr>\n<th>\u0428\u0438\u043d\u043d\u044b\u0439 \u0438\u043d\u0442\u0435\u0440\u0444\u0435\u0439\u0441<\/th>\n<td>PXI hybrid compatible<\/td>\n<\/tr>\n<tr>\n<th>Software Driver<\/th>\n<td>\u041d\u0418-DAQmx<\/td>\n<\/tr>\n<tr>\n<th>NI Suggested Replacement<\/th>\n<td>PXIe-4309 for precision analog input applications<\/td>\n<\/tr>\n<tr>\n<th>Availability Status<\/th>\n<td>Discontinued by NI<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>PXI-6281 Part Number and Accessories<\/h3>\n<table>\n<tbody>\n<tr>\n<th>Item<\/th>\n<th>Part Number<\/th>\n<th>\u041e\u043f\u0438\u0441\u0430\u043d\u0438\u0435<\/th>\n<\/tr>\n<tr>\n<td>PXI-6281<\/td>\n<td>779121-01<\/td>\n<td>18-bit, 16-channel high-accuracy PXI multifunction DAQ module<\/td>\n<\/tr>\n<tr>\n<td>SHC68-68-EPM Cable<\/td>\n<td>Varies by length<\/td>\n<td>Shielded 68-pin VHDCI cable for connecting the module to a terminal accessory<\/td>\n<\/tr>\n<tr>\n<td>SCB-68A<\/td>\n<td>782536-01<\/td>\n<td>Shielded screw-terminal block for custom analog and digital wiring<\/td>\n<\/tr>\n<tr>\n<td>CB-68LP<\/td>\n<td>777145-01<\/td>\n<td>Low-profile 68-pin connector block with screw terminals<\/td>\n<\/tr>\n<tr>\n<td>BNC-2120<\/td>\n<td>779014-01<\/td>\n<td>Shielded BNC terminal accessory for laboratory signal connections<\/td>\n<\/tr>\n<tr>\n<td>PXIe-4309<\/td>\n<td>Verify current configuration<\/td>\n<td>NI-recommended precision PXI Express analog input replacement<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>The PXI-6281 uses one 68-pin VHDCI front-panel connector. Select the terminal block according to the required shielding, connector layout, signal type and fixture design.<\/p>\n<p>The selected cable must be compatible with VHDCI M Series DAQ hardware. Inspect the connector carefully before installation because the high-density pins can be damaged by misalignment or excessive force.<\/p>\n<h3>18-Bit High-Accuracy Analog Input<\/h3>\n<p>The PXI-6281 uses an 18-bit analog-to-digital converter to provide greater measurement resolution than conventional 16-bit multifunction DAQ modules.<\/p>\n<p>Across a nominal \u00b110 V range, the 20 V input span is represented by 262,144 ADC codes. Smaller programmable input ranges provide finer theoretical voltage increments for low-level signals.<\/p>\n<p>Actual accuracy also depends on gain error, offset error, noise, temperature, calibration and source impedance. ADC resolution should therefore be considered together with the complete accuracy specification.<\/p>\n<h3>16 Single-Ended or Eight Differential Inputs<\/h3>\n<p>The module can be configured for as many as 16 single-ended analog inputs or eight differential inputs. The selected measurement mode depends on the signal source, grounding and noise environment.<\/p>\n<p>Single-ended mode provides the maximum channel count and is appropriate for short connections to ground-referenced sources with compatible ground potential.<\/p>\n<p>Differential mode measures the voltage between two input conductors. It generally provides better rejection of common-mode noise and is preferred for floating sources, low-level signals and longer cables.<\/p>\n<h3>625 kS\/s Single-Channel Sampling<\/h3>\n<p>The PXI-6281 supports a maximum sampling rate of 625 kS\/s when acquiring one analog input channel. This provides sufficient speed for many laboratory, industrial and automated test signals while maintaining 18-bit converter resolution.<\/p>\n<p>The module uses a multiplexed input architecture. It does not digitize every analog input simultaneously, so a short time interval exists between conversions of adjacent channels.<\/p>\n<h3>500 kS\/s Multichannel Sampling<\/h3>\n<p>When scanning multiple analog inputs, the PXI-6281 supports an aggregate rate up to 500 kS\/s. This rate is shared across all channels in the scan list.<\/p>\n<p>For example, eight channels sampled at equal rates can each be acquired at an average rate up to approximately 62.5 kS\/s before considering settling requirements and application overhead.<\/p>\n<p>High source impedance or large voltage changes between adjacent channels can require a slower conversion rate to allow the multiplexer and input amplifier to settle accurately.<\/p>\n<h3>Programmable Input Ranges<\/h3>\n<p>The PXI-6281 provides bipolar input ranges of \u00b1100 mV, \u00b1200 mV, \u00b1500 mV, \u00b11 V, \u00b12 V, \u00b15 V and \u00b110 V. Selecting a range close to the expected signal amplitude improves effective use of the ADC span.<\/p>\n<p>The selected range must include signal offset, expected noise and transient conditions. Do not apply voltages beyond the module&#8217;s maximum working and overvoltage protection specifications.<\/p>\n<h3>Low-Level Voltage Measurement<\/h3>\n<p>The \u00b1100 mV range and 18-bit ADC make the PXI-6281 suitable for conditioned low-level voltage signals. Applications can include bridge-amplifier outputs, laboratory sensors and precision device-characterization measurements.<\/p>\n<p>For very small signals, use shielded twisted-pair wiring and differential inputs. Temperature gradients, thermoelectric voltages and external noise can become significant compared with the measured signal.<\/p>\n<p>Direct connection of thermocouples, strain gauges and other specialized sensors may require external excitation, amplification, filtering, linearization or cold-junction compensation.<\/p>\n<h3>Two 16-Bit Analog Outputs<\/h3>\n<p>The PXI-6281 includes two 16-bit analog voltage outputs for generating test stimuli, control signals, setpoints and waveforms.<\/p>\n<p>A single output channel supports update rates up to 2.86 MS\/s. When both channels are used, the available update performance depends on the selected hardware-timed configuration.<\/p>\n<p>The outputs are intended for voltage signals and limited-current loads. Use a suitable external buffer or power amplifier when the load requires more current than the DAQ module can supply.<\/p>\n<h3>24 Digital I\/O Lines<\/h3>\n<p>The module provides 24 programmable digital I\/O lines arranged as three 8-bit ports. Individual lines can be used to monitor logic signals or control external devices through suitable interface circuitry.<\/p>\n<p>Applications include reading switches, controlling multiplexers, monitoring fixture status, enabling equipment and communicating logic states with a device under test.<\/p>\n<p>The lines provide TTL\/CMOS logic and should not be connected directly to 24 V industrial signals. Use external level conversion or an industrial digital I\/O module when higher field voltages are involved.<\/p>\n<h3>Correlated Digital I\/O<\/h3>\n<p>The eight lines on Port 0 support hardware-timed correlated digital input and output at rates up to 10 MHz, subject to system and bus performance.<\/p>\n<p>Correlated digital operations can share timing and triggering with analog input, analog output and counter tasks. This enables synchronized acquisition of analog and digital test data.<\/p>\n<p>Ports 1 and 2 are primarily used for static digital I\/O and programmable timing interface functions.<\/p>\n<h3>Two 32-Bit Counter\/Timers<\/h3>\n<p>The PXI-6281 includes two general-purpose 32-bit counter\/timers. They support edge counting, frequency measurement, period measurement, pulse-width measurement, two-edge separation and pulse generation.<\/p>\n<p>The counters can also be used with supported quadrature encoders for position and direction measurements. Counter signals are accessed through programmable-function interface terminals on the front connector.<\/p>\n<h3>Analog and Digital Triggering<\/h3>\n<p>Analog triggering allows an acquisition to respond when a voltage crosses a selected level or enters or leaves a defined window. Digital triggering uses a logic transition or internally routed event.<\/p>\n<p>Hardware triggers improve timing repeatability compared with starting an operation only through software. They are useful for transient recording, device validation and synchronized stimulus-response tests.<\/p>\n<h3>PXI Timing and Synchronization<\/h3>\n<p>The PXI-6281 can route clocks and trigger signals through the PXI chassis backplane. Supported resources include PXI trigger lines, PXI_STAR and the PXI reference clock.<\/p>\n<p>Multiple modules can share a trigger or reference clock for coordinated acquisition and generation. The onboard phase-locked loop can synchronize measurement timing to the PXI chassis clock.<\/p>\n<h3>Six DMA Channels<\/h3>\n<p>The module provides six DMA channels that can be used by analog input, analog output, digital input, digital output and the two counter\/timer subsystems.<\/p>\n<p>DMA transfers data between the module and host memory with limited processor intervention. This allows several hardware-timed tasks to run concurrently while preserving host resources for test execution, analysis and logging.<\/p>\n<h3>SCXI and SCC Signal Conditioning<\/h3>\n<p>The PXI-6281 can be used with compatible SCXI or SCC signal-conditioning hardware to add amplification, filtering, isolation and sensor-specific measurement capabilities.<\/p>\n<p>External signal conditioning can support thermocouples, strain gauges, accelerometers and higher-voltage signals. The conditioned output must remain within the PXI-6281 input and working-voltage limits.<\/p>\n<h3>NI-DAQmx Software Support<\/h3>\n<p>The PXI-6281 is controlled with the NI-DAQmx driver. NI-DAQmx provides functions for configuring channels, sample clocks, triggers, digital ports, analog outputs and counters.<\/p>\n<p>Supported programming environments include LabVIEW, LabWindows\/CVI and compatible C, C++, C# and Python applications. NI Measurement &amp; Automation Explorer can identify the module, manage calibration information and run basic test panels.<\/p>\n<p>Because the PXI-6281 is discontinued, verify compatibility between the module, operating system, PXI controller and NI-DAQmx version before installation.<\/p>\n<h3>Typical PXI-6281 Applications<\/h3>\n<ul>\n<li>Precision voltage measurement<\/li>\n<li>Automated production testing<\/li>\n<li>Laboratory data acquisition<\/li>\n<li>Design verification and validation<\/li>\n<li>Low-level signal measurement<\/li>\n<li>Sensor acquisition with external conditioning<\/li>\n<li>Mixed-signal functional testing<\/li>\n<li>Electronic component characterization<\/li>\n<li>Research and educational systems<\/li>\n<li>\u0420\u0435\u0433\u0438\u0441\u0442\u0440\u0430\u0446\u0438\u044f \u0434\u0430\u043d\u043d\u044b\u0445<\/li>\n<li>Frequency and pulse measurement<\/li>\n<li>SCXI-based measurement systems<\/li>\n<\/ul>\n<h3>Precision Voltage Data Logging<\/h3>\n<p>The 18-bit ADC and flexible input ranges make the PXI-6281 suitable for logging voltage signals where measurement detail is more important than very high channel density.<\/p>\n<p>Long-duration applications should use a sample rate appropriate for the signal bandwidth. Lower sampling rates reduce data-storage requirements and may improve rejection of unwanted high-frequency noise when combined with suitable filtering.<\/p>\n<h3>Automated Production Testing<\/h3>\n<p>In a production test system, the PXI-6281 can measure device voltages, generate analog stimuli, monitor digital states and perform counter measurements.<\/p>\n<p>PXI triggering and DMA transfers support repeatable automated sequences. The module can be combined with switching, power and measurement instruments to create a complete functional test system.<\/p>\n<h3>Research and Design Validation<\/h3>\n<p>The module can acquire precision voltage signals while its analog outputs provide control levels or test stimuli. Digital I\/O can control fixture states, and counters can measure frequency or pulse signals.<\/p>\n<p>These capabilities reduce the number of separate instruments required for experimental systems and early design-validation fixtures.<\/p>\n<h3>PXI-6281 Troubleshooting<\/h3>\n<h4>The PXI-6281 is not detected in NI MAX<\/h4>\n<p>Confirm that the module is fully installed in a compatible PXI or hybrid slot. Check chassis power, controller communication and NI-DAQmx installation, then restart the system and rescan the chassis.<\/p>\n<h4>Analog readings are noisy<\/h4>\n<p>Use shielded twisted-pair wiring and differential input mode where appropriate. Separate low-level signals from digital, motor and mains wiring, and check the grounding arrangement.<\/p>\n<h4>A floating signal gives unstable readings<\/h4>\n<p>Provide an appropriate bias-current return path between the input and analog ground. A floating source without a return path can drive the input amplifier outside its valid common-mode range.<\/p>\n<h4>Measurements change when additional channels are scanned<\/h4>\n<p>Reduce the channel-conversion rate and allow more settling time. High source impedance and large voltage differences between consecutive channels can increase multiplexing errors.<\/p>\n<h4>The actual rate is lower than 625 kS\/s<\/h4>\n<p>The 625 kS\/s specification applies to single-channel acquisition. The maximum aggregate rate for multichannel scanning is 500 kS\/s and must be divided across the channels in the task.<\/p>\n<h4>An analog output does not reach the requested voltage<\/h4>\n<p>Check load resistance, current demand and external wiring. Test the output without the load to determine whether excessive loading is causing the voltage drop.<\/p>\n<h4>A digital line cannot control an industrial load<\/h4>\n<p>The digital lines provide logic-level signals and cannot directly switch 24 V or high-current loads. Add a compatible relay driver, transistor interface or isolated industrial digital module.<\/p>\n<h4>A hardware trigger does not start the acquisition<\/h4>\n<p>Verify the selected trigger source, polarity, threshold and terminal route. Confirm that the task has been started and is waiting for the trigger before the event occurs.<\/p>\n<h4>Counter measurements are incorrect<\/h4>\n<p>Check the PFI terminal assignment, signal level, grounding and counter mode. Verify whether the application requires edge counting, frequency, period, pulse-width or encoder measurement.<\/p>\n<h3>PXI-6281 Comparison with Similar DAQ Modules<\/h3>\n<table>\n<tbody>\n<tr>\n<th>\u041c\u043e\u0434\u0435\u043b\u044c<\/th>\n<th>Primary Configuration<\/th>\n<th>Best Suited For<\/th>\n<\/tr>\n<tr>\n<td>PXI-6280<\/td>\n<td>16 AI, 18-bit, 625 kS\/s, no AO<\/td>\n<td>Precision analog acquisition without output generation<\/td>\n<\/tr>\n<tr>\n<td>PXI-6281<\/td>\n<td>16 AI, 2 AO, 24 DIO, 18-bit<\/td>\n<td>Precision multifunction voltage measurement and control<\/td>\n<\/tr>\n<tr>\n<td>PXI-6284<\/td>\n<td>32 AI, 48 DIO, 18-bit<\/td>\n<td>Higher input and digital channel density<\/td>\n<\/tr>\n<tr>\n<td>PXI-6289<\/td>\n<td>32 AI, 4 AO, 48 DIO, 18-bit<\/td>\n<td>High-accuracy systems requiring more multifunction I\/O<\/td>\n<\/tr>\n<tr>\n<td>PXIe-4309<\/td>\n<td>32 AI, flexible resolution up to 28 bits<\/td>\n<td>Modern high-accuracy PXI Express analog acquisition<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>PXI-6281 vs PXI-6280<\/h3>\n<p>Both modules provide 16 analog inputs with 18-bit resolution and a maximum single-channel sampling rate of 625 kS\/s. The PXI-6281 adds two analog outputs and additional multifunction capabilities.<\/p>\n<p>Choose the PXI-6280 when only precision acquisition is required. Select the PXI-6281 when the test system must also generate analog stimulus or control voltages.<\/p>\n<h3>PXI-6281 vs PXI-6289<\/h3>\n<p>The PXI-6281 provides 16 analog inputs, two analog outputs and 24 digital I\/O lines. The PXI-6289 doubles the analog input count to 32 and provides four analog outputs and 48 digital I\/O lines.<\/p>\n<p>Select the PXI-6281 for lower-channel-count precision systems. Choose the PXI-6289 when additional analog and digital channels are more important than minimizing module cost and wiring complexity.<\/p>\n<h3>PXI-6281 vs PXI-6251<\/h3>\n<p>The PXI-6281 provides 18-bit analog input resolution and sampling up to 625 kS\/s. The PXI-6251 provides 16-bit resolution but supports a higher maximum single-channel rate of 1.25 MS\/s.<\/p>\n<p>Select the PXI-6281 when measurement resolution and low-level accuracy are priorities. Choose the PXI-6251 when greater acquisition speed is more important.<\/p>\n<h3>PXI-6281 vs PXIe-4309<\/h3>\n<p>NI identifies the PXIe-4309 as the suggested replacement for precision analog input applications. The PXIe-4309 provides 32 analog input channels, flexible resolution up to 28 bits and higher acquisition performance.<\/p>\n<p>The PXIe-4309 is not a direct functional replacement for every PXI-6281 application because it does not reproduce the same analog output, digital I\/O and counter configuration. Separate modules may be required to replace those functions.<\/p>\n<h3>Recommended Related Products<\/h3>\n<ul>\n<li><a href=\"https:\/\/pxisource.com\/ru\/product\/pxi-6280\/\">PXI-6280 18-Bit Precision Analog Input Module<\/a><\/li>\n<li><a href=\"https:\/\/pxisource.com\/ru\/product\/%d0%bf%d0%ba%d1%81%d0%b8-6284\/\">PXI-6284 32-Channel High-Accuracy DAQ Module<\/a><\/li>\n<li><a href=\"https:\/\/pxisource.com\/ru\/product\/pxi-6289\/\">PXI-6289 High-Accuracy Multifunction DAQ Module<\/a><\/li>\n<li><a href=\"https:\/\/pxisource.com\/ru\/product\/%d0%bf%d0%ba%d1%81%d0%b8-6251\/\">PXI-6251 High-Speed Multifunction DAQ Module<\/a><\/li>\n<li><a href=\"https:\/\/pxisource.com\/ru\/product\/pxie-4309\/\">PXIe-4309 High-Accuracy Analog Input Module<\/a><\/li>\n<li><a href=\"https:\/\/pxisource.com\/ru\/product-category\/%d0%bd%d0%b8\/pxi-%d1%81%d0%b8%d1%81%d1%82%d0%b5%d0%bc%d1%81\/%d0%bc%d0%be%d0%b4%d1%83%d0%bb%d0%b8-pxi\/\">View More NI PXI and PXI Express Modules<\/a><\/li>\n<\/ul>\n<h3>Selecting the Right High-Accuracy DAQ Module<\/h3>\n<p>Choose the PXI-6281 when the application requires 18-bit precision analog input together with two analog outputs, digital I\/O and counter\/timer functions.<\/p>\n<p>Select the PXI-6280 when analog outputs are unnecessary, the PXI-6284 for additional input density or the PXI-6289 for more analog outputs and digital lines. Consider the PXIe-4309 when building a new precision PXI Express acquisition system.<\/p>\n<h3>Why Choose the PXI-6281?<\/h3>\n<ul>\n<li>Provides 18-bit analog input resolution<\/li>\n<li>Supports 16 single-ended or eight differential inputs<\/li>\n<li>Offers sampling rates up to 625 kS\/s<\/li>\n<li>Includes low-level ranges down to \u00b1100 mV<\/li>\n<li>Provides two 16-bit analog outputs<\/li>\n<li>Includes 24 digital I\/O lines<\/li>\n<li>Supports two 32-bit counter\/timers<\/li>\n<li>Provides analog, digital and PXI triggering<\/li>\n<li>Uses six DMA channels for concurrent tasks<\/li>\n<li>Integrates with NI-DAQmx and LabVIEW<\/li>\n<\/ul>\n<h3>Frequently Asked Questions<\/h3>\n<h4>What is the PXI-6281?<\/h4>\n<p>The PXI-6281 is an 18-bit M Series PXI multifunction DAQ module with analog input, analog output, digital I\/O and counter\/timer capabilities.<\/p>\n<h4>What is the PXI-6281 part number?<\/h4>\n<p>The standard NI part number for the PXI-6281 is <strong>779121-01<\/strong>.<\/p>\n<h4>How many analog inputs does it provide?<\/h4>\n<p>The module provides 16 single-ended analog inputs or eight differential analog inputs.<\/p>\n<h4>What is the maximum analog input sampling rate?<\/h4>\n<p>The maximum single-channel sampling rate is 625 kS\/s. Multichannel acquisition supports an aggregate rate up to 500 kS\/s.<\/p>\n<h4>Does the PXI-6281 sample every channel simultaneously?<\/h4>\n<p>No. It uses a multiplexed ADC, so the selected channels are converted sequentially rather than at exactly the same instant.<\/p>\n<h4>What analog input ranges are supported?<\/h4>\n<p>The module supports bipolar ranges from \u00b1100 mV through \u00b110 V, including \u00b10.2 V, \u00b10.5 V, \u00b11 V, \u00b12 V and \u00b15 V.<\/p>\n<h4>Does it provide analog outputs?<\/h4>\n<p>Yes. The PXI-6281 includes two 16-bit analog voltage outputs with a maximum single-channel update rate of 2.86 MS\/s.<\/p>\n<h4>How many digital I\/O lines are included?<\/h4>\n<p>The module provides 24 digital I\/O lines. Eight Port 0 lines support hardware-timed correlated digital waveform operations.<\/p>\n<h4>Which connector does the module use?<\/h4>\n<p>The PXI-6281 uses one 68-pin VHDCI front-panel connector.<\/p>\n<h4>Which software controls the PXI-6281?<\/h4>\n<p>The module is controlled through NI-DAQmx and can be programmed with LabVIEW, LabWindows\/CVI and compatible text-based environments.<\/p>\n<h4>What is the recommended replacement for the PXI-6281?<\/h4>\n<p>NI recommends the PXIe-4309 for modern high-accuracy analog input applications. Additional modules may be required to replace the PXI-6281&#8217;s analog output and digital functions.<\/p>\n<h3>Request a Quote for the PXI-6281<\/h3>\n<p>Contact us for current availability, condition, lead time and project pricing for the <strong>PXI-6281 18-Bit 625 kS\/s Multifunction PXI DAQ Module<\/strong>. We can also help identify compatible VHDCI cables, terminal blocks, PXI chassis and modern high-accuracy replacement modules.<\/p>","protected":false},"excerpt":{"rendered":"<p>PXI-6281 18-Bit 625 kS\/s Multifunction PXI DAQ Module The PXI-6281 is a high-accuracy M Series PXI multifunction data acquisition module<\/p>","protected":false},"featured_media":31261,"template":"","meta":{"_acf_changed":false},"product_brand":[18],"product_cat":[667],"product_tag":[],"class_list":["post-30168","product","type-product","status-publish","has-post-thumbnail","product_brand-national-instruments","product_cat-pxi-modules","first","instock","shipping-taxable","product-type-simple"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.0 (Yoast SEO v28.1) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>NI PXI-6281 PXI Multifunction I\/O Module 779121-01, In Stock | Project Pricing<\/title>\n<meta name=\"description\" content=\"The PXI-6281 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