{"id":34635,"date":"2026-08-07T13:19:42","date_gmt":"2026-08-07T05:19:42","guid":{"rendered":"https:\/\/pxisource.com\/?post_type=product&#038;p=34635"},"modified":"2026-09-18T15:03:56","modified_gmt":"2026-09-18T07:03:56","slug":"usb-6251","status":"publish","type":"product","link":"https:\/\/pxisource.com\/ru\/product\/usb-6251\/","title":{"rendered":"USB-6251"},"content":{"rendered":"<h3>USB-6251 1.25 MS\/s USB M Series Multifunction DAQ<\/h3>\n<p>\u0417\u0435\u043c\u043b\u044f <strong>NI USB-6251<\/strong> is a high-speed M Series multifunction data acquisition device for automated test, research, control and electronic validation. It combines fast multiplexed analog input, hardware-timed analog output, digital I\/O and counter\/timer resources in an external USB enclosure.<\/p>\n<p>The USB-6251 provides 16 single-ended or eight differential analog inputs with 16-bit resolution. Its maximum input rate reaches 1.25 MS\/s on one channel and 1.00 MS\/s aggregate during multichannel scanning.<\/p>\n<p>Two 16-bit analog outputs, 24 digital I\/O lines and two 32-bit counters allow the device to perform coordinated stimulus, response measurement and fixture control.<\/p>\n<h3>Key Features of the USB-6251<\/h3>\n<ul>\n<li>16 single-ended or 8 differential analog inputs<\/li>\n<li>16-bit ADC resolution<\/li>\n<li>1.25 MS\/s maximum single-channel input rate<\/li>\n<li>1.00 MS\/s maximum aggregate multichannel rate<\/li>\n<li>Seven programmable input ranges from \u00b10.1 V to \u00b110 V<\/li>\n<li>1.7 MHz small-signal input bandwidth<\/li>\n<li>Two 16-bit analog outputs<\/li>\n<li>Up to approximately 2.86 MS\/s analog output<\/li>\n<li>24 individually programmable digital I\/O lines<\/li>\n<li>Eight correlated digital I\/O lines<\/li>\n<li>Two 32-bit counter\/timers<\/li>\n<li>Analog and digital triggering<\/li>\n<li>USB 2.0 Hi-Speed connectivity<\/li>\n<li>Screw-terminal, BNC and mass-termination versions<\/li>\n<li>NI-DAQmx driver support<\/li>\n<\/ul>\n<h2>USB-6251 Technical Specifications<\/h2>\n<table>\n<tbody>\n<tr>\n<th>Product Model<\/th>\n<td>USB-6251<\/td>\n<\/tr>\n<tr>\n<th>Product Family<\/th>\n<td>High-speed NI M Series multifunction DAQ<\/td>\n<\/tr>\n<tr>\n<th>Analog Inputs<\/th>\n<td>16 single-ended or 8 differential<\/td>\n<\/tr>\n<tr>\n<th>ADC Resolution<\/th>\n<td>16 bits<\/td>\n<\/tr>\n<tr>\n<th>Single-Channel AI Rate<\/th>\n<td>1.25 MS\/s maximum<\/td>\n<\/tr>\n<tr>\n<th>Multichannel AI Rate<\/th>\n<td>1.00 MS\/s aggregate<\/td>\n<\/tr>\n<tr>\n<th>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>Input Bandwidth<\/th>\n<td>1.7 MHz<\/td>\n<\/tr>\n<tr>\n<th>CMRR<\/th>\n<td>100 dB from DC to 60 Hz<\/td>\n<\/tr>\n<tr>\n<th>Analog Outputs<\/th>\n<td>2<\/td>\n<\/tr>\n<tr>\n<th>DAC Resolution<\/th>\n<td>16 bits<\/td>\n<\/tr>\n<tr>\n<th>Analog Output Range<\/th>\n<td>\u00b110 V<\/td>\n<\/tr>\n<tr>\n<th>Maximum AO Rate<\/th>\n<td>Up to approximately 2.86 MS\/s, configuration dependent<\/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 individually programmable lines<\/td>\n<\/tr>\n<tr>\n<th>Correlated Digital I\/O<\/th>\n<td>8 Port 0 lines<\/td>\n<\/tr>\n<tr>\n<th>Counters<\/th>\n<td>2 \u00d7 32-bit<\/td>\n<\/tr>\n<tr>\n<th>USB Interface<\/th>\n<td>USB 2.0 Hi-Speed<\/td>\n<\/tr>\n<tr>\n<th>External Power<\/th>\n<td>Required<\/td>\n<\/tr>\n<tr>\n<th>Connector Options<\/th>\n<td>Screw terminal, BNC and mass termination<\/td>\n<\/tr>\n<tr>\n<th>\u041f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0430 \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u043d\u043e\u0433\u043e \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0435\u043d\u0438\u044f<\/th>\n<td>\u041d\u0418-DAQmx<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>USB-6251 Part Number and Accessories<\/h2>\n<p>USB-6251 orderable configurations differ by connector type and enclosure. Confirm the full part number rather than ordering only by the USB-6251 family name.<\/p>\n<table>\n<tbody>\n<tr>\n<th>Configuration or Accessory<\/th>\n<th>\u041e\u043f\u0438\u0441\u0430\u043d\u0438\u0435<\/th>\n<\/tr>\n<tr>\n<td>USB-6251 Screw Terminal<\/td>\n<td>Integrated terminals for flexible sensor and fixture wiring<\/td>\n<\/tr>\n<tr>\n<td>USB-6251 BNC<\/td>\n<td>Direct coaxial connections for laboratory measurements<\/td>\n<\/tr>\n<tr>\n<td>USB-6251 Mass Termination<\/td>\n<td>High-density connection to custom fixtures and cable assemblies<\/td>\n<\/tr>\n<tr>\n<td>USB Cable<\/td>\n<td>Connection to the host computer<\/td>\n<\/tr>\n<tr>\n<td>External Power Supply<\/td>\n<td>Required power for the enclosed USB device<\/td>\n<\/tr>\n<tr>\n<td>SHC68-68-EPM Cable<\/td>\n<td>Shielded cable commonly used with compatible 68-pin mass-termination accessories<\/td>\n<\/tr>\n<tr>\n<td>SCB-68A Connector Block<\/td>\n<td>Shielded screw-terminal connection for compatible 68-pin configurations<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>1.25 MS\/s Analog Input<\/h3>\n<p>The USB-6251 supports a maximum 1.25 MS\/s sampling rate when acquiring one analog input. During multichannel scanning, the maximum aggregate rate is 1.00 MS\/s.<\/p>\n<p>This multiplexed architecture is appropriate for fast control signals, electronic waveforms and transient measurements that do not require simultaneous sampling across channels.<\/p>\n<h3>Seven Programmable Input Ranges<\/h3>\n<p>Input ranges from \u00b10.1 V through \u00b110 V provide flexibility for both low-level and standard laboratory signals. Selecting a narrower range increases ADC utilization and measurement sensitivity.<\/p>\n<h3>High-Speed Analog Generation<\/h3>\n<p>Two analog outputs can generate static voltages, arbitrary waveforms and periodic signals. Hardware timing provides more consistent waveform generation than repeated software commands.<\/p>\n<p>The outputs should not be used as programmable power supplies. External amplification is required when the DUT needs higher current or power.<\/p>\n<h2>USB-6251 Applications<\/h2>\n<ul>\n<li>High-speed laboratory data acquisition<\/li>\n<li>Electronic functional testing<\/li>\n<li>Stimulus-and-response measurement<\/li>\n<li>Automated production testing<\/li>\n<li>Transient voltage capture<\/li>\n<li>Waveform generation<\/li>\n<li>Motor and encoder testing<\/li>\n<li>Digital fixture control<\/li>\n<li>Research and prototype validation<\/li>\n<\/ul>\n<h3>Electronic Device Validation<\/h3>\n<p>The USB-6251 can generate analog stimulus while measuring DUT voltages and monitoring digital status signals. Counters can measure frequency, pulse width and encoder position.<\/p>\n<h3>Portable High-Speed Measurement<\/h3>\n<p>The external enclosure allows a high-performance DAQ system to be connected to a desktop or laptop without opening the computer. An external power supply is still required.<\/p>\n<h2>USB-6251 Installation Workflow<\/h2>\n<h4>Step 1: Confirm the Connector Version<\/h4>\n<p>Identify whether the unit uses BNC, screw terminals or mass termination and select compatible accessories.<\/p>\n<h4>Step 2: Install NI-DAQmx<\/h4>\n<p>Install a driver version that supports the device, operating system and development environment.<\/p>\n<h4>Step 3: Connect External Power<\/h4>\n<p>Use the required approved supply and verify polarity and connector security.<\/p>\n<h4>Step 4: Connect USB<\/h4>\n<p>Use a high-quality USB 2.0 cable and avoid unnecessary hubs or extension cables.<\/p>\n<h4>Step 5: Configure Input Ranges<\/h4>\n<p>Select the smallest suitable voltage range and the correct differential, RSE or NRSE wiring mode.<\/p>\n<h4>Step 6: Validate Maximum Throughput<\/h4>\n<p>Test the complete channel list and application at the intended sample rate before deployment.<\/p>\n<h2>USB-6251 Troubleshooting<\/h2>\n<h4>The Device Appears in NI MAX but Acquisition Fails<\/h4>\n<p>Check whether another task has reserved the device. Stop other NI-DAQmx tasks and run a self-test.<\/p>\n<h4>The Device Cannot Maintain 1.25 MS\/s on Multiple Channels<\/h4>\n<p>The 1.25 MS\/s rating applies to single-channel acquisition. Multichannel operation is limited to 1.00 MS\/s aggregate.<\/p>\n<h4>Signals Are Distorted After Channel Switching<\/h4>\n<p>Reduce source impedance, increase settling time or add buffer amplifiers between high-impedance sensors and the DAQ inputs.<\/p>\n<h4>Analog Output Timing Is Irregular<\/h4>\n<p>Use hardware-timed waveform generation rather than software-timed single-point updates.<\/p>\n<h2>USB-6251 Comparison<\/h2>\n<table>\n<tbody>\n<tr>\n<th>\u041c\u043e\u0434\u0435\u043b\u044c<\/th>\n<th>AI Channels<\/th>\n<th>AI Resolution<\/th>\n<th>Maximum AI Rate<\/th>\n<th>AO Channels<\/th>\n<\/tr>\n<tr>\n<td>USB-6221<\/td>\n<td>16<\/td>\n<td>16 bits<\/td>\n<td>250 kS\/s<\/td>\n<td>2<\/td>\n<\/tr>\n<tr>\n<td>USB-6251<\/td>\n<td>16<\/td>\n<td>16 bits<\/td>\n<td>1,25 \u041c\u0421\u043c\/\u0441<\/td>\n<td>2<\/td>\n<\/tr>\n<tr>\n<td>USB-6259<\/td>\n<td>32<\/td>\n<td>16 bits<\/td>\n<td>1,25 \u041c\u0421\u043c\/\u0441<\/td>\n<td>4<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Choose the USB-6251 for high-speed applications requiring 16 analog inputs. Choose the <a href=\"https:\/\/pxisource.com\/ru\/product\/usb-6259\/\">USB-6259<\/a> when the system needs twice the analog input count, four analog outputs and 48 digital lines.<\/p>\n<h2>USB-6251 Frequently Asked Questions<\/h2>\n<h4>What is the maximum analog input rate?<\/h4>\n<p>The USB-6251 supports 1.25 MS\/s on one channel and 1.00 MS\/s aggregate for multichannel acquisition.<\/p>\n<h4>How many analog outputs are included?<\/h4>\n<p>It provides two 16-bit analog output channels.<\/p>\n<h4>Does the USB-6251 require external power?<\/h4>\n<p>Yes. The enclosed USB version requires an appropriate external DC power supply.<\/p>\n<h4>Is the USB-6251 simultaneously sampled?<\/h4>\n<p>No. It uses a multiplexed analog input architecture with one ADC shared by the active channels.<\/p>\n<h4>Which driver supports it?<\/h4>\n<p>The USB-6251 is controlled through NI-DAQmx.<\/p>\n<h3>Recommended Related Products<\/h3>\n<ul>\n<li><a href=\"https:\/\/pxisource.com\/ru\/product\/usb-6221\/\">USB-6221 Multifunction DAQ Device<\/a><\/li>\n<li><a href=\"https:\/\/pxisource.com\/ru\/product\/usb-6255\/\">USB-6255 80-Channel Multifunction DAQ<\/a><\/li>\n<li><a href=\"https:\/\/pxisource.com\/ru\/product\/usb-6259\/\">USB-6259 High-Density Multifunction DAQ<\/a><\/li>\n<li><a href=\"https:\/\/pxisource.com\/ru\/product\/usb-6289\/\">USB-6289 18-Bit Multifunction DAQ<\/a><\/li>\n<\/ul>\n<h3>Request a Quote for the USB-6251<\/h3>\n<p>Contact us for availability, connector selection and project pricing for the <strong>NI USB-6251 high-speed multifunction DAQ device<\/strong>.<\/p>","protected":false},"excerpt":{"rendered":"<p>USB-6251 1.25 MS\/s USB M Series Multifunction DAQ The NI USB-6251 is a high-speed M Series multifunction data acquisition device<\/p>","protected":false},"featured_media":33673,"template":"","meta":{"_acf_changed":false},"product_brand":[18],"product_cat":[674,800],"product_tag":[],"class_list":["post-34635","product","type-product","status-publish","has-post-thumbnail","product_brand-national-instruments","product_cat-pci-modules","product_cat-usb-devices","first","instock","shipping-taxable","product-type-simple"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.0 (Yoast SEO v28.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>NI USB-6251 PCI Multifunction I\/O Device 779627-02, In Stock | Project Pricing<\/title>\n<meta name=\"description\" content=\"The USB-6251 is a high-speed 16-bit USB DAQ device with 16 analog inputs, two 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