{"id":34902,"date":"2026-08-08T16:46:56","date_gmt":"2026-08-08T08:46:56","guid":{"rendered":"https:\/\/pxisource.com\/?post_type=product&#038;p=34902"},"modified":"2026-08-31T16:02:13","modified_gmt":"2026-08-31T08:02:13","slug":"pxi-2558","status":"publish","type":"product","link":"https:\/\/pxisource.com\/ru\/product\/pxi-2558\/","title":{"rendered":"PXI-2558"},"content":{"rendered":"<h3>PXI-2558 2.5 GHz Quad SPDT 75 \u03a9 PXI RF Relay Module<\/h3>\n<p>\u0417\u0435\u043c\u043b\u044f <strong>PXI-2558<\/strong> is a general-purpose PXI RF relay module designed for automated video testing, 75 \u03a9 RF signal routing and high-channel-count switch systems. It provides four independent single-pole double-throw relays in a single-slot PXI module.<\/p>\n<p>Each relay bank contains a common connection, a normally closed connection and a normally open connection. This quad SPDT architecture allows four independent 75 \u03a9 signal paths to be switched between two destinations or sources under software control.<\/p>\n<p>With a DC to 2.5 GHz operating range, low insertion loss, strong isolation and direct mini-75 \u03a9 SMB connectivity, the PXI-2558 is suitable for cable television, set-top box, video distribution and broadband RF test applications.<\/p>\n<h3>Key Features of the PXI-2558<\/h3>\n<ul>\n<li>Four independent SPDT RF relays<\/li>\n<li>Four common, four normally open and four normally closed connections<\/li>\n<li>DC to 2.5 GHz frequency range<\/li>\n<li>75 \u03a9 nominal characteristic impedance<\/li>\n<li>Electromechanical latching relays<\/li>\n<li>Less than 0.6 dB insertion loss through 1 GHz<\/li>\n<li>Less than 1.1 dB insertion loss through 2.5 GHz<\/li>\n<li>Greater than 60 dB typical isolation through 1 GHz<\/li>\n<li>Greater than 36 dB typical isolation through 2.5 GHz<\/li>\n<li>30 V maximum switching voltage<\/li>\n<li>0.5 A maximum switching and carry current per channel<\/li>\n<li>10 W maximum RF switching power<\/li>\n<li>Less than 20 ps typical channel-to-channel skew<\/li>\n<li>700 ps typical propagation delay<\/li>\n<li>12 gold-plated mini-75 \u03a9 SMB connectors<\/li>\n<li>Onboard relay-count tracking<\/li>\n<li>PXI hardware trigger support<\/li>\n<li>NI-SWITCH and NI Switch Executive compatibility<\/li>\n<\/ul>\n<h3>PXI-2558 Technical Specifications<\/h3>\n<table>\n<tbody>\n<tr>\n<th>Product Model<\/th>\n<td>PXI-2558<\/td>\n<\/tr>\n<tr>\n<th>Part Number<\/th>\n<td>778572-58<\/td>\n<\/tr>\n<tr>\n<th>Product Type<\/th>\n<td>PXI RF relay switch module<\/td>\n<\/tr>\n<tr>\n<th>Topology<\/th>\n<td>Four-bank SPDT<\/td>\n<\/tr>\n<tr>\n<th>Number of Independent Banks<\/th>\n<td>4<\/td>\n<\/tr>\n<tr>\n<th>Relay Configuration<\/th>\n<td>SPDT, single-pole double-throw<\/td>\n<\/tr>\n<tr>\n<th>Connections per Bank<\/th>\n<td>COM, normally open and normally closed<\/td>\n<\/tr>\n<tr>\n<th>\u0414\u0438\u0430\u043f\u0430\u0437\u043e\u043d \u0447\u0430\u0441\u0442\u043e\u0442<\/th>\n<td>DC to 2.5 GHz<\/td>\n<\/tr>\n<tr>\n<th>Characteristic Impedance<\/th>\n<td>75 \u03a9 nominal<\/td>\n<\/tr>\n<tr>\n<th>Maximum Switching Voltage<\/th>\n<td>30 V<\/td>\n<\/tr>\n<tr>\n<th>Maximum Switching Current<\/th>\n<td>0,5 \u0410 \u043d\u0430 \u043a\u0430\u043d\u0430\u043b<\/td>\n<\/tr>\n<tr>\n<th>Maximum Carry Current<\/th>\n<td>0,5 \u0410 \u043d\u0430 \u043a\u0430\u043d\u0430\u043b<\/td>\n<\/tr>\n<tr>\n<th>Maximum RF Switching Power<\/th>\n<td>10 W<\/td>\n<\/tr>\n<tr>\n<th>Initial DC Path Resistance<\/th>\n<td>Less than 0.35 \u03a9 typical<\/td>\n<\/tr>\n<tr>\n<th>End-of-Life DC Path Resistance<\/th>\n<td>1.0 \u03a9 or greater<\/td>\n<\/tr>\n<tr>\n<th>Maximum Insertion Loss through 1 GHz<\/th>\n<td>Less than 0.6 dB; less than 0.3 dB typical<\/td>\n<\/tr>\n<tr>\n<th>Maximum Insertion Loss through 2 GHz<\/th>\n<td>Less than 1.05 dB; less than 0.7 dB typical<\/td>\n<\/tr>\n<tr>\n<th>Maximum Insertion Loss through 2.5 GHz<\/th>\n<td>Less than 1.1 dB; less than 0.7 dB typical<\/td>\n<\/tr>\n<tr>\n<th>Maximum VSWR through 1 GHz<\/th>\n<td>Less than 1.25; less than 1.1 typical<\/td>\n<\/tr>\n<tr>\n<th>Maximum VSWR through 2 GHz<\/th>\n<td>Less than 1.6; less than 1.45 typical<\/td>\n<\/tr>\n<tr>\n<th>Maximum VSWR through 2.5 GHz<\/th>\n<td>Less than 1.6; less than 1.45 typical<\/td>\n<\/tr>\n<tr>\n<th>Typical Isolation through 1 GHz<\/th>\n<td>Greater than 60 dB<\/td>\n<\/tr>\n<tr>\n<th>Typical Isolation through 2 GHz<\/th>\n<td>Greater than 43 dB<\/td>\n<\/tr>\n<tr>\n<th>Typical Isolation through 2.5 GHz<\/th>\n<td>Greater than 36 dB<\/td>\n<\/tr>\n<tr>\n<th>Typical Crosstalk through 1 GHz<\/th>\n<td>Less than -62 dB<\/td>\n<\/tr>\n<tr>\n<th>Typical Crosstalk through 2 GHz<\/th>\n<td>Less than -56 dB<\/td>\n<\/tr>\n<tr>\n<th>Typical Crosstalk through 2.5 GHz<\/th>\n<td>Less than -48 dB<\/td>\n<\/tr>\n<tr>\n<th>Typical Channel-to-Channel Skew<\/th>\n<td>Less than 20 ps<\/td>\n<\/tr>\n<tr>\n<th>Typical Propagation Delay<\/th>\n<td>700 ps<\/td>\n<\/tr>\n<tr>\n<th>Typical Rise Time<\/th>\n<td>55 ps<\/td>\n<\/tr>\n<tr>\n<th>Maximum Relay Operate Time<\/th>\n<td>10.4 ms<\/td>\n<\/tr>\n<tr>\n<th>\u0422\u0438\u043f \u0440\u0435\u043b\u0435<\/th>\n<td>Electromechanical latching<\/td>\n<\/tr>\n<tr>\n<th>Expected Mechanical Relay Life<\/th>\n<td>1,000,000 cycles<\/td>\n<\/tr>\n<tr>\n<th>Expected Electrical Relay Life<\/th>\n<td>300,000 cycles at 30 V, 10 mA DC resistive<\/td>\n<\/tr>\n<tr>\n<th>Input Trigger Sources<\/th>\n<td>PXI trigger lines 0 through 7<\/td>\n<\/tr>\n<tr>\n<th>Minimum Input Trigger Pulse Width<\/th>\n<td>150 ns<\/td>\n<\/tr>\n<tr>\n<th>Output Trigger Destinations<\/th>\n<td>PXI trigger lines 0 through 7<\/td>\n<\/tr>\n<tr>\n<th>Typical Output Trigger Pulse Width<\/th>\n<td>2 \u00b5s<\/td>\n<\/tr>\n<tr>\n<th>Front-Panel Connectors<\/th>\n<td>12 gold-plated mini-75 \u03a9 SMB jacks<\/td>\n<\/tr>\n<tr>\n<th>PXI Power Requirement<\/th>\n<td>3.7 W at 5 V; 0.3 W at 3.3 V<\/td>\n<\/tr>\n<tr>\n<th>Operating Temperature<\/th>\n<td>0\u00b0C to 55\u00b0C<\/td>\n<\/tr>\n<tr>\n<th>Storage Temperature<\/th>\n<td>-20\u00b0C to 70\u00b0C<\/td>\n<\/tr>\n<tr>\n<th>Relative Humidity<\/th>\n<td>5% to 85%, noncondensing<\/td>\n<\/tr>\n<tr>\n<th>Maximum Operating Altitude<\/th>\n<td>2,000 m<\/td>\n<\/tr>\n<tr>\n<th>Dimensions<\/th>\n<td>21.6 \u00d7 2.0 \u00d7 13.0 cm<\/td>\n<\/tr>\n<tr>\n<th>Weight<\/th>\n<td>227 g<\/td>\n<\/tr>\n<tr>\n<th>Module Format<\/th>\n<td>3U, single-slot PXI\/cPCI module<\/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>NI-SWITCH and NI Switch Executive<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>PXI-2558 Part Number and Connectivity<\/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-2558<\/td>\n<td>778572-58<\/td>\n<td>2.5 GHz, 75 \u03a9, quad SPDT PXI RF relay module<\/td>\n<\/tr>\n<tr>\n<td>Mini-75 \u03a9 SMB Cable<\/td>\n<td>Verify availability<\/td>\n<td>Mini-75 \u03a9 SMB to mini-75 \u03a9 SMB coaxial connection<\/td>\n<\/tr>\n<tr>\n<td>Mini-75 \u03a9 SMB to BNC Cable<\/td>\n<td>Verify availability<\/td>\n<td>75 \u03a9 coaxial connection for compatible BNC equipment<\/td>\n<\/tr>\n<tr>\n<td>Mini-75 \u03a9 SMB to Type-F Cable<\/td>\n<td>Verify compatibility<\/td>\n<td>Connection option for cable television and video equipment<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>NI lists the original mini-75 \u03a9 SMB cable options for this product family as no longer available. Before ordering third-party or replacement cables, verify the connector dimensions, gender, 75 \u03a9 impedance and required frequency range.<\/p>\n<h3>Quad SPDT Relay Architecture<\/h3>\n<p>The PXI-2558 contains four independent SPDT relay banks. Each bank has a common terminal, a normally closed terminal and a normally open terminal.<\/p>\n<p>When a bank is in its default position, the common connection is routed to the normally closed connection. Changing the relay state routes the common to the normally open connection.<\/p>\n<p>This architecture can select between two RF sources, direct one signal toward two possible destinations or create larger custom multiplexer networks using multiple relay banks.<\/p>\n<h3>Four Independent RF Switching Banks<\/h3>\n<p>Each of the four SPDT banks operates independently. One bank can select a video source while another switches an analyzer input or connects a separate device under test.<\/p>\n<p>Independent control makes the PXI-2558 more flexible than a single common multiplexer when the application requires several unrelated changeover paths.<\/p>\n<p>When designing a larger switch network, consider the cumulative insertion loss, VSWR and isolation of every switch stage in the final route.<\/p>\n<h3>75 \u03a9 Video and RF Signal Routing<\/h3>\n<p>The PXI-2558 is designed for 75 \u03a9 signal environments commonly used in cable television, broadband video, video distribution and broadcast test equipment.<\/p>\n<p>Maintaining the correct impedance helps reduce reflections and amplitude errors. Cables, adapters, terminations, sources and instrument inputs should all use 75 \u03a9 impedance whenever possible.<\/p>\n<p>A physical connector adapter does not convert electrical impedance. If a 50 \u03a9 instrument must be connected to the module, use an appropriate impedance-matching solution and account for its loss.<\/p>\n<h3>DC to 2.5 GHz Frequency Range<\/h3>\n<p>The electromechanical relay paths support signals from DC through 2.5 GHz. This allows the same module to route baseband, video, intermediate-frequency and RF signals.<\/p>\n<p>Actual system bandwidth depends on the complete signal path, including cables, adapters, fixture wiring and connected instruments. Every external component should be rated for the highest required frequency.<\/p>\n<h3>\u041d\u0438\u0437\u043a\u0438\u0435 \u0432\u043d\u043e\u0441\u0438\u043c\u044b\u0435 \u043f\u043e\u0442\u0435\u0440\u0438<\/h3>\n<p>The PXI-2558 provides less than 0.6 dB insertion loss through 1 GHz and less than 1.1 dB through 2.5 GHz. Typical insertion loss is approximately 0.3 dB through 1 GHz and 0.7 dB through 2.5 GHz.<\/p>\n<p>Low path loss helps preserve RF and video signal amplitude. For precise measurements, characterize each route with the installed cables and apply path-loss compensation when required.<\/p>\n<h3>VSWR Performance<\/h3>\n<p>Maximum VSWR is less than 1.25 through 1 GHz and less than 1.6 through 2.5 GHz. Controlled VSWR reduces reflections when the module is connected to properly matched 75 \u03a9 equipment.<\/p>\n<p>Damaged connectors, incorrect cable impedance and unterminated external paths can degrade system VSWR. Inspect each connection and use suitable termination where required by the source or instrument.<\/p>\n<h3>Isolation and Crosstalk<\/h3>\n<p>Typical relay isolation is greater than 60 dB through 1 GHz and greater than 36 dB through 2.5 GHz. Typical crosstalk is below -62 dB through 1 GHz and below -48 dB through 2.5 GHz.<\/p>\n<p>System-level isolation can be affected by cable routing, shielding, grounding and external fixture design. Keep high-level video and RF sources separated from sensitive measurement paths.<\/p>\n<h3>10 W RF Switching Capability<\/h3>\n<p>The PXI-2558 supports up to 10 W of RF switching power. The connected signal must also remain within the module\u2019s 30 V maximum switching-voltage and 0.5 A maximum current ratings.<\/p>\n<p>Evaluate voltage, current and power limits together. Meeting the RF power rating alone does not guarantee that every other electrical limit is satisfied.<\/p>\n<h3>Cold Switching Recommendations<\/h3>\n<p>NI does not recommend changing relay states while significant RF energy is present. During relay operation, a signal source may briefly experience an unterminated condition that can create damaging reflections.<\/p>\n<p>Remove or reduce the RF signal before switching whenever the test sequence permits. Cold switching also reduces contact stress and helps extend electrical relay life.<\/p>\n<h3>Electromechanical Latching Relays<\/h3>\n<p>The PXI-2558 uses electromechanical latching relays. Electromechanical contacts provide broadband operation extending to DC and typically offer lower insertion loss than comparable solid-state signal paths.<\/p>\n<p>Latching relays maintain their selected state without continuous coil power. Their electrical life depends on the switched voltage, current, RF power, load characteristics and switching conditions.<\/p>\n<h3>Relay-Count Tracking<\/h3>\n<p>Onboard relay-count tracking records switching operations and helps users monitor relay utilization. Maintenance teams can identify heavily used paths before contact wear affects test-system reliability.<\/p>\n<p>Where fixture wiring permits, frequently used routes can be distributed across different banks to balance relay usage and extend the system\u2019s service interval.<\/p>\n<h3>Low Skew and Propagation Delay<\/h3>\n<p>Typical channel-to-channel skew is less than 20 ps, and typical propagation delay is approximately 700 ps. Typical signal rise time is 55 ps.<\/p>\n<p>External cables often introduce more delay and skew than the relay module. Use matched 75 \u03a9 cables when timing consistency between channels is important.<\/p>\n<h3>PXI Hardware Triggering<\/h3>\n<p>The PXI-2558 supports input and output triggers through PXI trigger lines 0 through 7. Hardware triggering allows relay operations to be coordinated with other instruments in the PXI chassis.<\/p>\n<p>Trigger-controlled scan lists can provide more repeatable timing than individual software commands. Allow sufficient relay and instrument settling time before making the associated measurement.<\/p>\n<h3>Typical PXI-2558 Applications<\/h3>\n<ul>\n<li>Cable television equipment testing<\/li>\n<li>Set-top box production testing<\/li>\n<li>Video switch network development<\/li>\n<li>75 \u03a9 RF signal routing<\/li>\n<li>Video source and destination selection<\/li>\n<li>RF analyzer input switching<\/li>\n<li>Broadband tuner testing<\/li>\n<li>Broadcast equipment validation<\/li>\n<li>High-channel-count multiplexer construction<\/li>\n<li>Automated production test systems<\/li>\n<li>Laboratory RF automation<\/li>\n<li>Device-under-test signal selection<\/li>\n<\/ul>\n<h3>Video Switch Networks<\/h3>\n<p>The four independent SPDT banks can add programmable changeover paths to a video switch network. Each relay can select between two video sources or route a common signal toward one of two destinations.<\/p>\n<p>Multiple PXI-2558 modules can be combined when the system requires more switching points. Route planning should account for every relay stage and preserve consistent 75 \u03a9 impedance throughout the network.<\/p>\n<h3>High-Channel-Count Multiplexers<\/h3>\n<p>SPDT relays can be arranged in a tree structure to build multiplexers with additional inputs. This gives system designers flexibility when a standard single-bank multiplexer does not match the required topology.<\/p>\n<p>Cascading relays increases total insertion loss and can reduce isolation. Characterize the longest signal path and ensure that it still satisfies the required RF performance.<\/p>\n<h3>Set-Top Box and Tuner Testing<\/h3>\n<p>The PXI-2558 can switch signals in automated tests for set-top boxes, cable tuners and video receivers. Test software can select RF sources, DUT outputs and analyzer paths without manually moving cables.<\/p>\n<p>Its 75 \u03a9 impedance is compatible with common cable and video equipment. Confirm that any Type-F, BNC or other adapters maintain 75 \u03a9 impedance through the required frequency range.<\/p>\n<h3>NI-SWITCH Software Support<\/h3>\n<p>The PXI-2558 is controlled through the NI-SWITCH instrument driver. NI-SWITCH provides functions for opening and closing relay paths, configuring scan lists, managing triggers and reading relay-count information.<\/p>\n<p>The driver supports LabVIEW, LabWindows\/CVI and compatible text-based programming environments. Relay operations can be integrated directly into automated test sequences.<\/p>\n<h3>NI Switch Executive Integration<\/h3>\n<p>NI Switch Executive allows users to define named routes instead of controlling every relay by its physical channel name. This simplifies development and maintenance in systems containing several RF switch modules.<\/p>\n<p>Meaningful route names can represent sources, instruments, test points and DUT connections. Fixture changes can often be managed within the route configuration without rewriting the complete application.<\/p>\n<h3>PXI Chassis Integration<\/h3>\n<p>The PXI-2558 occupies one slot in a compatible 3U PXI chassis. It can be installed alongside RF analyzers, digitizers, signal generators, controllers and other modular instruments.<\/p>\n<p>Before installation, verify chassis compatibility, available cooling, controller communication and NI-SWITCH support. Provide enough front-panel clearance for all required mini-SMB cables.<\/p>\n<h3>PXI-2558 Troubleshooting<\/h3>\n<h4>The PXI-2558 Is Not Detected in NI MAX<\/h4>\n<p>Confirm that the module is fully seated in a compatible PXI slot. Check chassis power, controller communication and NI-SWITCH installation, then restart NI Measurement &amp; Automation Explorer.<\/p>\n<h4>The Common Port Is Connected to the Wrong Path<\/h4>\n<p>Verify the selected relay bank and whether the application expects the normally open or normally closed connection. Compare the software channel names with the front-panel labels.<\/p>\n<h4>No Signal Appears at the Common Connection<\/h4>\n<p>Check the RF source, selected route, cable continuity and receiving-instrument settings. Inspect the mini-SMB connectors and confirm that the cable is fully engaged.<\/p>\n<h4>Insertion Loss Is Higher Than Expected<\/h4>\n<p>Verify that every cable and adapter is rated for 75 \u03a9 operation and the required frequency. Inspect connectors for damage and measure the total loss of the complete signal path.<\/p>\n<h4>Signal Reflections Are Excessive<\/h4>\n<p>Check for 50 \u03a9 components accidentally installed in the 75 \u03a9 path. Confirm that sources and loads are properly terminated and minimize unnecessary adapters.<\/p>\n<h4>Signals Leak Between Relay Banks<\/h4>\n<p>Inspect external cable routing, shielding and grounding. Separate strong RF sources from sensitive measurement paths and check the fixture for unintended coupling.<\/p>\n<h4>A Relay Does Not Change State<\/h4>\n<p>Verify the commanded relay name and review its operation count. Disconnect external signals and test the bank using a known low-level source. A worn or overstressed relay may require service.<\/p>\n<h4>Relay Life Is Shorter Than Expected<\/h4>\n<p>Check whether relays are being operated with active RF power. Use cold switching where possible and confirm that voltage, current and RF power remain within the specified limits.<\/p>\n<h4>The Fault Timing Is Not Repeatable<\/h4>\n<p>Use PXI hardware triggers and a scan list instead of relying only on host-software timing. Include sufficient relay settling time before initiating the measurement.<\/p>\n<h3>PXI-2558 Comparison with Similar 75 \u03a9 RF Switches<\/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-2554<\/td>\n<td>2.5 GHz, unterminated 4\u00d71 multiplexer<\/td>\n<td>Selecting one of four RF sources or test paths<\/td>\n<\/tr>\n<tr>\n<td>PXI-2555<\/td>\n<td>2.5 GHz, terminated 4\u00d71 multiplexer<\/td>\n<td>Four-channel routing requiring internal termination<\/td>\n<\/tr>\n<tr>\n<td>PXI-2556<\/td>\n<td>2.5 GHz, dual 4\u00d71 multiplexer<\/td>\n<td>Two independent four-channel multiplexers<\/td>\n<\/tr>\n<tr>\n<td>PXI-2557<\/td>\n<td>2.5 GHz, 8\u00d71 multiplexer<\/td>\n<td>Routing eight signals to one common instrument<\/td>\n<\/tr>\n<tr>\n<td>PXI-2558<\/td>\n<td>2.5 GHz, quad SPDT relays<\/td>\n<td>Four independent changeover paths<\/td>\n<\/tr>\n<tr>\n<td>PXI-2559<\/td>\n<td>2.5 GHz, dual terminated SPDT relays<\/td>\n<td>Independent changeover paths requiring termination<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>PXI-2558 vs PXI-2557<\/h3>\n<p>\u0417\u0435\u043c\u043b\u044f <a href=\"https:\/\/pxisource.com\/ru\/product\/pxi-2557\/\">PXI-2557<\/a> provides a single 8\u00d71 multiplexer that connects one of eight inputs to one common port. The PXI-2558 provides four independent SPDT changeover relays.<\/p>\n<p>Choose the PXI-2557 when eight signals must share one instrument. Choose the PXI-2558 when the test system requires four independent two-way switching paths.<\/p>\n<h3>PXI-2558 vs PXI-2559<\/h3>\n<p>The PXI-2558 provides four independent unterminated SPDT relays. The <a href=\"https:\/\/pxisource.com\/ru\/product\/pxi-2559\/\">PXI-2559<\/a> provides two terminated SPDT relay banks.<\/p>\n<p>Select the PXI-2558 when the number of independent switching paths is the priority. Select the PXI-2559 when two paths are sufficient and internal termination of unselected connections is required.<\/p>\n<h3>PXI-2558 vs PXI-2548<\/h3>\n<p>The PXI-2558 and <a href=\"https:\/\/pxisource.com\/ru\/product\/pxi-2548\/\">PXI-2548<\/a> both provide four independent SPDT relays. The PXI-2558 is designed for 75 \u03a9 systems and uses mini-SMB connectors, while the PXI-2548 is designed for 50 \u03a9 systems and uses SMA connectors.<\/p>\n<p>Choose the PXI-2558 for cable television, video and other 75 \u03a9 applications. Choose the PXI-2548 for conventional 50 \u03a9 RF test equipment.<\/p>\n<h3>Recommended Related Products<\/h3>\n<ul>\n<li><a href=\"https:\/\/pxisource.com\/ru\/product\/pxi-2554\/\">PXI-2554 4\u00d71 75 \u03a9 RF Multiplexer<\/a><\/li>\n<li><a href=\"https:\/\/pxisource.com\/ru\/product\/pxi-2555\/\">PXI-2555 Terminated 4\u00d71 75 \u03a9 RF Multiplexer<\/a><\/li>\n<li><a href=\"https:\/\/pxisource.com\/ru\/product\/pxi-2556\/\">PXI-2556 Dual 4\u00d71 75 \u03a9 RF Multiplexer<\/a><\/li>\n<li><a href=\"https:\/\/pxisource.com\/ru\/product\/pxi-2557\/\">PXI-2557 8\u00d71 75 \u03a9 RF Multiplexer<\/a><\/li>\n<li><a href=\"https:\/\/pxisource.com\/ru\/product\/pxi-2559\/\">PXI-2559 Dual Terminated SPDT RF Relay Module<\/a><\/li>\n<li><a href=\"https:\/\/pxisource.com\/ru\/product\/pxi-2548\/\">PXI-2548 Quad SPDT 50 \u03a9 RF Relay 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 75 \u03a9 RF Switch<\/h3>\n<p>Choose the PXI-2558 when the application requires four independent SPDT routes, DC to 2.5 GHz frequency coverage and 75 \u03a9 mini-SMB connectivity. It is particularly suitable for video networks and custom high-channel-count switch architectures.<\/p>\n<p>Select the PXI-2557 when eight channels must connect to one common port. Choose the PXI-2559 when fewer SPDT banks are required and internal termination is important.<\/p>\n<h3>Why Choose the PXI-2558?<\/h3>\n<ul>\n<li>Provides four independently controlled SPDT relays<\/li>\n<li>Supports signals from DC through 2.5 GHz<\/li>\n<li>Maintains 75 \u03a9 impedance for RF and video systems<\/li>\n<li>Offers low insertion loss and good VSWR<\/li>\n<li>Supports 10 W RF switching power<\/li>\n<li>Provides direct mini-75 \u03a9 SMB connectivity<\/li>\n<li>Includes onboard relay-count tracking<\/li>\n<li>Supports PXI hardware triggering<\/li>\n<li>Integrates with NI-SWITCH and NI Switch Executive<\/li>\n<li>Occupies only one PXI chassis slot<\/li>\n<\/ul>\n<h3>Frequently Asked Questions<\/h3>\n<h4>What Is the PXI-2558?<\/h4>\n<p>The PXI-2558 is a 2.5 GHz, 75 \u03a9 PXI RF relay module containing four independent SPDT switching banks.<\/p>\n<h4>What Is the PXI-2558 Part Number?<\/h4>\n<p>The standard NI part number for the PXI-2558 is <strong>778572-58<\/strong>.<\/p>\n<h4>How Many Relays Does It Provide?<\/h4>\n<p>The module provides four independent electromechanical SPDT relays.<\/p>\n<h4>What Is the Maximum Frequency?<\/h4>\n<p>The PXI-2558 supports signals from DC through 2.5 GHz.<\/p>\n<h4>Is the PXI-2558 a 50 \u03a9 or 75 \u03a9 Module?<\/h4>\n<p>The PXI-2558 is designed for 75 \u03a9 video and RF signal systems.<\/p>\n<h4>What Is the Maximum RF Power?<\/h4>\n<p>The maximum RF switching power is 10 W, subject to the module\u2019s 30 V and 0.5 A electrical limits.<\/p>\n<h4>Are the Relay Paths Internally Terminated?<\/h4>\n<p>No. The PXI-2558 uses four standard SPDT relay paths without the terminated architecture provided by the PXI-2559.<\/p>\n<h4>What Connectors Does the PXI-2558 Use?<\/h4>\n<p>The module provides 12 gold-plated mini-75 \u03a9 SMB jacks.<\/p>\n<h4>Does It Use Solid-State Switches?<\/h4>\n<p>No. The PXI-2558 uses electromechanical latching relays.<\/p>\n<h4>Does the Module Track Relay Usage?<\/h4>\n<p>Yes. Onboard relay-count tracking helps users estimate relay wear and plan preventive maintenance.<\/p>\n<h4>Which Software Controls the PXI-2558?<\/h4>\n<p>The module is controlled through NI-SWITCH and can be integrated into named-route applications using NI Switch Executive.<\/p>\n<h4>Is the PXI-2558 Still Available from NI?<\/h4>\n<p>NI lists the PXI-2558 as no longer available for direct purchase. Used, refurbished or new-surplus units may remain available from specialized PXI equipment suppliers.<\/p>\n<h3>Request a Quote for the PXI-2558<\/h3>\n<p>Contact us for current availability, condition, lead time and project pricing for the <strong>PXI-2558 2.5 GHz Quad SPDT 75 \u03a9 PXI RF Relay Module<\/strong>. We can also help identify compatible mini-SMB cables, 75 \u03a9 adapters, PXI chassis and alternative RF switch modules for your test system.<\/p>","protected":false},"excerpt":{"rendered":"<p>PXI-2558 2.5 GHz Quad SPDT 75 \u03a9 PXI RF Relay Module The PXI-2558 is a general-purpose PXI RF relay module<\/p>","protected":false},"featured_media":34816,"template":"","meta":{"_acf_changed":false},"product_brand":[18],"product_cat":[667],"product_tag":[],"class_list":["post-34902","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 v28.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>NI PXI-2558 PXI RF Relay Module 778572-58, In Stock | Project Pricing<\/title>\n<meta name=\"description\" content=\"The PXI-2558 is a 2.5 GHz, 75 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