PXI-2547 2.7 GHz 8×1 PXI RF Multiplexer Switch Module
The PXI-2547 is a 2.7 GHz, 50 Ω PXI RF multiplexer switch module designed for automated RF testing, signal routing and multidevice validation. Its 8×1 topology allows one common RF connection to be routed to any of eight independent channels.
The module combines gold-plated SMA connections with low insertion loss, controlled VSWR and high isolation to minimize signal degradation. It is well suited for connecting multiple devices under test to one RF analyzer, signal generator, power meter or other RF instrument.
Key Features of the PXI-2547
- Single-bank 8×1 RF multiplexer topology
- DC to 2.7 GHz switching bandwidth
- 50 Ω nominal characteristic impedance
- Eight RF channels and one common connection
- Nine gold-plated SMA female connectors
- 30 V maximum switching voltage
- 0.5 A maximum switching or carry current
- 10 W maximum RF switching power
- Less than 2 dB insertion loss through 2.7 GHz
- Less than 1.6 VSWR through 2.7 GHz
- Greater than 36 dB typical isolation through 2.7 GHz
- Less than 15 ps typical channel-to-channel skew
- 1.3 ns typical propagation delay
- 93 ps typical rise time
- Latching electromechanical RF relays
- Onboard relay-count tracking
- PXI hardware trigger support
- NI-SWITCH and NI Switch Executive compatibility
PXI-2547 Technical Specifications
| Product Model | PXI-2547 |
|---|---|
| Part Number | 778572-47 |
| Product Type | PXI RF multiplexer switch module |
| Topology | 8×1 multiplexer, SP8T |
| Number of Banks | 1 |
| Number of Channels | 8 |
| Common Connections | 1 |
| Frequency Range | DC to 2.7 GHz |
| Characteristic Impedance | 50 Ω nominal |
| Maximum Switching Voltage | 30 V |
| Maximum Switching Current | 0.5 A per channel |
| Maximum Carry Current | 0.5 A per channel |
| Maximum RF Power | 10 W |
| Minimum Switch Load | 0 dBm |
| Initial DC Path Resistance | Less than 0.25 Ω, typical |
| End-of-Life Path Resistance | 1 Ω or greater, typical |
| Insertion Loss Through 1 GHz | Less than 1.05 dB; less than 0.7 dB typical |
| Insertion Loss Through 2.7 GHz | Less than 2 dB; less than 1.6 dB typical |
| VSWR Through 1 GHz | Less than 1.4; less than 1.15 typical |
| VSWR Through 2.7 GHz | Less than 1.6; less than 1.35 typical |
| Isolation Through 1 GHz | Greater than 48 dB, typical |
| Isolation Through 2.7 GHz | Greater than 36 dB, typical |
| Channel-to-Channel Skew | Less than 15 ps, typical |
| Propagation Delay | 1.3 ns, typical |
| Rise Time | 93 ps, typical |
| Maximum Relay Operate Time | 10.4 ms |
| Maximum Scan Rate | 45 channels/s |
| Mechanical Relay Life | 1 × 106 cycles |
| Electrical Relay Life | 3 × 105 cycles at 30 V, 10 mA resistive |
| Relay Type | Electromechanical, latching |
| Input Trigger Sources | PXI trigger lines 0 through 7 |
| Minimum Input Trigger Pulse Width | 150 ns with digital filtering enabled |
| Output Trigger Destinations | PXI trigger lines 0 through 7 |
| Output Trigger Pulse Width | Programmable from 1 µs to 62 µs |
| Front-Panel Connectors | 9 gold-plated SMA female connectors |
| Bus Connection | PXI Hybrid |
| Module Format | 3U, one-slot PXI/cPCI module |
| Dimensions | 21.6 cm × 2.0 cm × 13.0 cm |
| Weight | 255 g |
| Operating Temperature | 0°C to 55°C |
| Storage Temperature | -20°C to 70°C |
| Software Support | NI-SWITCH and NI Switch Executive |
PXI-2547 Part Number and Accessories
| Item | Part Number | Description |
|---|---|---|
| PXI-2547 | 778572-47 | 2.7 GHz, 50 Ω, 8×1 PXI RF multiplexer switch module |
| SMA 100 Flexible Cable | 763443-01 | 0.15 m SMA male-to-SMA male flexible RF cable |
| SMA 100 Flexible Cable | 763444-01 | 0.45 m SMA male-to-SMA male flexible RF cable |
| MCX-to-SMA Cable | 188377-0R3 | 0.3 m MCX plug-to-SMA plug RF cable |
| MCX-to-SMA Cable | 188377-01 | 1 m MCX plug-to-SMA plug RF cable |
| SMA 50 Ω Termination | 778353-01 | 50 Ω SMA termination plug for unused RF connections |
| SMA Torque Wrench | 187106-01 | Torque wrench for installing SMA connectors correctly |
| SMA-to-SMB Adapter | 779674-01 | SMA plug-to-SMB jack RF adapter |
The PXI-2547 has nine front-panel SMA connectors: eight channel connections labeled CH0 through CH7 and one common connection. Use impedance-matched 50 Ω cables, connectors, adapters and terminations throughout the RF signal path.
8×1 RF Multiplexer Architecture
The PXI-2547 contains one 8×1 multiplexer bank. Software connects the common terminal to one of eight available RF channels.
This topology can route eight RF sources to one receiver or one source to eight different loads and devices under test. Only one channel should normally be connected to common at a time.
The module is particularly useful when several DUT outputs must be measured by one RF analyzer or when one signal generator must stimulate several DUT inputs sequentially.
SP8T Switching Topology
The 8×1 topology is also described as a single-pole eight-throw or SP8T configuration. The common connection acts as the pole, while CH0 through CH7 provide the eight possible throws.
This architecture avoids the need to cascade several smaller switch modules. Reducing the number of relays and cables in the active path can help limit insertion loss, mismatch and propagation delay.
DC to 2.7 GHz Frequency Coverage
The PXI-2547 can route signals from DC through 2.7 GHz. This frequency range supports many RF validation, wireless test, communications and general-purpose signal-routing applications.
RF performance varies with frequency. Insertion loss increases and isolation generally decreases as the operating frequency approaches the upper limit.
The complete system bandwidth also depends on cables, adapters, connectors, source impedance and load impedance.
50 Ω RF Signal Path
The PXI-2547 has a nominal characteristic impedance of 50 Ω, matching the standard impedance used by most RF generators, analyzers, power meters and communication test equipment.
All external components should also have a 50 Ω characteristic impedance. Mixing 50 Ω and 75 Ω equipment can increase signal reflection, degrade VSWR and produce measurement errors.
Nonterminated RF Architecture
The PXI-2547 does not include internal 50 Ω terminations on its inactive channels. Unused channels remain unterminated unless external termination plugs are installed.
External 50 Ω terminations may be required when unused ports could reflect RF energy or when the test architecture depends on a defined impedance at inactive DUT connections.
Termination requirements should be determined from the RF source, DUT and measurement-system design.
Insertion Loss Performance
Insertion loss measures the RF signal power lost as it passes through the selected channel and common connection. Lower insertion loss preserves more of the original signal amplitude.
Through 1 GHz, specified insertion loss is less than 1.05 dB, with a typical value below 0.7 dB. Through 2.7 GHz, insertion loss is less than 2 dB, with a typical value below 1.6 dB.
Total system loss also includes coaxial cables, adapters, connectors and any additional RF switches in the signal path. These losses should be included in measurement correction or calibration.
VSWR Performance
Voltage standing wave ratio indicates the level of impedance mismatch and reflected power within the RF signal path. A value closer to 1 indicates a better impedance match.
The PXI-2547 has specified VSWR below 1.4 through 1 GHz and below 1.6 through 2.7 GHz. Typical values are below 1.15 and 1.35 respectively.
Correct connector torque, clean SMA interfaces and suitable cables help the complete system maintain good VSWR performance.
RF Isolation
Isolation describes how effectively the switch prevents signals on unselected channels from coupling into the active channel.
Typical isolation is greater than 48 dB through 1 GHz and greater than 36 dB through 2.7 GHz. Higher isolation reduces leakage between DUTs and helps protect low-level measurements from unwanted RF signals.
External cable routing and fixture shielding also influence system-level isolation.
Channel-to-Channel Skew
The PXI-2547 provides typical channel-to-channel skew below 15 ps. Low skew helps maintain consistent timing when the same signal is routed through different multiplexer channels.
Cable-length differences outside the module may create significantly more skew than the internal switch path. Use phase-matched or equal-length cables when timing consistency is important.
Propagation Delay and Rise Time
The module has a typical propagation delay of 1.3 ns and a typical 10% to 90% rise time of 93 ps.
Propagation delay should be included when precise timing alignment is required between switched and unswitched RF paths. The complete delay includes cables, adapters and other components.
10 W RF Power Handling
The maximum RF power is 10 W. Channel-to-common switching power must not exceed this limit and must also remain within the 30 V and 0.5 A electrical ratings.
RF power capability depends on signal type, frequency, impedance match and switching conditions. Confirm peak as well as average power for pulsed RF signals.
30 V and 0.5 A Ratings
The PXI-2547 supports a maximum switching voltage of 30 V and a maximum switching or carry current of 0.5 A per channel.
These electrical ratings apply together with the 10 W maximum power limit. The module should not be used for circuits exceeding any individual voltage, current or power specification.
Switching Active RF Signals
NI recommends avoiding switching active RF signals whenever possible. During relay operation, the RF channel is momentarily unterminated, which can create reflections toward the source.
Some RF signal generators and power amplifiers can be damaged when their outputs experience severe mismatch. Reduce or disable RF output power before changing relay routes when the source documentation requires it.
Switching active signals below the specified minimum load may also degrade signal integrity and reduce relay life.
Latching Electromechanical Relays
The PXI-2547 uses latching electromechanical RF relays. A latching relay retains its selected position without requiring continuous coil power.
This reduces steady-state power consumption and internal heating. Because the relay can retain its state, the software should explicitly disconnect or initialize the switch route during system startup.
Relay Operating Time and Scan Rate
Maximum relay operating time is 10.4 ms, and the maximum scan rate is 45 channels per second.
Actual test throughput also depends on RF source settling, instrument acquisition time, relay settling and DUT response. Allow sufficient stabilization time after switching before recording a measurement.
Relay-Count Tracking
Onboard relay-count tracking records the number of operations performed by the RF relays. This helps maintenance teams estimate relay usage and identify channels approaching their expected service life.
Relay counts can support preventive maintenance, route balancing and scheduled replacement before contact degradation causes unexpected system downtime.
PXI Hardware Triggering
The PXI-2547 supports input and output triggers through PXI trigger lines 0 through 7. Hardware triggering allows relay operations to be synchronized with other instruments in the PXI system.
The minimum input-trigger pulse width is 150 ns with digital filtering enabled. Output-trigger pulse width can be programmed from 1 µs to 62 µs.
Typical PXI-2547 Applications
- Automated RF signal routing
- Wireless device production testing
- RF component validation
- Multiple-DUT RF testing
- Antenna signal selection
- RF analyzer input selection
- Signal generator output routing
- Power meter channel selection
- Receiver sensitivity testing
- Transmitter output testing
- RF calibration systems
- Communications equipment testing
- Laboratory RF automation
Multiple-DUT RF Testing
The PXI-2547 can connect as many as eight DUT outputs to one RF analyzer input. Test software selects each device sequentially and records its measurement results.
This configuration reduces the number of analyzers required in a production test system and helps increase instrument utilization.
RF Analyzer Input Selection
Eight RF sources or DUT signals can be routed to the common connection of a spectrum analyzer, vector signal analyzer or RF power meter.
Measurement correction should account for the insertion loss of the selected switch path and external cable assembly.
Signal Generator Output Routing
The common connection can receive a signal from an RF generator and route it to one of eight DUT inputs. This allows one generator to stimulate multiple devices or test points sequentially.
Disable or reduce the generator output before changing routes when required to protect the source from transient mismatch.
Wireless Production Testing
Production systems can use the PXI-2547 to share RF instruments between several test fixtures or DUT positions. Software-controlled switching eliminates many manual coaxial cable changes.
Relay-count tracking helps maintenance teams identify heavily used routes and plan service before the RF path becomes unreliable.
Antenna and Receiver Testing
The module can select among several antennas, receiver inputs or test signals. Its low insertion loss and controlled impedance help preserve RF performance through the switching path.
For sensitive receiver testing, account for switch loss when determining the actual signal level delivered to the DUT.
NI-SWITCH Software Support
The PXI-2547 is controlled through the NI-SWITCH instrument driver. NI-SWITCH provides functions for initializing the module, connecting channels to common, disconnecting routes, configuring scans and controlling triggers.
The driver supports LabVIEW, LabWindows/CVI and compatible text-based programming environments. It can also be integrated into NI TestStand automated test sequences.
NI Switch Executive Integration
NI Switch Executive allows engineers to define meaningful route names instead of managing physical relay connections directly in application code.
Named routes simplify systems containing several RF switches, signal generators, analyzers and DUT interfaces. Route validation can also help prevent conflicting connections.
PXI Chassis Integration
The PXI-2547 occupies one slot in a compatible PXI or PXI hybrid-slot chassis. It can operate alongside RF instruments, digitizers, signal generators and other NI PXI modules.
Before installation, verify chassis compatibility, controller communication, cooling, SMA cable clearance and the installed NI-SWITCH software version.
PXI-2547 Troubleshooting
The PXI-2547 is not detected in NI MAX
Confirm that the module is fully installed in a compatible PXI slot. Check chassis power, controller communication and NI-SWITCH installation, then restart NI Measurement & Automation Explorer.
The common connection does not receive a signal
Verify that the correct channel is connected to COM. Check the SMA cables, connector torque, source output and analyzer configuration. Test the route at a lower frequency if necessary.
Insertion loss is higher than expected
Inspect cables, adapters and SMA connectors for damage, contamination or incorrect torque. Confirm that all components are rated for 2.7 GHz and include their losses in the system calculation.
VSWR is too high
Confirm that the complete signal path uses 50 Ω components. Check for loose connectors, damaged cables, mixed-impedance equipment and unterminated ports.
Isolation between channels is insufficient
Review cable routing, fixture shielding and grounding. Separate input and output cables physically and inspect the selected route for unintended external coupling.
The RF source becomes unstable during switching
Disable or reduce the RF output before changing routes. The selected path is momentarily unterminated during relay operation, which can create a high reflection toward the source.
Measurements vary between channels
Compare external cable length, insertion loss and connector condition for every channel. Apply channel-specific path-loss correction when necessary.
The scan rate is lower than expected
Review relay settling, RF source stabilization, measurement acquisition time and software execution. The 45-channel/s specification does not include every delay in the complete test sequence.
A channel becomes intermittent
Inspect the SMA connector and cable first, then check the relay count and path resistance. A heavily used relay may require module service or replacement.
PXI-2547 Comparison with Similar RF Switch Modules
| Model | Primary Configuration | Best Suited For |
|---|---|---|
| PXI-2545 | 50 Ω terminated RF multiplexer | Applications requiring internal termination on inactive channels |
| PXI-2546 | Dual-bank RF multiplexer architecture | Routing two independent groups of RF signals |
| PXI-2547 | 2.7 GHz, 50 Ω, single-bank 8×1 multiplexer | Connecting eight RF signals or DUTs to one instrument |
| PXI-2548 | 2.7 GHz quad SPDT RF relay module | Four independent two-way RF changeover paths |
| PXIe-2543 | Higher-frequency PXI Express RF multiplexer | Applications requiring greater RF bandwidth |
PXI-2547 vs PXI-2548
The PXI-2547 provides one 8×1 multiplexer bank, while the PXI-2548 provides four independent SPDT RF relays.
Choose the PXI-2547 when eight signals must share one RF instrument. Choose the PXI-2548 when the system requires several independent two-way RF changeover paths.
PXI-2547 vs PXI-2545
The PXI-2547 does not include internal 50 Ω terminations on inactive channels. The PXI-2545 is more appropriate when the test architecture requires terminated unused RF paths.
Choose the PXI-2547 when an unterminated 8×1 multiplexer provides the required routing and maximum channel density.
PXI-2547 vs PXIe-2543
The PXI-2547 supports frequencies through 2.7 GHz and uses the PXI bus interface. The PXIe-2543 is intended for higher-frequency RF switching in PXI Express systems.
Select the module according to required frequency, topology, connector type, chassis interface, insertion loss and isolation.
Recommended Related Products
- PXI-2545 Terminated RF Multiplexer Switch Module
- PXI-2546 RF Multiplexer Switch Module
- PXI-2548 Quad SPDT RF Relay Module
- PXIe-2543 High-Frequency RF Multiplexer Module
- View More NI PXI and PXI Express Modules
Selecting the Right PXI RF Switch
Choose the PXI-2547 when the application requires one 8×1 RF multiplexer, DC-to-2.7 GHz coverage, 50 Ω impedance and SMA connections. It is particularly well suited for connecting eight DUTs or RF signals to one shared instrument.
Select a terminated multiplexer when inactive ports require a defined 50 Ω load, an SPDT module for independent two-way routes or a higher-frequency PXI Express switch when operation beyond 2.7 GHz is required.
Why Choose the PXI-2547?
- Routes eight RF channels to one common connection
- Supports signals from DC through 2.7 GHz
- Maintains 50 Ω characteristic impedance
- Offers low insertion loss and controlled VSWR
- Provides high isolation between selected and unselected paths
- Uses nine convenient SMA front-panel connectors
- Handles RF power up to 10 W
- Includes onboard relay-count tracking
- Supports PXI hardware triggering
- Integrates with NI-SWITCH and NI Switch Executive
Frequently Asked Questions
What is the PXI-2547?
The PXI-2547 is a 2.7 GHz, 50 Ω, 8×1 PXI RF multiplexer used to route eight RF signals or devices to one common instrument connection.
What is the PXI-2547 topology?
It provides one 8×1 multiplexer bank, also described as an SP8T RF switching topology.
What frequency range does the PXI-2547 support?
The PXI-2547 routes signals from DC through 2.7 GHz.
What is the characteristic impedance?
The module has a nominal characteristic impedance of 50 Ω.
Does the PXI-2547 terminate unused channels?
No. It does not include internal 50 Ω termination on inactive channels. External termination plugs can be used when required.
What is the maximum RF power?
The maximum RF power is 10 W, subject to the 30 V and 0.5 A limits.
What is the insertion loss at 2.7 GHz?
Insertion loss is specified below 2 dB through 2.7 GHz, with a typical value below 1.6 dB.
What is the VSWR at 2.7 GHz?
VSWR is specified below 1.6 through 2.7 GHz, with a typical value below 1.35.
What connectors does the PXI-2547 use?
The front panel provides nine gold-plated SMA female connectors: eight channels and one common connection.
Should active RF signals be switched?
NI recommends avoiding active RF switching when possible because the signal path is momentarily unterminated during relay operation.
Which software controls the PXI-2547?
The module is controlled through NI-SWITCH and can be integrated into named-route applications using NI Switch Executive.
What is the PXI-2547 part number?
The standard NI part number for the PXI-2547 is 778572-47.
Request a Quote for the PXI-2547
Contact us for current availability, lead time and project pricing for the PXI-2547 2.7 GHz 8×1 PXI RF Multiplexer Switch Module. We can also help identify compatible SMA cables, 50 Ω terminations, adapters, PXI chassis and related NI RF switch modules for your automated test system.
