The Ametek/VTI Instruments SM7274N is a Single Pole Six Throw (SP6T) non-latching relay switch module engineered for high-frequency signal routing in VXIbus systems. Built on Narda relay technology, this C-size, single-slot VXI module delivers high isolation and low insertion loss across DC to microwave frequencies. The modular design enables flexible front-pluggable configuration within VXIbus platforms, making it ideal for test systems requiring reliable RF switching with minimal signal degradation.
Technical Specifications
Switch Configuration & Control
• Single Pole Six Throw (SP6T) topology
• Non-latching operation
• Actuating voltage: 12, 24, or 28 Vdc
• Switching speed: 15 ms (typical for Narda SEM models)
• TTL-compatible logic with suppression diodes
• DC resistance (switch body to terminal/indicator): >10 MΩ @ 500 V
RF Performance
• Frequency range: DC to 18 GHz or DC to 26.5 GHz (configuration dependent)
• High isolation across operating band
• Low insertion loss
• VSWR tested for reliable operation
• Self-termination available on unused RF ports (50 Ω load)
Indicator & Status
• Isolated indicator circuitry for direct status reading via VXI backplane
• Relay position determinable post power-cycle
– Key Features
• C-size, single-slot VXI module form factor
• Narda electro-mechanical relay switching technology
• Pluggable front-access design for field configuration and repair
• Modular architecture compatible with mixed switch configurations
• Isolated indicator circuitry tied to VXI backplane protocol
– Typical Applications
High-frequency signal routing in test and measurement systems requiring switching from DC through microwave bands with maintained signal integrity. Suited for applications demanding high port isolation and predictable insertion loss across broad frequency spans.
– Compatibility & Integration
Part of the VXI Technology SM7000 Series microwave switching modules. Integrates within the SMIP™ (Switch Module Interface Platform) family and VXIbus architecture. Compatible with systems supporting TTL control signaling and VXI backplane indicator reporting.
