The Keithley S46T-26 is a modular RF/microwave switch mainframe designed for signal routing in automated test, data acquisition, and process control systems. This platform accommodates various switch card configurations—up to eight terminated SPDT coaxial relays and four multi-pole coaxial relays—enabling frequency coverage from DC to 26.5 GHz. With 32 control channels, GPIB/SCPI interface, and switching performance optimized across the microwave band, the S46T-26 delivers the flexibility and performance required for complex measurement and signal distribution tasks in laboratory and production environments.
## Technical Specifications
• **Frequency Range:** DC to 26.5 GHz
• **Maximum Control Channels:** 32
• **Relay Configuration:** Up to 8 terminated SPDT coaxial relays + 4 terminated multi-pole coaxial relays
• **Supported Relay Types:** SPDT, SP4T, SP6T
• **Maximum Signal Level:** 42 V peak (any terminal to earth)
• **Actuation Time:** SPDT 10 ms max; multi-pole 15 ms max
• **Contact Life:** SPDT 10 million cycles min; multi-pole 2 million cycles min (26.5 GHz)
• **Contact Closure Counter:** 1 per channel, 10 million counts max, non-volatile storage
• **User-Definable Storage:** 32 locations × 68 bytes each
• **Relay Control Lines:** 32 lines, 300 mA sink current per line
## Key Features
• **Insertion Loss:** 0.2 dB (DC–6 GHz) to 0.7 dB (18–26.5 GHz)
• **Isolation:** 70 dB (DC–6 GHz) to 55 dB (18–26.5 GHz)
• **VSWR:** 1.30 (DC–6 GHz) to 1.70 (18–26.5 GHz)
• **GPIB/IEEE-488.2 Control** with SCPI compliance
• **Power:** 100–240 VAC, 50/60 Hz; 120 VA maximum consumption
• **Fuse:** 1.6 A slow blow, 250 V
• **Dimensions:** 89 mm H × 485 mm W × 370 mm D (3.5˝ × 19˝ × 14.563˝)
## Typical Applications
• RF and microwave signal routing in production test
• Multi-channel switching in data acquisition systems
• Process control signal distribution
• Automated measurement system configuration
## Compatibility & Integration
GPIB interface enables direct integration with automated instrumentation systems and ATE platforms. SCPI command set supports standard programming workflows and system-level control.
