The Tektronix SD-24 is a dual-channel digital sampling head that extends the capabilities of compatible Tektronix sampling oscilloscopes and signal analyzers. Operating at 20 GHz equivalent bandwidth with 17.5 ps or less rise time, it delivers high-fidelity acquisition of fast transient signals. Each channel integrates a step generator for Time Domain Reflectometry, enabling differential and common-mode characterization of transmission lines, coupled line analysis, and crosstalk measurement. The TDR reflected rise time is 35 ps or less, with independently selectable step polarity on each channel. Both channels employ 50 Ohm internal termination and precision 3.5 mm connectors.
– Technical Specifications
• Bandwidth: 20 GHz equivalent
• Rise Time (Acquisition): 17.5 ps or less
• Rise Time (TDR Reflected): 35 ps or less
• Channels: Dual-channel
• Internal Termination: 50 Ohms
• Connectors: Two precision 3.5 mm connectors per channel for signal input and step output
– Key Features
• Integrated TDR capability on each channel with independently selectable step polarity
• Step generators support both negative-going and positive-going outputs
• Variable delay on second channel for timing alignment between step outputs
• Modular design slides into front-panel compartments of compatible mainframes
• Requires instrument ON/STANDBY switch set to STANDBY during installation and removal
• Lock-down screw secures unit in place
– Typical Applications
• Differential and common-mode TDR testing
• Coupled transmission line characterization
• Independent isolated line analysis
• Crosstalk measurement and qualification
• High-speed signal acquisition and transient analysis
– Compatibility & Integration
The SD-24 interfaces with Tektronix 11800 Series oscilloscopes, 11801A/11801B/11801C, 11802, CSA803C, CSA803A, and the SM-11 Multi-Channel Unit. ESD precautions are mandatory—use a wrist strap during handling and connector operations.
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