Stanford Research DB64 Coax Delay

The Stanford Research Systems DB64 Coax Delay is a precision coaxial delay line that introduces calibrated time delays into electrical signals with minimal distortion. It delivers adjustable delays from 0 to 63.5 ns in 0.5 ns increments, making it essential for RF and microwave system synchronization, phase adjustment, timing coincidences, and calibration routines where signal integrity is non-negotiable.

– Technical Specifications

Delay Performance
• Delay range: 0 to 63.5 ns
• Resolution: 0.5 ns increments
• Delay error: ±100 ps or ±0.5% of delay (whichever is greater)
• Control: DPDT switch-selectable delay segments

Signal Characteristics
• Characteristic impedance: 50 Ω
• Internal cable: RG58A/U coaxial segments
• Reflections: Low, achieved through precision component selection and mechanical design
• Switch feed-through: Low for high-speed signal integrity
• Bandwidth: High-bandwidth analog delay capability

Electrical Ratings
• Maximum voltage: 250 Vrms
• Maximum current: 2 A

Physical & Mechanical
• Connectors: BNC input/output
• Dimensions: 8.3″ W × 1.5″ H × 8.0″ D
• Weight: 2 lbs
• Grounding: Chassis lug on rear panel
• Rack mount: Compatible with RM1U accessory (two units per 19″ rack)

– Key Features

• Switch-controlled insertion and removal of calibrated delay segments
• 50 Ω impedance matching minimizes reflections and preserves waveform fidelity
• Low switch feed-through protects signal quality during transitions
• Compact form factor suitable for bench and rack integration
• Robust construction using RG58A/U coaxial cable for reliability

– Typical Applications

• Photomultiplier coincidence timing
• Time-to-amplitude converter setup and adjustment
• RF and microwave phase synchronization
• Signal timing calibration in test systems
• General-purpose adjustable analog delay for high-bandwidth circuits

– Compatibility & Integration

BNC connectors enable seamless integration with standard RF and test equipment. Two DB64 units mount side-by-side in a single 19″ rack using the optional RM1U rack mount accessory.