The North Atlantic 540/20 is a precision Synchro/Resolver Bridge for direct measurement of electrical shaft position in synchro and resolver devices. Operating at 400 Hz with reduced accuracy to 5 kHz, this instrument delivers 2 arc-seconds accuracy at its design frequency and 0.0001° resolution across the full 0–360° angular range. The bridge accepts standard line-to-line input levels of 11.8, 26, 90, and 115 Vrms and provides isolated null outputs in either Synchro or Resolver mode, making it suitable for aerospace, military, and industrial control systems that demand high-precision angular feedback.
Technical Specifications
• Accuracy: 2 arc-seconds at 400 Hz; 4 arc-seconds at 1 kHz; 15 arc-seconds at 2 kHz; 60 arc-seconds at 5 kHz
• Resolution: 0.0001°
• Angular Range: 0–360° with direct readout
• Operating Frequency: 400 Hz nominal; reduced accuracy to 5 kHz
• Transformation Ratio: 1:1
• F Rating: 1.8F or 170 Vrms maximum
• Input Impedance: 1 MΩ (at 400 Hz)
• Null Voltage Gradient: 0.485 × EL-L µV/arc sec
• Input Levels: 11.8, 26, 90, 115 Vrms line-to-line
• Dimensions: 3.5″ H × 19″ W × 15.5″ D (88 × 475 × 388 mm)
• Weight: 30 lbs (14 kg)
– Key Features
• Dual-mode operation: Synchro or Resolver configuration
• Isolated inputs and outputs for system integration
• Full 360° measurement with no dead zones
• MIL-S-20708A and MIL-R-21530 compliant
– Typical Applications
• Aircraft attitude and heading reference systems
• Gun turret and antenna positioning
• Navigation and fire control systems
• Industrial servo feedback measurement
– Compatibility & Integration
Designed to measure electrical shaft position of synchros and resolvers as discrete components or within integrated systems. Terminal designations and electrical characteristics conform to MIL-S-20708A (synchros) and MIL-R-21530 (resolvers).
