NAI’s 74SD3 is a conduction-cooled, PMC Synchro/Resolver Measurement Board with up to eight channels. The channels can incorporate up to eight single-speed or four two-speed Synchro/Resolver to Digital Converters with accurate velocity outputs. Each channel is programmable, so it can be set to the desired bandwidth and for either Synchro or Resolver input. This capability is extremely useful for motor control applications which require total control over one of the loop characteristics. The high tracking rate and variable bandwidth of the 74SD3 enables the converters to handle high speeds and acceleration.

The 74SD3 is specifically designed for rugged defense, industrial, and commercial applications. A convection-cooled version of the 74SD2 PMC Board, the 74SD3 is a legacy (mature) product. Please note that support for this product is limited to existing documentation, Software Support Kit (SSK), and drivers.

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Key Features

  • Eight channels for up to eight single-speed or four two-speed converters
  • Synchro/Resolver programmable per channel
  • Requires only +5 VDC
  • 16-bit resolution for single speed (up to 24 bits for two-speed configuration)
  • ±1 arc-minute accuracy
  • Continuous Background Built-in-Test (BIT) with reference and signal loss detection
  • Self-calibrating, removal not required
  • Bandwidth programmable per channel up to 1200 Hz
  • Programmable 2-speed ratios: 2 to 255
  • 400 Hz to 10 kHz operation
  • Tracking rate to 300 RPS (18,000 RPM)
  • Power-On Self-Test (POST)
  • Accurate digital velocity outputs
  • Watchdog timer and soft reset
  • Automatically supports either 5 V or 3.3 V PCI bus
  • Galvanic isolation for all reference and signal inputs
  • Synthetic reference compensates for ±60° phase shift
  • No adjustments or trimming required
  • Part number, S/N, date code, and revision in non-volatile memory
  • Software Support Kit (SSK) and drivers are available
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  • Specification

    Product Resources

    74SD3 A001 Manual