DDC SR-103 Synchro / Resolver Angle Indicator

The DDC SR-103 Synchro/Resolver Angle Indicator converts analog synchro or resolver signals into precise digital angle representations displayed on the front panel and output via BCD logic. This zero-adjustment instrument employs a Type II servo loop for continuous tracking without velocity lag, accommodating signal-to-reference phase shifts up to ±50°. It automatically adjusts to reference levels of 10-150 V and adapts to incoming signal levels without requiring voltage or frequency programming. The unit features transformer isolation on signal and reference inputs, fault and ambiguity monitoring, and TTL-compatible logic output. Fault indication alerts operators when the device loses lock on the input signal; ambiguity indication marks periods when output data is changing. Available in portable, half-rack, and 19-inch rack mount configurations, the SR-103 integrates directly with digital control systems via BCD rear-panel output and accepts optional IEEE-488 bus adapters for automated test environments.