DDC HSR-203 Synchro and Resolver Angle Indicator

The DDC SR-203 / HSR-203 Synchro and Resolver Angle Indicators are improved high quality angle indicators used in precision synchro and resolver test equipment. They accept synchro or resolver signals from a front panel input channel or either of two rear connector input channels. output data, formatted to BCD angle information, is provided and displayed on the front panel. both models are enclosed bench-type instruments, with a carry handle, which may be used as a tilt stand. Control functions, such as input channel select, input type, bandwidth, unipolar/bipolar, lamp test and inhibit, may be controlled either manually by front panel switches or remotely with control logic to the rear connector. A single switch multiplexes control between local and remote sources and front panel and rear connector input channels. An internal IEEE-488 data bus interface is available as an option.

The SR-203 and HSR-203 instruments differ only in their accuracy and resolution. The SR-203 is accurate to ± 0.03°, while the HSR-203 is accurate to ± .005°. Resolution for the devices is ± 0.01° and ± 0.001° respectively. Because they can accept a broad range of voltages and frequencies, without programming, and signal to reference phase shifts of ± 50° (max), the SR-203 and HSR-203 are ideal for situations where a variety of inputs must be quickly accommodated. Using a type II servo loop for continuous tracking, these instruments have no velocity lag up to the specified tracking rates.There can be no hangup 180° away from the input angle. A fault indicator shows when the unit is not tracking the input signal, and an ambiguity indicator shows when the output data is changing.

The SR-203 and HSR-203 require no adjustments or calibrations, and logic is TTL compatible. The SR-203 and HSR-203, in addition to serving as high performance bench instruments, can be used wherever accurate angle information is required for display, control, testing purposes, or computation. Applications include production testing of synchros and resolvers, information translators in quality control systems, machine tool control, ship and aircraft navigation systems, and antenna positioning. The IEEE-488 adapter option is convenient for interfacing these units with other instruments for automatic test equipment.