AA 501A Distortion Analyzer Service Manual

Comprehensive service manual for the Tektronix AA 501A Distortion Analyzer, covering both standard configuration and optional measurement capabilities. This fully automatic distortion analyzer measures total harmonic distortion (THD) as core functionality. Option 01 adds SMPTE/DIN intermodulation distortion and CCIF two-tone difference frequency distortion measurements. Option 02 enables noise measurements compliant with CCIR recommendation 468-2 and DIN 45405 standards. The instrument features automatic distortion set level, frequency tuning, and nulling that require no operator adjustment. Functions include high sensitivity audio frequency voltmeter capabilities with readings in volts, dBm, or dB ratio. The workshop manual provides complete operating instructions, theoretical operation principles, calibration procedures, performance checks, and maintenance guidelines for routine upkeep. Technical specifications detail electrical characteristics, environmental conditions, and physical dimensions. Repair and troubleshooting sections include detailed diagnostic aids, circuit board illustrations, and component replacement information necessary for qualified service technicians to maintain and restore the instrument to specification.