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This paper describes an automated parallel IF substitution system for precision attenuator calibration which has been in use for over 15 years and presents results of tests made on some very accurate attenuators.
The calibration system was originally developed to meet the calibration needs of a step attenuator in a new synthesizer. Years of data have shown this attenuator to have phenomenal accuracy. The system has been continually refined and is now used for high-accuracy calibration of several other types of step attenuators. The data presented establishes confidence in the accuracy of the system and the attenuators.
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