Automatic Level Measuring System for Frequencies Between 200 Hz and 100 MHz

An automatic level measuring system is described allowing selective voltage and voltage difference measurements with very high accuracy and high measuring speed in a frequency range of 200 Hz to 2 MHz or 10 kHz to 100 MHz. The system includes devices for measuring the reflection coefficient as well as multipoint scanners with low insertion loss and high crosstalk attenuation. All essential functions of the system can be remotely controlled and programmed. The system has a range of 150 dB. The attainable accuracy at absolute measurements is approximately 0.1 dB while the resolution for difference measurements amounts to 0.01 dB. The frequency error is smaller than 5 ?? 10^-8. The results are digitally displayed and are also available as binary coded decimal (BCD) signals. To control the system and to evaluate the results (e.g., comparison with present tolerance limits, classification quality ranges), a fixed-program small computer is provided that can be fed with additional information from a punched tape or core memory. The measuring sets will most frequently be used in development, production, and maintenance areas in the field of telecommunications, but are also of general interest where high accuracy combined with high measuring speed is essential. Attainable time saving depends on the problem in question and may be of the order of 10-100.