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SADEH, MAEDER, AND SUTERA investigation!O is a modified and improved version of a mixed mode unit conceived, designed, and built at Brown University.u This is a fully transistorized system which can be operated in either the CT or CC mode. The frequency response of this system is flat from de to beyond 100 kHz. Its signal-to-noise ratio is greater than 10 over the entire operational range and it has excellent stability. The turbulence intensity can be measured with a resolution better than 0.1% of the mean velocity. If second order terms in t:J.I are neglected, the error depends only on the ratio t:J.I/Io. The error decreases with this ratio. For M/Io=O.l, the error is about 5%, while for M/Io=0.05, it is about 2.5%.A practical technique is described for high sensitivity recording of input signals having a large dynamic range. The circuit senses when the input signal exceeds preset limits and applies a precise and stable baseline shift in the correct sense to maintain the output within these limits. The circuit may be regarded as a black box to be inserted between an analog signal source and a recording device and requiring no alteration to either. A system is presented in detail which permits recording of signals within the range -S.4 to +6.1 Von a recorder at 1.0 V full scale sensitivity. The drift introduced by this system is maintained at less than 1 mV;oC over a wide ambient temperature range. A discussion of the sources of error is presented and techniques for reducing these errors are described.
SADEH, MAEDER, AND SUTERA investigation!O is a modified and improved version of a mixed mode unit conceived, designed, and built at Brown University.u This is a fully transistorized system which can be operated in either the CT or CC mode. The frequency response of this system is flat from de to beyond 100 kHz. Its signal-to-noise ratio is greater than 10 over the entire operational range and it has excellent stability. The turbulence intensity can be measured with a resolution better than 0.1% of the mean velocity. If second order terms in t:J.I are neglected, the error depends only on the ratio t:J.I/Io. The error decreases with this ratio. For M/Io=O.l, the error is about 5%, while for M/Io=0.05, it is about 2.5%.A practical technique is described for high sensitivity recording of input signals having a large dynamic range. The circuit senses when the input signal exceeds preset limits and applies a precise and stable baseline shift in the correct sense to maintain the output within these limits. The circuit may be regarded as a black box to be inserted between an analog signal source and a recording device and requiring no alteration to either. A system is presented in detail which permits recording of signals within the range -S.4 to +6.1 Von a recorder at 1.0 V full scale sensitivity. The drift introduced by this system is maintained at less than 1 mV;oC over a wide ambient temperature range. A discussion of the sources of error is presented and techniques for reducing these errors are described.
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