Field test instrument
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United States of America Patent
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Jul 6, 1993
Grant Date -
N/A
app pub date -
Mar 13, 1992
filing date -
Mar 13, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A calibration generator for furnishing signals to tachographs, taximeters and other instruments used in fleet management systems. Calibrated frequencies and amplitudes are provided by the generator of the invention. A PLL controlled synthesizer, driven by a crystal oscillator, supplies frequencies under control from the operator. An alternative continuously controlled oscillator is also available for tests.
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