Field test instrument

Details Field test instrument Field test instrument

1992-03-13

1993-07-06

Wieder, Kenneth A.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324161, 324 7641, 324 7655, 324 7682, 377 29, H03K 2130, G07B 1300

Patent

active

052257681

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.

REFERENCES:
patent: 4220996 (1980-09-01), Searcy
patent: 4326173 (1982-04-01), Newman
patent: 4513448 (1985-04-01), Maher
patent: 4692933 (1987-09-01), Wroblewski

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