Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Gaseous discharge
Patent
1992-10-01
1995-05-02
Nguyen, Vinh
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Gaseous discharge
324115, 345 39, G01R 1900, G01R 2900
Patent
active
054123127
ABSTRACT:
A volt/frequency meter includes LED arrays which provide bar-graph style meter displays of the instantaneous voltage and the frequency of a variable electric analog signal. Each LED in the voltage array corresponds to a predetermined voltage range and each LED in the frequency array corresponds to a predetermined frequency range. The meter is switchable among three different voltage scales and three different frequency scales. A separate LED flashes momentarily in response to the input signal crossing a user-determined limit set point which is adjusted through a knob on the front panel. The limit set point controls the operation of the frequency display such that the displayed frequency is the rate at which the analog signal crosses the limit set point.
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Braun Robert D.
Crass Matthew M.
Nguyen Vinh
Snap-on Incorporated
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