Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Nonquantitative
Patent
1975-03-24
1977-03-08
Strecker, Gerard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Nonquantitative
324 51, G01R 3102, G01R 1916
Patent
active
040115089
ABSTRACT:
A probe for testing logic signals or the like occurring in electric circuits and for indicating whether such signals are at low, intermediate or high level or that an open circuit exists in the tested circuit includes first and second parallel connected display portions, the former having a first liquid crystal indicator in series with a battery the latter including a second liquid crystal. The first liquid crystal is normally energized when the difference between the battery voltage and the received signal being tested exceeds the threshold level thereof, and the second liquid crystal is normally energized when the voltage of the received signal being tested exceeds the threshold level thereof, such energization indicating whether the tested signal is at high or low level. De-energization of both liquid crystals indicates that the tested signal is at an intermediate level, also known as the deadband region between low and high level signals, or that an open circuit exists in the tested circuit.
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Lyons et al., Light-Emitting Diode Circuit IBM Technical Disclosure Bulletin vol. 14 No. 12 May 1972 p. 3580.
Watson, S. G., Polarity Reversing Test Probes IBM Technical Disclosure Bulletin vol. 16 No. 3 Aug. 1973 p. 836.
A & P Products Incorporated
Strecker Gerard R.
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