Automotive engine analyzer for indicating a no-connection condition of engine test leads
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United States of America Patent
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Jun 29, 1982
Grant Date -
N/A
app pub date -
Apr 15, 1980
filing date -
Apr 15, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A voltage divider network comprising three series connected resistors serve to reference a test signal lead connectable to an internal combustion engine, with respect to ground for providing a voltage test signal on an output conductor representative of test data to be retrieved from the engine. Whenever the test signal lead is disconnected from the engine, the voltage divider network provides a non-zero voltage level on the output conductor, having a magnitude lying without a predetermined voltage range of possible test signals. A signal processing circuitry analyzes the test signals for providing a visual analysis display for the operator of the analyzer, and further is responsive to the aforesaid non-zero voltage level for blanking the portion of the visual display which is reserved for displaying analysis data.
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