US Patent: 4,129,828
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| Oscilloscope Pretrigger Circuit
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Patentee:
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| James A. Jindrick (exact or similar names) - Kenosha, WI |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Sep. 28, 1977 |
| Granted: |
Dec. 12, 1978 |
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Stan Schulz
Snap-On Tools Company History
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Description: |
| Vogel, Dithmar, Stotland, Stratman & Levy - patent attorneys
Abstract
The circuit includes a phase-locked loop that produces pulses a fixed number of engine degrees before the ignition signals. These pulses are used to initiate the horizontal sweep of an oscilloscope that displays the ignition pulses. Accordingly, the ignition signals commence not at the beginning of the display where useful information may be lost, but rather a predetermined number of engine degrees later.
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