Hand-held ignition voltage tester
OwnerSurender K. Makhijainventor
Life of this patent
Estimating the term…
Abstract
A hand-held ignition voltage tester for detecting voltage on a spark plug wire in an ignition system, such as a distributorless ignition system. The tester includes a housing, positive and negative power cables and a capacitive probe for capacitively coupling to the spark plug wire. The capacitive probe generates a voltage signal which is representative of the voltage on the spark plug wire. A plurality of voltage level indicators are mounted to the housing to form a bar graph, with each indicator corresponding to a selected voltage level. A measurement circuit is coupled to the power cables and the capacitive probe for activating the voltage level indicators in response to the voltage signal.
Claims15
A hand-held ignition voltage tester for detecting voltage on a spark plug wire in a distributorless ignition system, the tester comprising:
- a housing;
- an input terminal for receiving a voltage signal representative of the voltage on the spark plug wire;
- a plurality of light emitting diodes (LEDs) mounted to the housing, each LED corresponding to a selected voltage level;
- an input circuit comprising an input coupled to the input terminal to receive the voltage signal, a measurement output and an absolute value circuit coupled between the input and the measurement output;
- and
- a measurement circuit coupled between the measurement output and the LEDs for selectively lighting the LEDs in response to the measurement output.
A hand-held ignition voltage tester for detecting voltage on a spark plug wire in a distributorless ignition system, the tester comprising:
- a housing;
- an input terminal for receiving a voltage signal representative of the voltage on the spark plug wire;
- a plurality of voltage level indicators mounted to the housing to form a bar graph, each indicator corresponding to a selected voltage level;
- an absolute value circuit having an input coupled to the input terminal for receiving the voltage signal and having a magnitude output;
- and
- measurement means coupled to the magnitude output and the plurality of voltage level indicators for activating each voltage level indicator for which the magnitude output exceeds the corresponding selected voltage level.
Dependencies are inferred from the claim text.