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  1. tom2378

    voltage ramp rate at output of ignition switch

    If I put an oscillascope on the output of the ignition switch I see that when the switch closes the voltage at the output of the ignition switch rises from 0 to 12V in 10mS. The ramp is steeper at the start getting to 5V in around 1mS. The battery voltage itself falls by 200mV as the ignition...
  2. tom2378

    voltage ramp rate at output of ignition switch

    Hi All, the voltage at the input of the ignition switch, terminal 30 is 12V , I turn the key and the voltage at the ignition swith output climbs to 12V in 10mS. Half a second later both voltages drop as the engine is starting. Question : why does it take 10mS for the voltage at the ignition...

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