7.4.3. Removal of oscillograms of a high voltage with oscillograph use
Way of measurement
Establish on a high-voltage wire the special sensor.
For cylinders 2 and 4 polarity of tension of breakdown it will be opposite on polarity of tension for cylinders 1 and 3.
As the ignition system with the simultaneous spark category in two cylinders is used, it is possible to observe at the same time tension oscillograms for two cylinders (for 1 and 4 цил.и for 2 and 3 цил.). However removal of the oscillogram of a high voltage is possible only for that cylinder on which wire the special sensor is established.
Happens inconveniently to define, the observable oscillogram belongs to what cylinder. It is necessary to remember that the oscillogram of that cylinder to which wire the high-voltage sensor is connected, will have steadier image on the screen.
Establish on a high-voltage wire the synchronization sensor.
The sensor of synchronization establish on the same high-voltage wire on which the special high-voltage sensor is established.
Oscillogram of tension of serviceable system of ignition
Conditions at which measurement (is changed only the pattern selector parameter – the type of the image) is made
Pattern selector (type of the image)
Display (long display)
Conditions at which measurement is made
Characteristic sites of the oscillogram
Site And: the amplitude (height), a litelnost and the back front of the spark category allow to establish the following deviations (Look examples of oscillograms with characteristic malfunctions – examples 1, 2, 3 and 4).
Site In: number of fluctuations on an attenuation site (Look an example of oscillograms No. 5).
Site With: number of fluctuations at the beginning of a site of growth of penetrative tension (Look an example of oscillograms No. 5).
Point of D: penetrative tension (and also tension distribution on cylinders) allows to determine the following consistent patterns.
Point of D