Inductive Peaks - Tecnotest SL31205 Manual Operativo

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______________________________________________________________________ OSCILLOSCOPE KIT
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Push F3 (if active) to obtain technical information on the device in question.
From the comparison it is possible to realize if the defect is caused by a connection
problem (defective connectors harnesses with open or short-circuited connections) or
by a malfunction of the considered instrument.
11.0 -

INDUCTIVE PEAKS

A typical inductive example can be seen in the signal of a primary ignition circuit and in
the signal of an injector.
Both the injector and the primary circuit of an ignition coil are made of a coil with one
terminal at 12 V and the other being connected to an electronic power module
(transistor) with one mechanical switch (points)
The other terminal of the switch or transistor is connected to the ground.
The main electric feature of coils is that they offer a strong inertia to the currents
flowing across them.
When the switch closes, the current in the coil starts to flow (coil charge).
When the switch opens, the current, because of the inertia, tends to keep flowing in the
coil, but since the circuit is interrupted, a peak of positive voltage is generated on the
interruption end.
OPERATING INSTRUCTIONS 59