The purpose of this test is to examine the primary current characteristics on an external coil type ignition system.
The orientation of the current clamp relative to the wire will determine whether it has a positive or negative output. If a live waveform does not appear on your screen, or appears to be inverted, try reversing the orientation of the clamp.
This known good waveform has the following characteristics:
You will see 0 A until the primary circuit is switched on. Current then flows and the value rises to around 7 A. The primary circuit is switched off after 1.6 ms at which point the current ceases to flow and the waveform once again reads 0 A.
This help topic is subject to changes without notification. The information within is carefully checked and considered to be correct. This information is an example of our investigations and findings and is not a definitive procedure. Pico Technology accepts no responsibility for inaccuracies. Each vehicle may be different and require unique test settings.
We know that our PicoScope users are clever and creative and we’d love to receive your ideas for improvement on this test. Click the Add comment button to leave your feedback.