The purpose of this test is to examine primary ignition voltage and current within a DIS unit.
This test involves measuring a potentially hazardous voltage.
Please ensure you follow manufacturers' safety instructions and working practices and ensure the rated voltage for all accessories you are using meets or exceeds the expected voltage.
This helpfile refers to a 10:1 attenuator. If you are using a 20:1 attenuator please adjust the Probe settings for the relevant channel. These settings can be found under the Channel Options button, then: Probe > 20:1 Attenuator.
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.
These known good waveform(s) have the following characteristics:
Channel A is a typical primary ignition trace illustrating dwell, firing voltage and spark duration.
Channel B illustrates the current build up in the primary coil throughout the dwell duration.
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