Instructions for setting your scope to display a firing event (trigger pulse) are included with the test lead. can use it as a reference point to correctly superimpose or parade a succession of individual events such as ignition signals even at slow time base settings. can make adjustments to time base and still maintain the organization of the waveforms on the screen regardless time setting will know when other signals are displayed according to the firing of #1 cylinder: For example, identify cylinders for cranking compression test or running cylinder contribution tests. can see the exact relationship between the trigger pulse and the other waveforms on display. Seeing is believing! With a trigger pulse displayed on the scope you: With the trigger pulse on display you know exactly when it happens in relation to the other waveforms on display. For example, when you slow the time base, if the trigger pulse is not visible it is difficult to judge when the next firing event occurs.
#THE 2014 SNAP ON MODIS ULTRA ACCESSORIES PRO#
The MODIS, VERUS, and Vantage Pro have a dedicated ignition trigger input that does not display the trigger signal, this can put you at a disadvantage. Snap-on scopes have an internal trigger, why do I need an external trigger? The AES Trigger Pickup (Inductive) Lead is an 'external trigger' and connects to any scope channel, usually channel 1.
Use the AES Trigger Pickup signal to mark fire in the hole - #1. The Trigger Pickup signal will represent #1 compression in the cranking compression waveform.Įxhaust Pressure Testing: Same as above.
#THE 2014 SNAP ON MODIS ULTRA ACCESSORIES UPDATE#
To step through the crank signal, move the Trigger Pickup to the next plug wire…and the waveform will update a new section of the signal!Ĭranking Compression: Place the AES Trigger Pickup on #1 spark plug and perform a cranking compression test.
Put the AES Trigger Pickup on #1 plug and trigger from it. This results in a signal that walks left and right across the screen. Stepping through the Crank Signal: Many crank signals are very repetitive without any specific characteristic to trigger from. The pulse produced by the trigger pickup makes this possible. To reduce your exposure, work in a well-ventilated area and with approved safety equipment, such as dust masks that are specially designed to filter out microscopic particles.ĭisplaying a trigger signal on the screen is a very powerful aid for signal analysis, whether you need to judge the relationship of a signal to a position of the crank shaft or to an ignition event, or simply, just to hold/stabliize a repetitive signal.
Your risk from exposure to these chemicals varies, depending on how often you do this type of work.
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