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Nitty Gritty
Triggering: Seeing is believing!
Last month we presented Jorge's article
titled Building
Better Relationships. This month
Jorge gets to the nitty gritty...Triggering from the #1 Plug.
An important diagnostic technique is the ability to visually identify
the relationships of events. For waveform analysis
this is often accomplished by triggering from the #1 plug.
To do this you need to use an ignition trigger pickup that when
connected to a plug wire will convert the ignition signal into a clean
pulse for display onto your scope.
Some scopes come with a dedicated ignition trigger inputs such as the
Modis and Fluke 98. The advantage of a dedicated trigger input is the
trigger signal does not use up a viewable channel. In some situations
this can be an advantage such as when using a preprogrammed test or when
needing to view a maximum number of signals.
On the other hand, using a dedicated trigger input that does not
display the trigger signal can put you at a disadvantage in many
situations. An example is when you slow the time base. If the trigger signal is
not visible it is difficult to judge when the next triggered event
occurs without counting. With the trigger on display the trigger pulse
will simply show itself every time and use it as a visual marker for related signal analysis.
Seeing is believing. A visual reference results into more
confidence:
-- You will know if the trigger is working correctly
-- You will know that the other signals on display are displayed
according
to the firing of your trigger: For example, ID cylinders for cranking
compression test or running cylinder contribution
tests
-- 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
-- see the exact relationship between the trigger pulse and the other
waveforms on display
-- Make adjustments to time base and still maintain the organization of
the waveforms on the screen regardless time
setting
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AES# 01-14-bp
Use with these scopes:
ET-2020
Ferret 91
Kal 3840 (Coming Soon!)
KAL 575/565a/565
Mac Quick Scope
OTC Perception and its clones
Snap-On Vantage PGM
Tek 565/575
UEI: A scope with a Code Reader. (Coming Soon!)
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AES# 01-14-LS
Use with these scopes:
ADL
7100
LS-2000
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AES# 01-14-MODIS Use
with these scopes:
Snap-on
MODIS
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AES# 01-14-bncA
Use with these scopes:
HItachi
MorrowWave
Tektronix
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AES# 01-14-bnc
Use with these scopes:
Interro PDA
Matco Insight
OTC Genisys
OTC Solarity
OTC Vision and Vision II
Pico Scope
Tek THS 710/720
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AES# 01-14-Fluke
Use with these scopes:
Fluke 98 and 98 series 2
Fluke 190-series
Fluke 120-series
Fluke 97/97a
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