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The
COP III
Created by Mac VandenBrink
The
Secondary Ignition Guru
This handy tool hooks between your scope and the coil and allows you to kill a coil by harmlessly dissipating the primary current while passing the signal through to the scope for analysis. It also attenuates the signal 10:1 without distortion.
Included with the COP III are leads and a nice pouch.
The Logic of
COP-III
To make the Scope work for you on "Coil per Plug"
ignition.
Above description applies to the model COP-II and the COP-III, serving as a preliminary check and a quick way to justify a scope hookup.
Additional
CYLINDER KILL applications:
1.
Use in conjunction with
exhaust gas analyzer, to determine hydro-carbon per cylinder.
2.
Observe O2 sensor response -
upper limit and lower limit range.
3.
Observe idle compensation
response using a tachometer.
4. Verify valve malfunction with power balance at various speeds.
If
no primary connection is accessible:
Connect to the pulse signal. The kill button safely prevents any trigger
signal to activate the module.
If
engine dies when killing a cylinder:
Some vehicles feature a fuel shut-off when the ignition stops firing. This usually occurs only when button is held in the kill position.
Solution: Kill momentarily, just long enough to
indicate function.
SCOPE APPLICATIONS
In order to perform any meaningful combustion analysis in the primary, it is essential to amplify the firing time amplitude. To make this possible the objective is to provide a means to stabilize the scope pattern with an external trigger, independent of signal variations on the display pattern.
USING A LAB SCOPE:
·
BASIC PATTERN:
The
lab scope output is attenuated 10x to reduce the 400+ primary inductive kick to
a 40 volt level to protect the equipment.
If the objective is to check this induction and measure firing time, a
single channel is adequate.
·
DETAILED ANALYSIS:
If
the objective is to perform combustion analysis, the firing time needs to be
amplified considerably. This however,
may cause multiple triggering and loss of pattern stability.
·
THE SOLUTION:
If
the lab scope is equipped with an external trigger option, use the trigger
output provided by COP-III. (See above)
When
the scope does not have an external trigger option, a second channel may be
used for triggering.
One
channel is for sync and the other channel for amplified pattern analysis.
·
HOOK UP:
Connect the BNC connector to channel number 2. Feed the trigger signal into channel 1. Channel 2 can be set at any desired amplitude, since the trigger is external and not affected by snap-test, acceleration, or high residual energy.
USING AN IGNITION SCOPE:
·
EXTERNAL TRIGGER:
Most
ignition scopes demand a sync probe placed on the secondary #1 plug wire.
This
makes the ignition scope useless for COIL PER PLUG primary hookup.
The
COP-III features a trigger output to connect to the scope sync input. This satisfies the demand for a #1 Sync.
In
addition it solves the problem of an unstable pattern even on a snap test.
·
ISOLATED OUTPUT
With
the latest high current ignition types, some low impedance scopes may load the
ignition enough to distort the primary pattern or even kill the ignition.
With
the COP-III in line with the primary lead, the scope no longer loads the
circuit.
This
feature protects both the scope and the ignition of excessive current drain.
·
BASIC IGNITION ANALYSIS:
Select
the 400 or 500 volt scale and connect the scope primary to the female banana
output after removing the alligator clip from the cable that comes with the
scope.
·
ADVANCED FIRING TIME ANALYSIS:
Select
a 100-volt scale or lower to optimize firing time voltage analysis.
A
time base of 2 Ms is adequate for most applications.
COP-III -
INTERRO hook-up
Using the IGNITION module:
1.
Remove
the alligator clip from the green primary lead.
Plug the exposed banana plug directly into the
COP-III primary connector.
Feature:
Early INTERRO production is known to kill some low impedance ignition systems upon hookup. The COP-III effectively prevents loading the ignition, making the INTERRO compatible with any ignition system, without negative effect on the scope pattern.
2.
Using
a BNC adapter to the SYNC input of the scope, connect the RCA phono-plug
extension cable to the sync outlet of the COP-III.
Features
(a) Without this hookup, the scope may require a sync probe hook-up. Since "Coil on Plug" systems, have no #1 plug wire, the COP-III effectively provides a sync pulse, closely resembling the sync probe output.
(b) The generated sync trigger level is well beyond any primary oscillations and is totally independent of voltage scale selection. This improves pattern stability and even locks in on a snap-test.
Using the 4 Channel LAB-SCOPE module.
1.
Select
one channel for scope pattern display using the double ended BNC cable:
Feature:
A 10 to1
attenuator required for lab-scopes is built inside the COP-III.
A typical 400 volt primary kick input is safely reduced to 40 volts. The COP-III is pre-calibrated for the BNC
cable provided with the COP-III kit.
2
Program
a second channel for sync using the BNC adapter and the RCA phono cable:
Feature:
This is ideal for amplifying firing time for more detailed information and comparison between cylinders. This separate trigger allows the freedom to expand the scope pattern and to select any voltage level without double triggering or loss of sync.
Your cost for this handy gadget is $235 plus $15 shipping and handling (WA residents add 8% sales tax).
You may order with Visa, Mastercard, Discover, Pay Pal, or check. For secure on-line payment, snail mail, or secure email payment methods, please click on the “Add To Cart” button below. Phone orders are also accepted. Please call or contact us, if ordering from outside the USA.
360-455-9130 or 877-628-4899 toll free.
