Weekly Waveform #9 - Ignition Primary Current and Voltage
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- Опубліковано 5 гру 2020
- WARNING!! if your using a scope that has a maximum input voltage of 200volts of less you should use an attenuator to protect your scope.
We will be testing "dumb" ignition coils for this test because the newer smart coils do not give us access to the primary voltage control wire. In the video I will show you key points of the current and voltage waveform. uScope uses the 10:1 attenuator.
Connections for each channel
Channel 1 - ground connected to engine block or battery negative
signal wire connected to ignition primary control.(this is the normally the negative side of the coil)
Channel 2 - low amp clamp around either primary wire for the coil. Power wire or control wire will work fine.
Settings for each channel
Channel 1 - -20volts to 400volts with attenuator probe selected. If you don't have a custom probe with those settings you can select the factory option for -400v to 400v
Channel 2 - 10amps or 20 amps depending on the vehicle
Most scopes 20ms/div to 100ms/div depending on if its a single cylinder capture or all cylinder capture.
Snap-on will be 5ms to 10ms sweep time.
/ automotiveweeklywaveforms
affiliate link used below help support the channel at no addition cost to you. Thank you
60 amp PDI low amp clamp with banana plugs- amzn.to/3qznAW0
Cheaper hantek low amp clamp(I have never used this clamp) - amzn.to/2JwUC8x
20:1 attenuator - amzn.to/2JSicwl
10:1 attenuator for uscope - www.aeswave.com/Primary-Ignit...
back probing set - amzn.to/3587E46
secondary ignition pickup(we will need this shortly) - amzn.to/35bxlkm - Авто та транспорт
You have a great understanding of the system and you explained it well. It was easy to follow along.
What a beautiful explanation!!!!
Awesome video ,great explanation
Amazing vídeo, Man... Cheers from Brazil
Turns ratio is same as voltage ratio
And they both are the inverse to the current ratio
Therefore power in equals power out
Thanks for the information, been ages since I scoped an ignition coil (a step up with high current on primary and high voltage on secondary) and man do I need a refresher despite working electronics for decades.
Thank you for sharing this valuable information, I appreciate very much this ability to explain these procedures so easily, I send you a greeting and I follow you with great interest, I wish you everything goes very well
Outstanding thanks so much !!
Loved the video 😊
You might get a capture from my lawn mower 🤣 only thing at the dealer with a distributor is locked up waiting on engine
The detailed scope setup is really helpful stuff... I wonder if that little bit of turbulence halfway down the burn line could be from a bit of carbon on a valve, letting some combustion gases flow past it?
oscillations, like snapping a rubber band :)
Great Video and your description !!!!
I am trying to get tach signal from my yamaha MT07 which has 2wire COP coils.
The aftermarket I am using cant read at all through these 2 cables.But it works 9 times more Hz from crank sensor.
If you could give any advice ,it would much appreciated.
If it’s a 2 wire coil you should have one power wire and one control wire. The tech is normally connected to the control wire and some tachs have “gain” adjustments to play with until the signal works for the tach.
If you have a lab scope I would check the primary side of the coil and see what type of signal is present.
@@ThePracticalMechanic I already know which is power and which control,but my tach cannot adjust itsself to read it at all,I now looking for some signal pickup amplifier maybe to send the right square waveform .
Thanks a lot and keep on your great job!!!
My wave forms are small on primary coil. There not to scale. I'm on pico 7.
I have the Launch Torque 5 scope. If ignition primary can reach 50k volts, what ratio attenuator could I buy to protect my 100v max scope?
The primary can reach 400v on the inductive kick. Most use a 10x or 20x attenuator.
The secondary wire is 50kv and you do not want to connect anything to that. The secondary side is the plug wire or coil boot side.
If you are checking secondary you will want to use a secondary clamp that goes around the wire but doesn’t pierce it.
@@ThePracticalMechanic Thank you. What about injectors? My Launch Torque has a limit of 100v.
@@meblake7359 most injectors rarely have a kickback over 100 V but some can be up to 200v
Not clear on which wires u r probing
Could not see under the coil
One side gets +v constantly (battery) and the other is control switching from ground (allowing current to build up a magnetic field) to high z, causing the collapse of said field to fall onto secondary creating high voltage and therefore spark. So not the +12 side, he's hooking up to the points side or condenser side
I see you must have taken the wrong panel off the amp clamp when you were changing the battery. 😂 BTDT🤦♂️
Too many times🤣