Using An Oscilloscope to test a Tach and CDI
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- Опубликовано: 22 авг 2024
- Using an Oscilloscope should be your go-to tool for solving electrical problems. It helps you to see the waveforms. We used this setup to test after the tach was updated. Before the update, the tach was causing the CDI to not fire. This was solved because we could see the problem on the oscilloscope. Without this tool, it would have been impossible to resolve why this issue was happening
Check out our article on Oscilloscopes here
klassikats.com...
The Oscilloscopes I use in my shop are the
Siglent SDS1052DL, amzn.to/35veuzN
the SDS1102X, amzn.to/3kpYy8f
and a hand scope, DSO1062B amzn.to/37EehwL
Probe Set amzn.to/3dREuZL
Thanks for watching.
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/ klassikats
Great job! Solve all my questions about how a tachometer works.
Glad it helped!
Kurt
Wow - Intro sound effects ------- PERRRRFect!
Sounds good no matter which way it spins!
Greetings sir!
I'm trying to find an RPM signal source on my motorcycle, which I can feed to my Arduino board. I'm trying to make a sequential shift light like those on racecars. Where can I get such an input signal? Can I use the negative terminal of the ignition coil? I couldn't find a wiring diagram that specifies the wire to the onboard rev counter. So I was looking for a more generic way to get RPM signal. I'm not willing to use the inductive spark wire loop thing coz it has too much noise that needs to be filtered
Using the negative side of the coil will not work, you would have to use the positive side. However depending on what type of ignition system the bike is using you may have a waste spark type of coil in which case your RPM numbers will be double actual RPM. If it were me I would locate the tach signal wire on the bike and plug into that circuit as it is going to be the most accurate signal.
Kurt
Hi. Thanks a lot for your video. Can you please tell me what is the correct setup for the wave generator to perform this test on the CDI? And what are the input value for increasing the revs in the rev counter? I sould't like to blow up my stuff :) Thanks again.
To trigger a 6 pin CDI box you need to set your frequency generator to a 20 volt Sine wave and frequency of 00,000.050 for an idle speed to 00,000.350 for 7000 rpm. To check the tach you will use the same frequency settings but instead of a sine wave you will need to use a 12 volt square wave signal. When using a wave form generator it is pretty hard to blow anything up, so you should be safe even if you gave the inputs the wrong volts or frequency.
Thanks for watching
Kurt
@@klassikats Can I use an audio system to generate this wave form? Say a tone generator application square wave on a phone then amplify it to 12 volts? 16.6HZ for 1000 rpms? Thanks!
Installed an Accuspark electronic ignition and now my tacho shows to high revs. What has happened? Are there any fix?
use your oscilloscope and look at the trigger signal. probably outputting a signal that is really messy and your tach thinks the engine is turning faster than it really is.
Kurt
@@klassikats Thanks. You are probably right. Will try to borrow a scope from somewhere. Think maybe I try adding a diod or resistor (in series to a capacitor perhaps) to the signal line.
What scope model is that. Looks like a Rigol, maybe 1102, but the screen looks too big for that.
The scope on the table is a Siglent SDS1052DL, amzn.to/2ZftPkP
They are not too pricey and they cover what we need
Thanks, Klassik ATS
COULD YOU PLEASE SHOW THE CONNECTIONS FOR THIS TEST IN A INTERACTIVE WAY SO I CAN DUPLICATE WHAT YOURE DOING THANK YOU, IM A MOTORCYCLE TECH AND WANT TO LEARN MORE ABOUT TESTING EQUIPMENT.
Paul
We will be doing a lot more videos with using an oscilloscope for testing. Keep watching and they should be out fairly soon.
Thanks