Thanks Justin, this is exactly what I needed to see right now. Can you do one about checking primary ignition circuits with a current probe on a lab scope as well?
Have you ever seen an intermittent injector signal where it cuts out here and there? One of mine has intermittent signal here and there with no codes and no misfires. Car running rich at idle only though. Good vid BTW
Justin can you let us know about when and where we need to use attenuators so we don't damage a scope. Also let me know where I can purchase a inexpensive scope.
Richard in my experience your scope has a hard limit on the input voltage to let you know when to use an attenuator.Let us say 5 vdc. If you want to measure a circuit you know has 24 volts dc, you need an attenuator that will multiply the input value. If you had a crank sensor that had a signal higher than 5 vdc you would need an attenuator. If you had a sensor that gave say 3 vdc signal then you can use your scope without the fear of damage. Let us assume your attenuator said x10 on a scope with a 5vdc input max. Install or place that in series with your test lead and you know expanded the working input range to 50 vdc. The attenuator acts like a device stepping down a higher voltage to a safe voltage for the meter input handling circuits. These circuits contain ic chips and dont like to operate more than safely designed. If you are looking to play/learn with a cheap scope then I would say Ebay is fine. If you work on automotive applications then AES Wave has a great selection and offers training materials. Please know the limits of your tool before you begin testing. You may injure yourself or at the very least become upset when you let the smoke out of your testing device.
