Motor Age How2 #7 - Performing A Relative Compression Test (featuring the uScope)

As promised, we start looking at how to use the accessories I shared with you last time to perform a variety of diagnostic techniques. In this episode, I use the uScope to perform a relative compression test using the high amp current clamp. I also introduce the idea of using a trigger to capture your pattern.
Learn more about the AES uScope HERE:
www.aeswave.com/uScope-Master-...
Be sure to let me know what you think of the series in the comments section and share the series with your fellow techs!
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Due to factors beyond the control of Motor Age, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. Motor Age magazine (UBM Americas - Automotive Group) assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. Motor Age recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of Motor Age, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not Motor Age magazine or its corporate parent, UBM Americas.

[@clems6989]

You do a great job on the videos, just enough detail to be thorough. But not to the point of losing the audience. .. Excellent work !

[@MotorAgeMagazine]

Thanks Matt!

[@stuzman52]

Very nice demonstration Pete of showing relative compression. These videos of "How To' will be very successful and will help a lot of new techs and DIYers who want to learn more about scopes, etc. Keep up the good work :)

[@MotorAgeMagazine]

Thanks for the kind words...I try!

[@blackbambinoe]

When guys like you retire. I am proud to say that you all have do your best to pass on your knowledge to assist the future.

[@MotorAgeMagazine]

Thanks Daniel! I hope I'm not going off into the sunset anytime soon, though! :-)

[@johnmckamy6398]

sweet truck and great video

[@kyhomegarage3430]

Very nice presentation. Thank you for sharing.BTW nice scope.

[@MotorAgeMagazine]

Thanks for taking the time to comment! Glad you liked the video.

[@richardmcwhirter9396]

another great video thanks!nice clear test

[@MotorAgeMagazine]

Thanks for taking the time to comment. It is much appreciated!

[@motorhead6763]

nice I get a uscope. I can usually determine low dead cylinder by ear when crank and run as well as rpm drop by pulling plug or injector wire off each cylinder while running. Shalom

[@weldingjunkie]

motorhead yeah but customers want to see definitive proof not just an ear, scopes help

[@mesalazar3303]

nice job, I hope you can do one on reading electrical diagrams.

[@MotorAgeMagazine]

We did, some time ago though. Take a look and see if you think we need to tackle this topic again...kzbin.info/www/bejne/pajaZK2jbct6gLc

[@gimmick1974]

I agree with Pirsch Fire Wagon. I enjoy your videos very much and also would like to see more on the uScope. I own one and have been struggling with it a little. For example, I am unable to set my V / Div at 50mv like you have done. The lowest I can go is 0.1A (why does mine show Amp instead of V ??) Thank you for the great videos!

[@MotorAgeMagazine]

I'm thinking you may need to go check your presets. I did a video with Jorge Menchu some time ago on the scope. You can watch that here: kzbin.info/www/bejne/n4fGnYCuirx9aJI He is also working on some new improvements and when he's done, he's promised to come back on and do an updated video on the tool. Be sure to sub to the channel so you won't miss it!

[@James-fs4rn]

👍 thanks!

[@artbeach1958]

Great video! I currently have a Autel scope, I'm not sure where I can get an amp clamp for it, could you recommend which one I should purchase, and where I should purchase it from. Thank you!

[@MotorAgeMagazine]

Try my friends at www.aeswave.com. They can offer you a variety to chose from.

[@leomcalla29]

hey Pete , good presentation. I've been itching to get me one of those uscope but I have a vantage pro and a hantek but I need a run and gun scope. what you think ?

[@MotorAgeMagazine]

The uScope is a very capable single channel scope. It boots fast and would allow you to grab a quick capture whenever you want. I also encourage techs to fire up whatever scope they own every morning as part of their before work routine so it's ready to go when you need it.

[@leomcalla29]

Motor Age you right on that one I've got to get in that habit. lol thanks again.

[@REPOOCNITSUJ]

when you're adjusting the values, what exactly do you mean when you say "per division"? Is 50 m/sec or 200 m/sec the entire screen? Or is the division each grid on the screen? Thanks for the video.

[@MotorAgeMagazine]

This will help: kzbin.info/www/bejne/iHSnkpSHna11oM0

[@REPOOCNITSUJ]

Thanks for the help. This is really a great series, as a beginning scope user these courses are helping a lot!

[@randy1ization]

what is the part number for the pico amp clamp that works with the u scope? thanks

[@MotorAgeMagazine]

There is an adaptor that allows you to connect the BNC lead to the UScope. There is also one available for amp clamps that use banana jacks. Visit the AES site for info.

[@juan201270]

Hello sir where did u get the adapter for u scope the ac clamp looks pico clam i need to buy that adapter

[@MotorAgeMagazine]

You can buy accessories for the uScope directly from www.aeswave.com

[@perez7667]

Hey, Pete. Why not clamp only the positive cable going to the starter?

[@MotorAgeMagazine]

You can - choose whatever cable is the easiest.

[@georgebonney90]

👍

[@zubairsherwani]

My uscope paddle prob got spark from distributoe cap, now it do not measure any voltage. Doesn't it have any safety? Is it repairable? Risky equipment.

[@MotorAgeMagazine]

Contact aeswave.com and let them know what happened. They may be able to help.

[@zubairsherwani]

@@MotorAgeMagazine i sent an email to them 2 days before, and waiting for their response.

[@josephtucci3666]

well done Pete! I am retired now and I sold my pico scope and was looking at the Uscope small kit Do you think it is worth the $ asked for it???

[@IsshmanGarcia]

Joseph Tucci it's $154 now, I got mine a few years ago @$120..it's well worth it my friend. It's amazing to me! along with this channel, search scanner danner uScope. you can piece together the master kit yourself like I did. search for Astro Camper video about putting together a master kit. Astro doesn't really like uscope, but it's well worth it's price. It can do just as much as the big brand scopes (snap on) can do with minimal exceptions and it's just a 1 channel, but so what .

[@pczapp827]

Why would you sell a Pico or anything else--just because your retired ?

[@chriscanty8214]

Joseph Tucci its a good scope

[@MotorAgeMagazine]

Personal opinion? It's great for quick checks but for full out diagnostics I'm from the "more channels I got, the better" school of thought. As with anything else, what do you want the tool to do for you?

[@chriscanty8214]

I also have a vantage ultra it's pretty nice

[@NN-gy7xl]

that uscope looks cool but i keep reading it has issues with charging. wish these products were cheaper but nonetheless great video!

[@IsshmanGarcia]

N N I've had my uScope for over a year and a half and have NEVER had issues with charging! The problem is people don't read manuals. the uScope has a sufficient manual. Believe me, it's worth it. Excellent pictures, screen shots you can bring to your computer to print for your files. you can make presets, it comes with a lot of presets already or you can just select labscope-so you can set things up yourself. I was new to using scopes when I purchased the uScope, but now I'm like a pro with that thing. I've scoped EVERY sensor, injectors, coils, plug wires..on my car as practice- now I make $ using it on other peoples vehicles. Invest in yourself my friend-Invest! PS... and as far as it being a 1 channel scope- you could do what I do: get one of the waveforms you want to compare on the scope (cam), then save it as a reference waveform. Then call that waveform back up and then scope the other waveform live you want to compare the first one to (crank). So now you have 1 live waveform on the screen and 1 reference waveform on the screen at the same time-- Just make sure the settings (scales) are similar and all will correspond correctly. COMPARE ON PEOPLE! as of 2/17/2017--I was told by an AESwave employee that they are in the "process of finalizing the update that follows 6.01, but it wont be released to the public for awhile". I pressed for feature details but they didn't bite.

[@jeffhesse8415]

Isshman Garcia , Thanks for your input on the U-scope. I've been thinking about getting one just have not heard much about it. I will definitely check it out.

[@MotorAgeMagazine]

I don't use mine much and was pleasantly surprised that it still had a charge on it when I pulled it out for this video. The guys at AESWave tell me there is an update coming soon but not sure of what the update covers. We'll be doing an "In The Workshop" segment when it's ready and go over it all for you right here!

[@chriscanty8214]

to disable the fuel system will I need to unplug the injectors

[@MotorAgeMagazine]

If that is the easiest thing to do. Or pull the fuse and/or relay for the fuel pump. The idea is to not wash down the cylinders with raw fuel -

[@chriscanty8214]

Ok thanks for the help I'm just starting out learning a lot from your videos

[@MotorAgeMagazine]

I'm glad it's helping you. There is a lot more to come!

[@chriscanty8214]

Can't wait look forward to every video

[@MotorAgeMagazine]

Just thought...if you try your low amp clamp, make sure that you use the cable that is connected to the starter (positive side) or the heavy cable on the ground side. And make sure the jaw can close all the way. But don't sweat if that doesn't work. I'll show you in the next video another way to do the same test!

[@chriscanty8214]

I have a low amp clamp with my uscope will it work

[@MotorAgeMagazine]

Chris, the low amp clamp won't work if you use the DC function on the scope but may if you select the AC mode only. This eliminates the DC element. There are some other ways to use the AC coupling feature to perform this test, too. Stay tuned!

[@chriscanty8214]

Ok thanks

[@MotorAgeMagazine]

Check out the video I did on AC coupling earlier in this series if you haven't already. Then try it out!

[@chriscanty8214]

Ok thanks