How to use an Oscilloscope and why - Steve Saunders Goldwing Forums

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post #1 of 28 (permalink) Old 05-03-2019, 04:54 PM Thread Starter
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How to use an Oscilloscope and why

This is a technical document from Rohde and Schwarz
59 pages of reading....


they start out soft, and then they dig deeper.


I have seen a few folks asking how to use a 'scope, and others asking "why is it necessary" or how is it advantageous.


this document covers all of that....
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File Type: pdf Educational_Oscilloscope.pdf (3.02 MB, 46 views)
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post #2 of 28 (permalink) Old 05-03-2019, 10:15 PM
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I just checked these things on Amazon and while $5K may be an important add on to you guys that have just bought a brand new Goldwing, and, in actual fact it's only about 25% of what I got in my GL1100 right now, the vast majority of us will just ignore it. 'Cos, we really don't need it.

For what it's worth and if I may be so bold? The current rebuild of the `80, `81, `82 & `83 GL1100STDASPENSTATE can be followed on classicgoldwings.com in a thread called "The plan is to turn 140,000 into 50,000."

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post #3 of 28 (permalink) Old 05-03-2019, 10:23 PM
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Quote:
Originally Posted by chilidawg View Post
I just checked these things on Amazon and while $5K may be an important add on to you guys that have just bought a brand new Goldwing, and, in actual fact it's only about 25% of what I got in my GL1100 right now, the vast majority of us will just ignore it. 'Cos, we really don't need it.
I have had use for one but have gotten along without one for a long time.

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post #4 of 28 (permalink) Old 05-03-2019, 10:56 PM
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I've got a Tecktronix TM503 that is a great little 20lb unit with a carrying handle that I have ABSOLUTELY NO IDEA how to work!!! I had intended to use it to help diagnose tachometer problems on my 1500 but, the tach began working flawlessly all by itself.



I have no use for it but if anyone has a "need" for one, , , its yours.
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post #5 of 28 (permalink) Old 05-04-2019, 01:55 AM
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There are plenty of small digital scopes for cheap. Not to mention software that will let you use the audio in on a computer for some basic scope measurements. Also plenty of used CRT scopes at give away prices.
For a modern digital storage scope at a good price, have a look at the Rigol DS1054Z. A nice 4 channel scope you can find new for $300 on sale. A nice set of features and with some software mods you can find online, you can add a bunch of extra features. I've had one for a number of years and it still performs flawlessly. It seems like every electronics Youtuber and his brother have one of these on their bench, too.
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post #6 of 28 (permalink) Old 05-04-2019, 02:56 AM
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Still have my old reliable CRT Hitachi Dual Trace machine... Still serves me well for all I do now...

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post #7 of 28 (permalink) Old 05-04-2019, 06:30 AM
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I've got a Tektronix 465B 100MHz Dual-trace scope I've had since the '80s - Considered an "industry Standard" back then.

I haven't had the heart to get rid of it, but it doesn't take up that much space in the attic, and when you need it, you NEED it. Had to use it a couple times to troubleshoot fuel injection on GF's 1999 Grand Prix. Car was running bad, OBD codes said MAF sensor. Got a new one, car still running bad. Get the 'scope out of the attic - Sure enough, new sensor out of the box was bad, too!

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1972 CL-350 (1980-1988) sold
1978 Suzuki GS-550 (1985-2005) sold
1977 GL1000 (2002-2006) sold
1980 GL1100 STD Vetter (2005-)
1993 GL1500 Aspencade (2017-)
1983 Trav-Lite Camper (2010-)

Last edited by DenverWinger; 05-04-2019 at 09:07 AM.
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post #8 of 28 (permalink) Old 05-04-2019, 07:32 AM
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Notes on oscilloscope display measuring MAF sensor:

There's a three terminal connector to the MAF (Mass Air Flow) sensor on the '99 Pontiac, +5v, Signal and Ground. Connect scope to "Signal" and "Ground".
The MAF measures the amount of air flowing thru the intake plenum after the throttle body.
With the engine idling (air flow is minimum) the signal output from the MAF is supposed to be a nice 5v Square Wave at a relatively low frequency.
As you slowly rev up the engine the square waves smoothly increase in frequency (get closer and closer together on the 'scope display) directly corresponding to the amount of air flowing thru the plenum.
The ECU uses this information along with many other sensors to determine how much fuel to inject.
If you punch the throttle, the scope display will show the square waves tighten right up in a high frequency burst corresponding to the big inrush of air when you blip the throttle.

The bad MAF I was testing showed a very unstable square wave (random square wave pulses at random frequencies) which bore no relationship to the air flow thru the plenum.

This confused the **** out of the ECU and the car ran so bad it wouldn't idle, and spit/sputtered going down the road. We disconnected the MAF and the car ran much better - that put the ECU in a fail-safe mode and it relied on the inputs from the remaining sensors. So we were able to drive back to auto parts and exchange the bad sensor. I changed out the sensor right there in the parking lot so I'd know it was good before leaving....

1972 CL-350 (1980-1988) sold
1978 Suzuki GS-550 (1985-2005) sold
1977 GL1000 (2002-2006) sold
1980 GL1100 STD Vetter (2005-)
1993 GL1500 Aspencade (2017-)
1983 Trav-Lite Camper (2010-)
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post #9 of 28 (permalink) Old 05-04-2019, 08:04 AM
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Quote:
Originally Posted by BLUTHUNDR31 View Post
I've got a Tecktronix TM503 that is a great little 20lb unit with a carrying handle that I have ABSOLUTELY NO IDEA how to work!!! I had intended to use it to help diagnose tachometer problems on my 1500 but, the tach began working flawlessly all by itself.



I have no use for it but if anyone has a "need" for one, , , its yours.
I have been looking for a scope for years for odd projects, both automotive and electronic. If you want to get rid of it I would love to have it.
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post #10 of 28 (permalink) Old 05-04-2019, 08:08 AM
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Check this out:




Only 200KHz bandwidth, but it's only 32 bucks. You can do a lot with 200KHz....

1972 CL-350 (1980-1988) sold
1978 Suzuki GS-550 (1985-2005) sold
1977 GL1000 (2002-2006) sold
1980 GL1100 STD Vetter (2005-)
1993 GL1500 Aspencade (2017-)
1983 Trav-Lite Camper (2010-)

Last edited by DenverWinger; 05-04-2019 at 11:16 AM. Reason: Fixed typo
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