Oscilloscope ROLL mode used for?

[willwatts]

What is the ROLL mode on the Oscilloscope used for?
When would a technician want to use the ROLL mode to test of what type of waveforms or signals?
what kind of circuits would a tech use the ROLL mode on the oscilloscope

 

[profbuxton]

Are you a technician?
If yes then you should know!
If not then read the appropriate manual.

 

[KrisBlueNZ]

Have you tried http://www.google.com/?gfe_rd=cr#q=oscilloscope+roll+mode

 

[willwatts]

Yes i know it rolls past, but you can't use the cursors or take a measurement, so why use the roll mode? when would you use this for what type of measurement or test? or what are you looking for in roll mode?

 

[profbuxton]

Guess what? I wasn't aware of what it was either!
So I looked it up and ha ha now I know more than you! Bet you can't do that for yourself!

 

[(*steve*)]

So I looked it up and ha ha now I know more than you!

Prof, Willy is in a country that lacks money to pay for roads and has no access to the internet. As such he can't use Google and only has this web site to ask questions.

Also, he can't read.

 

[willwatts]

can you please give some examples of when you used this ROLL mode and for what reason? what were u looking for when the waveform was rolling and what kind of measurement was it?

 

[JimW]

Sure, I'll bite on this. I use roll mode all the time. Any slow occurring event that I am trying to see the cause/effects of. Usually user interactions (since humans are notoriously slow). Of course this is most useful with a digital multichannel scope. When I see the event roll past that I am looking for, or an interesting sequence of events, I stop the scope acquisition and take my time examining the screen data (using the cursors and data measurement modes that you mistakenly stated that could not be used).

JimW

 

[willwatts]

But you're using the a storage oscilloscope in Roll mode? if you're able to stop the acquisition you're using a storage oscilloscope.

When I was to see a slow occurring event, I use the single sweep mode

You can scroll before the trigger event and after the trigger event using the single sweep mode

Using the Roll mode doesn't make sense to me when to use it and what it is used for

 

[(*steve*)]

You're an absolute dill Danny.

If your single shot mode initiates a sweep that takes 10 seconds, what do you do if the even happens after 11 seconds.

Compare and contrast single shot mode with roll mode in this instance.

Why is it that not only do you want people to google for you, and read for you, now you also want people to think for you?

 

[hevans1944]

... now you also want people to think for you?

I don't think autistic idiot savants actually do any thinking. More likely they respond to whatever random meme presents itself for inspection. I think the psychobabble folks call this random or free association. Not sure what, if any, therapeutic value it has, but it seems harmless in Danny's case. Maybe not so much for those of us who respond.

 

[hevans1944]

can you please give some examples of when you used this ROLL mode and for what reason? what were u looking for when the waveform was rolling and what kind of measurement was it?

Back in the "good old days" we recorded slow-changing or infrequent events on strip-chart recorders because there was no such thing as a digital storage oscilloscope. These recorders varied in the number of channels recorded and the method of recording. Some used ink pens driven by servo-motors, others used miniature galvonometers with mirrors attached to deflect a light beam onto photosensitive paper or film. The galvonometer types were only a few millimeters in diameter and perhaps 50 mm long. Several dozen could be inserted on a common permanent magnet pole-piece to record multiple channels. They were quite fast for their day, about ten kilohertz bandwidth IIRC. One version of this was used on the B-52 bomber fleet to record in-flight stress and temperature data. This information allowed for many improvements in the B-52 platform, which helps to explain why those airplanes (heavily modified) are still flying today. Well, that, plus it was a damn good design from Day One.

Still another variant was the so-called kerosene electrostatic printer. This puppy had a row of charging pins across the width of the paper, which was then pulled in a direction perpendicular to the row of pins. Each pin could be selected to deposit (or not) an electrical charge on the specially-coated paper as it rolled by. The charges attracted (or not) toner particles dispersed in a re-circulating kerosene suspension. After the toner was deposited on the paper, the kerosene was vacuumed off and recirculated. I once saw at a trade show an E-size version of this machine printing in full color from RGBK toner reservoirs. It had to rewind the drawing for each color pass, but it was very fast. Took maybe fifteen or twenty seconds to complete a full-color E-size drawing. We used a black-and-white printer version in our shop for computer printouts. The stream of paper coming from the printer was continuous and occurred faster than a human being could read it. Only disadvantage I could see was the cost of the specially-coated paper. I think this was a Xerox product, but I don't remember what brand they put on it. It probably doesn't exist today, but it could sure roll paper back in the day.

 

[willwatts]

we use at work a GOULD recorder its a plotter , prints out paper rolls. Mostly it's used for when you have glitches or intermittent signals or events , infrequent events .

But I have never used the ROLL mode for this

I have used a Digital Storage Scope , Lecroy has a deep memory storage scope

The Lecroy has a lot of triggering options for glitching and events , the old lecroys

 

[willwatts]

can you close this thread, so i can start a new subject

 

[KrisBlueNZ]

OK I'm closing it now Danny