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'[EE]: Oscilloscopes'
2003\01\10@071530 by Chris Rocco

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I didn't ask, but am happy to have found your post! :)

Thanks for the links!

Chris


-----Original Message-----
From: pic microcontroller discussion list
[spam_OUTPICLISTTakeThisOuTspamMITVMA.MIT.EDU] On Behalf Of mulliganshawn
Sent: Monday, January 06, 2003 4:02 PM
To: .....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU
Subject: Fw: [EE]: Oscilloscopes

> Before Christmas, someone had asked me for tutorials on oscilloscope
usage.
> Now that I'm back at my desk, here they are:
>
> http://www.bkprecision.com/download/scope/FGGuide.pdf
>
> http://www.tek.com/Measurement/App_Notes/XYZs/03W_8605_2.pdf
>
> Both are excellent. Shawn
>

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2003\01\13@154801 by rad0

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haven't plunked down yet for an oscilloscope....


what do you need a four channel versus a two channel oscilloscope for?

what kinds of things do you do with a four channel?



thanks very much.

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2003\01\13@163305 by Rick C.

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You may want to watch various status lines on a PIC at the same time. This
will save you having to probe around with just one or two probes. Also you
loose one input if you need to need a sync signal.
Rick

rad0 wrote:

> haven't plunked down yet for an oscilloscope....
>
> what do you need a four channel versus a two channel oscilloscope for?
>
> what kinds of things do you do with a four channel?
>
> thanks very much.
>

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2003\01\14@152456 by Peter L. Peres

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On Mon, 13 Jan 2003, rad0 wrote:

*>haven't plunked down yet for an oscilloscope....
*>
*>
*>what do you need a four channel versus a two channel oscilloscope for?
*>
*>what kinds of things do you do with a four channel?

If you do video, imaging sonar, complex servos (have multilevel plls) then
it can be useful. You can also use two+one channels (two normal channels
and the third shows the external trigger waveform). Unless you do
something like this every day you will seldomly need the 3rd and 4th
channels imho.

Peter

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2003\01\14@153012 by Doug Hewett

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(1)  You may find 4 channels useful when looking at SPI or Microwire:  (a) data in, (b) data out, (c) clock, (d) slave select.

Doug

{Original Message removed}

2003\01\14@163047 by Peter L. Peres

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On Tue, 14 Jan 2003, Doug Hewett wrote:

*>(1)  You may find 4 channels useful when looking at SPI or Microwire:
*>(a) data in, (b) data out, (c) clock, (d) slave select.

With hawk eyes ;-) I can't see 1MHz signals. Can you ?

Peter

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2003\01\14@175024 by Robert.Rolf

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"Peter L. Peres" wrote:
>
> On Tue, 14 Jan 2003, Doug Hewett wrote:
>
> *>(1)  You may find 4 channels useful when looking at SPI or Microwire:
> *>(a) data in, (b) data out, (c) clock, (d) slave select.
>
> With hawk eyes ;-) I can't see 1MHz signals. Can you ?
>
> Peter

Sure, with a high enough repetition rate it's -easy- to see nanosecond
wide pulses on a GOOD scope. When debugging code/hardware interactions,
you put in the shortest loop you can to see where stuff is 'broken'.

And I would strongly second the recommendation for a 4 channel scope if
debugging
SPI/I2C hardware. It's also useful for 'normal' debugging, where you trigger
the scope with your chip select or address decoder and then confirm that the
/OE, R/W & data lines are doing what they're supposed to.
I often find myself using both channels on TWO stacked TEK 465 scopes to
get my 4 channels (6 if you count the way I use external trigger as a
"channel").

Robert

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2003\01\14@180804 by Barry Gershenfeld

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>You may want to watch various status lines on a PIC at the same time. This
>will save you having to probe around with just one or two probes. Also you
>loose one input if you need to need a sync signal.
>Rick

'Scopes have an "external sync" input, no?   No need to give up a channel.

Barry

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2003\01\14@182420 by Rick C.

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Not necessarily just a sync, but like a previos post said, you might sync on
the chip select, and you may also need to see that the chip select is there and
stable from the CS driver which you cannot do with just an external trigger.
Rick

Barry Gershenfeld wrote:

{Quote hidden}

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2003\01\14@225106 by Robert E. Griffith

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I never use the external sync on my Tek 475.  Now I'm thinking I am missing
out.  Is it basically just another channel that you can't display but only
sync off of?  If you are only viewing one channel and you want to sync off
another signal, is there any advantage to using the external sync input, or
would it always be better to put the second signal on the second channel so
that you can view it also?

So my impression is that you use the external sync when all your real
channels are being used and you want to input one more signal that you just
need to sync off.  Is that right?

--BobG

{Original Message removed}

2003\01\14@225940 by Rick C.

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Yep. Also, you may not have the necessary gain, AC/DC detection, offset, and of
course the viewing of it.
Rick

"Robert E. Griffith" wrote:

{Quote hidden}

> {Original Message removed}

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