KVR Audio

Architeuthis · Post by **Architeuthis** » Sat Jun 24, 2006 7:44 am

one that is nice and smooth and good to look at? and free? free? just a simple oscilloscope maybe a few sine-waves wide.

Juanjo · Post by **Juanjo** » Sat Jun 24, 2006 8:03 am

There's this, might be up your alley:

http://www.kvraudio.com/get/971.html

Architeuthis · Post by **Architeuthis** » Sat Jun 24, 2006 8:06 am

I did try that already and it just wasn't smooth. It was annoying to look at a stuttery image.

justified · Post by **justified** » Sat Jun 24, 2006 8:10 am

Architeuthis it's pretty smooth if you choose trigger by "rising"/"falling" at least it works with periodic waves.

Architeuthis · Post by **Architeuthis** » Sat Jun 24, 2006 8:12 am

"rising" mode is pretty darn good. i think ill keep it. thanks.

what's the difference between rising and falling?

Juanjo · Post by **Juanjo** » Sat Jun 24, 2006 8:17 am

errr, you have time, sync and freeze controls just like a HW one, take a look at the manual... perhaps what you want is not exactly an oscilloscope...

(edit: forget it, looks like you are looking into it now

)

justified · Post by **justified** » Sat Jun 24, 2006 8:25 am

Architeuthis wrote:"rising" mode is pretty darn good. i think ill keep it. thanks.

what's the difference between rising and falling?

As far as i know there's a slider on the left, so exoscope retriggers every time when your wave goes above the level you choose in rising mode and it retriggers when your wave goes below that level in falling mode. Sorry if it's not clear enough. Well there's always the user manual.

MrM · Post by **MrM** » Sat Jun 24, 2006 9:03 am

Triggering on rising: the scope begins to draw the curve, when a zero crossing is 'noticed' and (!) the next signal is of a positive voltage (in real live think mV or uV)

Falling; the same conditions; screendrawing begins after a zero crossing and a negative value

Imagine you trigger a sine from a signal generator / function generator. Normally one measures in phase, so one uses 'rising mode'. If/when one wants to invert the phase on screen, all one has to do is switch to 'falling mode'.

Architeuthis · Post by **Architeuthis** » Sat Jun 24, 2006 9:26 am

so all it is is a phase invert?

MrM · Post by **MrM** » Sat Jun 24, 2006 9:35 am

Not exactly...
Pure waveforms, like sinus, triangle and square, all have a repeating cycle, and it goes like; zero #1, positive part (rising) zero #2, negative part (falling) and the zero again (which is the same as zero #1)

But some wave forms have stranger waveforms, like puls or complex waveforms. Sometimes you want to look at the beginning of the waveform, then 'rising' is needed.
Sometimes you want to look somewhere in the middle (zero #2 and beyond), then 'falling' is helpful.
Note that you can use the horizontal zoom in combination with this to get more 'zooming' of the signal.

So basically, the difference between rising and falling mode, is to look (mainly) at the beginning or end of the cycle.

See also this pic:

from https://www.cs.tcd.ie/courses/baict/bac/jf/labs/scope/

MrM · Post by **MrM** » Sat Jun 24, 2006 9:45 am

Also nice link : http://www.virtual-oscilloscope.com/

See those cables below?
Connect one of them to the vertical input of channel I, and see what happens.

Happy measuring!!!

justified · Post by **justified** » Sat Jun 24, 2006 10:58 am

MrM wrote:Triggering on rising: the scope begins to draw the curve, when a zero crossing is 'noticed' and (!) the next signal is of a positive voltage (in real live think mV or uV)

Falling; the same conditions; screendrawing begins after a zero crossing and a negative value

Imagine you trigger a sine from a signal generator / function generator. Normally one measures in phase, so one uses 'rising mode'. If/when one wants to invert the phase on screen, all one has to do is switch to 'falling mode'.

cheers for good explanation, and what's good in s(m)exoscope that instead of zero you can choose any level crossing you want with a slider on the left.

Dozius · Post by **Dozius** » Sat Jun 24, 2006 6:35 pm

MrM wrote:Also nice link : http://www.virtual-oscilloscope.com/

See those cables below?
Connect one of them to the vertical input of channel I, and see what happens.

Happy measuring!!!

haha, it's almost like I'm back at the lab. Nice link.

good oscilloscope?