[sdiy] cute hand held scopes on eBay

[Tom Wiltshire]

On 23 Feb 2012, at 15:22, Richie Burnett wrote:

>>> The DSO nano is fairly well-known and was talked about on here a few weeks
>>> ago. I have one; it's OK but a bit cheesy given it's single-channel.
> 
> I think the linear interpolation between sample points would be my biggest
> gripe!  For example, this picture of a 500kHz sinewave:
> 
> http://toolboom.com/content_image/content/5210/IMG_2417.JPG
> 
> from the many photos at this page:
> 
> http://toolboom.com/en/Articles/DSO-Nano-DSO201-Pocket-Sized-Digital-Oscilloscope-Review.html
> 
> I know this is a dirt-cheap low-end product, and i'm spoiled having a Agilent
> DSO on my desk here.  However, if someone would program proper sinc
> interpolation into this it would at least be able to display the sampled
> waveforms correctly up to its front-end's bandwidth limit.

I quite like the fact that my own digital scope just puts linear sections between samples. It makes it obvious that I'm zoomed in to the limit of the data, and that I shouldn't go making assumptions about what's inbetween those few points. Dot mode does this too, but the display isn't so clear.
If I had a beautiful-looking sinc-interpolated image to look at, I might well start confusing it with reality, and I definitely wouldn't be able to tell where the actual datapoints were.
Tastes differ, I guess.

Tom