instantwow wrote:
> I recently purchased an oscilloscope on Ebay. It is a 100Mhz model. I
> was configuring the scope using the calibration output, which is a
> 1Khz 2 volt square wave. The horizontal line drawing on the scope
> looks good, however, the vertical trace ****tion on this wave is barely
> visible at the highest brightness setting. Is the normal, or is there
> a problem with the scope? Is this common with analog scopes? This is
> my first oscilloscope, so I’m not sure. Here’s a photo I took. Any
> ideas?
>
> http://www.flickr.com/photos/27262651@[EMAIL
PROTECTED]
>
> Thanks.
That's normal for an analog display, the raise time of the
square wave is so good that it's not allowing the beam in the
CRT to stay on a section long enough to fully charge the phosphorus.
You'll find other signals that are not raising so fast like your
test signal and the vertical line will be more visible..
You can make adjustments to the settings of the CRT controls to
help you a bit on the visibility of the line. Making it brighter is
not the answer.. If the scope has a LP (Low Pass) filter option, you
may want to try that. It will remove some of the square corners from the
wave how ever, it should improve on the visible problem.
A digital scope with LCD won't react like that.
http://webpages.charter.net/jamie_5"
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