[R-390] OT: I bought a 'scope

[Shoppa, Tim]

> I copied the picture locally and examined its properties.  It turns out the
> image was shot at 50ms
> (1/20s) so I looked back at the photos and noticed the delay time "UNCAL"
> lamp is illuminated.  
> Given a 50ms shutter speed and the trace covering approximately 8/100 of the
> horizontal scale, then (if I did the calculation correctly), the sweep speed
> would be about 625ms.

> I'm not all that familiar with this scope, but I assume the sweep can be
> slowed to that speed - at least in the 50ms setting.  Is this a correct
> assumption?  I ask because I hope the scope is not too broken (if broken at
> all).

I'm not sure if it's a factor of ten in the "good" direction, but there's a button
Under the screen if you hit it it stretches the horizontal axis by times ten. It produces
Confusing results until you figure out that the button is engaged. My kids come in my
Shop and hit that button all the time and it can take me a couple of minutes to figure it out
Sometimes (and I am no newbie to the 465).

The fastest and slowest sweep rates can be chronic problems on any scope and while the Teks
Are good they can get out of whack too.

I know that calibration is important to many, but far and away the most value in a scope
Comes not from any absolute calibration but the fact that you can get a picture of a waveform
Regardless of whether the scales are right or not.

Tim.