On Fri, 10 Feb 2006 13:01:06 -0800, Tim Wescott
wrote:

Eric R Snow wrote:

Thanks all for the info so far. Now another one. The probe is set at
1X. The volts/div is set at 50 m. the time/div is set at .1 ms. So
this tells me that each vertical division is 50 millivolts and each
horizontal division is .1 milliseconds. The probe is clipped to the
calibration bar. This bar is labeled as 300 mV 30mA ~1KHz. The display
shows the square wave with 6 divisions vertical and just over 10
divisions horizontal. Using the VAR knob in the center of the time/div
knob I can adjust the display to show exactly 10 divisions. When this
is done is the display correct? Or is it the calibration bar that is
wrong?
Thanks,
Eric

Assuming that the time base is correct your scope timebase is off. You
should be able to set the sweep knob in the 'cal' position and have the
thing line up exactly. There will probably be an internal adjustment.

I'd try to get a manual for that scope, and a time standard that'll give
you a second opinion.
I have ordered the manual. And downloaded a copy from Ig. I am still
looking for a book that is all about using oscilloscopes and is aimed
at beginners.
ERS