Well that explains it...I've been running with those lights on....no =
wonder it was hard to figure out!  I need to play when I get home!!!
I'm not eager to calibrate it....just get the signals where they make =
sense....if it's calibrated as is I'm going to leave that alone!!
>>> olin_piclist@EMBEDINC.COM 12/24/03 08:53AM >>>
Tim Hart wrote:
> Now that you mention it....those lights you mentioned are on...all
> three of them!

Those lights are labeled UCAL, which stands for "uncalibrated".  They are
warning you that whatever units/division the knobs are set to isn't what =
the
scope is displaying.  These knobs are NOT for calibration.  That is done
insdide the scope with a screw driver or calibration tool.

The purpose of the knobs is to allow you to align a signal with the =
division
lines on the scope.  This can be useful when you want to look at parts of
the signal with respect to other parts.  In return for being able to =
squash
the signal to fit whatever you want, you give up calibration.  In other
words, you are no longer seeing 1uS/div, 2V/div, or whatever the knobs
claim.  The UNCAL lights are just a reminder that you've done this and =
that
you shouldn't be using the display for quantitative measurement.

Leave all the VAR knobs in the calibrated position unless you are doing
something where you specifically want to squash the display, then put them
back as soon as you are done.  The most common example of this for me is
when looking at an RS-232 signal.  It can be useful to line up a character
to that each bit exactly fits within one division.  None of the fixed =
sweep
settings allows that for common baud rates, so I set it to the next faster
sweep setting and diddle the VAR knob until the bits line up.


*****************************************************************
Embed Inc, embedded system specialists in Littleton Massachusetts
(978) 742-9014, http://www.embedinc.com=20

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics