[Test-Equipment] scope delta cursor adjustment

[Dick KF4NS]

I have a TEK 2465 and was making some test comparisons with my
multi-featured DMM. I had never really done this before so had never
paid any attention to the delta cursor positioning.

Before I dig into the service manual for adjustment procedure I better
pick some brains better than mine.

I found that I had been setting the cursor at the very peak of the
trace and the result was a higher voltage reading of the 1khz sine
wave than should be. Example: for a DMM reading of 1.027V RMS
I get 3.24V P-P on the scope. If I overlap the cursor and the peak I
get the comparable reading. I realize that this delta feature is not
a precision test for voltage. I used both the X10 probe and a quality
section of 50 ohm coax. I used both 1Mohm GND and 50ohm DC input
coupling. Result is always the same.

I also realize that the cursor is not a perfect flat, straight line so
maybe
I am making a mountain out of a mole hole. After all, the reading is
only 0.34V too high. If I use the recommended 5 divisions on the
display it is better but I normally do not expand the trace that much.

Opinions please.

73, Dick KF4NS
St Petersburg, FL 33714 USA
Keep The Glow!