Blair wrote:I tried, my understanding, of your suggestion yesterday. I hit the "Horiz" button to kill the constant line, but when I inject signal, the sine waves appear anyway. Just lighter.
Is there a writeup about this method?
When you say .707 points. Is that the -3db point in voltage/amplitude? Say I have 1V out, and drop the freq a few db, and measure .293V. Is that where my "knee" is?
Thanks!
Blair
My scope doesn't have a seperate button for Horiz. In/Out. It has a [X(-)Y] setting on the sweep time control at the end.
It's .707v only for a 1v wave. Otherwise it's a percentage of the reference voltage in. You can have anything on the scope and if it drops to .707% of the reference, then that is the 3dB down, (half power) point. I like to use 4 squares up. If it only drops to 3 squares, it's 75%. Otherwise, you got do all the danged "times this and times that, .1 x 3 squares and 2 ticks, whooeey.."
Headed for Tishomingo to sing in a can...