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Well how did you calculate this tho? 500mS X 10 divisons on the 0-scope = .1 sec sweep speed?
Well Billy as I mentioned, there is no formula. Let's say I have a 1 KHz square wave I want to display on my scope. Well I know that Time and Frequency are reciprocals so the time for 1 KHz is T = 1 / F so 1 / 1000 = .001 Sec. (1 mS). Well if I set my scope up for 1 mS / Div and I have 10 horizontal divisions I will have one repetition of my wave form per division and display 10 repetitions on my screen. If I really want to see and measure my waveform it is hard to view only one with 10 on the screen so maybe I'll stretch it out a little and use a faster sweep. I can move to .5 mS / Div so now my 10 divisions represents 5 mS. I should see 5 repetitions of my 1 KHz signal. Good but not good enough, I want to better see 1 repetition. I now set my sweep time to .2 mS / Div. Now my 10 divisions represents 2 mS. I should see 2 full repetitions of my signal. Finally if I set my sweep speed to .1 mS / Div my whole 10 divisions should represent 1 mS. I should see one full complete repetition of my 1 KHz signal. The problem is that if my 1 KHz is actually 950 Hz then my time becomes 1/950 = 1.05263 mS so my single repetition will exceed my 10 divisions that I can measure.
If my sweep setting is for example 5 mS / Div I know I have 10 horizontal divisions so my entire sweep represents 10 Div * 5 mS = 50 mS.
There is no formula to determine the ideal sweep speed setting. The scope is a tool and like any tool it can do many real nice things. However, also like any tool you need to understand it and learn how to use it. You also need to know its strong and weak points. There is no formula to tell you, for example, that when looking at low frequencies to use DC coupling, you learn that. I suggest you watch rumpfy's link and try a Google of Oscilloscope Basics to learn more about scopes.
Ron