Period is not another term for wavelength. It Muttley's head it may look like it. Period has the units of time and wavelength has the units of length. Time and length are unfortunately the "same" on your sillyscope, but period and wavelength are NOT the same entity.
My Emphasis.Period is not another term for wavelength. It Muttley's head it may look like it. Period has the units of time and wavelength has the units of length. Time and length are unfortunately the "same" on your sillyscope, but period and wavelength are NOT the same entity.
So you taught me R*C then give me something totally different
I can see the trigger is every 4s & the pulse is every 1s
but my ism looks like it has ripples where yours is smooth?
395.57ms wave length so I'm guessing 395.57KHz
cowboybob; No. And I'm going to have to eat a little crow here. Let's call it "wavelength in seconds" because said:is a distance traveled[/U], NOT a time. But for the time being, when you see the term "wavelength" think "wavelength in seconds", especially when we're using the scope.
Units are extremely important.
PS: CBB: You haven't taught him to use the cursors, or have you?
What about my RC calculation?
Why did I have to put 50ms where you put 5?
I don't know what I'm doing wrong, I'm getting 2.52799Hz not 25Hz, it's going to be that blinking decimal point again isn't it :-(
No. I wanted you to see a "practical" application of the use of an RC circuit. In this case, to control the "width" (duration, or time on [or off], for that matter) of a single pulse that is controlled by the RC circuit (≈1 second). From that understanding we can investigate (and already have, actually) how an RC circuit can control the "frequency".
It's only in this circuit that the frequency of the signal is controlled by the "period" of the trigger switch (4 seconds), which is 1 divided by 4, or 1/4 Hz, or 0.25Hz.
Let me rephrase your sentence: "...the trigger is every 4s (true, BUT) & the pulse is every 4s also. See below:
View attachment 62504 Please excuse the crude lettering.
I know this is tough, if for no other reasons trying to nail downall the definitions of all the terms. You'll eventually absorb it, so long as this instructor can quit making mistakes...
yes, i'm still getting beaten up by decimal point, as you say (hopefully) practise makes perfect
got it **broken link removed** they say simple things please simple minds **broken link removed**
i was seeing it as 395ms where really it was 3.95s
Muttley said:So wavelength is measured over distance
Frequency measured over time
Don't use the word over because it can mean divide as in 1 over 4 being 1/4.
So wavelength is measured in distance units
Frequency is measured in cycles/s or Hz (or some of the other variants such as MHz or KHz)
Velocity is just another word for speed, but km/h isn't appropriate. Science uses the kgs (killograms,meters, seconds) system or the cgs (centemeters, grams, seconds) system.
λ means wavelength & is measured in 'm'etres & 1000mm = 1M
λ is inversely proportional to Frequency (what's the symbol for 'f'?)
Meaning the exponent numbers go in opposite directions to each other
So 1Hz = 10 (ex 0)
1s= 10 (ex 0)
1KHz= 10 (3)
1ms = 10 (-3)
So wavelength is measured over distance
Frequency measured over time
No point going into velocity yet as we haven't covered phase
So again, to get frequency I measure like so:
1/ (time) = frequency
I did ask you to read up until "standing waves" here: https://en.wikipedia.org/wiki/Wavelength
λ = v/f. We haven't covered this at all. v is the speed in which it travels in the medium. In a vacuum, the speed of light is aprox 3.8E8 m/s.
λ is the wavelength. f is the frequency and v is the velocity. This number dictates how big antenna's have to be for radio frequencies. The antenna can be any evenly divisible multiple of the wavelength long. It's not uncommon to design antenna's for 1/2 or 1/4 wavelength. Telephone antenna's are really small and a TV antenna is much larger.
The other term you need to be familiar with is f = 1/period.
Just my methods. I will (eventually) get around to the scope cursor demo.
Very good. Suddenly, you've got it. Very, very good.
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?