Maker Pro
Maker Pro

Peak to Peak

E

Eeyore

Jan 1, 1970
0
Ppppfffftttttt..... I was *always* right on this point of course !

Graham
 
F

Fred Bartoli

Jan 1, 1970
0
Eeyore a écrit :
Such a method is indeed limited to situations where the frequency is known.

Graham

Obviously (hem) not.

V = a sin(wt)
V'= a w cos(wt)
V''=-a w^2 sin(wt)
w=sqrt(-V''/V)

a= V''/sqrt(-V''/V)
 
E

Eeyore

Jan 1, 1970
0
The measurement is instantaneous but it takes a few us to calculate the result.

Graham
 
E

Eeyore

Jan 1, 1970
0
Fred said:
Eeyore a écrit :


Obviously (hem) not.

V = a sin(wt)
V'= a w cos(wt)
V''=-a w^2 sin(wt)
w=sqrt(-V''/V)

a= V''/sqrt(-V''/V)

You've come up with a smarter method still ?

I'm intruiged. I need to think about that.

Graham
 
F

Fred Bartoli

Jan 1, 1970
0
Fred Bartoli a écrit :
Eeyore a écrit :

Obviously (hem) not.

V = a sin(wt)
V'= a w cos(wt)
V''=-a w^2 sin(wt)
w=sqrt(-V''/V)
Right 'til now
a= V''/sqrt(-V''/V)
That one is plain stupid.

But:
a^2 = V^2 + (V'/w)^2

Then:
a=sqrt(V^2 - V'^2 * V/V'')
 
J

John Larkin

Jan 1, 1970
0
I don't check my work very carefully for newsgroup postings, since the
penalty for being wrong is zero. I'm a lot more careful when it
matters, which is how I get to sell rev A of most of my boards.

John
 
J

John Larkin

Jan 1, 1970
0
I don't check my work very carefully for newsgroup postings, since the
penalty for being wrong is zero. I'm a lot more careful when it
matters, which is how I get to sell rev A of most of my boards.

John


As regards being wrong, I and one of my design engineers are working
on the architecture of a new product. We visited the customer last
week and got an idea of his problems, and we promised him a proposal
by this coming Friday. Accordingly, we have allocated Monday, Tuesday,
and Wednesday specifically to being confused and wrong as much as we
possibly can, and we're doing mighty fine so far. I've been learning
stuff about NCOs that I never suspected, and discovered that you can
buy a might fine 16-bit DAC for $3 nowadays and that Xilinx has some
ultracool logic blocks for free.

Sometimes it pays to be wrong.

John
 
J

John Fields

Jan 1, 1970
0
As regards being wrong, I and one of my design engineers are working
on the architecture of a new product. We visited the customer last
week and got an idea of his problems, and we promised him a proposal
by this coming Friday. Accordingly, we have allocated Monday, Tuesday,
and Wednesday specifically to being confused and wrong as much as we
possibly can, and we're doing mighty fine so far. I've been learning
stuff about NCOs that I never suspected, and discovered that you can
buy a might fine 16-bit DAC for $3 nowadays and that Xilinx has some
ultracool logic blocks for free.

Sometimes it pays to be wrong.
 
B

Bob Myers

Jan 1, 1970
0
Damnation, you're right. I was assuming the frequency
was known.

Bob M.
 
F

Fred Bartoli

Jan 1, 1970
0
Bob Myers a écrit :
Damnation, you're right. I was assuming the frequency
was known.

Bob M.

No, he's not right. Well, if we consider that's a sine wave.

Here's what I replied to Graham:
Obviously (hem) not.

V = a sin(wt)
V'= a w cos(wt)
V''=-a w^2 sin(wt)
w=sqrt(-V''/V)
But:
a^2 = V^2 + (V'/w)^2

Then:
a=sqrt(V^2 - V'^2 * V/V'')
 
C

Chris Foster

Jan 1, 1970
0
It will not.

John

It will, It will not, It will, It will not, It will, It will not,
It will, It will not, It will, It will not, It will, It will not,
It will, It will not, It will, It will not, It will, It will not,
It will, It will not, It will, It will not, It will, It will not,
It will, It will not, It will, It will not, It will, It will not,
It will, It will not, It will, It will not, It will, It will not,
It will, It will not, It will, It will not, It will, It will not,
It will, It will not, It will, It will not, It will, It will not,
It will, It will not, It will, It will not, It will, It will not,





Nanner nanner boo bo.
 
C

Chris Foster

Jan 1, 1970
0
When we say there is 110V AC, is that peak to peak?

No, that is RMS or Root Mean Square.



To calculate peak, mult RMS by 2 x (Square root of 2) (approx 1.414)

Then to get paek-to-peak, multiply peak by 2
 
J

John Fields

Jan 1, 1970
0
No, that is RMS or Root Mean Square.



To calculate peak, mult RMS by 2 x (Square root of 2) (approx 1.414)

Then to get paek-to-peak, multiply peak by 2
 
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