I have question about R L Mathematics
On 1/28/2014 2:12 PM, John S wrote:
Hi, Mike -
On 1/28/2014 1:14 PM, amdx wrote:
On 1/28/2014 1:03 PM, amdx wrote:
I have beads* on a coax and want to know the R and the L.
I have measured the R at 3.85MHz, It is 3,350 ohms.
I will assume that Z is 3350 ohms at 3.85MHz.
I have also measured the phase shift, voltage leading
by 17ns. The period of 3.85Mhz is 260ns.
I want to calculate the impedance of the reactance.
The impedance of the reactance (alone) IS the reactance (itself).
Can anyone solve this for me?
I will try.
I would like to see the math, because I want to measure again
at 7.5MHz.
My first step was to find the phase angle, 23.5*.
Do we agree there?
We do (based on your numbers)...
Z = 3350 @ 23.5 degrees.
R = Z * COS(23.5) and
X = Z * SIN(23.5)
Therefore, R = 3072 ohms
and X = 1336 ohms
As a sanity check, Z = sqrt(R^2 + X^2) = 3350
Good!
HTH,
John S
Thank you John.
Mikek
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