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from the scope capture in post #21
integrated result that i want is the same shape with original current pulse.
because of the output of my sensor is (v=k*di/dt).
from bode plot in Matlab by this equation
that is transfer function of rogowski coil multiply transfer function of rc integrator.
where
M=96.774 nH
L0=6.1935 uH
R0=0.657 ohm
C0=19 pF
Rs=300 ohm
Rw=50 ohm
R=1 kohm
C= 82 pF
this is code
a=0.0394 ; inner radius
b=0.0804...
I have changed my setup to get a less resonant.
this is diagram of my setup.
-use copper bar instead all of wire (lower parasitic inductance).
-all of pot or terminal are nicely solder.
-all of element were set on insulator (prevent noise from table).
-oscilloscope was connect with isolating...
Thank you
inner radius 4 cm, outer 8 cm and height of core is 1 cm
*I measured the original pulse by calculation voltage across shunt resistor(non-inductive)
*Rd = (1/2)*sqrt(L0/C0) (lowest oscillation)
*It can be moved closely
- - - Updated - - -
Dear albbg
inner radius 4 cm, outer 8 cm and...
I calculated from the equation of Mutual inductance of Rogowski coil M= (u0*N*h*log(b/a)/2pi
a is inner radius, b is outer radius, h is height of core and N is number of turns
Thank you very much.
I will test all of your advices.
https://www.youtube.com/watch?v=MMmHsP6DhUE&feature=youtu.be
and from this video, can you tell me why the response is changed when I slightly touch, move or shift the tank, wire or BNC joint
From this figure, the red signal is original pulse and the others(blue signal) is integrated result.
As you can see, there are an oscillation in the integrated graph
I used RC integrator which is its work band almost cover spectrum of original pulse (11-70MHz).
My advisor told me, "I used...
The LCR meter detects the voltage, current and phase angle of DUT. Thus, The DUT can be represented as L, C or R. But, why we have to match the frequency of LCR meter to the frequency that DUT is tuned for? When we change the test frequency, the reactance must be changed. Causes the voltage...
Ohhh I get it. Thanks a lot, and I'm sorry to waste your time.
1. If I use numerical integration, the scale factor is only M.
2. If I use an external integrator, the scale factor is (M/T).
Is that correct?
For the second choice, How do I know the value of L or C of integrator, if I want the...
Yes, the scale factor that you told is M (Vs/A) right? (multiple with dI/dt, we will get unit in Voltage). But, mine is not.
Rogowski coil is current transducer but it give the output in unit of voltage. So the scale factor that I mean is some factor that multiple with output of the...
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