how to find impedance Orcad? - Electronic Circuits Projects Diagrams Free

wuid · 8th June 2009, 07:06 PM

just begining to learn orcad in college and i got this final assigment.
in the attached file is the circuit i have to analyze.

the first assigment is to plot Veq and Zeq.
i am sure that Veq is well plotted (red line)
but not sure for Zeq (purple line)

can someone help me ?

crutschow · 8th June 2009, 07:58 PM

The assigment is a little confusing. Does ZL indicate where your are supposed to determine Zeq?

If so then you have to divide the voltage across the capacitor by the current from the current source, which I believe you did.

wuid · 8th June 2009, 08:16 PM

yes ZL is Zeq we told so.

wuid · 8th June 2009, 08:21 PM

if the graph is o.k , how do i suppose to recognize this (ZL) component ?

crutschow · 8th June 2009, 10:46 PM

For the particular circuit and frequency of measurement shown, the apparent impedance varies over the waveform period, it is not a constant. So you can't determine a fixed value for the impedance. The impedance is time varying which is shown by the waveform.

To get a constant impedance you would have to set Vs=0.

In normal engineering practice you would not determine the impedance of the circuit shown with Vs active. In other words, it appears to be an odd academic problem.

wuid · 9th June 2009, 05:50 AM

as i put 0(zero) for Vs i got the graph of Zeq like a Tangent grapgh is that more normal behavior ?
still can i determine that ZL is a coil or capacitor maybe a simple resistor?

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8th June 2009, 07:06 PM	#1
wuid	how to find impedance Orcad? just begining to learn orcad in college and i got this final assigment. in the attached file is the circuit i have to analyze. the first assigment is to plot Veq and Zeq. i am sure that Veq is well plotted (red line) but not sure for Zeq (purple line) can someone help me ? Attached Thumbnails

8th June 2009, 07:58 PM	#2
crutschow	The assigment is a little confusing. Does ZL indicate where your are supposed to determine Zeq? If so then you have to divide the voltage across the capacitor by the current from the current source, which I believe you did. __________________ Carl Curmudgeon Elektroniker

8th June 2009, 08:21 PM	#4
wuid	if the graph is o.k , how do i suppose to recognize this (ZL) component ?

8th June 2009, 10:46 PM	#5
crutschow	For the particular circuit and frequency of measurement shown, the apparent impedance varies over the waveform period, it is not a constant. So you can't determine a fixed value for the impedance. The impedance is time varying which is shown by the waveform. To get a constant impedance you would have to set Vs=0. In normal engineering practice you would not determine the impedance of the circuit shown with Vs active. In other words, it appears to be an odd academic problem. __________________ Carl Curmudgeon Elektroniker

9th June 2009, 05:50 AM	#6
wuid	as i put 0(zero) for Vs i got the graph of Zeq like a Tangent grapgh is that more normal behavior ? still can i determine that ZL is a coil or capacitor maybe a simple resistor? Attached Thumbnails