Capacacitance and Conductance Measurments in Multisim

[Undergrad Student]

I was wondering, how can I find Capacitance and Conductance measurments. 

I have a circuit with a resistor (100kohms), a capacitor (1microF), and AC current 1VAC.

I have to find the capacitance and conductance at 200+ frequencies.  (e.g. 5 Hz, 10 Hz, 20 Hz, 30 Hz, 40 Hz, 50 Hz, ......... ect.)

I put together the circuit but but have no idea what i should use to find these measurments.

Please help!

thanks

[_user32]

Undergrad,

I am assuming that you want to measure the overall complex impedance over these frequencies (resistance, reactance) - this you can measure.

This can be expressed as magnitude and phase (A) or as a complex number (B)...

(A)   Z = |Z|e^ (j(theta))

(B)   Z = R + jX

You can use simple math to convert (A) into (B) and vice versa...

There are several ways to do measure this in Multisim.  I would check out one of the 2 ways.

1. Using AC Analysis Sweep

from the Multisim menu Simulate -> Analyses -> AC Analysis

If you measure the voltage across the AC current source in your circuit, the voltage measurement will be the complex impedance in Magnitude / Phase form.

Here is a result from a simple RC circuit.

2. You can also use the Impedance Meter instrument (Multisim v11)...

from the menu, Simulate -> Instruments -> LabVIEW Instruments -> Impedance Meter

Take out the AC current source and wire the instrument (+/-) across the nodes.   The measurement shows the impedance as Resistance (R), Reactance (X) and the magnitude |Z|.

Here is the readout in the same RC circuit.

In this form, the complex impedance at a certain frequency Z = R + jX

Note that the |Z| readout at F=10 Hz on the meter and the cursor showing magnitude (|Z|) at 10Hz on the previous AC sweep closely match.

Regards,

Pat Noonan

[Undergrad Student]

Thanks for you responce, but i dont think thats what i was looking for. 

I have a R-C parallel circuit with its resistance 100kohms and its capacitor 1microF.  My AC current is 1 VAC.

from this i simply need to find my capacitance measurments and conductance measurments at various frequencies.

If someone could tell me what Instrument I could use or something to find these measurments that would be great.

thanks again.

Attached i have a file that shows you my circuit