Measuring the resistance, capacitance and inductance

[flye2012]

Hello,
I would like to make a program for measuring the resistance of a resistor, the capacitance of a capacitor OR inductance of a coil.
- To measure the resistance, I have to use Ohm's law (U=RI).
- For the measurement of capacitance of a capacitor OR inductance of a coil I want to use the frequency response of a series RLC circuit. (f = 1 / (2pi * root (LC)).

For this I have the NI 4070 (multimeter), the NI 5402 (GBF) and the NI 5114 (oscilloscope).

I wish I essentially help to measure the capacity and inductance.

Thank you in advance.

---

Bonjour,

je souhaite réaliser un programme permettant de mesure la résistance d'un résistor, la capacité d'un condensateur OU l'inductance d'une bobine.

- Pour mesurer la résistance, je dois utiliser la loi d'ohm.

- Pour la mesure de la capacitéé d'un condensateur OU de l'inductance d'une bobine je souhaiterais utiliser la réponse en fréquence d'un circuit RLC série. ( f = 1/(2pi*racine(LC)).

Pour cela je dispose de la carte NI 4070 (multimètre), de la carte NI 5402 (GBF) et de la carte NI 5114 (oscilloscope).

Je souhaiterai essentiellement de l'aide pour la mesure de la capacité et de l'inductance.

Je vous remercie d'avance.

[crossrulz]

Shame you didn't get the PXI-4072.  It has the LC Meter built in.

[flye2012]

I am a student, and as you can imagine the schools are not necessarily subsidies. However, I expect not help debate on the hardware on which I have to work.

[crossrulz]

Well the resistance is easy enough.  The 4070 can do that already.  Just set it to 2-wire resistance.

I'll have to dig into the theory of how to measure the L & C again.  It has just been too long.

[johnsold]

To use the resonant frequency method you need a standard indcutance and a standard capacitance.  You probably need several of each with different values to cover a wide range of possible unknowns.  Then you also need to be able to find the resonanat frequency, which may not be as easy as it seems like it should be.

I would consider using a voltage divider and quadrature detection. A wide range of values of resistances (with low reactance) with good accuracy and precision is much easier to obtain.  This also allows you to measure the losses in reactive components.  You can use one measurement set up for resistance, capacitance, and inductance.

Lynn

[morten.munch]

Hi.

Did you succede in this mather. I have a simular wish just using NI's Virtual Bench and using the 'simple' math's by calculating on a RL circuit. I hope to hear from you.

Br. Morten.