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How to obtain Electrical Characteristics/Model of a lump of Powder ?

  1. Jan 10, 2013 #1
    How to obtain Electrical Characteristics/Model of a lump of Powder ??

    Dear All,

    I have some powder given to us by a chemical engineer. Now, i lumped this in a syringe and connected wires on both sides.

    Can you give me an idea of an experiment that I can conduct to provide me with the electrical model of the powder, i-e, the resistance, inductance and capacitance , so i can construct an equivalent circuit for this element.

    Thanks in advance,

    :)
     
  2. jcsd
  3. Jan 10, 2013 #2

    mfb

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    Staff: Mentor

    Re: How to obtain Electrical Characteristics/Model of a lump of Powder ??

    A powder? I would expect that inductance and capacitance is negligible, and resistance dominates.
    You can try to build a resonator with an additional coil to measure capacitance (via the resonance frequency), but don't expect proper results. In the same way, it would be possible to measure inductance.
     
  4. Jan 10, 2013 #3
    Re: How to obtain Electrical Characteristics/Model of a lump of Powder ??

    I am sorry can you specify how can i build a resonator with this set-up ?

    is there no other more reliable manner to form this experiment ?
     
  5. Jan 10, 2013 #4

    berkeman

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    Re: How to obtain Electrical Characteristics/Model of a lump of Powder ??

    Can you say more about what you overall task is? Why are you wanting to electrically characterize the powder? What are you thinking about using it for? Will you be packing it into an axial tube like that for use? Will the tube be hermetically sealed, or will humidity be able to change the characteristics of the component?

    What electrical test equipment do you have available to you? Do you have access to an Impedance Analyzer instrument, like an HP 4194 or similar? What about signal generators and oscilloscopes?
     
  6. Jan 11, 2013 #5
    Re: How to obtain Electrical Characteristics/Model of a lump of Powder ??

    I have some amounts of powder inserted in a syringe at a specific pressure. It is tighly packed and has two wires on both sides connected to it.

    I am just looking for a way to know the resistance, inductance and capacitance through this element. And i want to know if there is any way to determine the equivalent circuit of this lump ?

    is that clearer ?
     
  7. Jan 11, 2013 #6

    berkeman

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    Re: How to obtain Electrical Characteristics/Model of a lump of Powder ??

    No, it is not. Please answer each of my questions that I asked. Thank you.
     
  8. Jan 11, 2013 #7
    Re: How to obtain Electrical Characteristics/Model of a lump of Powder ??

    How accurate should measurements be?
    The measurements will probably depend on the voltage and frequency the powder is tested at.

    For resistance use a variable voltage DC power supply, a current meter to measure the current and a volt meter to measure the voltage.

    If the powder is not magnetic (Check with a magnet) then the powder probably has no effect on the inductance.

    Check the capacitance with a capacitance meter or a LCR meter.

    Again the results are likely to vary with the test instruments used and the voltage and frequency tested at.

    Just curious, why do you want to know the resistance, inductance and capacitance?
     
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