Determining the relation between resistance and heat (printed electronics)

Discussion in 'Test & Measurement Forum' started by daanmicro, May 16, 2018.

  1. daanmicro

    Thread Starter Member

    Nov 15, 2017
    30
    1
    Hi there!

    First of all i'm gonna excuse myself for my English skills, they're not that bad but perhaps it generates some sympathy.:cool:

    I'm working on a Printed Components Characterization project, and right now i'm investigating the heating of inkjet printed silver ink tracks. For this i now own a function generator, a silicone heating mat, oscilloscope, and all the cables, clamps, probes etc ofcourse.

    I know (or guess(?)) i can set up a characterization of R as a function of T and R as a function of t, t is in this case the duration of a pulse (incoming crappy paint drawing!) . Someone has told me i'll have to combine the t of the voltage pulse on the scope, when it reaches a certain equilibrium, with the resistance R.

    By the way i've got no electrical background so i'm sort of new in this scene. Would anyone be able to help me further with this case?

    How do i start with these measurements?
    Which voltages / currents do i need?
    How the hell can i convert an R(T) and R(t) measurement to a useful characterization, after which i can determine/estimate the heating with a certain pulse (known current and pulse duration).


    58841 Thanks in advance!

    Kind regards tekeing rt.png IMG-20180314-WA0007.jpeg
     
  2. DECELL

    Member

    Apr 23, 2018
    47
    11
  3. kubeek

    Expert

    Sep 20, 2005
    5,193
    975
    So what is it exactly that you want to characterize? Is it the properties of the tracks themselves, or in combination with some known substrate and ambient conditions?
    In your last thread you were looking for a thermal coefficient and current carying capability.
     
  4. daanmicro

    Thread Starter Member

    Nov 15, 2017
    30
    1
    Yess, i can understand your curiosity. I'm characterizing different components like silver tracks, vias, capacitors. The properties that are desired to be tested are Resistivity, CCC, Capacity/inductance, Thermal conductivity, quality and probably some more. So i hope you can see the full picture, that there's a lot to be tested and a lot is unknown yet.

    So my whole project is a pretty big mixup, divided in different measurement set-ups which will have to be built first. I'm really willing to dive into this stuff, but for now my knowledge is pretty limited on this subject.

    Edit: The substrate won't vary much.So this is mostly about the tracks themselves.
     
  5. daanmicro

    Thread Starter Member

    Nov 15, 2017
    30
    1
    But anyhow, could anyone tell me how i convert an R(T) and R(t) measurement to a useful characterization, after which i can determine/estimate the temperature as a function of a certain pulse duration?
     
  6. ArakelTheDragon

    Active Member

    Nov 18, 2016
    540
    25
    I am not certain I understand, but what you want is to see how the temperature will behave depending on the pulse length?

    If so, what you need is a slope which shows the temperature rises until it reached its nominal and then you have a straight line until the end of the impulse. When the impulse shuts down you have a slope until the temperature falls down and then the next impulse does the same. This looks like to me as an attempt to estimate the efficiency of some product. Which means you think manufacturers sell you junk intentionally, so they can tell you buy the better one, and you are right. Sometimes they decrease the quality on purpose so they can tell you buy the new model.
     
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