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  • Volt Amp Meters 



    Volt meter connections specific to PV installations:-

     Diagrams A and B below show a circuit before and after connecting an ammeter:

    1.gif

    2.gif

    A > to measure current, the circuit must be broken to allow the ammeter to be connected in series.
     

    B > ammeters must have a LOW resistance

     

    Think about the changes you would have to make to a practical circuit in order to include the ammeter. To start with, you need to break the circuit so that the ammeter can be connected in series. All the current flowing in the circuit must pass through the ammeter. Meters are not supposed to alter the behavior of the circuit, or at least not significantly, and it follows that an ammeter must have a very LOW resistance.

     Diagram C and D shows the same circuit after connecting a voltmeter:

    3.gif
     

    4.gif
     

    C > to measure potential difference (voltage) the circuit is not broken to connect voltmeter in parallel.

    D > Voltmeter connects over a shunt resistive
     


    This time, you do not need to break the circuit. The voltmeter is connected in parallel between the two points where the measurement is to be made. Since the voltmeter provides a parallel pathway, it should take as little current as possible. In other words, a voltmeter should have a very HIGH resistance.

    The information posted herein has been compiled by Clean Energy Brands from OEM product data and reputable publications. All rights reserved!



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