G = generator

V

_{G}=generator open-circuit voltage

R

_{G}=generator internal resistance

V

_{L}=generator on-load voltage

RL=load resistance

*V*and

_{G}*R*parameters, follow this procedure: -

_{G}- Before starting the generator, measure the resistance across its terminals using an ohmmeter. This is its DC internal resistance

*R*.

_{GD}- Start the generator. Before connecting the load

*R*, measure the voltage across the generator's terminals. This is the open-circuit voltage

_{L}*V*.

_{G}- Connect the load as shown in the diagram, and measure the voltage across it with the generator running. This is the on-load voltage

*V*.

_{L}- Measure the load resistance

*R*, if you don't already know it.

_{L}- Calculate the generator's AC internal resistance

*R*from the following formula:

_{GAC}RGac = RL(VG/VL - 1)

Note 1: The AC internal resistance of the generator when running is generally slightly higher than its DC resistance when idle. The above procedure allows you to measure both values.

For rough calculations, you can omit the measurement of *R _{GA}* and assume that

*R*and

_{GAC}*R*are equal.

_{GDC}
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