[volt-nuts] How to use a Dynamic load

[J. Forster]

You use the load to vary the load current, then monitor the supply output
Voltage and Current.

The Source Output Impedance is the (P-P Voltage)/(P-P Current).

If the voltage and current are not in-phase, the Source Impedance is nopt
purely resistive.

If the V and I waveforms are not identical, except for phase shift and/or
amplituse, so,mething is non-linear.

Acme and Kikisui make nice loads, BTW.

-John

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> I do not know if it is of topic but I made a dynamic load, jut for fun as
> an experiment and i think it is handy for testing caps, finding possible
> power supply problems, measure RRT from diodes,   Determine unknown
> transformer specs ect. It was just two matched powerfets, 4 opamps and a
> few other parts.  I can modulate it internal with sawtooth or squarewave,
> use a contant resistant or external modulation.
> It works great but to be honnest , i have no clue how to interperted the
> scope pictures I see measuring over the powersupply and over the shunt
> resistor.
>
> But I read you can test capacitor quality with it, measure Ri of a supply
> and if I modify it use it to test battery chargers ( not to my intrest)
>
> I can find only a few schematics, probably use the wrong search terms. And
> i can not find pictures about how to read the scope pictures and calculate
> parameters.
> I can find out maybe by studying the pictures and do some math but that is
> like inventing th wheel again.
>
> Does some one know some good links to application notes of literature or
> sites ?
>
> Sorry if this is of topic, but It involves measuring, Volts and I'm a nut
> ;-)
>
> Fred PA4TIM
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