Re: signal generator impedance


krishmaniac@xxxxxxxxxxx wrote:
I have a signal generator with its output BNC labelled 50onms. What
does it mean? Does it mean it has pure resistive 50ohms source
impedance ? or Does it mean i have to terminate the coax i use with
50ohms from where i tap the signal?

Think of your signal generator as a perfect zero impedance AC source
with a perfect 50 ohm resistor in series. If you don't terminate it
with 50 ohms, the voltage indicated on the generator will be half that
actually delivered to a perfect infinite impedance load. The coax
should be 50 ohms as well. You might notice ringing in square waves
without the matched coax and load.

.

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