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AWG output amplitude

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AWG output amplitude

Postby raman » Tue May 03, 2011 12:41 pm

In PicoScope 5200 series AWG the output impedance is specified at 50 Ohm. However, I can measure the correct signal amplitude only when the output has a high-impedance termination. Is the amplitude specified for 50 Ohm or rather for 1 MOhm?
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Re: AWG output amplitude

Postby ziko » Wed May 04, 2011 4:44 pm

Hi yes using no termination the voltage will not be attenuated, using the 50ohm terminator the voltage will be divided as it becomes a potential divider (divide by 2).

The purpose of the termination is really for signals with high frequency components, the impedance matching is used to minimize reflections without it the original signal will be altered, so for example a square wave might have overshoot.

Kind regards
Ziko

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Re: AWG output amplitude

Postby raman » Tue May 24, 2011 9:12 am

Hi,

Thanks for the answer!

In fact, I don't use the termination, but I connect the output of the generator to the transducer having 50Ohm input impedance. Do I understand right, that in this case the amplitude of the (RF) signal is the same as with a 50Ohm termination?

Sincerely,

Raman
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Re: AWG output amplitude

Postby ziko » Fri May 27, 2011 1:22 pm

Hi Raman,

That is correct you should not have to use a 50Ohm terminator since both the Sign Gen output and the DUT input impedance are the same.

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