Re: Amp output Z
- From: "Harry Dellamano" <harryd@xxxxxxxxxxxxx>
- Date: Tue, 12 Apr 2005 01:24:06 GMT
"Joerg" <notthisjoergsch@xxxxxxxxxxxxxxxxxxxxx> wrote in message
news:z0F6e.1871$dT4.115@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> Hello John,
>
> I believe Harry wants to verify the output impedance of the amp.
> Considering that it's in the 10ohm range and the load is a few hundred the
> required accuracy is a bit of a stretch for the AC circuitry of many DVMs.
>
> Regards, Joerg
>
> http://www.analogconsultants.com
We are trying to measure the output Z across the 600 ohm resistive load at
400HZ. We measure about 13 ohms using the DVM method and the formula given
previously. No complex math is necessary because we are looking across a
stepped resistive load. We step the 600 ohm load to 300 ohms to obtain delta
Eo.
By inspection the output Z is 600 ohms resistance in parallel with a 70
ohm reactance. Is that not about 60 ohms impedance?
What am I missing?
Harry
.
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