Re: Amp output Z
- From: Jim Thompson <thegreatone@xxxxxxxxxxx>
- Date: Mon, 11 Apr 2005 20:59:38 -0700
On Tue, 12 Apr 2005 01:24:06 GMT, "Harry Dellamano"
<harryd@xxxxxxxxxxxxx> wrote:
>
>"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
>
Zee math ;-) I'll write it down and scan it in the morning.
...Jim Thompson
--
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