[minima] Re: Experimenting with the crystal filter
- From: Clark Martin <cmmac@xxxxxxxxx>
- To: "minima@xxxxxxxxxxxxx" <minima@xxxxxxxxxxxxx>
- Date: Wed, 22 Jan 2014 01:38:59 -0800
Sent from an iPhone, don't ask whose.
> On Jan 22, 2014, at 1:34 AM, Thomas Sarlandie <thomas@xxxxxxxxxxxxx> wrote:
>
> I am using an ad9850 and I measured the output impedance to be 100 ohms. I
> simply measured the output voltage in open circuit (519 mV rms) and the
> output current in short circuit (5.1 mA). This is as simple as it gets but I
> think this is correct.
A better way is to measure the open circuit voltage then apply a resistive load
to it and adjust the resistance till the voltage is one half the open circuit
voltage. The load resistance will be equal to the source impedance.
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