[ProAudio] Microphones question

Jim Brown jim at audiosystemsgroup.com
Fri Jun 11 13:57:01 PDT 2021

On 6/11/2021 1:46 PM, Bill Whitlock via ProAudio wrote:
> If you have access to an LCR impedance bridge, it can resolve the 
> impedance into resistive and inductive reactance components - a much 
> quicker process.

Yes, and nearly 40 years ago, we were getting complex impedance data 
from TEF sweeps, with a suitably high value resistor in series with the 
sweep. The method would also work with dual channel FFT. I've used the 
same technique with a Vector Network Analyzer at RF to measure the 
common mode impedance of chokes to suppress common mode current on 
antenna feedlines and to suppress RFI to/from consumer products and in 
my ham station.

Jim Brown

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