[ProAudio] Microphones question
jim at audiosystemsgroup.com
Sat Jun 12 12:50:20 PDT 2021
On 6/12/2021 9:15 AM, Dan Lavry via ProAudio wrote:
> was hoping that someone would talk about how to measure the electronic
> part of the mic, without contributions from the membrane.
I posted two methods earlier in the thread. Drive the DUT from a
generator with a high value resistor in series, making it a constant
current source. Measure the voltage across the DUT (the mic) and use
Ohm"s Law with that known value of current. This provides the magnitude
of the impedance. If the measurement is done with synchronized generator
and receiver, as with TEF or FFT, it yields complex impedance, that is,
R + jX. For 1% precision, the series resistor must be 100x the impedance
of the DUT.
This is LONG established practice. We were doing this with TDS (TEF) for
loudspeakers in the early '80s.
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