Le 04/02/2025 à 00:06, Chris Caudle via
groups.io a écrit?:
On Wed, Dec 18, 2024 at 08:02 AM, kandoit7 wrote:
In the case of measuring condenser microphone
impedance using voltage drop
Try this method shown in a Jensen Tranformer app-note:
This method is valid for unbalanced loads, but not for all types of
balanced loads..
?
That will work for an active output microphone if you measure
the impedance of pin 2 reference to pin 1, and separately pin 3
referenced to pin 1, and add the results together.
This is true only if the outputs are non-floating, which is the case
of the typical Schoeps arrangement, or impedance-balanced circuits.
Some circuits need to be measured differentially.
For a transformer output microphone you would use pin 3 as
the reference pin for the signal generator, and connect the
measurement resistor to pin 2.
That is correct for a xfmr output, but electronically balanced
circuits may not be suitale for having one of their legs grounded.
That's why I recommended the OP to use a fully floating
measurement system.
?
-- Chris C
