[Boatanchors] Microphone

[Richard Knoppow]

----- Original Message ----- 
From: "Brian Clarke" <brianclarke01 at optusnet.com.au>
To: "Richard Knoppow" <1oldlens1 at ix.netcom.com>; 
<dhallam at knology.net>
Cc: <Boatanchors at mailman.qth.net>
Sent: Saturday, February 09, 2013 5:53 PM
Subject: Re: [Boatanchors] Microphone


Unless you know how much current passes between the leads 
when measuring resistance, it is quite unwise to attempt to 
measure microphone element continuity. Some potential 
problems include:
  a.. burning out the voice coil
  b.. burning the voice coil causing rubbing on the magnet
  c.. distorting the voice coil cone
  d.. blowing the cone out of the magnet.
Use a CRO while gently tapping the microphone case - do not 
blow into the microphone.

73 de Brian, VK2GCE.

    While this is a good precaution to take all of these are 
extremely unlikely. A normal VOM or medium range ohms range 
on an electronic voltmeter has far too low a voltage to 
cause any of these to happen. I do agree about tapping and 
not blowing into microphones although the only mics likely 
to be damaged by blowing into them are ribbon types.  Most 
microphones are a lot more rugged than you would think.


--
Richard Knoppow
Los Angeles
WB6KBL
dickburk at ix.netcom.com