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Message-ID: <00be01c6aa79$1cf7bb80$0300a8c0@lark>
From: "Alan Melia" <alan.melia@btinternet.com>
To: <rsgb_lf_group@blacksheep.org>
References: <009f01c6aa0e$aedf1f40$6501a8c0@eagles> <001201c6aa42$e08f77e0$0300a8c0@lark> <001701c6aa75$07a3aae0$6501a8c0@eagles>
Date: Tue, 18 Jul 2006 15:47:33 +0100
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Subject: LF: Re: RF Ammeter;  DFCW
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Hi J, A thermal meter should read very low ohms on a DMM, my 3Amp ones are
about 0.1ohm. They usually go open circuit and not repairable. It is a pity
they are useful beasts but a short  flash-over will often take them out.

In that case you would have had vitrually no antenna current !!  Unless by
some strange effect one leg of the thermocouple has gone open and left the
sensing wire intact. Thermo meters will respond to DC, though their
calibration may not be exact. These beasts are difficult to find these days,
I remember they were very common about 40 years ago. I also have a 25amp
thermo meter here, but it doesnt say RF, so I guess it was for supply
frequency rms measurements.

Cheers de Alan G3NYK


----- Original Message -----
From: J. Allen <vy1ja@northwestel.net>
To: <rsgb_lf_group@blacksheep.org>
Sent: 18 July 2006 15:18
Subject: LF: RF Ammeter; DFCW


> Alan,
>
> The dead meter was a thermal meter and it was in a separate metal case.  I
> will remove it and check it out.