True, neutral loop is only 0-60mA but then I would think a switch to change the polarity would be useful since you might not know if the loop you’re plugging into is +tip -sleeve or -tip +sleeve? Maybe that is what the big telco switch
on the side is meant for? Reversing the polarity? Dunno.
From: Paul Heller <[email protected]>
Sent: Friday, December 2, 2022 2:38 PM
To: W2HX <[email protected]>
Cc: Greenkeys <[email protected]>
Subject: Re: [GreenKeys] 43A-1 Test Meter?
I would say it depends on the signaling. If polar you would want negative and positive. But if normal (non-polar, I forget the name) the current is either zero or 60ma (or 20 or 30 depending)
Right?
Paul
W2TTY
On Dec 2, 2022, at 8:18 PM, W2HX <[email protected]> wrote:
Anyone ever run across this? I couldn’t find anything on it
https://w2hx.com/x/TTY/43A-1%20Test%20Meter/20221202_141257.jpg
I picked it up thinking it could make a nice meter for tty loops. But I wonder what its original purpose was. I would have thought something TTY related would be +/- 100mA not just 0-100mA
73 Eugene W2HX
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