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
Subscribe to my Youtube Channel: https://www.youtube.com/@w2hx/videos

 

 

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