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Joined: Dec 2005
Posts: 7,056
RIP Moderator-Mitel, Panasonic
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RIP Moderator-Mitel, Panasonic
Joined: Dec 2005
Posts: 7,056 |
Does anybody have an opinion/recommendation for impedance meters for line operated paging systems. Nothing quite like trying to T/S paging systems without one! John C. (Not Garand)
When I was young, I was Liberal. As I aged and wised up, I became Conservative. Now that I'm old, I have settled on Curmudgeon.
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Joined: Dec 2005
Posts: 2,928
Member
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Member
Joined: Dec 2005
Posts: 2,928 |
I Swear I did not touch anything 
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Joined: Dec 2002
Posts: 9,428 Likes: 1
Member
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Member
Joined: Dec 2002
Posts: 9,428 Likes: 1 |
I'm told that these are very good https://www.gold-line.com/zm1.htm
Jeff Moss
Moss Communications
Computer Repair-Networking-Cabling
MBSWWYPBX, JGAE
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Joined: May 2007
Posts: 5,058 Likes: 5
Moderator-1A2, Cabling
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Moderator-1A2, Cabling
Joined: May 2007
Posts: 5,058 Likes: 5 |
I used the Gold Line zm1p out at JFK airport. Put in 4-500 zones and ...maybe 5,000 speakers. Worked like a charm. Figures out your wattage and has a built in tone generator. Very nice.
When I started in the industry (PA system on Noah's Ark) we had a Wheatstone Bridge that we used. No comparison. This is much, much better.
Wait, maybe we used the Wheatstone on OSP and something else on PA? In any event the Gold Line is an excellent product.
Sam
"Where are we going and why are we in this hand basket?"
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Joined: Dec 2005
Posts: 7,056
RIP Moderator-Mitel, Panasonic
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RIP Moderator-Mitel, Panasonic
Joined: Dec 2005
Posts: 7,056 |
Man, what a difference 20 years makes! They were a LOT cheaper in the '80s. Then again, a dollar bought a lot more! And was a lot harder to get!! John C. (Not Garand)
When I was young, I was Liberal. As I aged and wised up, I became Conservative. Now that I'm old, I have settled on Curmudgeon.
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Joined: Jul 2006
Posts: 2,742 Likes: 16
Admin
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Admin
Joined: Jul 2006
Posts: 2,742 Likes: 16 |
Mine is still one of them there analog devices with a null meter and a couple of dials. You have to remember not to put it on live circuits and I think it only goes up to 100 or 150 Amps.
I use it about once a year.
I think I paid about $150 bux for it in 1990's money. A TOA ZM-104 isn't much more than that today.
Carl
This model is end of life
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Joined: Feb 2005
Posts: 12,347 Likes: 4
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Joined: Feb 2005
Posts: 12,347 Likes: 4 |
Wait, maybe we used the Wheatstone on OSP and something else on PA?
Yup. Wheatstone will very accurately measure resistance not impedance. Before the TDR it was used to help locate cable faults.
-Hal
CALIFORNIA PROPOSITION 65 WARNING: Some comments made by me are known to the State of California to cause irreversible brain damage and serious mental disorders leading to confinement.
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