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Joined: Apr 2009
Posts: 450
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Member
Joined: Apr 2009
Posts: 450 |
Is there a simple tester to test paging horns, and amps ?
Thanks Gary S.
Gary Stevens
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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 |
standard 77 toner will drive an amp, or a single speaker. Try it out on an operational amp, and on an individual speaker that is not connected to anything so you know what to expect.
There is also a meter for testing the power requirement for a run of line operated speakers, and of course I've forgotten what it's called, but they cost $200 and up. Quite useful for finding the 8 ohm speaker that 'Joe' the maintenance guy hooked into the system! Suddenly that run requires WWWAAAYYY too much power!
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: Sep 2005
Posts: 9,289 Likes: 15
Admin
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Admin
Joined: Sep 2005
Posts: 9,289 Likes: 15 |
Impedance Meter = Rather then the DC resistance they use a 1K tone to read the impedance which will give you the wattage requirement for the speaker load.
The quick test for an 25/70v amp is apply tone to input and voltmeter on output. At full power you should have 25/70 volt out. When a load that does not exceed amp wattage is connected the output should stay close to unloaded voltage. A incandescent light bulb makes a good load just use ohms law to figure the wattage.
Example a 120v/150w bulb is about a 50 watt load @ 70v
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Joined: Dec 2002
Posts: 9,429 Likes: 3
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Joined: Dec 2002
Posts: 9,429 Likes: 3 |
Jeff Moss
Moss Communications
Computer Repair-Networking-Cabling
MBSWWYPBX, JGAE
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Joined: Jan 2010
Posts: 223 Likes: 1
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Joined: Jan 2010
Posts: 223 Likes: 1 |
Can't live without it...https://toaelectronics.com/zm-104a.asp
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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 |
"but they cost $200 and up."
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Yeah, yeah. I know. My excuse is the last one I bought was 20 years ago! Last places I worked wanted to keep the billing up, at least that's the way it seemed. Finding a bad/wrong type speaker can take 2-5 times as long without that impedance meter!
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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