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rossmickey(at)comcast.net
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 Posted: Wed Jun 10, 2015 8:31 pm Post subject: Switch Confusion |
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Ever since I found out that the 1-2-3 position on a simple 1-3 switch ( or any other switch) varies in their location ( top to bottom or bottom to top as referenced by the key hole), I am trying to determine how the switches I have are configured. I assume that the center pole is the common pole between the other two. I then used my ohmmeter on an unconnected switch to check the resistance between the center and the other two poles. I thought that when the resistance read zero between two pole that this then indicated the two were connect and became an ON position. I then attached the wires and fired up the juice and low and behold the two poles that showed zero resistance actually represented the OFF position as determined by using my voltmeter between the poles and the two poles that read 1.0 on my ohmmeter were actually the ON position.
I am a reasonably intelligent person and this just doesn't make sense to me. Can one of you electric wizards explain how this is so?
Ross
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enginerdy(at)gmail.com
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| Posted: Wed Jun 10, 2015 9:00 pm Post subject: Switch Confusion |
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You can almost always imagine the toggle where the base of the toggle is pointing to the terminals that are connected.
So, if a toggle is in the down position, the upper two terminals are connected together. If it helps, visualize the slider on the inside that you are physically pushing to short those terminals together with the lever action of the switch.
If your multimeter has a continuity beeper function, often it looks something like a cell phone signal icon: o))), that might help alleviate some confusion about what the meter is indicating. Usually you wouldn’t get a pure “0.00” reading, even connecting the two probes together.
| Quote: | On Jun 10, 2015, at 11:29 PM, rossmickey(at)comcast.net (rossmickey(at)comcast.net) wrote:
Ever since I found out that the 1-2-3 position on a simple 1-3 switch ( or any other switch) varies in their location ( top to bottom or bottom to top as referenced by the key hole), I am trying to determine how the switches I have are configured. I assume that the center pole is the common pole between the other two. I then used my ohmmeter on an unconnected switch to check the resistance between the center and the other two poles. I thought that when the resistance read zero between two pole that this then indicated the two were connect and became an ON position. I then attached the wires and fired up the juice and low and behold the two poles that showed zero resistance actually represented the OFF position as determined by using my voltmeter between the poles and the two poles that read 1.0 on my ohmmeter were actually the ON position.
I am a reasonably intelligent person and this just doesn't make sense to me. Can one of you electric wizards explain how this is so?
Ross
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user9253
Joined: 28 Mar 2008
Posts: 1925
Location: Riley TWP Michigan
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| Posted: Thu Jun 11, 2015 4:10 am Post subject: Re: Switch Confusion |
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| Quote: | | as determined by using my voltmeter between the poles |
Your ohmmeter analysis is correct. The voltmeter analysis is flawed. Voltage between two contacts of a switch indicates that the switch is open. A closed switch will have zero volts across its contacts. Use the circuit common point (ground) as the voltmeter reference point and measure again.
Joe
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nuckolls.bob(at)aeroelect
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| Posted: Thu Jun 11, 2015 5:29 am Post subject: Switch Confusion |
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At 11:29 PM 6/10/2015, you wrote:
| Quote: | | Ever since I found out that the 1-2-3 position on a simple 1-3 switch ( or any other switch) varies in their location ( top to bottom or bottom to top as referenced by the key hole), I am trying to determine how the switches I have are configured. I assume that the center pole is the common pole between the other two. I then used my ohmmeter on an unconnected switch to check the resistance between the center and the other two poles. I thought that when the resistance read zero between two pole that this then indicated the two were connect and became an ON position. I then attached the wires and fired up the juice and low and behold the two poles that showed zero resistance actually represented the OFF position as determined by using my voltmeter between the poles and the two poles that read 1.0 on my ohmmeter were actually the ON position. |
Take one apart and see how it works . . .
[img]cid:7.1.0.9.0.20150611081432.020ee990(at)aeroelectric.com.0[/img]
Bob . . .
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