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Shorting rotary switch only shorting in one direction
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rqsall:
Hello all,

I bought these switches: https://www.aliexpress.com/item/2pc-High-quality-RS26-3-Pole-Position-4-Selectable-Band-Rotary-Channel-Selector-Switch-Single-Deck/32822295045.html according to the datasheet at the bottom of the page, they are shorting. It doesn't matter much for my application, but I figure I'd test it anyway. So I set my Fluke 8010A to ohms range, connected the common to the pole connected to position 1, 2, 3 and 4. Connected the other multimeter terminal to position 1 and 2 and slowly turned the switch to see if the resistance would rise when switching. Well, when switching from position 1 to 2, it does, but switching from position 2 to 1, the resistance stays 0.


* Has anyone seen this before?
* Am I even doing this correctly? What would be a better way to test?
mikerj:
Just connect the meter between any two adjacent poles (1-2, 2-3, 3-4).  There's no need to connect to the common terminal.
rqsall:

--- Quote from: mikerj on June 22, 2018, 11:39:30 am ---Just connect the meter between any two adjacent poles (1-2, 2-3, 3-4).  There's no need to connect to the common terminal.

--- End quote ---

Then the meter reports open circuit in either position. I assume you mean position rather than pole? With common terminal I meant the common terminal of the meter.
JS:

--- Quote from: rqsall on June 22, 2018, 12:25:27 pm ---
--- Quote from: mikerj on June 22, 2018, 11:39:30 am ---Just connect the meter between any two adjacent poles (1-2, 2-3, 3-4).  There's no need to connect to the common terminal.

--- End quote ---

Then the meter reports open circuit in either position. I assume you mean position rather than pole? With common terminal I meant the common terminal of the meter.

--- End quote ---
While the meter is connected as described it should only close shortly as you switch positions, not once sitting on any position. This is what's called make before brake close the next connection before opening the last one used to reduce switching noise in some configurations or acoid having open circuit on the wiper, as opposed to break before make which opens the last contact before closing the next one, used to prevent shorting between different terminal positions, like selecting different low impedance drivers to a single receiver. This last one is the default, more usual ones.

JS

rqsall:

--- Quote from: JS on June 22, 2018, 06:51:55 pm ---While the meter is connected as described it should only close shortly as you switch positions, not once sitting on any position. This is what's called make before brake close the next connection before opening the last one used to reduce switching noise in some configurations or acoid having open circuit on the wiper, as opposed to break before make which opens the last contact before closing the next one, used to prevent shorting between different terminal positions, like selecting different low impedance drivers to a single receiver. This last one is the default, more usual ones.

JS

--- End quote ---

With the switch in position 1 and the ohm meter connected with its common terminal to the appropriate pole (the one that is switched by postion 1, 2, 3 and 4) on the switch and the other ohm meter terminal on position 1 connection, there should be 0 ohms right?

Now if position 2 is connected to position 1, then I should not see open circuit at any time when I slowly move the switch from position 1 to position 2. However, I do see open circuit for a short moment, but I don't see this same open circuit when I then move the switch slowly back to position 1 from position 2. In that case, there's continuity the entire time.
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