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Old 02-07-2014, 12:29 AM   #1
kyleservicetech
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Default Servo Connector Duty Cycle Quick Tests

I've got to give full credit to "Rags" in this thread for raising a question on the servo connector life span issue, per below.
http://www.wattflyer.com/forums/showthread.php?t=73138

The question raised is an excellent one that prompted me to run a quick test on just two connector samples. What caught me completely off guard is the quality of one of those connectors purchased in a bag of connector kits at a Local RC flea market, versus the quality of a name brand MAXX products connector.

The attached PDF file shows the results that I came up with.


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File Type: pdf Servo Connector Tests by Kyleservicetech.pdf (613.7 KB, 41 views)

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Old 02-07-2014, 05:11 PM   #2
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Thanks Denny!

I think I need a signature.
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Old 02-07-2014, 06:04 PM   #3
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Great info - thank you.

Your thoughts about the gold plating wearing off or in the case of tinned terminals, ten tinning wearing off and oxidation occurring that would increase resistance?

Originally Posted by kyleservicetech View Post
I've got to give full credit to "Rags" in this thread for raising a question on the servo connector life span issue, per below.
http://www.wattflyer.com/forums/showthread.php?t=73138

The question raised is an excellent one that prompted me to run a quick test on just two connector samples. What caught me completely off guard is the quality of one of those connectors purchased in a bag of connector kits at a Local RC flea market, versus the quality of a name brand MAXX products connector.

The attached PDF file shows the results that I came up with.
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Old 02-07-2014, 07:25 PM   #4
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Originally Posted by rags View Post
Great info - thank you.

Your thoughts about the gold plating wearing off or in the case of tinned terminals, ten tinning wearing off and oxidation occurring that would increase resistance?
Where is the attachment?
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Old 02-07-2014, 07:48 PM   #5
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Originally Posted by Rodneh View Post
Where is the attachment?
The attachment shows up in the #1 posting of this thread.

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Old 02-07-2014, 07:51 PM   #6
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Originally Posted by rags View Post
Great info - thank you.

Your thoughts about the gold plating wearing off or in the case of tinned terminals, ten tinning wearing off and oxidation occurring that would increase resistance?

Good point.

I just tested the aileron servo connector of that old airplane. Its contact resistance showed up as 0.0041 Ohms, IMHO pretty good after over a decade.

One thing of note, that connector is connected and disconnected repeatedly over the past years, providing a sort of cleaning action. Where that gold plating is important, is when those connectors are buried inside a wing as a servo extension, and perhaps left connected for years.

For those that are interested, the contact resistance was measured by applying exactly one ampere DC through the contact. That one amp was provided by a 18 Volt DC, 3 Amp power supply purchased through www.mpja.com.
http://www.mpja.com/0-18VDC-0-3-A-Va...nfo/9600%20PS/

This power supply can be adjusted from zero to 18 Volts DC, and has current limiting adjustable from zero to three Amps. The voltage drop was measured by my Fluke 87V digital meter, set on the high resolution function of the millivolt DC range. This meter allows measuring DC volts down to 00.01 millivolts. The voltage was measured at the same place on the terminal, that is at the location where the wires are crimped into the terminal.
http://www.amazon.com/Fluke-FLUKE-87.../dp/B0002YFD1K

Moving that voltage measuring test location made a substantial difference in the millivolt level measured.

The exact contact resistance can then be calculated by the formula R=E/I or resistance equals voltage drop divided by amps. We used the same testing technique on contacts rated for 800 Amps at work, with commercial micro-ohmmeters designed for that function. Those micro-ohmmeters can cost as much as a wet turbine model.

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