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Blog Amphenol / SV Microwave SF2921-61506-1S SMA coaxial connector: behavior under vibration
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  • Author Author: Jan Cumps
  • Date Created: 4 Mar 2023 5:41 PM Date Created
  • Views 2054 views
  • Likes 9 likes
  • Comments 10 comments
  • svmicrowave
  • amphenol
  • SF2921-61506
  • SF2921-61506-1S
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Amphenol / SV Microwave SF2921-61506-1S SMA coaxial connector: behavior under vibration

Jan Cumps
Jan Cumps
4 Mar 2023
Amphenol /  SV Microwave SF2921-61506-1S SMA coaxial connector: behavior under vibration

In this post I test the Amphenol / SV Microwave SF2921-61506-1S SMA coaxial connector's DC resistance behavior when vibrating. How well does the spring contact stays connected to the PCB?

image

I want to check if, under vibration, the middle contact keeps in touch with the copper pad it's pushing against. I've mounted a connector on shabaz 's test PCB, and soldered test leads  to signal and ground. I then made a shortcut in the adapter using aluminium foil and kept that locked in place by mounting some devices on it. I used a sub 1-GHz antenna (photo in the mail header) and a little SMA gender-converter. Both tests are interesting because they have a different mass, and they behave differently at resonance frequencies. In both cases, I measured approximately 155 mΩ at rest. Fiddling with the setup doesn't change that.

I mounted the PCB on a the shaker from the Vibration Measurement with the MCC 172 roadtest.

image

I vibrated the setup between 20 and 150 Hz.  

image

The vibrations are visible on the resistance graph, +- 0.5 mΩ. That is nothing, and very likely interference picked up in the measurement setup. If I switch my meter to mV, it shows the vibrations too.

image

For short periods, I drove the shaker to its maximum, and the connection never interrupted. In this vibration test, I could not break the contact. The connector survived all conditions. I also did a thump test: hit the PCB on a ceramic plate. That didn't break the contact either.

Blog Index

  • Overview: Amphenol / SV Microwave SF2921-61506-1S SMA coaxial connector series
  • Amphenol / SV Microwave SF2921-61506-1S SMA coaxial connector: behavior under vibration
  • Create a custom footprint in KiCad 7 - 1: collect info and component details
  • Create a custom footprint in KiCad 7 - 2a: create the footprint for an SMA coax connector with the editor - initial outline
  • Create a custom footprint in KiCad 7 - 2b: create the footprint for an SMA coax connector with the editor - copper pour, solder mask clearance, holes, pads
  • Use a LibraryLoader Footprint in KiCad 7
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  • Jan Cumps
    Jan Cumps over 2 years ago in reply to Jan Cumps

    Keithley DMM6500 showing both graphs

    image

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  • Jan Cumps
    Jan Cumps over 2 years ago in reply to Jan Cumps

    (collateral: the temperature ramp)

    image

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  • Jan Cumps
    Jan Cumps over 2 years ago in reply to Jan Cumps

    ... and a ramp up / ramp down:

    image

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  • Jan Cumps
    Jan Cumps over 2 years ago in reply to javagoza

    Result:

    image

    data (openoffice format):

    defbuffer1_0306_203554.zip

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  • Jan Cumps
    Jan Cumps over 2 years ago in reply to javagoza

    I actualy don't need a LabVIEW flow.

    I've set up the meter for use with the card. 

    • channel 2 for temperature, with room temp as cold junction ref
    • channel 5 and 10 for 4-wire resistance
    • configured to scan infinitely, every 5 seconds

    I'm now letting it run. I've put it on a (medium temp) heater, starting from approx. room temperature. Currently it ramped to 67°.

    Here's a photo of a measurement in grid view. I'll share the graphs when finished.

    image

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