Author Topic: HP Agilent E4418B Power Meter keypad flex circuit E4418-20007 needed  (Read 1738 times)

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Offline Ordinaryman1971

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  • Country: us
Hi guys, i need an HP Agilent E4418B Power Meter keypad flex circuit E4418-20007
Mine stopped working.
 

Offline kada

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Re: HP Agilent E4418B Power Meter keypad flex circuit E4418-20007 needed
« Reply #1 on: March 03, 2016, 02:39:52 pm »
Hello,
I also need this one.
My flex keypad stopped working too.
The new part number is E4418-66502 (taken from Keysight site).


 

Offline kada

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  • Posts: 25
Re: HP Agilent E4418B Power Meter keypad flex circuit E4418-20007 needed
« Reply #2 on: March 09, 2016, 02:18:08 pm »
After receiving $183 quote from Keysight for flex keypad I definitely decided to do it myself.

First of all I bought the thinnest push-buttons I was able to find. It is only 0.8mm thin.


I decided to mill 1.5mm PCB on my CNC-engraver and after it to reduce thickness down to 0.7mm by back side milling.
PCB Milling

Results:


I also glued rubber circles taken from old remote controller to rubber keypad pushers for better force transfer to push-buttons.



I was not satisfied with result since after keyboard assembly some push-button was pressed and did not released due to the increased length of rubber keypad pushers and push-buttons thickness.
So I decided to cut pushers of rubber keypad and re-glue the rubber circles.



Now all keys works excellent with little more pressing force comparing to original keyboard.
In addition there is a tactile effect which improved ergonomics of the keyboard.

I also included Altium Designer 15 project of the PCB for those who decide to do it.
 


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