Hi Lawrence,

        I don't think I said that you should "watch out" when putting in an
LCD. I think someone else said that. Back then, I was asking what things I
should watch out for. Certainly vibration was one of the things on my mind.

        The reason the test was conducted on the LCD as well as the main PCB
was to determine robustness. Our regular customers are rather brutal, and
they expect the tools to work despite how they handle them. That's sort of
the 'brand image' They throw them in the back of their truck (and I do mean
throw - no packing it in the case and setting it in the truck bed), leave
them in puddles, drop them off high ladders, and occasionally use them as
hammers. In fact, one of the field prototypes was dropped from a 25' ladder.
And the LCD continued to work. In addition, North America can get very hot
(as anyone from Texas can attest), and very cold ( -40F is not unreasonable
in Minnesota). So in order to accomodate the customer expectations, I needed
a robust circuit/LCD. Hence the HALT testing.

        I will add that the LCD is enclosed by a rubber bumper at the end of
the tool, and further shielded by a polycarbonate lens.

-----Original Message-----
From: Lawrence Lile [mailto:llile@toastmaster.com]
Sent: Monday, December 11, 2000 3:55 PM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [EE]: HALT testing a Hantronics LCD (results)


WOW.  I am considering a hantronix dispaly, and if it survived this torture
test, it should do fine.


Uh, why did you say earlier that you should "watch out" when putting a
display in a hand-held power tool?  vibration?


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