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'[EE]: HALT testing a Hantronics LCD (results)'
2000\12\11@122111 by Eisermann, Phil [Ridg/CO]

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I would like to offer my experience in HALT testing a Hantronix LCD to the
list. A long while ago (perhaps as long as a year ago), I asked the members
of this list about things to watch out for in putting an LCD display in a
hand-held power tool. Many things have happened since then, the project was
abandoned, then restarted. I still do not know if it will go into production
(it is on hold again). But I was given the opportunity to take the
electronics portion of the tool to a  test lab near Detroit, and would like
to share the information I have gained so far.

I won't go into too much detail here, just the general findings. But I am
willing to send more details (test setup, equipment, etc) to anyone who is
interested. I need about a week to finalize the report. The LCD in question
was a HDM08216H-1-DOA, extended temperature.

Ok, so without further ado, the Hantronix display is virtually
indestructible. It was tested with a QualMark HALT chamber. We took the
display from -100C to +100C (that's like -147F to 212F for those not used to
the metric system). Although it did not work at those temperatures, it
always reverted to normal operation when temperatures were in the specified
operating range.

The display was cycled from -40C to +80C (operational limits of the
electronics) in 1.5 minutes with a 10min dwell time at each end. No damage
or degradation over 5 cycles.

The display was step-vibrated up to 30g @ 2Khz before it stopped responding.

The electronics were then temperature cycled at -50C to +80C, combined with
vibration. The LCD failed at 30g @ 2KHz. First, garbage was displayed on the
LCD. Next, the wires that were soldered into the LCD broke. Then the
soldered wires were replaced with a connector. An unrelated failure at 35g
ended the test, at which point our lab time was up. It should be noted that
at 35g, capacitors started flying off the main board...

The display always recovered after the stress was removed or reduced. I will
be using Hantronix if the project moves forward. I hope this information is
of use to others on the list.

---
Phil Eisermann
spam_OUTpeisermaTakeThisOuTspamridgid.com

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2000\12\11@155540 by Lawrence Lile

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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?

-- Lawrence Lile

{Original Message removed}

2000\12\11@165715 by Eisermann, Phil [Ridg/CO]

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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 removed}

2000\12\11@170515 by Dan Larson

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On Mon, 11 Dec 2000 16:48:23 -0500, Eisermann, Phil [Ridg/CO] wrote:

>(as anyone from Texas can attest), and very cold ( -40F is not unreasonable
>in Minnesota).

Hey!  -40F is unreasonable *anywhere*. Besides, it only gets that cold WAY up north
in Minnesota (such as Ely or International Falls), which is close enough that you might
as well consider it Canada anyway for weather purposes <VBG>.

Dan, a non-Democrat (yes there are some of us here...), native Minnesotan.

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2000\12\12@214656 by miked

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> 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?
>
> -- Lawrence Lile

I think Dremel has a rotary tool out now with an LCD display.

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