McInturff, Gary wrote:
I have a dictation machine with plastic enclosure. With EN55024 as the
driving standard it calls out 4kV contact discharge. The round tip will fit
inside of the microphone opening and when it is pushed into the opening for
about ½ inch it can discharge to the microphone enough that a discharge arcs
to the microphone body the codex locks up. Not a good thing for criteria B
since it requires the USB device to be plugged in and out to reset the power
and clear the error. The standard says fix it and I know how to do that –
its part or tooling costs – but my question is should I fix it? It just
isn’t rational in my mind to actually use this as a test point it certainly
isn’t going to occur during normal use and I just have trouble spending the
money to protect against someone putting his finger down the opening (yes it
will fit). They have to actively want to do that.
Gary, if zapping the microphone causes a latch up then there are other
problems which need fixing. This is the tip of the iceberg. Suspect ground
bounce.
Fred Townsend
DC to Light.
Performance Criterion B
After the test, the equipment shall continue to operate as intended
without
operator intervention. No dgradation of perfomrance or loss of function is
allowed, after the application of the phenomena below a PERFORMANCE LEVEL
SPECIFIED BY THE MANUFACTURE, when th equipment is used as intended. The
peformance level may be replaced by a permissible loss of performance.
This is a surface problem you have to stick your finger very deeply
into the
opening and since jamming your finger up to the first knuckle into the
micophone opening pretty much prevents you from using the equipment as
intended. Can the manual simply be updated to say don’t stick your finger in
here or you’ll lock up the recording handset?
I’m not trying to avoid a quality product or anything like that I just
don’t want to put money to cure something that isn’t going to happen. Like
I said I know how to fix it and I will fix it if I really need to, it’s a
small tooling fix and/or a couple of components on the microphone lines.
I’ve already tested the fix and it works – just don’t want to do it.
Thoughts?
Gary McInturff
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