Re: REQ: major electronics analysis project help needed TIA

JB2 <none@xxxxxxxx> wrote:
>mroberds@xxxxxxxxxxxxxxxx wrote:
>> Do you need analog measurements for everything, or is
>> digital OK for some of the inputs?
>[...] All the sources are analog, but how those samples are
>obtained, I don't think will make a difference. I thought simple
>inductive pickups that feed analog to dig conv for recording.

I wasn't completely clear. What I meant was, do all your inputs need to
be of the form "bus B is at exactly 27.3 volts" (analog) or can some of
them be of the form "bus B is on" or "bus B is off" (digital). It sounds
like all or nearly all of your inputs will be analog.

>>How accurate does each analog reading need to be?
>Big question! I would want at most _+2%. I suspect any more
>deviation may make modeling too inaccurate.

To a zeroth approximation, this helps define your system architecture.
If you require high precision, it might make sense to buy one or a few
really good A to D converter(s), and then use it (them) to make several
dozen measurements in turn. If your requirements are not so strict (and
yours seem to not be very strict), it might make sense to buy lots of
cheaper A to D converters and let each one do a handful of measurements.

>I have a crew on board, flight crew, trechnicians, engineers (me) 707
>A/C

Since you mentioned elsewhere it's DoD, maybe you could just throw
people at it. Buy 150 $20 digital multimeters, open up a couple of
fresh cans of soldiers/sailors/airmen/marines, put them on the aircraft,
and tell them "at the sound of the tone, write down the readings on the
five meters that have been assigned to you". After you land, have each
one key his/her readings into a computer for you, then buy him/her a
beer. Ebay most of the meters at $10. Total cost $1500 + beer. OK,
the aircraft might not seat 30 extra personnel and/or it might affect
the flight manuevers you want to do.

Matt Roberds

.

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