Your document seems to originate from a MIL website, ??

If true it might not be a good idea to even be in
possession of such a device unless "SURVEYED"
is stamped all over the machine.

Just a thought.
regards
geoff

SURVEYED means the machine was released from government control.

Or So I understand.

Otherwise it might be stolen or wrongfully appropriated equipment.

MIL websites are kind of dangerous to deal with
in an age of patriot acts. Which to me is leaning
in favor of the Nazis religion.

I choose to avoid the mil websites until
the world calms down a-bit.

Just a thought.


On 8/2/2013 11:36 AM, chrisatupw@....... wrote:
> From: Jerry Chafee 
> To: PSNLIST 
> Sent: Sat, 27 Jul 2013 19:10
> Subject: Any help or knowledge on Everlert 6000 Vibra-Tech Seismograph
>
> Hello all,
>
> I have an Everlert 6000 Seismograph originally used by Vibra-Tech
> Engineers. This was a portable seismograph unit with a printer in the
> top lid, originally used in the mining industry. It dates from the
> 1990’s.  Using Google, I have seen references to the government using
> it in 1995. It appeared to be a replacement for the Everlert II which
> dated back to the 80’s. A picture and specs are shown at
> http://www.dtic.mil/cgi-bin/GetTRDoc?AD=ADA323466&Location=U2&doc=GetTRDoc.pdf 
>
> pages 138 and 139.
>
> Frequency response is 2 – 250Hz Seismic and Sound
>
> ****Hi Jerry,
>    This would be fine for use with mines, etc, but maybe not so good
> for recording earthqakes, particularly the very distant ones.
> You need a response down to 0.5 Hz to pick up the S and P waves.
> The L & R surface waves would not be detected at all. And you
> definitely don't need a bandwidth of 250 Hz with the large amount of
> data this needs to be recorded.
>    Geophones are usually used in these instruments. The specification
> of 2 Hz suggests that 4.5 Hz geophones were probably used - they
> would be a factor of x5 down in sensitivity at 2 Hz. Open up the unit and
> see what type numbers are printed on them ?
> The sensitivity may be a bit low for detecting earthquakes - mine blasts
> tend to be a lot closer and much more violent.
>
> This unit has a very limited keyboard with an up/down/Last Menu/Enter
> button. There is a special button under a screw on the cover that is
> hidden. It looks like it was meant to only be pushed for some special
> case (it is not a battery disconnect)  It also has An RS-232 port, and
> a special printer port for the included (but optional) printer.
>
> I have the main unit, Geophone, LF Microphone, Microphone stand
> (attaches to unit), printer in printer lid, standard non-printer lid,
> connecting cables, DC power cable, and a couple of EPROMs (they call
> them “Data Modules”). It has an exposed portion that houses the EPROM
> (“Data Module” in a “Zero Insertion Force” socket, and an accompanying
> LED which I would suspect would show access, but it never lights up.
>
> When I put batteries in it and attempt to power it up, I get a reading
> on the LCD display stating “Download Program”. The system does
> nothing else, except displays a “Power Save – Press any button to
> continue” message after a short time.
>
> The DC power /charging cord appears to do nothing. There is a light on
> the cover which I know should light up when DC power is applied, but
> nothing happens.
> ****Check for any fuses ? They may be hidden inside the unit. You will
> probably have to open the unit up and check in sequence for wiring /
> circuit / component failures.
>
> I have attempted to contact the company. They still make high end
> seismograph equipment, and they were nice about it. However they
> stated that they do not keep any data on any older seismographic
> instruments.
> ****Really ? Why not ? Incidentally, I don't believe them. Any
> competent company keeps very detailed records.
>
> I am desperately trying to find any information on this unit such as a
> operator manual (and what would really be nice would be a Service
> manual).
> ****There are several web sites which sell manuals for old equipment.
> I suggest that you also try going to the following address :-
> http://www.geosonicsvibratech.com/vibra-tech-instrumentation/item/111-everlert-iii.html 
>
> At the bottom of the page, there are two computer programs which you
> can download.  I suspect that one of them might be for 'old' equipment.
>   Was there a program on any of the Eprom chips ? You might need to
> reload the program into RAM every time the seismometer is switched
> on ? The bandwidth of 250 Hz suggests that quite a fast processor must
> be used. Do you know what the resolution the ADC has ? 8 bits is really
> not too useful for recording Earthquakes, but might be OK for mine 
> blasts.
> Check the type numbers on the chips ?
> Check the handbook for the current equipment - companies tend to
> 'develop' their software and make it more complicated - NOT re-write the
> whole lot !
>
>     Sorry that I can't be of further help - I have never seen one of 
> these units.
> Good luck with the project anyway !
>
>    Chris Chapman
>
>
>
>
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>


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*************
It is by the Entropy that I set my mind in motion.
Entropy is the seeking of equilibrium.
It is by the Entropy that I set my mind in motion.

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