www.yerdurumu.org/makaleler/documents/instrument.pdf<=
/DIV>
On page 38 is Figure 2.17 which ~ matches the physical vertical I =
have.=20
The
manual I have calls it the "series 201", which they call the=20
"S-5007-v".
The model designation ~ difference may only be just subtle =
subsequent
model changes over the years from the ~ 1950's through the =
1960's
but it seems like no one has a complete collection of manuals =
to
compare the minor/major differences.
The manual I have is mostly the old spirit duplicator (fading =
purple)
text which is quite difficult to read now. I'll try to see if =
I can=20
copy the
pages in time with my printer/scanner. The text has a set up=20
procedure
but it doesn't have a "trouble indications and resolutions", which =
can=20
still leave one with no recourse but to simply try what may think could=20
work. Hang loose...
Till then....with this problematic guessing mass balance =
game;
it could be a single or a number of corrections that could be tried =
:
You might be trying to attain too great a period and/or, it's =
subject=20
to
too much temperature variation affecting the spring. The best =
period
I used in the past was 15s; periods greater than that would =
also
have the mass wander up or down....probably from the varying
temperatures in it's environment on the spring with =
contraction
or expansion of the metal. The instrument is notorious for=20
needing
a constant temperature casing/s insulation/s. I had mine in a =
insulated
vault and with the steel covering also covered in insulation; but =
it=20
would
still wander and need adjustment measured in days, or a week or =
two
at best. Try raising the base rear two adjustment screws up =
for a=20
shorter
period and see if that helps elongate the time from what it now =
is;
along with ~ heavy insulation. The original sales "pitch",=20
mentions
30> seconds, but it's been proven to be a nuisance; unless one=20
likes
to adjust ~ every day or ever so number of (?) hours of the =
day. =20
As
long as the mass varies daily about the center indicator say, 3/8" =
varying=20
up and or down, that's OK, you'll still get a useful seismic =
signal. =20
I'm not
absolutely sure, but even a 1 degree temperature change will
affect some the spring/balance at a 15s mass period, and get =
much
worse (larger displacement) with a longer period.
Not all models of the vertical have a sliding counter weight=20
attachment.
One could just use small lead or coin counterweights on the boom, =
for=20
minor
finger moving balance weight adjustment without using the ~ (very) =
touchy=20
base screws adjustments. Some model/s used a motor driven=20
counterweight
with a photocell for remote adjustments.
It doesn't "sound" like you need to adjust the wire from the =
spring
to the top mechanical adjustments anymore.
I don't know what you have underneath the instrument for it =
too
set on (?), if it's not a reasonably solid and thick ~ stable=20
concrete
pier, even slight movement will frequently upset the balance =
often
from environmental influences.
You have a very good (but old fashioned) ~ long period =
vertical
instrument...it's worth resolving the balance problem/s.
We'll ~ work it out...
Take care, Meredith
On Fri, Feb 24, 2012 at 2:45 PM, JAMES C ALLEN
<jcallen1@...........> wrote:
Meredith Lamb, Bob or others that may have knowledge =
of=20
Spregnether 5000 Vertical Seis:
It has been my understanding that =
in=20
setting up this machine it was imperative to have the unit mass =
indicator=20
balanced between the upper and lower stop, which thus far for me has =
been=20
illusive . The mass indicator either slowly goes to the bottom =
or the=20
top. I have adjusted the spring wire and still I can not get it =
to=20
remain balanced between the stops. Does anyone have a copy of =
the manual=20
who could provide a photocopy or email the setup instructions included =
or=20
provide any tips or suggestions.
James=20
Allen