From: Cullen, Douglas A. 
To: psnlist psnlist@..............
Subject: Help with new seismograph


We were gifted a Slinky seismograph and we are in the process of getting it=
 setup.  I do have a couple of questions
=20

In Amaseis, can you clear the helicorder data?
We have a regular data glitch at 30 sec interval.  Any ideas about where to=
 start to correct=20

=20
https://picasaweb.google.com/108340045633729097305/May152012
=20
 Hi Doug,=20
=20
    Sorry, but your picasaweb reference comes back as 'not found'. I sugges=
t that you check it, please ?
    To delete a drumplot of recent data, you look for the last data file an=
d delete that.
=20
    The Boise slinky setup file shows a system which is seriously underdamp=
ed. I suggest that you use=20
several FIBRE / FIBREGLASS (old circuitboard?) washers between the damping =
magnet and the mild=20
steel clamp nuts. OR, CAN YOU BUY BRASS NUTS ? This could significantly inc=
rease both the=20
damping and the voltage output. Use a copper tube. Try offsetting this so t=
hat one side is closer to the=20
magnet ? Also use fibre washers for securing the sensor magnets, particular=
ly if you are using steel nuts.
    I will be writing to Boise. It looks as if there are several desirable =
improvements to this instrument,=20
including electronically extending the period to 15 seconds to pick up the =
Rayleigh Surface waves. Even=20
if the accuracy is a bit iffy, being able to see the Rayleigh waves on the =
drumplot makes picking out
earthquakes VERY much easier. =20
    The most immediate improvement would be getting the damping roughly cor=
rect.=20

    There is commonly a glitch in Amaseis when changing from one hour line =
to another if the digital=20
filters  are used, but certainly not at 30 second intervals. Can you connec=
t up the system, but run it=20
without any power on it ? And see if you still get glitches ? Switch a long=
 wave radio on, tune it in=20
between stations and listen for clicks etc at 30 second intervals ?
=20
    Hope that this helps

    Chris Chapman
=20
=20







=
From: Cullen, Douglas A. <DACullen@........>

To: psnlist psnlist@..............
m

Subject: Help with new seismograph









We were gifted a Slinky seismograph and we are in the process of getti=
ng it setup.  I do have a couple of questions


 


In Amaseis, can you clear the helicorder data?
We have a regular data glitch at 30 sec interval.  Any ideas about=
 where to start to correct 

 


https://picasaweb.google.com/10=
8340045633729097305/May152012


 


 Hi Doug, 


 


    Sorry, but your picasaweb refere=
nce comes back as 'not found'. I suggest that you check it, please ?=



    To delete a drumplot of recent d=
ata, you look for the last data file and delete t=
hat.


 


    The Boise slinky setup file=
 shows a system which is seriously underdamped. I suggest that you use 



several FIBRE / FIBREGLASS (old circuitboard?) wash=
ers between the damping magnet and the mild 



steel clamp nuts. OR, CAN YOU BUY BRASS NUTS ? This could significant=
ly increase both the 



damping and the voltage o=
utput. Use a copper tube. Try offsetting this so =
that one side is closer to the 


magnet ? Also use fibre washers for securing the se=
nsor magnets, particularly if you are using steel nuts.


    I will =
be writing to Boise. It looks as if there are several desirable improvement=
s to this instrument,&nb=
sp;


including electronically extending the period to 1=
5 seconds to pick up the Rayleigh Surface waves. Even 


if the accuracy is a bit iffy, being able to see the Rayleigh waves on=
 the drumplot makes picking out


earthquakes VERY much easier.  



    The mos=
t immediate improvement would be getting the damping roughly corr=
ect. 


 


    There is commonly a glitch in Am=
aseis when changing from one hour line to another if the digital 


filters  are used, but certainly not at 30 second intervals. Can you connect up the system, but run it 



without any power on it ?=
 And see if you still get glitches ? Switch a long wave radio on, tune it i=
n 


between stations and listen for clicks etc at 30 second intervals ?



 


    Hope th=
at this helps


 


    Chris Chapman