Subject: RE: NTT Sync Error
Date: Wed, 21 Oct 1998 08:55:00 -0500
From: "Rood, Omar" <Omar.Rood@mts.com>
To: 'Rod Larson' <rod.larson@mts.com>

Rod,
  Thanks for the Great News.  Brad told me yesterday that the change
seemed to be working for 1 day, now after so many more hours, I think we
can breath much more easy.
  About compensating for the mass.  Yes, I think we would want to do
same, if successful, then it is a feature we could offer in the future.
The problem would be what criteria will be used for acceptance to
measure success.   I am a bit confused about your comment, table g's NOT
real g's to static, the accelerometers always measure absolute
acceleration.  Not true for the LVDT's of course.  Perhaps you are
referring to the DOF acceleration which includes an LVDT based
component?
  When discussing price with MTS-J, they always come back for a last
minute 10% price cut so be sure to inflate price by said amount.
Regards  Omar

> -----Original Message-----
> From: Rod Larson [SMTP:rod.larson@mts.com]
> Sent: Wednesday, October 21, 1998 6:20 AM
> To:   omar.rood@mts.com
> Subject:      NTT Sync Error
>
> Omar,
> Success, we've had NO errors for over 38 hours of continous operation.
> By
> tomorrow morning it will be 48.  I think the s/w change to the
> downlink s/w
> made all of the difference.  I am going to leave brad's hardware in
> the
> machine cuz it will take almost a day to swap it again and I do not
> want to
> do anything that might damage more cards.  It is not a good idea to
> move
> the one interlock cable off of the VME backplane.  Too much of a
> chance to
> mess something up.  Going to test STEX tomorrow & then we're done.
> The Dr.
> is quite happy.  Their tests have been very successful w/ excellent
> shock
> spectra matches (best NTT has ever done.)  He did ask if there is
> something
> we can do about his lousy reaction mass cuz he matches only table g's
> NOT
> real g's to static, i.e. he wants to know if we can do something about
> compensating for reaction mass.  I see no problem to putting
> accelerometers
> on the mass and subtracting these accelerations from the table
> accelerations to feed to STEX.  I did not promise a single thing or
> indicate even that I knew what to do.  This may be an opportunity if
> we
> wish to pursue it.  I will be going to the MTS-J office on Friday to
> help
> Fuku print out some THD data that I took at NTT on Tuesday.  The data
> is
> for some quotation for new seismic system at an energy company (not
> EPDC).
> Let me know if we would like to pursue something about the reaction
> mass
> compensation for $$$.  I know it can be done, cuz I did it at CERL in
> 1975.
>  It's not like compensating for a specimen because the reaction mass
> is
> much more well behaved.
>
> Damn, f**king NCR hung up on me again.  I really am getting tired w/
> bad
> performance from our own network.
> Rod Larson
>
