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From: scott@hpsdde.hp.com (Scott Roleson)
Newsgroups: sci.space.shuttle
Subject: HST Ground Point??
Message-ID: <2764@hp-sdd.hp.com>
Date: 30 Oct 89 17:37:22 GMT
Sender: news@hp-sdd.hp.com
Distribution: usa
Organization: Hewlett-Packard, San Diego Division
Lines: 29


Hello Ron Baalke at JPL,

In your recent posting to sci.space.shuttle "DAILY STATUS/KSC...10-27-89",
you state that "DUE TO A PROBLEM ESTABLISHING THE HST SINGLE POINT GROUND,
BATTERY CHARGING...HAVE BEEN DELAYED".

I found this curious.  My first thought was that something as important
at the ground or zero-potential point would be a major design parameter,
not something that seems to be illusive.  

I'm an EMC (electromagnetic compatibility) engineer with Hewlett-Packard,
and in when I review the design of a new printer or plotter, one of the
first things I look for is that some point on the device has been designated
as the zero potential reference.  There is certainly a lot of difference 
between the HST and one of our plotters, but I would think that the ground
point would be even more important to the HST.

There's probably something here I'm missing.  Could you elaborate?  Thanks!


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Scott Roleson                     |   Internet: scott%hpsdde@sdd.HP.COM
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