On Mon, 29 Jun 2009, Dr. David J. Tulbert wrote:
  I just stumbled upon your email in an old post about
manuals for the HP
 1630. We just picked up a 1630G from eBay and I'd be most appreciative for
 any documentation you could make available. Is there also a software module
 for the device? 
Greetings Dave;
That may have been in response to my post, as I picked up a 1630G also
 from eBay a year or two ago. 
As it turns out Agilent, who picked up HP's lab equipment business some
years ago, has back-scanned copies of their manuals. IF you head on over
to 
agilent.com, select 'Manuals', and then search for '1630' you'll
find
it.
I also have a copy of the Service Manual which I could pass along. I know
I found this online, and probably on 
agilent.com also, but I wasn't able
to find it on my 6-second search a few minutes ago.
 - JP