[Test-Equipment] HP equip questions

[gil smith]

Hi Gary:

At 02:34 PM 1/14/02 -0500, you wrote:
>I have never seen any official explanation of how HP used
>suffix letters.
>
>In many cases they used A, B, C, etc for newer versions of
>the same instrument.  Sometimes the step was rather large as
>when the 410 multimeter went from the 410B, which was the
>large old style vacuum tube version to the compact 410C 
>which still used a vacuum tube.  Later 410's went to solid state,
>but were still referred to as 410C.

My 8443A Tracking-Gen/Counter is a later-model unit that uses a 7-segment
display instead of nixies -- seems like that kind of change should have
become a C version (the B version has no counter I think), but it stayed an
A.  I was kinda bummed when I saw the 7-seg display, since I love nixies,
but the unit looks brand new, so I guess I can't complain.


>The 5245M may have come out later than the 5245L, but it also
>has different specs (high stability time base) and was in the
>catalogs at the same time.
>
>In an earlier message I noted that the 5245L could have the
>10544 high stability time base.  I think this is as good as the 5245M,
>but I don't know anyway to tell that you have it except to open the
>cover and look.

I have a 5245L, Specification H96 -- anyone know what the H96 means?  I
just popped the top to look at the timebase, which must be the cylindrical
can behind the plugin area.  It is marked "5243A-69A Crystal Oven."  Is
this the standard timebase?

gil


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