Hi Alf,

I'm not familiar with that particular model (HP3478A). We used to have
a complete set of microfiche for all the HP product line, back to the
HP200 oscillators, but unfortunately someone else coveted it and we
don't have it any longer. Sorry I can't be more specific help. You
should be able to find a manual somewhere--there are places that
specialize in used manuals. Or you may find it online--if not now, it
may show up before too long (I just don't know how accessible it will
be...)

Cheers,
Tom