[time-nuts] Fine print on HP 5334B
hmurray at megapathdsl.net
Thu Feb 22 15:10:20 EST 2007
(Interesting timing given the SR620 discussion.)
I'm (finally) getting my GPIB gizmo working.
I have a HP 5334B running off its (good) internal osc looking at the output
of a Z3801A. Assuming the Z3801A is stable, this is a backwards way of
looking at the internal osc. (There is a shared in/out connector for the
internal clock, so I can't see the internal osc if I feed it an ext
I left it running for a night with the mostly default setup and 100 cycle
averaging. I think the default gate time is 0.3 seconds. Answers ranged
I've had this setup running for several weeks. The bottom digit doesn't fit
on the display, so I never noticed there was anything interesting going on
down there. The 100 cycle averaging has a button on the front panel.
Without it, the display is one digit shorter.
Yesterday, I got it running with a single 60 second gate. Now it's wobbling
I was a bit surprised there is such a difference. Is this all obvious to
anybody who has carefully read the manual?
Of course, now that I think about it, averaging frequency measurements seems
less helpful that simply using a longer measurement time. But I'm still
surprised the answers were so different.
Another quirk I noticed. They truncate rather than round for the display on
the front panel. 9.999999339 shows up as 9.99999933 rather than 9.99999934
Is there anything else like this I should watch out for? Does anybody have a
quick summary on how to get good results or traps to avoid?
These are my opinions, not necessarily my employer's. I hate spam.
More information about the time-nuts