Hi One would guess that they delay going “full power” so as not to hammer the main power supply quite so hard at start up.
Bob > On Jan 29, 2022, at 2:27 PM, Tom Holmes <thol...@woh.rr.com> wrote: > > HI Ed & Ed... > > Thanks for the plot. The dive towards zero just before the spike s > surprising; maybe a funky data point? > > Anyway, I'm not doubting that the observations are correct, just curious > about the timing and source of that power spike. Like maybe the controller > decided it wasn't heating fast enough? > > Tom Holmes, N8ZM > > -----Original Message----- > From: Ed Palmer <ed_pal...@sasktel.net> > Sent: Saturday, January 29, 2022 11:07 AM > To: time-nuts@lists.febo.com > Subject: [time-nuts] Re: HP Z3801A project update > > On 2022-01-29 2:30 AM, "Tom Holmes" <thol...@woh.rr.com> wrote: >> Ed... >> >> Very good data! >> >> I am curious about one part of the warmup process. At around 7 minutes, the >> power jumps up radically, which you attribute to >> the outer oven kicking in. It has often been stated on this list that the >> outer oven was intended for use during really cold >> starts, which I would expect should cause it to kick on almost immediately >> during a very cold start. I am assuming your start >> was from room temperature. For a room temp start, I wouldn't expect it to >> kick on at all if it's purpose was as reported. Or >> do I have the oven functions reversed? >> >> Tom Holmes, N8ZM > > I can confirm Ed's tests. Attached is a similar test that I did on my > Z3801A. If it matters, mine is the 24V nominal version. My test was > done at 27V. The power supply was an HP6622A with GPIB. I wrote a > program to query the current being drawn each second. The current value > was later converted to power. > > Ed > > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an > email to time-nuts-le...@lists.febo.com > To unsubscribe, go to and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-le...@lists.febo.com To unsubscribe, go to and follow the instructions there.