[time-nuts] HP-59309A Clock counts only seconds
Jeremy Nichols
jn6wfo at gmail.com
Sun Apr 16 03:42:02 UTC 2017
Update: The 4011s arrived in good condition. The sockets arrived today
(I ordered a whole bunch with various numbers of machined pins as Tom
Miller recommended). All the sockets were of the "good" kind except for
the 14-pin sockets, which were the cheap kind in accord with Murphy's
Law. :-(
Pause while I get the right kind of 14-pin socket.
Jeremy
On 4/4/2017 11:52 AM, Jeremy Nichols wrote:
> Thanks, everyone, for your inputs. I've ordered some NOS 4011s (made
> by National Semi, mildly ironic since I used to work there) and some
> supposedly round pin sockets (the reviews were mixed—some folks got
> good stuff, some got junk).
>
> I'll update the thread once I have everything here and installed.
>
> Jeremy
>
>
> On Mon, Apr 3, 2017 at 11:01 PM Tom Miller <tmiller11147 at verizon.net
> <mailto:tmiller11147 at verizon.net>> wrote:
>
> Also, you might install a high quality machined pin socket. Save the
> non-replaceable PC board.
>
> ----- Original Message -----
> From: "David C. Partridge" <david.partridge at perdrix.co.uk
> <mailto:david.partridge at perdrix.co.uk>>
> To: "'Discussion of precise time and frequency measurement'"
> <time-nuts at febo.com <mailto:time-nuts at febo.com>>
> Sent: Monday, April 03, 2017 9:33 PM
> Subject: Re: [time-nuts] HP-59309A Clock counts only seconds
>
>
> > You can get a brand new CD4011BE from pretty much most suppliers
> at about
> > 15 cents that won't exhibit the problems of the earlier ones.
> >
> > Dave
> >
> > -----Original Message-----
> > From: time-nuts [mailto:time-nuts-bounces at febo.com
> <mailto:time-nuts-bounces at febo.com>] On Behalf Of Jeremy
> > Nichols
> > Sent: 04 April 2017 00:44
> > To: time-nuts at febo.com <mailto:time-nuts at febo.com>
> > Subject: [time-nuts] HP-59309A Clock counts only seconds
> >
> > I have a new-to-me HP-59309A HP-IB Digital Clock. The clock
> works on both
> > the internal crystal oscillator and on an external 10 MHz standard
> > (GPSDO). However, it counts only to 60 seconds and then repeats
> without
> > updating the minutes digit. The TIME SET (FAST and SLOW)
> push-buttons work
> > but again, the count will not update minutes and hours, only
> seconds. The
> > DAY SET procedure works correctly for days and months. All the other
> > switches and buttons do what they are supposed to do. Using my
> 10526T
> > logic pulser I can force the minutes and hours counters to work.
> > The power supply is in good condition (after replacement of a few
> > components) and I see no other problems (yet).
> >
> > Tracing the clock signal through the logic circuitry brought me
> to U3 on
> > the A4 board. This (U3) is a 4011 quad 2-input NAND gate in a
> 14-pin DIP
> > package. It "connects" the seconds counter to the minutes
> counter and
> > appears to have failed. One of the people on the email list
> > <hp_agilent_equipment at yahoogroups.com
> <mailto:hp_agilent_equipment at yahoogroups.com>> commented that the
> 4000 series CMOS
> > chips have a known limited lifetime. Since these parts are no
> longer in
> > production, the writer expressed the concern that any parts I
> might find
> > to buy may be DOA.
> >
> > Before I go hunting for parts, I'd appreciate hearing from
> anyone in the
> > group who has experience with the 59309A Clock and/or the
> 4000-series CMOS
> > family. In particular, are there modern equivalents to my 4011
> chip? If
> > the 4000's really do have a limited lifetime I'd rather use a
> substitute.
> >
> > Jeremy, N6WFO
> >
> >
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