Also, you might install a high quality machined pin socket. Save the
non-replaceable PC board.
----- Original Message -----
From: "David C. Partridge" <david.partri...@perdrix.co.uk>
To: "'Discussion of precise time and frequency measurement'"
<time-nuts@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-boun...@febo.com] On Behalf Of Jeremy
Nichols
Sent: 04 April 2017 00:44
To: time-nuts@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_equipm...@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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