[time-nuts] HP 115CR Clock Powerup / Documentation

[Eric Scace]

Hello Hugh & Luciano —

   Luciano: Hugh said his clock was a 115CR, not BR. The CR has the mechanical digital display.

   I have a 115BR that I want to bring back on the air after about 30 years of power-off in my father’s lab. The state of any electrolytic and tantalum capacitors after that much time has me concerned. I would be very happy to hear details of your experience in servicing the -115BR.

   Thank you.

— Eric

> On 2016 Dec 23, at 03:05 , timeok <timeok at timeok.it> wrote:
> 
> 
>   Hi,
>   I have the complete manual of the HP115BR. Pse contact me directly to send you the file.
>   If you need I can suggest some service activity normally are needed by this old clock.
>   Luciano,
>   timeok at timeok.it
> 
> 
>   From "time-nuts" time-nuts-bounces at febo.com
>   To time-nuts at febo.com
>   Cc
>   Date Fri, 23 Dec 2016 10:29:01 +1100
>   Subject [time-nuts] HP 115CR Clock Powerup / Documentation
>   Hi,
> 
>   I've been fortunate enough to acquire a HP 115CR Frequency
>   Divider/Digital Clock - it's electromechanical and I suspect built in
>   the mid/late 60s - just slightly older than your humble correspondent.
> 
>   It's similar though not identical to the 115CR shown here
>   http://www.leapsecond.com/hpclocks/
> 
>   I'd like to fire it up - given it's age my thought was to use a current
>   limited 24V bench supply and slowly ramp up the voltage the first time -
>   would welcome any thoughts on this. I gather from the supporting
>   documentation for the powersupply it's rated at drawing ~250mA
> 
>   I've been unable to locate a scan of the owners manual or service manual
>   online. Have looked at time-nuts archives, leapsecond.com and hparchive
>   to no avail. There does appear to be a hardcopy available for purchase
>   - happy to fall back to this if necessary, but any pointers welcome.
> 
>   My goal ultimately is to have it on display running, synchronised to a
>   GPS disciplied 10MHz source :)
> 
>   Any thoughts and feedback welcome - this is my first foray into old
>   clocks :)
> 
>   Kind Regards,
>   Hugh
>   VK3YYZ/AD5RV
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