[time-nuts] PRS-45A is alive!
dave.martindale at gmail.com
Tue Dec 9 08:29:40 EST 2014
One zero-effort way to do this: a portable GFCI.
I have several GFCIs (Ground Fault Circuit Interrupters) designed for
portable use. They may be in the form of an extension cord with the GFI
electronics in the male plug, or a short cord with the electronics in the
middle of the length, or a small block that plugs into an outlet, with a
female outlet that a device plugs into. All of these portable GFCIs
require line power to remain in the "on" position. If the AC is
interrupted briefly, the GFCI drops out and stays off until manually reset.
This must be by design, because it is different from the behaviour of GFCI
outlets, and GFCI circuit breakers. It mimics the behaviour of latching
magnetic contactors (relays) used on large AC-powered tools. I use the
portable GFCIs to get the same shut-off-and-stay-off feature for small shop
tools that are equipped only with an ordinary switch. A portable GFCI
should work just as well for electronics that you want to stay off until
On Tue, Dec 9, 2014 at 1:24 AM, wb6bnq <wb6bnq at cox.net> wrote:
> Hi Bob,
> I think using a latching relay is a very good idea and prudent. Besides
> while it is reacquiring lock you would probably be busy resetting VCR's and
> so forth.
> Bob Stewart wrote:
> Hi Pete,
>> I don't have any way of knowing. I've asked the seller if he has a copy
>> of the control software, and I don't like to go back with a bunch of petty
>> questions like that. The next issue is adapting some serial port software
>> i wrote to the protocol in the manual Magnus sent to see if I can pull the
>> status codes out. That would probably tell me something.
>> I have some tests I want to run immediately on my GPSDO and the KS to
>> settle the question of which one can't keep time. After that, I'll power
>> it down, lift its skirts and take some pics. It's pretty simple on the
>> surface: a Cs Beam Tube, a main board, a microwave package with MTI 5Mhz
>> OCXO, and the HV and LV power supplies.
>> I don't intend to keep this thing running 24/7, but I have a question:
>> Here in Houston, we have the occasional large thunderstorm and resulting
>> short power outages. So, should I put a latching relay in the power stream
>> to keep it off if I lose power? The budget is now officially busted, and a
>> UPS is not going to happen for awhile. Santa's sleigh is now officially
>> out of gas.
>> From: Pete Lancashire <pete at petelancashire.com>
>> To: Bob Stewart <bob at evoria.net>; Discussion of precise time and
>> frequency measurement <time-nuts at febo.com> Sent: Monday, December 8,
>> 2014 11:46 PM
>> Subject: Re: [time-nuts] PRS-45A is alive!
>> Love to have known how long it was off, and how much of that 16
>> minutes was getting the tube degassed.
>> On Mon, Dec 8, 2014 at 7:11 PM, Bob Stewart <bob at evoria.net> wrote:
>>> Well, it's alive, and I even have 10MHz coming from it. It took about
>>> 16 minutes to go to lock. Is that good, or doesn't matter? Now I've got
>>> to put together a serial cable and see if I can talk to it and find out how
>>> it thinks it's doing. But, this is good!
>>> Hope you enjoy the wall decorations. =)
>>> Bob - AE6RV
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