PRS-10 with 1 PPS IN goes nuts - 40 million degrees!
Has ANYONE have a Rubidium module by Stanford Research, PRS-10, use 1 PPS IN, and have watched it for extensive period using LadyHeather? I have 2 GPS, and they are different models. It does the same thing with either one.
I have, and every time, usually within 24 hours, it send one or more wonky data. LH interprets as super high temperature and displays it. Today, it has been running for about 18 hours and just today, it told me it was 40 million degrees. (did it go super nova?) It does this periodically. Then goes right back to normal operations.
I know when PRS-10 starts up, it sends garbage data, so I have to turn on PRS-10 first, then fire LH. I also know when power is interrupted, it does this as well. I have upgraded the connection method and verified all components are securely attached.
I've at this for more than few weeks and I don't know what else could be wrong. I used two separate PRS-10 and they all behave this way.
Calling technical support at SR, I was told when PPS IN is used to control it via GPS, for example, extra CPU cycle is used. But they have not seen corrupted data. (which could be a lie - but I'm just guessing here)
(Mr.) Taka Kamiya
I'm stuck in a wormhole.... Hello, worms!
In message 1309221062.1589930.1555609586223@mail.yahoo.com, Taka Kamiya via t
ime-nuts writes:
If you poll the PRS-10 too fast, the built-in microcontroller can
get seriously confused about the serial interface.
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
Taka,
What happens to the timing of the PPS output and/or the phase of the 10 MHz
output during these wonky times?
This inquiring mind wants to know, as it is getting pretty close to
ordering a
PRS-10 for its own use.
Dana
On Thu, Apr 18, 2019 at 3:45 PM Taka Kamiya via time-nuts <
time-nuts@lists.febo.com> wrote:
Has ANYONE have a Rubidium module by Stanford Research, PRS-10, use 1 PPS
IN, and have watched it for extensive period using LadyHeather? I have 2
GPS, and they are different models. It does the same thing with either one.
I have, and every time, usually within 24 hours, it send one or more wonky
data. LH interprets as super high temperature and displays it. Today, it
has been running for about 18 hours and just today, it told me it was 40
million degrees. (did it go super nova?) It does this periodically. Then
goes right back to normal operations.
I know when PRS-10 starts up, it sends garbage data, so I have to turn on
PRS-10 first, then fire LH. I also know when power is interrupted, it does
this as well. I have upgraded the connection method and verified all
components are securely attached.
I've at this for more than few weeks and I don't know what else could be
wrong. I used two separate PRS-10 and they all behave this way.
Calling technical support at SR, I was told when PPS IN is used to control
it via GPS, for example, extra CPU cycle is used. But they have not seen
corrupted data. (which could be a lie - but I'm just guessing here)
(Mr.) Taka Kamiya
I'm stuck in a wormhole.... Hello, worms!
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Hi
If you talk to the engineers who design these gizmos, after about 15 minutes of their presentation,
they come up with the point that the 1 pps lock setup isn’t quite what you might think. Yes, in some
cases there are hints about this in the doc’s. In other cases …. not so much.
They design the 1 pps in as a “calibration” input. The idea is that you put it on the bench for an hour
with a pps hooked up. At the end of the hour, the Rb is on frequency. You then store the calibration
value and yank the pps.
I’ve not run into any of them that seem to be designed for 24 hour / 7 day a week sort of pps in.
Bob
On Apr 18, 2019, at 1:46 PM, Taka Kamiya via time-nuts time-nuts@lists.febo.com wrote:
Has ANYONE have a Rubidium module by Stanford Research, PRS-10, use 1 PPS IN, and have watched it for extensive period using LadyHeather? I have 2 GPS, and they are different models. It does the same thing with either one.
I have, and every time, usually within 24 hours, it send one or more wonky data. LH interprets as super high temperature and displays it. Today, it has been running for about 18 hours and just today, it told me it was 40 million degrees. (did it go super nova?) It does this periodically. Then goes right back to normal operations.
I know when PRS-10 starts up, it sends garbage data, so I have to turn on PRS-10 first, then fire LH. I also know when power is interrupted, it does this as well. I have upgraded the connection method and verified all components are securely attached.
I've at this for more than few weeks and I don't know what else could be wrong. I used two separate PRS-10 and they all behave this way.
Calling technical support at SR, I was told when PPS IN is used to control it via GPS, for example, extra CPU cycle is used. But they have not seen corrupted data. (which could be a lie - but I'm just guessing here)
(Mr.) Taka Kamiya
I'm stuck in a wormhole.... Hello, worms!
time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
and follow the instructions there.