[ntp:questions] Trying to use Dimension 4 time keeper

W. eWatson wolftracks at invalid.com
Mon Sep 9 19:57:01 UTC 2013


On 9/8/2013 12:02 PM, unruh wrote:
> On 2013-09-08, W. eWatson <wolftracks at invalid.com> wrote:
>> On 9/7/2013 9:16 PM, David Taylor wrote:
>>> On 07/09/2013 22:38, W. eWatson wrote:
>>>> I'm told that Dimension 4 is an accurate time keeper.
>>>> <http://www.thinkman.com/dimension4/> I downloaded it and installed it.
>>>> It's freeware, but would appreciate a $10 donation. Oddly it comes w/o
>>>> any description to use it. Am I missing something? I'm running it on my
>>>> XP machine. Nothing is said about an OS.
>>>>
>>>> Out of curiosity I installed it on this Win7 PC. It acts like my XP
>>>> install. That is, it has no useful help, what to do is not obvious.
>>>
>>> There are instructions for installing NTP here:
>>>
>>>     http://www.satsignal.eu/ntp/setup.html
>> That's a daunting install process. See my comments about Meinberg below.
>>
>>>
>>> Why would you want to install NTP rather than Dimension 4, or the
>>> Windows own time service?  See:
>>>
>>>     http://www.satsignal.eu/ntp/setup.html#why
>> My XP machine quickly loses accuracy. BTW, it needs to be pretty
>> accurate, since I have a science application that runs on it 7/24. The
>> XP is on a LAN of three PCs. Two are on Win7 in my den. The XP PC is in
>> a building 120' from where I am now. The XP PC Data from the app is
>> uploaded every day to a distant location, and saved in a DB. 1,000 miles
>> from me here in N. Calif.
>
> If time is important, Windows is probably not the best operating system
> to use.
>
>>
>> I tried Meinberg for quite some time, but it flops fairly often. As I
>
> flops? What are the symptoms? Also, if time is important why not invest
> in a GPS (35 dolalrs or so) with PPS.

It moves many seconds in a short time, say a day or two. How is GPS 
going to help? Does it provide access via a USB port.
>
>> recall, my Meinberg software was not nearly as involved as shown in the
>> link above.  Given the XP is outside, I don't often go out there to
>> check the time against an atomic clock. Consequently the data becomes
>> erroneous.
>
> Since the computer is obviously linked to the net, it is not necessary
> to go out there to check the time. You could do it against one of your
> local machines or whatever via the net.
>
> What time accuracy do you need?
>
0.1 seconds.



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