Re: [time-nuts] SRS SR620 External Source Issue -- Help Request -- A thought

Didier Juges wrote: > Dr Bruce Griffiths wrote: > >> [EMAIL PROTECTED] wrote: >> >> ...if my model is correct the apparent offset in the mean will be increased by a factor of 10 over that for a a 1 second gate time. Bruce >>> L

Re: [time-nuts] SRS SR620 External Source Issue -- Help Request

>I have an SR620 counter that I set up with a Z3801A as an external reference. >If I put a bnc T connector at the output >of the Z3801A and use two equal length bnc cables, one to the ext. ref input >on the back and the other to channel A >then do a frequency measurement, I get a mean that is

Re: [time-nuts] Article: Regulations focusing on backdating have prompted corporations to pursue technical solutions centered around time synchronization to eradicate the practice

Dr Bruce Griffiths wrote: > Jared Morrisen wrote: > And just how does this prevent someone altering the files's timestamp? >> Not sure what your point is. >> >> /jared >> > Jared > > Just ensuring that the computer clock is accurate, doesn't prevent > anyone

Re: [time-nuts] SRS SR620 External Source Issue -- Help Request -- A thought

Dr Bruce Griffiths wrote: > [EMAIL PROTECTED] wrote: > >>> ...if my model is correct the apparent offset in the >>> mean will be increased by a factor of 10 over that for a a 1 second gate >>> time. >>> >>> Bruce >>> >>> >> Looks like you're right Bruce. I did both 1, 0.1 and 0.01 g

Re: [time-nuts] SRS SR620 External Source Issue -- Help Request

I ran into this same problem with my first SR620. I thought it was defective, so I sent it to SRS for a cal and refurbishment. It got better, but still had an offset of 0.0004 Hz. Later I bought a second one, and it, too, had an offset similar to yours. A careful reading of the manual, page

Re: [time-nuts] Article: Regulations focusing on backdating have prompted corporations to pursue technical solutions centered around time synchronization to eradicate the practice

Jared Morrisen wrote: >>> And just how does this prevent someone altering the files's timestamp? >>> > > Not sure what your point is. > > /jared Jared Just ensuring that the computer clock is accurate, doesn't prevent anyone from tampering with the file timestamps as well as the documenta

Re: [time-nuts] SRS SR620 External Source Issue -- Help Request -- A thought

[EMAIL PROTECTED] wrote: >> ...if my model is correct the apparent offset in the >> mean will be increased by a factor of 10 over that for a a 1 second gate >> time. >> >> Bruce >> > > > Looks like you're right Bruce. I did both 1, 0.1 and 0.01 gate times and > the error increased by a facto

Re: [time-nuts] Article: Regulations focusing on backdating have prompted corporations to pursue technical solutions centered around time synchronization to eradicate the practice

>>And just how does this prevent someone altering the files's timestamp? Not sure what your point is. /jared On 2/21/07, Dr Bruce Griffiths <[EMAIL PROTECTED]> wrote: > > Jared Morrisen wrote: > > Interesting piece... > > > > *Weak Enforcement of Corporate Governance and Lax Technical Controls

Re: [time-nuts] Trying LinuxPPS - can't get 'git'

You shouldn't have to be root, but I tried it as root with the same results. >I'm not familiar with 'git' so I may be way off base here, but are you >root? > >Bob LtCol Keith E. Brandt, MD, MPH USAF-NASA Aerospace Medicine Liaison Officer Johnson Space Ce

Re: [time-nuts] SRS SR620 External Source Issue -- Help Request -- A thought

>...if my model is correct the apparent offset in the > mean will be increased by a factor of 10 over that for a a 1 second gate > time. > > Bruce Looks like you're right Bruce. I did both 1, 0.1 and 0.01 gate times and the error increased by a factor of 10. And it doesn't sound like this is

Re: [time-nuts] Trying LinuxPPS - can't get 'git'

I'm not familiar with 'git' so I may be way off base here, but are you root? Bob On 2/21/07, Keith E. Brandt, M.D. <[EMAIL PROTECTED]> wrote: > > I've run into problems on setting up linuxpps and need help. > > I've got a 900 mHz PIII Dell set up with Debian 3.1r4 and updated the > kernel to 2.6

Re: [time-nuts] SRS SR620 External Source Issue -- Help Request -- A thought

[EMAIL PROTECTED] wrote: > Here's a thought. Perhaps there is a problem with the rear reference input; > A and B channels are fine since they read the same error. The question is > "Is there a way of adjusting the Reference Input so that it correctly read > the 10Mhz input?" > > I tried the sa

Re: [time-nuts] SRS SR620 External Source Issue -- Help Request -- A thought

Here's a thought. Perhaps there is a problem with the rear reference input; A and B channels are fine since they read the same error. The question is "Is there a way of adjusting the Reference Input so that it correctly read the 10Mhz input?" I tried the same setup with my other counter and i

Re: [time-nuts] SRS SR620 External Source Issue -- Help Request

Hi Magnus: Do you have a patent number? Have Fun, Brooke Clarke w/Java http://www.PRC68.com w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml http://www.precisionclock.com Magnus Danielson wrote: > >But then there is the patent. :) > >... > >Cheers, >Magnus > > > ___

Re: [time-nuts] SRS SR620 External Source Issue -- Help Request

Hej Magnus The Frequency measurement logic (before the interpolators) appears to use a pair of 2 bit synchonisers, one for the rising edge and one for the falling edge of the internally generated frequency gate. The synchronisers synchronise the respective transitions of the frequency gate sig

[time-nuts] Trying LinuxPPS - can't get 'git'

I've run into problems on setting up linuxpps and need help. I've got a 900 mHz PIII Dell set up with Debian 3.1r4 and updated the kernel to 2.6.20. I then went to look for the patches for the Linuxpps and that's where I'm stuck. It requires cloning the repository using git. I installed git, bu

Re: [time-nuts] Article: Regulations focusing on backdating have prompted corporations to pursue technical solutions centered around time synchronization to eradicate the practice

Dr Bruce Griffiths wrote: > Jared Morrisen wrote: >> Interesting piece... >> >> *Weak Enforcement of Corporate Governance and Lax Technical Controls Have >> Enabled the Illegal Backdating of Stock Options* >> >> *Conclusion* >> The backdating fiasco demonstrates that the need for synchronized time

Re: [time-nuts] SRS SR620 External Source Issue -- Help Request

From: Dr Bruce Griffiths <[EMAIL PROTECTED]> Subject: Re: [time-nuts] SRS SR620 External Source Issue -- Help Request Date: Thu, 22 Feb 2007 12:40:57 +1300 Message-ID: <[EMAIL PROTECTED]> Hej Bruce, > http://thinksrs.com/downloads/PDFs/Manuals/SR620m.pdf Many thanks! > Has everything except cir

Re: [time-nuts] SRS SR620 External Source Issue -- Help Request

> > Your SR620 is well within its specifications, the tolerance for this > test is -0.0035 Hz to + 0.0035 Hz. The readings fluctuate by that amount, but the mean is still off by -0.00150 Hz. > Changing cable length... Tried it, no difference. > 25Ohm load with two terms Tried all variations

Re: [time-nuts] SRS SR620 External Source Issue -- Help Request

Mike Fahmie wrote: > At 02:57 PM 2/21/2007, you wrote: > >> I have an SR620 counter that I set up with a Z3801A as an external >> reference. If I put a bnc T connector at the output of the Z3801A and use >> two equal length bnc cables, one to the ext. ref input on the back and the >> other t

Re: [time-nuts] SRS SR620 External Source Issue -- Help Request

At 03:50 PM 2/21/2007, you wrote: >At 02:57 PM 2/21/2007, you wrote: > >I have an SR620 counter that I set up with a Z3801A as an external > >reference. If I put a bnc T connector at the output of the Z3801A and use > >two equal length bnc cables, one to the ext. ref input on the back and the > >o

Re: [time-nuts] SRS SR620 External Source Issue -- Help Request

At 02:57 PM 2/21/2007, you wrote: >I have an SR620 counter that I set up with a Z3801A as an external >reference. If I put a bnc T connector at the output of the Z3801A and use >two equal length bnc cables, one to the ext. ref input on the back and the >other to channel A then do a frequency me

Re: [time-nuts] SRS SR620 External Source Issue -- Help Request

[EMAIL PROTECTED] wrote: > I've done the self calibration. Nothing changes. I've let everything > warm-up and checked both channels A and B, same thing. I've swapped the > cables on the front and the back, same thing. I've tried a T-connector on > the ref input with 50ohm termination, same th

Re: [time-nuts] SRS SR620 External Source Issue -- Help Request

Magnus Danielson wrote: > I don't have the manuals (and particular the service manual) for the > SR620, >> does anybody have them in electronics form? >> >> Cheers, >> Magnus >> >> ___ >> time-nuts mailing list >> time-nuts@febo.com >> https://www.febo.c

Re: [time-nuts] SRS SR620 External Source Issue -- Help Request

From: <[EMAIL PROTECTED]> Subject: Re: [time-nuts] SRS SR620 External Source Issue -- Help Request Date: Wed, 21 Feb 2007 18:13:08 -0500 Message-ID: <[EMAIL PROTECTED]> > I've done the self calibration. Nothing changes. I've let everything > warm-up and checked both channels A and B, same thing.

Re: [time-nuts] SRS SR620 External Source Issue -- Help Request

I've done the self calibration. Nothing changes. I've let everything warm-up and checked both channels A and B, same thing. I've swapped the cables on the front and the back, same thing. I've tried a T-connector on the ref input with 50ohm termination, same thing. The readings are pretty sta

Re: [time-nuts] SRS SR620 External Source Issue -- Help Request

From: <[EMAIL PROTECTED]> Subject: [time-nuts] SRS SR620 External Source Issue -- Help Request Date: Wed, 21 Feb 2007 17:57:22 -0500 Message-ID: <[EMAIL PROTECTED]> > I have an SR620 counter that I set up with a Z3801A as an external reference. > If I put a bnc T connector at the output of the Z

Re: [time-nuts] SRS SR620 External Source Issue -- Help Request

Hi Flavio: Have you tried using averaging? The right most digits are from an interpolator and if you check the manual the displayed resolution is much greater than the accuracy, but if you average say 1,000 readings then those digits get much better. Also have you done the self calibration?

Re: [time-nuts] Article: Regulations focusing on backdating have prompted corporations to pursue technical solutions centered around time synchronization to eradicate the practice

Jared Morrisen wrote: > Interesting piece... > > *Weak Enforcement of Corporate Governance and Lax Technical Controls Have > Enabled the Illegal Backdating of Stock Options* > > *Conclusion* > The backdating fiasco demonstrates that the need for synchronized time is a > crucial business and technol

[time-nuts] SRS SR620 External Source Issue -- Help Request

I have an SR620 counter that I set up with a Z3801A as an external reference. If I put a bnc T connector at the output of the Z3801A and use two equal length bnc cables, one to the ext. ref input on the back and the other to channel A then do a frequency measurement, I get a mean that is about

[time-nuts] Article: Regulations focusing on backdating have prompted corporations to pursue technical solutions centered around time synchronization to eradicate the practice

Interesting piece... *Weak Enforcement of Corporate Governance and Lax Technical Controls Have Enabled the Illegal Backdating of Stock Options* Feb 21, 2007 URL: http://www.wallstreetandtech.com/showArticle.jhtml?articleID=197007836

Re: [time-nuts] Austron 1201A

Rob, Thanks for looking, i'll keep searching.. It wil just take some time. Stijn Nestra Rob Kimberley schreef: > Stijn, > > Sorry to disappoint you, but have checked, and no 1201A. I'm sure there must > be one lurking around amongst other members of the group. A number of > Austron 1201A results

Re: [time-nuts] Austron 1201A

Stijn, Sorry to disappoint you, but have checked, and no 1201A. I'm sure there must be one lurking around amongst other members of the group. A number of Austron 1201A results are coming up on Google so might be worth following up on these. Good luck Rob Kimberley -Original Message- Fr

Re: [time-nuts] GPS splitter

Hi, They should work depending on the exact type. Check to make sure that the ports are not a DC short to ground. You can use a DC blocking capacitor on one port, but you might need a DC current path so you don't get an antenna fault on the Rx. 330R to ground on the RX side of the cap should do it,

Re: [time-nuts] Austron 1201A

Hi Stijn, I have a number of Austron manuals in store, and will take a look tonight when I get back from work. Regards Rob Kimberley -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of S. Nestra Sent: 20 February 2007 23:44 To: time-nuts@febo.com Subject:

Re: [time-nuts] yet more RFTG thoughts

Robert E. Martinson" wrote: > ...having intermittent "NO GPS" LEDs on, on both units. I ran into this also. I bought my XO units later in game from the ebay vendor that most everyone else bought from. One unit had a the wrong card, a 6 channel card inside of a 8 channel box. When I hooked tha