Re: [time-nuts] Measuring 10 MHz accurately: correction

To all, regarding measurement a 10 MHz signal to parts in E-12. Here is one way which I believe I had sent a while ago: You will need the following test equipment: Traceable 10 MHz Frequency Standard (GPS disciplined Rubidium, Cesium, etc.) 40 GHz Synthesized Signal Generator 40 GHz Frequency Cou

[time-nuts] 10E-12

> > What is the difference between 1E-12, 10E-12, and 10^-12? > > E means raised to the power of ten. E means "times ten raised to the power" (as, indeed, it says in the wikipedia reference below) which is not the same thing as "raised to the power of ten". > x E y is shorthand for X * 10^y. >

[time-nuts] Measuring GPSDOs

Moin, I'm currently thinking about building my own GPSDO, mostly for the fun of it an because i need a way to waste money ;-) But, as an engineer, building alone doesn't satisfy me, i also want to know how good it performs. But there lies the problem. How do you measure a frequency normal that is

[time-nuts] Plotting csv files

Hi All, I have an ongoing problem and realized why don't I ask the time nuts!! My frequency and temperature data is usually plotted in a comma separator value (csv) file. I use excel to import and plot the results. Excel only lets me plot 32000 points at a time. I often have over a million sa

[time-nuts] Measuring 10 MHz

Hello, Thanks to all for your replies and suggesting especially Brooke, Bruce and Pete. I am already using the Stanford technique with the 1 kHz output. That's how I get 2 x 10E-12/sec accuracy. Using this technique, the accuracy should be 7.9 uHz at 10 MHz (7.9E-13). But I don't reliably ac

[time-nuts] Latest firmware for Symmetricom 58503B?

G'Day, I have had a look around the Symmetricom web site and cannot find what is the latest firmware for the 58503B reference receivers. My hardware reports versions 3925-D & 3925-A. Is 3925 the latest firmware and if not does anyone have a pointer to the latest? Thanks & regards _

Re: [time-nuts] Plotting csv files

On Thu, 8 May 2008 09:53:34 +0100 "Martyn Smith" <[EMAIL PROTECTED]> wrote: > Does anyone has some nice software that will easily plot a csv file. I do > need to be able to change the vertical scale rather than have it autorange. > > It doesn't have to be free, but it has to be easy to use. I'v

Re: [time-nuts] Plotting csv files

Martyn, With that many data points you might like to try 'Igor' DaveB, NZ - Original Message - From: "Martyn Smith" <[EMAIL PROTECTED]> To: Sent: Thursday, May 08, 2008 8:53 PM Subject: [time-nuts] Plotting csv files > Hi All, > > I have an ongoing problem and realized why don't I

Re: [time-nuts] Plotting csv files

> Does anyone has some nice software that will easily plot a csv file. I do > need to be able to change the vertical scale rather than have it autorange. http://ploticus.sourceforge.net/doc/welcome.html -- http://www.wearablesmartsensors.com/ http://www.softwaresafety.net/ h

Re: [time-nuts] Plotting csv files

Martyn, I have written a VB program to do that. There are plots on my web site. Send me the first few hundred lines of your data with some explanations about what the fields are and I'll see what I can do with it. Didier > -Original Message- > From: [EMAIL PROTECTED] > [mailto:[EMAIL

[time-nuts] Efratom FRS-C Manual.

Many thanks to those of you who directed me to suitable download sites. Now all I have to do is fix it ! . Cheers, Lin Scott. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts a

Re: [time-nuts] HP/Agilent 5065A Rubidium Vapour frequency standard problem

Thanks Bill for your input. The second harmonic is at 32 which as I understand is a good reading. The Photo I however is only 18. The original reading was 24 and then 20 some time later - so it seems to have been low anyway. I cannot change the error reading with either the course or fine cont

Re: [time-nuts] Measuring 10 MHz

Hi Martyn: An important aspect is to properly set the trigger levels for each input. A mistake I made early on was to ass-u-me that the 1 PPS trigger level should be half of 5 Volts, i.e. 2.5 volts, but that's very wrong. The best approach is to install a BNC-T connector at the front panel and

Re: [time-nuts] 5065A problem

Jim, Connect a scope to TP2 an the bottom of the A7 module at .5V/cm. With the unit in open loop and the meter selection in error swing the fine and/or coarse oscillator adjust back and forth. You should see the error meter cross back and forth thru zero when the oscillator goes thru the resona

Re: [time-nuts] HP/Agilent 5065A Rubidium Vapour frequency standard problem

You didn't really say in your description but you really need to have the loop open using the front panel switch before you try to adjust the oscillator. Unless you are very familiar with how tiny of a turn it takes to make it too far off to lock, you will have it out of range very quickly. Open th

Re: [time-nuts] Measuring 10 MHz

> Hello, > > Thanks to all for your replies and suggesting especially Brooke, Bruce and > Pete. > > I am already using the Stanford technique with the 1 kHz output. That's how > I get 2 x 10E-12/sec accuracy. Martyn, Just to make sure -- when you do this with your SR620 (i.e., 1000 externall

Re: [time-nuts] HP/Agilent 5065A Rubidium Vapour frequency standardproblem

Jim, Found the book and looked at your symptoms. A) The frequency output is drifting near the crystal rate, so the control loop is open. By "loop" I mean the path from the OXCO A10 to the synthesizer A1 and multiplier A3 to the RVFR to the photo amplifier A7 to the phase detector A8 to the integ

[time-nuts] Conexant GPS board

I know that many of the readers of this group are quite familiar with OEM GPS boards, generally used to build GPSDOs or something similar. I happen to have a Conexant GPS board, Part # TU30-D160-031 and I am in search of the relative datasheet. I find on Internet many references to similar boar

Re: [time-nuts] Conexant GPS board

Alberto di Bene wrote: > I know that many of the readers of this group are quite familiar with OEM GPS > boards, generally used to build GPSDOs or > something similar. I happen to have a Conexant GPS board, Part # > TU30-D160-031 and I am in search of the relative > datasheet. I find on Interne

Re: [time-nuts] Conexant GPS board correction

Alberto di Bene wrote: > I know that many of the readers of this group are quite familiar with OEM GPS > boards, generally used to build GPSDOs or > something similar. I happen to have a Conexant GPS board, Part # > TU30-D160-031 and I am in search of the relative > datasheet. I find on Interne

Re: [time-nuts] Conexant GPS board correction #2

Bruce Griffiths wrote: > Alberto di Bene wrote: > >> I know that many of the readers of this group are quite familiar with OEM >> GPS boards, generally used to build GPSDOs or >> something similar. I happen to have a Conexant GPS board, Part # >> TU30-D160-031 and I am in search of the relati

Re: [time-nuts] Plotting csv files

Martyn, you may consider this: http://www.ulrich-bangert.de/plotter.zip Best regards Ulrich Bangert > -Ursprungliche Nachricht- > Von: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Im Auftrag von Martyn Smith > Gesendet: Donnerstag, 8. Mai 2008 10:54 > An: time-nuts@febo.com > Betreff: