Re: [time-nuts] DDS, OCXO and ADEV

2015-05-03 Thread Tom Van Baak
> I switch counter to TIME MODE, because ADEV1 utility using times, not > frequency: No. ADEV1 expects phase. Not time, not period, not frequency. > Here is from documentation: > > "Adev1 works on everything from pendulum clocks to hydrogen masers. The > only restrictions are that the data must

Re: [time-nuts] DDS, OCXO and ADEV

2015-05-03 Thread Bob Camp
Hi Either the output data is with the counter set to time mode (and it’s in 100’s of ns) or you have it set to frequency mode and have a very stable system. Bob > On May 2, 2015, at 9:53 PM, d0ct0r wrote: > > > Hello, > > > I would like to create some charts for ADEV for following setup:

Re: [time-nuts] DDS, OCXO and ADEV

2015-05-03 Thread Tom Van Baak
a file (more than 13 points), I'll make a set of plots that you can compare against. /tvb - Original Message - From: "d0ct0r" To: "Discussion of precise time and frequency measurement" Sent: Saturday, May 02, 2015 6:53 PM Subject: [time-nuts] DDS, OCXO a

Re: [time-nuts] DDS, OCXO and ADEV

2015-05-03 Thread d0ct0r
The counter is in TIME MODE. And simple calculation could transform it to frequency as necessary. For example: 1/(350.50824*10^-9) 2852999.97512184021693755330 OR 1/0.00350508240900 2852999.96779619226350692058 Which is pretty close to my DDS VFO freq. value [2853000] I switch cou

[time-nuts] DDS, OCXO and ADEV

2015-05-02 Thread d0ct0r
Hello, I would like to create some charts for ADEV for following setup: HP5386A counter connected to External REF. (OCXO). The input of counter connected to my DDS VFO. The frequency on VFO is 2853000 Hz. Here is what I got from counter via GPIB: S +3.505082408E-7 S +3.505082408E-7 S +3.50