[time-nuts] DMTI and Timelab setup

[John Miles]

Hi, Luciano --

The sampling interval would be whatever rate the counter is returning
readings, as usual.  I usually let the acquisition driver estimate the rate,
unless I know it's exactly one reading per second.

In frequency mode, the scale factor should be 1E-6.   You need the program
to treat the frequency readings as microhertz, to force the 1000000:1
heterodyne factor to be accounted for when the frequency readings are
integrated back to phase differences.   

For TI readings the scale factor should also be 1E-6, and you would enter
5E6 as the input frequency.  I *think* that'll make it handle phase wraps
properly, but you might send me a few plots to make sure.  I've never tried
a DMTD with TimeLab before.  

-- john 

> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-
> bounces at febo.com] On Behalf Of Timeok
> Sent: Wednesday, December 12, 2012 5:15 AM
> To: time-nuts at febo.com
> Subject: [time-nuts] DMTI and Timelab setup
> 
> Hi all,
> 
> if I will use a dual mixer TI meter, suppose to have :
> 
> LO 5.000.005 Hz
> Ref and Ftest 5 MHz
> IF= 5Hz
> 
> how do I have to setup Timelab for acquisition?
> 
> Sampling interval = ....
> Input frequency =  ....
> Scale factor =  ....
> 
> Thanks all,
> Luciano
> timeok
> 
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> --
> timeok
> 
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