Hi John,
I'm running TimeLab with a Quartzlock A7 which multiplies frequency /
phase differences in a similar way, and a HP 5370B counter. With the A7
running in TI mode, the multiplying factor is 1E-4 and works as
expected. I measured only stable sources that don't wrap phase within a
few hours, but it would be nice to know how to handle phase wraps properly.
In this case, both, the reference and input frequency are normalized to
1 Hz, so the actual input frequency makes no difference.
Adrian
John Miles schrieb:
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-boun...@febo.com [mailto:time-nuts-
boun...@febo.com] On Behalf Of Timeok
Sent: Wednesday, December 12, 2012 5:15 AM
To: time-nuts@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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