One way to get around problems with things like GPSDO’s is to have multiple
standards and use them for different ranges of Tau. OCXO’s have good ADEV
close in. Picking up a few and comparing them is pretty cheap. Rb’s have
better
ADEV at longer tau ( 300 sec). Comparing three or four is not
For Frequency, Phase, Time and Distance I use:
(delta frequency/frequency)=
(delta phase/phase)=
-(delta time/time)=
-(delta distance/distance)
This is shown on page 20.16 of Electronic Instrument Handbook, second
edition
by Clyde F. Coombs.
It is a good reference to have available.
I
Hi
I’m a little concerned about the measurement setup here. Based on the quoted
text, there have been a few messages in the thread that have not showed up
here.
=
The “start” input on the counter is defined below. The “stop” input is not
defined. Is the counter running in time
time-nuts members:
What are some signal generators for ATE test?
Requirements:
100MHz to =10GHz (higher would be better)
Settling time less than 1mS
Reasonable phase noise
Cost, less than mortgaging a house.:)
Just a single tone that can be moved reasonably fast.
IQ modulation not
snip
If you only have your TIM file with you back home, all you have to do is
to press (e) to Edit the trace, as I recall it. I might have edited the
file directly also. When doing that, I helped another time-nut at one time.
Uncheck the Use Input Frequency and then input 10 MHz (or
Stephane wrote:
I need to make a squarer. I was hesitating between several methods
: using a CMOS gate, but this will increase the flicker noise from
what I've read, using an amplifier and clamping diodes or a fast
comparator which might create some noise around the trigger
point... Any
Hello,
First, please do apologize for the confusion answering in the bad email. That's
things I'm absolutely able to do when replying at 3 am ! Again, sorry for that
and thanks Magnus for having corrected this.
Back to my setup :
There is indeed nothing on the STOP input of the HP5370a. The
Hi
Ok, I didn’t think I’d seen the plots before.
I agree that the plots look like “counter limited” data. That’s a fine
explanation at the shorter Tau’s. I also agree that some sort of periodic
“stuff” is getting into one of the signals and creating the ripple. What I’m
wondering about (and
to
http://www.qsl.net/b/bi7lnq//freqcntv4/test/20150118/ . I don't know
how to interprete this kind of chart. :(
Li Ang,
Nice data. Thanks for sharing.
In a self test like this, try using a phase plot ('p') or TDEV plot ('t'). As
you see, the X72 ADEV or MDEV plot is sort of boring, showing mostly
Some history about the Greenwich time signal
At one time, some of the most accurate clocks in the world snuggled in the
folds of Surrey beauty spot Leith Hill. Why, because some of the most
accurate compasses in the world were already there. Just before World War
Two, a duplicate of the
Hi Bob,
On 01/18/2015 04:25 AM, Bob Camp wrote:
Hi
I’m a little concerned about the measurement setup here. Based on the quoted
text, there have been a few messages in the thread that have not showed up here.
The messages got accidentally posted in the wrong thread.
=
The “start”
Bob,
On 01/18/2015 02:44 PM, Bob Camp wrote:
Hi
Ok, I didn’t think I’d seen the plots before.
I agree that the plots look like “counter limited” data. That’s a fine
explanation at the shorter Tau’s. I also agree that some sort of periodic
“stuff” is getting into one of the signals and
Hi
Effectively you only have one signal into the counter. It’s simply measuring
the 1/tau measurement floor of the 5370. If your objective is to measure the
ADEV of the measurement floor of the counter, that’s fine. Your plot looks a
lot like the one half way down on:
Bonjour Stéphane,
On 01/18/2015 03:37 PM, Stéphane Rey wrote:
Hello,
First, please do apologize for the confusion answering in the bad email. That's
things I'm absolutely able to do when replying at 3 am ! Again, sorry for that
and thanks Magnus for having corrected this.
Ah well, that's
The MAX5318 is available at Digikey. Not cheap, and not sure if it is
electrically compatible, but it has good specs (not an audio DAC).
And it is in a TSOP package, so can be soldered on a small adapter board
Didier KO4BB
On Fri, Jan 16, 2015 at 1:49 PM, Jerry Pixton jpix...@shentel.net wrote:
On 1/17/15 6:59 PM, Ivan.Cousins wrote:
time-nuts members:
What are some signal generators for ATE test?
Requirements:
100MHz to =10GHz (higher would be better)
Settling time less than 1mS
Reasonable phase noise
Cost, less than mortgaging a house.:)
1ms settling time is fairly fast.
The Agilent 8340 series might be useful here - little weak in the phase noise
area but they offer frequency and power sweeps. And you did say economy was a
key requirement
Content by Scott
Typos by Siri
On Jan 17, 2015, at 9:59 PM, Ivan.Cousins ijcous...@frontier.com wrote:
time-nuts
Tom,
On 01/18/2015 02:44 PM, Tom Van Baak wrote:
Li Ang,
Nice data. Thanks for sharing.
In a self test like this, try using a phase plot ('p') or TDEV plot ('t'). As
you see, the X72 ADEV or MDEV plot is sort of boring, showing mostly a -1 slope to
forever.
In the phase (and frequency)
Thanks a lot Bob and Magnus for your very helpful comments.
The HP5370a was indeed in TI mode. By the way what is the difference with
+/-TI, the button just aside...
But I guess I understand where I've missed something : I've tried to put the Rb
on channel A and the DUT on channel B but result
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