Hi Said,
Thank you for the answer and also for the attached measurements. The
measurements I find particularly interesting and note worthy.
It seems that digital signals provide high noise immunity in the sense that
one relies only on one dimension to convey information: the cross-over
point.
I have downloaded and installed Plotter, and found it easy to setup and use, at
least for basic functionality. The menu threw me off a little bit (no simple
File-Open dialog), but I am sure I will get used to it.
I have ran my spare HP10811 overnight (twice), against the HP5370A's own
Didier Juges wrote:
I have downloaded and installed Plotter, and found it easy to setup and use,
at least for basic functionality. The menu threw me off a little bit (no
simple File-Open dialog), but I am sure I will get used to it.
I have ran my spare HP10811 overnight (twice), against the
Dr Bruce Griffiths [EMAIL PROTECTED] wrote:
The apparent behaviour of your 10811's is far too good!!
Over a period of 15,000 seconds the allan deviation should have reached
a minimum and then increased as the effects of ageing manifest themselves.
Either the oscillators are
Stephan Sandenbergh wrote:
Hi Bruce,
Thank you for the elaborate answer covering different logic types. Funny
enough, I have just read the excellent book you recommended cover to cover -
probably the origin of many of my questions.
As I said in reaction to Said's response - I am not
Hi Didier,
the sigma-tau plot looks indeed strange! Can you send me the data file
for some tests with it?
73 de Ulrich, DF6JB
-Ursprüngliche Nachricht-
Von: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Im Auftrag von Didier Juges
Gesendet: Mittwoch, 25. Oktober 2006 15:36
An:
Didier
It would be useful if you describe in some detail your measurement setup.
Which signals are connected to which inputs on the 5370A?
How long are the cables? etc.,
Also given your source selection problems with the 5370A it may be
instructive to run a simple test.
Connect a low frequency
The positive supply connection to A22:U7 (LM339 quad comparator) is
shown as ground in the circuit diagram.
This is surely incorrect as the inputs of U6B and U6C are connected to
TTL(+5V VCC) signals.
Surely this is not the designers intention
The positive supply of A22:U7 should be +5V.
Is
Correction to previous post. (typed U7 instead of U6 VVC connected too
ground OK for U7 as inputs are ECL levels. )
The positive supply connection to A22:U7 (LM339 quad comparator) is
shown as ground in the circuit diagram.
This is surely incorrect as the inputs of U6B and U6C are connected to
Fix for yet another typo, I really should check the text more carefully.
The positive supply connection to A22:U6 (LM339 quad comparator) is
shown as ground in the circuit diagram.
This is surely incorrect as the inputs of U6B and U6C are connected to
TTL(+5V VCC) signals.
Surely this is not
Dr Bruce Griffiths wrote:
Correction to previous post. (typed U7 instead of U6 VVC connected too
ground OK for U7 as inputs are ECL levels. )
The positive supply connection to A22:U7 (LM339 quad comparator) is
shown as ground in the circuit diagram.
This is surely incorrect as the inputs
Since I have only one readily accessible spare OCXO at the moment and I
want to get the procedure right before I take anything else apart, I
will feed the output of the 10 MHz reference from the 5370 into the
START channel, and my DUT into the STOP channel and select SEP instead
of START
Dr Bruce Griffiths wrote:
John Miles wrote:
In the 5370B manual (2940A prefix), it looks like they are running U7
from
+5 on pin 3 and -5.2 on pin 12. Probably a drafting error in the -A
manual.
-- john, KE5FX
Dr Bruce Griffiths wrote:
Correction to previous post. (typed U7
Stephan Sandenbergh wrote:
Hi Bruce,
You mentioned that locking to a crystal at the receiving end as an option.
Does this mean that signal transmission is primarily plagued by short term
noise?
I have never really touched the topic of optical fibre, but I realise that
it is superior to
Tom Van Baak wrote:
Since I have only one readily accessible spare OCXO at the moment and I
want to get the procedure right before I take anything else apart, I
will feed the output of the 10 MHz reference from the 5370 into the
START channel, and my DUT into the STOP channel and select SEP
Well, the idea was precisely to adjust the loop parameters in software
on the PC, which would probably be easier than in hardware, with the
time constants involved, then once those are established, implement them
in a uC or in analog hardware.
Is this a project to prototype and build a
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