Another FORTH fan here.
Originally written to control radio telescopes -- hardware was changing all
the time so the language was by definition designed to be extensible. Want
to add a function? Define it, give it a name and bingo...
Sometimes less __IS__ Moore.
-Original Message-
Adrian,
On 15/11/12 03:59, Adrian wrote:
Hi Edgardo,
however, the 53132A is considerably more sensitive in frequency mode as
we have recently discovered.
I saw an astoundingly low ADEV noise floor of some 6E-13 at t=10 sec as
opposed to only 2.5E-11 in TI mode.
I don't have a 53132A, only a
Interesting this, but why exactly 60pS? I would expect also something
in-between. That is, to have the 5MHz energy 64dB below, in my opinion
nothing prevents to have the edge to wander not only at 60pS but
continuously between 0 and 60pS. Maybe the SR620, being a 25pS resolution
counter, simply
Hi
The 5 MHz and 10 MHz are locked together by the multiplier. Their relative
phase is fixed. The 5 MHz component is not free to wander independently
relative to the 10 MHz. Since it's a doubler, you get a two peak plot. If it
was a X3 you would get three peaks. It really only makes sense if
Goodness FORTH and a R1051. Who would have thought.
I am a big fan of forth also. Loved the way you could extend the
dictionary. Plus it ran like a bat out of heck fast. Like you I went
through ETA school as the second class to be trained on the 1051. At
$27,000 each did not think I would ever own
Hi Magnus,
when I noticed the difference between frequency and time interval mode
on my 53131A, I compared some sources in both modes.
There was little difference between both modes where the signal was
above the TI mode noise floor.
Below that t-range (that is, below the point where in TI
In the meantime I heard that Wavecrest is not distributing service
manuals. All repair is depot.repair.
This makes me considering if I should take the chance on a second unit,
hoping to get one working out of two, or simply to give up and accept
that these boxes are only intended to be used
I've never been confronted with such a poor customer sevice
attitude before.
Have you bought an instrument as complex as at DTS 207x recently ?
From the mid 90's this has become the norm even with companies that were
bastions of the quality of their service manuals such as Tek and Agilent (HP)
@Azelio: Yes, (like Bob told) it's the phase lock, that locks the two
maxima. Actually the counter is able to look between the 60ps spaced
towers, have a look at the pictures in the first mail of this thread.
However, there is a smallest time value the counter can determine, but
it is much
On 16/11/12 23:48, J. Forster wrote:
PayPal is pretty much a law unto itself. Basically, if you choose to
become involved with them, it's their bat, ball, glove, and ballpark. Your
only real alternative is to play another game.
Unfortunately, the younger generation of eBay sellers is convinced
Hi
This is one of those interesting areas where a broadband measurement (like a
counter) and a narrowband measurement (like a DMTD) will give very different
results. The counter will see the sub-harmonic, and call it jitter. It can show
up in an ADEV calculation. A DMTD will ignore the
...A PLL multiplier will (likely) also ignore the sub-harmonic, the
jitter will not show up if you use the 10 MHz as a counter timebase
in a HP counter...
Yes, I wondered what the histogram would show when using the
2-maxima-Z3805 signal as a reference for the SR620 counter. Would the
PLL
Hi
Most modern counters have an internal oscillator that they lock up to the
external reference. The PLL bandwidth is (hopefully) chosen to optimize the
noise contribution of the internal oscillator (quiet broad band) and the
external reference (quiet close in). It will reject anything MHz
As far as I can see the PLL loop filter (SR620) has a corner frequency
of about 33Hz. My HP counter 5385A has simply a switch to toggle between
the external source and the internal osc.
Am 18.11.2012 22:45, schrieb Bob Camp:
Hi
Most modern counters have an internal oscillator that they
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