albertson.ch...@gmail.com said:
Question: Can anyone measure the pulse? How wide is it and what is the
voltage?
Ignacio said it was 1 us wide.
I don't have a 5680A to look at, but all the PPS pulses I have looked at are
at least a few volts. They are easy to see on a scope. One common
I've had the pleasure of playing with one of these, when I was under
contract to a UK company that was selling Timing Solutions products before
they were bought by Symmetricom. A really nice piece of kit and very easy to
use. Would be a great addition to any timing lab, but outside my personal
On 1/5/2012 12:33 AM, John Miles wrote:
Grab the latest release from www.miles.io/timelab/readme.htm if you like --
it will acquire from the TSC 5125A for as many hours/days as the TSC's
Ethernet connection will stay up. (Which sometimes isn't very long.)
TimeLab generates its
To get around this, you can use the TSC's frequency counter output which
gives 14 or 15 digit measurements. However, you need software to
manually poll for the fcounter data, and you can't get precise tau from
it since the updates don't seem to happen synchronously. I ended up
writing a
There will be a leap second the end of June 2012.
John WA4WDL
--
From: IERS EOP Product Center services.i...@obspm.fr
Sent: Thursday, January 05, 2012 9:16 AM
To: bulc.i...@obspm.fr
Subject: Bulletin C number 43
INTERNATIONAL EARTH
On Thu, 05 Jan 2012 01:44:13 -0800, Hal Murray
hmur...@megapathdsl.net wrote:
albertson.ch...@gmail.com said:
Have an older Tek 465 scope that is in only fair shape and I see nothing
on that pin but milivolt level sine wave of about 60MHz. I can't set the
scope to show any hint of a PPS ...
Hi
I have seen a 5125 do random reboots on a every few weeks basis. I suspect
it's either a problem box or we have a power glitch that it's uniquely
sensitive to.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of John Miles
Sent:
On Fri, 30 Dec 2011 22:54:26 -0800
Chris Albertson albertson.ch...@gmail.com wrote:
I don't count anything with a computer and software inside as
simple. My definition of a simple device is a capacitor or a
transistor or I guess a single flip-flop or op-amp. A simple
controller would some
I think there is something funny about the 1 PPS output on pin 6 from the
currently available cheap FE-5680A units. I have three of these units. On one
unit, on one occasion, I did observe a logic-level 1 PPS pulse, exactly 1
microsecond wide. But after a power cycle it never came back,
On 05/01/2012 16:49, David wrote:
On Thu, 05 Jan 2012 01:44:13 -0800, Hal Murray
hmur...@megapathdsl.net wrote:
albertson.ch...@gmail.com said:
Have an older Tek 465 scope that is in only fair shape and I see nothing
on that pin but milivolt level sine wave of about 60MHz. I can't set the
Okay, I've cooled off - a bit. The bottom line is that the 10 MHz
output of the CW12 isn't appropriate for what I wanted to do. Ah, the
joys of reading and understanding a spec sheet!
But let's not throw out the baby with the bathwater. Although the 10
MHz output has it's issues for
On Thu, Jan 5, 2012 at 9:46 AM, beale be...@bealecorner.com wrote:
I think there is something funny about the 1 PPS output on pin 6 from the
currently available cheap FE-5680A units. I have three of these units. On
one unit, on one occasion, I did observe a logic-level 1 PPS pulse, exactly
1
On Thu, 05 Jan 2012 18:54:31 +0100, EB4APL
eb4...@cembreros.jazztel.es wrote:
On 05/01/2012 16:49, David wrote:
On Thu, 05 Jan 2012 01:44:13 -0800, Hal Murray
hmur...@megapathdsl.net wrote:
albertson.ch...@gmail.com said:
Have an older Tek 465 scope that is in only fair shape and I see
If you use a Tektronix TDS series scope you can set the acquiring to peak
detect instead of sample to let the PPS be visible even for long timebase
run. That is: usually, with the trigger set to normal and the timebase to
100nS/div or 1uS/div you can see the PPS anyway. If you set the timebase to
Great, don't forget to specify what reference your measurements were made
from (or did I miss anything from your posts?).
We use the CW12 PPS for our GPSDOs.
On Thu, Jan 5, 2012 at 6:57 PM, Ed Palmer ed_pal...@sasktel.net wrote:
Okay, I've cooled off - a bit. The bottom line is that the 10 MHz
The 2230 like I have was the earliest Tektronix oscilloscope with peak
detect that I know of. Everything after it with some odd exceptions
like the TDS 620 series included peak detect.
I bought and fixed the 2230 instead of a new Rigol just for the peak
detect. The low end Rigol oscilloscopes
All the wonders of the TSC boxes aside, there is one really annoying
thing you need to keep in mind when working with the phase data: the box
applies an arbitrary phase offset that reflects through to the phase
data output. It appears as a linear frequency offset that needs to be
removed
Do you mean the reference oscillator for the 5372A? That was the
internal 10811 OCXO. Over a 1000 sec. run, drift wouldn't have any
affect on these numbers.
Ed
On 1/5/2012 12:54 PM, Azelio Boriani wrote:
Great, don't forget to specify what reference your measurements were made
from (or did
I found it, I used the +15 V of my triple output supply to power the
pin 4, +5 V input. A 75ACT240 popped up and who knows the health of the
other things.
Wish me luck,
Ignacio, EB4APL
El 05/01/2012 18:54, EB4APL wrote:
I agree, I've seen it in a Tek 7623A with the storage on, it is
Doh!
Hopefully anything directly connected to that 5 volt supply pin can be
replaced if neccessary.
On Thu, 05 Jan 2012 20:37:06 +0100, EB4APL
eb4...@cembreros.jazztel.es wrote:
I found it, I used the +15 V of my triple output supply to power the
pin 4, +5 V input. A 75ACT240 popped up and
I did something similar- momentary contact of +15V supply with one of the other
pins- might have been the +5 Vin, or another signal. The 75ACT240 became very
hot. I ordered a replacement 75ACT240 part, swapped it in, and the unit seems
to work fine now. Note this is the 0.3 wide device,
Yes almost as long as you include ONE more Resistor, R2 added below.
The dual cap thing does not get rid of leakage entirely, but close enough in
most cases.
That configuration is most useful for slow open loop filters when you want
low leakage errors.
It may be a bit of an overkill for a
OK, thank you.
On Thu, Jan 5, 2012 at 8:29 PM, Ed Palmer ed_pal...@sasktel.net wrote:
Do you mean the reference oscillator for the 5372A? That was the internal
10811 OCXO. Over a 1000 sec. run, drift wouldn't have any affect on these
numbers.
Ed
On 1/5/2012 12:54 PM, Azelio Boriani
John,
You are not alone in this trip. Another member of this list tells me
that he connected the power to the lock indicator pin when he received
his unit and he was eager to test it. His 74ACT240 also got cooked but
the rest of the unit continued working normally.
Well, mine seems to have
Hello Tom,
haven't tried the raw data capture yet. It would be nice if they would have
added support for USB thumb drives to store this type of data, and plots
etc.
But it does have internal RAM, they could have allocated a Mbyte or so for
data-storage..
BTW: my unit used to reset
Will try it John!
Thanks,
Said
In a message dated 1/4/2012 21:35:00 Pacific Standard Time, jmi...@pop.net
writes:
Grab the latest release from www.miles.io/timelab/readme.htm if you like --
it will acquire from the TSC 5125A for as many hours/days as the TSC's
Ethernet connection will
Hi Chris,
The documentation I have says pin 6 is N/C but it looks like there is a
way to extract a usable PPS but I think I'm going to need and LC filter,
some op amps and a one-shot and a TTL level driver. My guess is that pin
6 is either some kind of engineering test/diagnostic signal not
I have googled extensively trying to find something about the dual
capacitor method of reducing the leakage current... nothing found. Please,
can you indicate anything for me to learn more?
Thank you
On Thu, Jan 5, 2012 at 9:18 PM, WarrenS warrensjmail-...@yahoo.com wrote:
Yes almost as long
On Thu, Jan 5, 2012 at 1:48 PM, b...@lysator.liu.se wrote:
Hi Chris,
The documentation I have says pin 6 is N/C but it looks like there is a
way to extract a usable PPS but I think I'm going to need and LC filter,
some op amps and a one-shot and a TTL level driver. My guess is that
pin
(Context is using a Tek 465 to look at a narrow PPS.)
davidwh...@gmail.com said:
Now turn up the Intensity until you can see the pulse. It might
help to turn down the room lights.
This is the problem. With a 1 second repetition rate, the brightness is
going to be very low.
For me, the
Leap second has been announced for July.
Jim
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Perhaps the dual cap is a differential implementation of the filter/integrator.
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... don't know but judging from the very simple ASCII schematic I'll say no
because the lower capacitor is grounded. There is some sort of feedback I
can't figure out, too simple that schematic.
On Thu, Jan 5, 2012 at 11:27 PM, li...@lazygranch.com wrote:
Perhaps the dual cap is a differential
In message
CAL8XPmO76XuTETZC=33_v2YWuJGcw8gCvtTDHyae6E4MFb18=g...@mail.gmail.com
, Azelio Boriani writes:
I have googled extensively trying to find something about the dual
capacitor method of reducing the leakage current... nothing found. Please,
can you indicate anything for me to learn more?
Chris,
On Thu, Jan 5, 2012 at 1:48 PM, b...@lysator.liu.se wrote:
Hi Chris,
The documentation I have says pin 6 is N/C but it looks like there
is a
way to extract a usable PPS but I think I'm going to need and LC
filter,
some op amps and a one-shot and a TTL level driver. My guess
Poul
Thanks have been kind of following this thread and the diagram did not make
a lot of sense.
I figured I missed part of the thread. But this clears it up nicely.
Regards
Paul.
WB8TSL
On Thu, Jan 5, 2012 at 5:49 PM, Poul-Henning Kamp p...@phk.freebsd.dkwrote:
In message
Thanks. Me too: now I got it, sort of bootstrap and now I see that R2 is
needed because the real filter is R2*C2 and the leakage is not totally
compensated if C1 has to move to a new value - R*C1R2*C2.
On Fri, Jan 6, 2012 at 12:00 AM, paul swed paulsw...@gmail.com wrote:
Poul
Thanks have been
I, too, am one that cleverly managed to cook the '240 chip: Too many
clip leads in too small a space allowed the +15 to get into the lock
indicator pin while I was evaluating the unit. It, too, worked OK after
doing that.
Rather than order another 74ACT240 or even just an HC/T240, I
Can anyone recommend how to power one of the latest crop of 2nd hand
FE-5680As? Are they the ones that need only 15-18vdc, or do they need the
5v line as well?
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Tom Van Baak said the following on 01/05/2012 02:27 PM:
John, could you expand on your comment about the ethernet connection?
I have seen random instances where the TSC seems to lose its TCP/IP
settings, but so far it's never happened during a measurement run, so
has been annoying but
If it is labeled FEI P/N 217400-30352-1 the response is yes.
Ignacio, EB4APL
On 06/01/2012 1:55, Ian Bobbitt wrote:
Can anyone recommend how to power one of the latest crop of 2nd hand
FE-5680As? Are they the ones that need only 15-18vdc, or do they need the
5v line as well?
Tom Van Baak said the following on 01/05/2012 02:27 PM:
I see this on the TSC 5120 but not the 5110. Same for you? When
in single DDS mode the 5110 phase is absolute. But when in the
dual DDS mode the raw phase output is scaled by B/A frequency,
which is displayed at the lower right side of the
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1
EB4APL wrote:
If it is labeled FEI P/N 217400-30352-1 the response is yes.
Ditto - this is the same P/N of the one I have. It takes both a 15 V and a 5 V
supply.
The pin numbers reported here earlier are correct:
PIN 1: INPUT +15V to +18V
PIN 2:
On Thu, Jan 5, 2012 at 4:44 PM, C. Turner tur...@ussc.com wrote:
On random things, on one of my units it had the section of the board
populated with the +5V switching regulator - but it was not powered up: A
bit of sleuthing around with an ohmmeter and with the help of the data
sheet for
Anyone contemplating building an analog loop for a GPSDO should
consider that it can be very tricky and expensive to attain great
performance. That's why the commercial ones are primarily digital -
it puts the most severe performance requirements in the least amount
of analog circuitry - the
Thanks, but what are people using to feed it? I'm having trouble pinning down
power requirements. http://www.freqelec.com/rb_osc_fe5680a.html says 32W peak,
but then also 15-18v@700mA, which doesn't make sense. I'm still waiting on the
slow boat from China, so I have a while to find a power
On Thu, Jan 5, 2012 at 4:55 PM, Ian Bobbitt time-n...@custodes.info wrote:
Can anyone recommend how to power one of the latest crop of 2nd hand
FE-5680As? Are they the ones that need only 15-18vdc, or do they need the
5v line as well?
The latest batch of $40 units require +5V too. I measure
I have used that trick also for HV supplies when leakage through a capacitor
(typically the capacitor used to compensate the HV divider used for regulation)
exposed to 10 or 20kV is hard to eliminate.
At the time, I did not know it had already been invented...
Didier KO4BB
Sent from my
On Thu, Jan 5, 2012 at 6:11 PM, time-n...@custodes.info wrote:
l http://www.freqelec.com/rb_osc_fe5680a.html says 32W peak, but then
also 15-18v@700mA, which doesn't make sense.
It will pull 35W for the first five or so minutes then the current drops
rather suddenly to about 700mA.
I have an
On start up from cold condition, 15V at 1.8Amps -2.1Amps (27W -31.5W)
Running after warm up, 15V at 800mA (12W)
Plus 5V at 85mA (0.425W)
John WA4WDL
--
From: time-n...@custodes.info
Sent: Thursday, January 05, 2012 9:11 PM
To: Discussion of
Most laptop supplies operate around 19 or 20 volts. Its a good place to start
if you want to get 15V through a linear regulator.
I have used Nintendo Wii supplies for 12V applications that require less than
3.5A. Chinese clones of those can be bought on eBay for less than $10 with
shipping.
On Jan 5, 2012, at 9:33 PM, shali...@gmail.com wrote:
Most laptop supplies operate around 19 or 20 volts. Its a good place to start
if you want to get 15V through a linear regulator.
I have used Nintendo Wii supplies for 12V applications that require less than
3.5A. Chinese clones of
You've had more progress than I did, I don't get anything out of pin 6. I
did see the levels toggle, but that was about it. On various websites I
read to get exactly 1pps, you need a programmable 5680 because it needs to
be set to something like 8.388MHz (2^23) to divide down properly. I
On Thu, Jan 5, 2012 at 8:45 PM, Robert Benward rbenw...@verizon.net wrote:
You've had more progress than I did, I don't get anything out of pin 6. I
did see the levels toggle, but that was about it. On various websites I
read to get exactly 1pps, you need a programmable 5680 because it needs
On Thu, Jan 5, 2012 at 6:11 PM, time-n...@custodes.info wrote:
Thanks, but what are people using to feed it? I'm having trouble pinning
down power requirements. http://www.freqelec.com/rb_osc_fe5680a.html says
32W peak, but then also 15-18v@700mA, which doesn't make sense. I'm still
waiting
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