I have created a Github project for the Python Labtools I'm using
to deal with my instruments.
https://github.com/bsdphk/pylt
What ?
==
This is a set of python classes for communicating with IEEE488/GPIB
instruments which I use in my private lab.
The base class is pylt - PYthon
Having two HP CBT's minus enclosure sitting on my window sill, allow me to
ad my two cents worth. Looking at the assemblies I see more art than
science and duplicating something like that would most likely end in failure.
Comparing that to the previous H Maser discussions the collective know
Hi Poul,
I sure am glad someone other than just me is using python to control
their GPIB instruments. What you have done looks quite nice. I was
a little more back-of-the-envelope with my stuff, and basically kept
the low level stuff with the upper level control functions. Your way
is better.
On 01/15/2011 11:20 AM, Jean-Louis Noel wrote:
Hi Robert,
From: Robert Vassar rvas...@rob-vassar.com
You could probably safely handle a small quantity of Rb in a home lab
environment for a short period of time. Pure Cesium would be a
significant risk.
As you can see on page 28 vials remains
Hi Magnus,
From: Magnus Danielson mag...@rubidium.dyndns.org
As you can see on page 28 vials remains untouched till everythings are
in place
and else broken.
No, do read at page 27 first. There is some handling in a glove-box filled
with argon and movement from that one before final
In message 4d32fef2.5000...@erols.com, Chuck Harris writes:
I was
a little more back-of-the-envelope with my stuff, and basically kept
the low level stuff with the upper level control functions.
Yeah, that's how I started out also, and then I ended up in the
now where did I put that function I
On 01/16/2011 04:38 PM, Jean-Louis Noel wrote:
Hi Magnus,
From: Magnus Danielson mag...@rubidium.dyndns.org
As you can see on page 28 vials remains untouched till everythings are
in place
and else broken.
No, do read at page 27 first. There is some handling in a glove-box
filled with argon
The vials are commonly broken in vaccuo with a magnet and steel plunger.
-John
===
Hi Magnus,
From: Magnus Danielson mag...@rubidium.dyndns.org
As you can see on page 28 vials remains untouched till everythings are
in place
and else broken.
No, do read at page 27 first. There
What interested me was the beam collimator. I'd thought the beam would be
collimated and small diameter like a LASER, but the setup clearly is to
produve a beam of Cs maybe 1 to 1.5 inches in diameter.
-John
=
On 01/16/2011 04:38 PM, Jean-Louis Noel wrote:
Hi Magnus,
From:
Baring any holdover events, the long term output of a properly configured
tbolt should exceed any single cesium source or maser. If you assume the 1 PPS
signal is always accurate to 5 ns that is an error of 1 part in 1.6E16 at
tau=1 year.
Also, there is code in Lady Heather that
By the way that is why I repeatedly have asked the list if there is any
long term Tbolt data out there comparing the 1 PPS or the 10 MHz with a Maser.
I hope this is worth two cents.
Bert Kehren
Bert,
Here's a 4+ day run between a TBolt 10 MHz and maser.
Phase samples are 1 Hz, units are
Hi:
More than half the electrolytic caps in this Heathkit GC-1000 Most
Accurate Clock are bad and I'm trying to come up with modern replacements.
http://www.prc68.com/I/HeathkitGC1000.shtml#Rx
The Tone Decoder board uses a couple of NE567 PLL ICs to capture the 100
Hz and 1000 Hz WWV tones.
Hi
I see a degree or more over the weekend sitting on the bench. With some effort
that can be brought down to a half degree or so.
The real question is weather you see the signature of the temperature showing
up in the EFC plot. To be precise do you see the signature of the lab
temperature,
Thank you. Bert Kehren
In a message dated 1/16/2011 12:03:53 P.M. Eastern Standard Time,
hol...@hotmail.com writes:
Baring any holdover events, the long term output of a properly configured
tbolt should exceed any single cesium source or maser. If you assume the
1 PPS signal is
Anyone played with one of these ?
http://www.gpscreations.com/NewFiles/GPS1A%20Brochure.pdf
info on the SiGe receiver IC
http://ccar.colorado.edu/gnss/files/SE4110L_Datasheet_Rev3.pdf
-pete
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To
Hi
While I agree with the idea of a super GPS as being a good standard, there
are some reasons for needing something else:
1) You need something to compare *your* GPS gizmo to in your setting. Knowing
that it might be working ok is not as good as knowing that it is working ok.
2) Without some
1 OR 1.5 INCHES IS ONLY ONE OF THE DIMENSIONS.
THE OTHER ONE IS SMALLER, AND THE BEAM IS NOT CIRCULAR ( OR NOT CONICAL).
At 17:44 16.1.2011, you wrote:
What interested me was the beam collimator. I'd thought the beam would be
collimated and small diameter like a LASER, but the setup
Hi Pete:
The SiGe receiver IC is not much use by itself since you need to
literally be a rocket scientist in order to process its output data.
The GPS1A, with open source software is interesting, but again you need
to be a rocket scientist to modify the code.
Have Fun,
Brooke Clarke
On 1/16/11 12:12 PM, Brooke Clarke wrote:
Hi Pete:
The SiGe receiver IC is not much use by itself since you need to
literally be a rocket scientist in order to process its output data.
The GPS1A, with open source software is interesting, but again you need
to be a rocket scientist to modify the
On Jan 16, 2011, at 3:00 AM, Poul-Henning Kamp wrote:
I have created a Github project for the Python Labtools I'm using
to deal with my instruments.
Looks nice. While GUI tools like LabView have their role, I'm more often
interested in remote
monitoring and control.
Probably the next thing
Also how about using Aluminum Organic Polymer caps (where there are
replacements) instead of the plain electrolytic caps?
One problem with using low ESR caps is that some regulators depend upon the
ESR for stability.
The plan is to replace all the electrolytic and tantalum caps since the
Hello,
I was inspiring by PHK's post of his open-source GPIB monitoring system to
mention
that I'm working on remote monitoring and control of my newly acquired PRS-10.
I've read the posts in the lists archive about how the discipline against a
GPS external PPS is not optimal.
I've been working
In message c7d5ad5f-1c94-458e-8f16-19d7c11b3...@rosenberg.net, Kevin Rosenber
g writes:
On Jan 16, 2011, at 3:00 AM, Poul-Henning Kamp wrote:
Probably the next thing I'd add to your system is the ability to
select my Prologix ethernet controller, rather than the USB controller.
I'll send you a
Dear Mark, Warren, Arnold,Bob and Charles,
Thank you all for the interesting responses. I am most interested about
the implemented temperature control in Lady Heather:
I see that there is a setpoint to be entered via 't'+'t', but I am
uncertain about the function of it. From the heather.cpp
Hi Brooke,
Our electronics designers (@automotive electronics supplier) have to
take lot of care concerning voltage stabilizers, that the cap provides
sufficiently low ESR, which electrolytics deliver only at much higher
capacitance value; and a series resistor is introduced to limit loading
p...@phk.freebsd.dk said:
Where to find the instruments is obviously something that should be
abstracted once more people starts to use this, I'm open to both suggestions
and patches in that respect.
How about a config file?
I think it needs something like:
A symbolic name (used by top
In message 4d336a19.40...@freenet.de, Dr. Frank Stellmach writes:
High cap value Ceramics are available since years, [...]
Can you clarify one thing for me: When I studied datasheets for these
it looked like they drop 50% of their capacitance at a DC voltage
of 10-20V.
Doesn't that make them a
In message 20110116221429.af8d5800...@ip-64-139-1-69.sjc.megapath.net, Hal Mu
rray writes:
How about a config file?
Yeah, that bit is obvious, the trouble is all the something like :-)
I'm a firm beliver in Gettys principles for software development,
number 3 of which says:
3.The only
Has anyone had any experience with the demo gps receiver being sold on
Ebay by Sure Electronics.
I have been running one, off and on, for about a month.
The stability of its position plots is unbelievable compared to similar
plots from Motorola Oncore, Garmin and Trimble Thunderbolt receivers.
I have found that such high dielectric constant capacitors have other
problems in some circuits. While the capacitance value is dropping,
as much as 50% when you apply voltage, their physical volume is
changing. They behave as piezoelectric transducers.
I have used them inappropriately, and
That would be my preferred method.
-Chuck Harris
Poul-Henning Kamp wrote:
...
Create a pylt_site.py containing something like:
import hp34401a
import hp33120a
def hp34401a():
return hp34401a.hp34401a(name=/dev/ttyfoo, adr=11)
def hp33120a():
Can you clarify one thing for me: When I studied datasheets for these
it looked like they drop 50% of their capacitance at a DC voltage
of 10-20V.
Doesn't that make them a so-so bargain for power supply bulk capacitance ?
Poul-Henning,
Pls. check the spec for dielectric material.
X5R is
Hi
The other thing to watch out for is the temperature coefficient. Some of the
high K materials move a *lot* with modest changes in temperature. There are
indeed industry standards on what a given dielectric code should be. In some
cases there have ben liberties taken interpreting the codes.
Got a link ? A search on Sure Electronics comes up empty.
73, Dick, W1KSZ
-Original Message-
From: Rix Seacord eseac...@verizon.net
Sent: Jan 16, 2011 3:35 PM
To: time-nuts@febo.com
Subject: [time-nuts] Sure Electronics GPS
Has anyone had any experience with the demo gps receiver being
In message a9103007-9686-4310-a9e5-aa8b193d1...@rtty.us, Bob Camp writes:
In a modestly warm box (say 60 C) the net effect between voltage
and temperature may be that you have 1/4 your original capacitance.
That was sort of my conclusion too, not exactly the first thing that
springs to mind
I have found that such high dielectric constant capacitors have other
problems in some circuits. While the capacitance value is dropping,
as much as 50% when you apply voltage, their physical volume is
changing. They behave as piezoelectric transducers.
I have used them inappropriately,
If you've ever worked on more than a very few Tektronix TM-500 series modules,
you are well aware of the favorite epoxy dipped tantalum capacitor failure
mode... very low resistance dead short... usually ending up in a charred
stinky black blob. Whatever manufacturer they chose... was the
Sorry, epcos sold ceramics business, and was itself swallowed by TDK.
If looking for X5R and X7R cer caps, visit vishay, kemet, taiyo yuden,
murata and others instead.
This special material specification is well hidden at the official
manufacturers specs.
Those are high grade ceramic
I have purchased many items over the past few years from Sure and have never
been dissapointed in that I receive. They do seem to have multiple seller
accounts, each with different items - sureelectonics sureelectronics1
sureelectronics2 etc.
Any way, I did a serch by seller and found a
On 01/16/2011 09:12 PM, Brooke Clarke wrote:
Hi Pete:
The SiGe receiver IC is not much use by itself since you need to
literally be a rocket scientist in order to process its output data.
The GPS1A, with open source software is interesting, but again you need
to be a rocket scientist to modify
On 1/16/11 5:19 PM, Magnus Danielson wrote:
On 01/16/2011 09:12 PM, Brooke Clarke wrote:
Hi Pete:
The SiGe receiver IC is not much use by itself since you need to
literally be a rocket scientist in order to process its output data.
The GPS1A, with open source software is interesting, but again
Brooke,
WTF ! Just replace them with the same type as was in there. That will give you
another 20 or so years and by then you will be dead and won't give a damn.
The only critical (for that time) component would be the TC loop capacitors
for
the 567 PLL's. They should be silver mica types
There is some info on implementing the temperature controller in the comments
at the start of the file heather.cpp
You can use something the simple single ended transistor driver that Warren
described or use a DC solid state relay. The program can manipulate two of the
RS-232 port control
I was looking at one of these units for the conversion project for the
468 clocks, sounds like these might be good units. I think I searched
for gps and rs232 and hit them on the first page.
JIm
On 1/16/2011 5:07 PM, Tom Clifton wrote:
I have purchased many items over the past few years from
Thanks, I needed that (wiping off the cold water [I hope] from the
deluge delivered).
Indeed, there is nothing special about 60 Hz (even though Hertz
never resonated anything at 60 cycles per second) filter capacitors.
There is nothing special about 100 and 1000 cps PLLs either. A good
plastic
Dick and Tom
The gps is sold on ebay in several different versions.
The don't have a web site under their name. The manual, virtual drivers
and software are down loadable via their ebay offer. There is a
www.sure-electronics.com site but it takes you to ebay.
The one I have uses a skylab
I found those too. But also found many Motorola units that had what I
thought were better specs, and certainly better written user manuals.
I guess you could run the suplied software and then snoop on the
serial interface to figure out what commands the sure GPS accepts.
Can it be put into
On Jan 16, 2011, at 9:00 PM, Mark Sims wrote:
There is some info on implementing the temperature controller in the comments
at the start of the file heather.cpp
Hi Mark,
Thanks very much for the information. I wasn't actually aware that Heather was
open-source.
That's great as I can read the
With that in mind, I wonder how accurate is their 1pps output?
Pretty good for $40.
About 60 ns peak-to-peak (22 ns stdev) about the mean.
/tvb
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Dear Poul,
Excellent! Looking forward to playing with it more.
On a related note, O'Reilly has a new book out on developing
instrument control software
using Python:
Real World Instrumentation with Python: Automated Data Acquisition and
Control Systems by
John M. Hughes
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