Interestingly, HP for a long time sold"quartz thermometers" based around a
probe with a quartz crystal with a well characterized linear temperature
coefficient. They called the crystal cut "LC" (Linear Coefficient):
http://www.hpl.hp.com/hpjournal/pdfs/IssuePDFs/1965-03.pdf
http://en.wikipedia.or
Hi,
I use a HP3468A multimeter to measure a PT100 platinum resistance thermometer.
It gives me resolution of one mK, but calibration is another matter.
It is best to use a 4 terminal device, but 2 terminal into the 4 terminal input
works well. Thermoelectric effects and the requirement for 1 micr
I've been on the FMT forum, I hate those yahoo groups and refuse to re-join
them, nearly everytime I would go there, I had to renew my membership or change
my password. Not the people, just the interface. I don't believe in yahoo any
more and have blocked it from my computer except the few peo
On 12/09/2013 03:43 AM, wb6bnq wrote:
> Hi Magnus,
>
> If the TAPR module you are referring to is the ICS-501 thing, that is
> really not suitable for this purpose. Equally, neither are the DDS
> chips. Besides never being right where you want them you have the
> spurii to deal with. Way too muc
Dave -
Let me call your attention to the FMT nuts list if you are not already on it
(I didn't find an entry from you in the November ARRL FMT).
I'm not sure how many of the gurus there are on this one, although the HP
3586B is a tool used by some. I myself depend on some HP gear, a 105B and
8640B.
Hi Magnus,
If the TAPR module you are referring to is the ICS-501 thing, that is
really not suitable for this purpose. Equally, neither are the DDS
chips. Besides never being right where you want them you have the
spurii to deal with. Way too much filtering required. These two items
aside
Bill,
On 12/09/2013 02:30 AM, wb6bnq wrote:
> Hi Dave,
>
> My question was more centered on determining your expectations. I ran
> into an even worse condition with the cheap sound card, in my shop
> computer, I used for the Frequency Monitoring Tests (FMT) ran by
> Connie (K5CM). Being in a spa
Well, thanks for the comments. I really didn't know what to expect from the
SoundBlaster card. I thought AM stations were better than that. I started
everything cold today and the 1K from the SM started at around 999.998600 and
drifted up to 999.999800 in about an hour and half, stayed there ar
Hi Dave,
My question was more centered on determining your expectations. I ran
into an even worse condition with the cheap sound card, in my shop
computer, I used for the Frequency Monitoring Tests (FMT) ran by Connie
(K5CM). Being in a space with no temperature control at all, the sound
ca
I missed the start of this thread but it you need it many computer audio
interfaces can be run off an external clock. It is really common to do
this in a studio setup.
You think "does it matter? Can humans hear a 10ppm difference in pitch?"
No but if you make two recordings each using a differe
Dave wrote:
I also measured some AM stations and I had drifts of 56 mHz for a
1030 KHz station, and I have measured the DSP drift as around 14
mHz. Do the AM stations really drift around that much? I thought
they were pretty stable.
The FCC requirement for AM stations is +/- 20 Hz. It is
On 12/08/2013 11:46 AM, Attila Kinali wrote:
> Hi Magnus,
>
> On Fri, 29 Nov 2013 17:42:25 +0100
> Magnus Danielson wrote:
>
When I look in the data sheets of oscillator that I find on the internet,
they only have precision estimates like 1ppm or 1ppb, but no detailed allan
variance
> Well, the question is do you think that is good or bad for the sound card ?
Low cost crystals make reasonable thermometers. Ballpark is 1 PPM/C.
If your system has a good ntp setup, you can use it to measure the actual
sound card clock. With luck (or skill) you can track that over time and
Is the Tektronix p/n on the unit ? it may be 119--xx
On Thu, Dec 5, 2013 at 7:34 PM, Rex wrote:
> I have an SPTB-100. It seems to be a custom version of a standard FRK(LN)
> rubidium for Tektronics.
>
> I got mine around 2000. (Mine is an 88 date-code vs. your ancient 86
> version.) It didn
Hi Magnus,
On Fri, 29 Nov 2013 17:42:25 +0100
Magnus Danielson wrote:
> >> When I look in the data sheets of oscillator that I find on the internet,
> >> they only have precision estimates like 1ppm or 1ppb, but no detailed allan
> >> variance graphs.
> > Yes. Because in the class of cheap AT cu
Servus Wolfgang,
On Sat, 30 Nov 2013 10:32:42 +0100
Wolfgang Wallner wrote:
> At my institute (TU Vienna, Computer Engineering) there has been a
> bachelor thesis which dealt with simulation of IEEE 1588 in OMNeT++ (a
> discrete event simulator).
> But the assumptions where rather simple (both o
On Sat, 30 Nov 2013 06:31:01 -0800
Jim Lux wrote:
> Recently, I've been looking at the variations of some human clocks which
> are millenia old: Galileo used his pulse as a timer for his famous "roll
> balls down a ramp" experimenet". I thought that some time-nuts might be
> interested in wor
Well, Bill, I just don't know. I think that's why I asked. However, I did
measure it again over 2.5 hrs and I got a roughly 500uHz drift pretty much all
in one direction. I'm wondering if this is telling me I'm cabable of measuring
1mHz with some amount of success, I realize I will have to ke
Dave:
What is it that you "almost don't believe" ?
That it is this good? Or that it is this bad?
Remember that the sound card has a sampling clock, that also contributes
to any errors.
If it is a regular computer sound card, then it is using the same $0.33
crystal reference as the
rest of
Hi Dave,
Well, the question is do you think that is good or bad for the sound card ?
BillWB6BNQ
quartz55 wrote:
I've been testing my soundcard measurement capability with Speclab, so I hooked
my LPRO Rb to lock my Moto Service Monitor, fed the 1K audio out into the sound
card and I meas
Sounds about right.
Sent from mobile
> On Dec 7, 2013, at 2:24 PM, "quartz55" wrote:
>
> I've been testing my soundcard measurement capability with Speclab, so I
> hooked my LPRO Rb to lock my Moto Service Monitor, fed the 1K audio out into
> the sound card and I measured the freq over about
You could also consider making a simple gadget with your
microcontroller of choice, that presents an interface to the PC of a
fixed baud rate (perhaps 115200) and handles the weirdo split rates
for the GPS gadget on one or two of its other ports.
Henry
On Sat, Dec 7, 2013 at 12:18 PM, Hal Murray
An alternative to writing your own software is using 'socat' which can
interface between a tcp port and serial port (perhaps using a raspberry pi
or the like as the interface). It apparently has settings for separate
ispeed and ospeed. Its competitor, ser2net, doesn't seem to have that
ability.
Th
Sorry if this is somewhat off topic, but I'd be interested in more details re
precision temperature measurement devices. Have been using an inexpensive USB
temperature sensor for the last year or so to monitor the temperature in my lab
and have been looking at the correlation between frequency
Hi Guys,
I have a fully functional HP5370B for sale in the UK - Price is UK£550
International shipping will be at cost, shipping within the UK is included
Anyone interested can contact me theough the list
Cheers,
Pete
___
time-nuts mailing list -- t
I have three of these units, and have been looking for the right
manual for years. Thanks for this part, but I believe the SPTB is
different from the FRK in the schematics and some of the construction
detail - for example, since it's 5 MHz vs 10, that circuit is
different, not just the crystal
26 matches
Mail list logo
