On Oct 5, 2011, at 7:49 PM, Jim Lux wrote:
> There's also the Labjack product... http://www.labjack.com/ USB interface
> for events, ADC, etc. In the $100 range depending on the model.
>
> A few years ago when it first came out, it was a pain because it was Windows
> only, with limited protoco
time-nuts-boun...@febo.com
Date: Tue, 04 Oct 2011 08:40:55
To: Discussion of precise time and frequency measurement
Reply-To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] [Solved] Looking for multiple PPS timestamp logging
On 10/4/11 8:03 AM, Kevin Rosen
On Oct 4, 2011, at 9:10 AM, Bob Bownes wrote:
> If you need a simple/cheap pollable ADC, there is a Velleman kit
> available with USB. Can sample ADC, and a number of discrete inputs as
> well.
>
> And it can now be found on the wall at Radio Shack, strangely enough.
Hi Bob,
That's nice that it'
On Oct 4, 2011, at 10:16 AM, Tijd Dingen wrote:
> You mentioned wanting to use the parallel port under linux for pps purposes,
> right?
Hi Fred, I consider it, but tvb's picPET's will work much better for the
project.
> So if some parallel port programming is acceptable, then you can do the
>
Hi Jim,
Thanks for the thought. I forgot about my Dataq DI-720 which can do
14-bit ADC. However, I'll need to spend more time looking at their
acquisition software.
I haven't seen a way to have WinDaq/Pro output an ASCII log file, though
the software sheet talks about streaming disk files, it ap
t
> Reply-To: Discussion of precise time and frequency measurement
>
> Subject: Re: [time-nuts] [Solved] Looking for multiple PPS timestamp logging
>
> On Oct 4, 2011, at 4:36 AM, Hal Murray wrote:
>> In California, the diurnal temperature swings are big enough to be
Hi Chris,
select is a great idea, but I think I'll be using cygwin which doesn't
appear to have an emulation of select on Windows.
Kevin
On Oct 4, 2011, at 10:23 AM, Chris Albertson wrote:
> On Tue, Oct 4, 2011 at 3:36 AM, Hal Murray wrote:
>>> The temperature swings won't be large, just the u
On Oct 4, 2011, at 11:42 AM, Mark Sims wrote:
> Use an LM34 sensor, not the LM35. It has twice the resolution per volt
> since it outputs in degrees F, not degrees C.
That's a good idea. That's one issue that I have with a 10-bit ADC common to
many MCUs, is the
low voltage of 0.20 to 0.28 mV
measurement
Reply-To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] [Solved] Looking for multiple PPS timestamp logging
On 10/4/11 8:03 AM, Kevin Rosenberg wrote:
> So, if you know of any simple ADC to UART firmwares available, that'd
> be grea
ly-To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] [Solved] Looking for multiple PPS timestamp logging
On Oct 4, 2011, at 4:36 AM, Hal Murray wrote:
> In California, the diurnal temperature swings are big enough to be useful. :)
Here in New Mexico as well, u
Use an LM34 sensor, not the LM35. It has twice the resolution per volt since
it outputs in degrees F, not degrees C.
Better yet, use the DS1620 (old revision) that is used on the Tbolt. It has a
digital interface. It will give you around 0.01C res without any ADC
conversion noise, etc.
On Tue, Oct 4, 2011 at 3:36 AM, Hal Murray wrote:
>> The temperature swings won't be large, just the usual diuneral indoor cycles.
>
> In California, the diurnal temperature swings are big enough to be useful. :)
>
> This is what ntp sees the main/CPU crystal doing in a non airconditioned
> room.
On Tue, Oct 4, 2011 at 11:03 AM, Kevin Rosenberg wrote:
> What I haven't decided is whether to have my son use the 34401A and GPIB
> polling via a Prologix adapter versus a simple MCU firmware using a 2.5V
> reference voltage and a 10-12 bit ADC and outputs the ADC result either
> once a second,
On 10/4/11 8:03 AM, Kevin Rosenberg wrote:
So, if you know of any simple ADC to UART firmwares available, that'd
be great so he can just reference someone else's code. The picPET
is a perfect device at the perfect time. But, we can't rely on tvb
to come up with a 'picADC' at a similarly serendip
On Tue, Oct 4, 2011 at 11:03 AM, Kevin Rosenberg wrote:
>
> What I haven't decided is whether to have my son use the 34401A and GPIB
> polling via a Prologix adapter versus a simple MCU firmware using a 2.5V
> reference voltage and a 10-12 bit ADC and outputs the ADC result either
> once a second,
On Oct 4, 2011, at 4:36 AM, Hal Murray wrote:
> In California, the diurnal temperature swings are big enough to be useful. :)
Here in New Mexico as well, useful or ruinous depending upon your application.
Hence, I believe, your smiley face above ;)
> The swing would be much bigger outside, especi
> The temperature swings won't be large, just the usual diuneral indoor cycles.
In California, the diurnal temperature swings are big enough to be useful. :)
This is what ntp sees the main/CPU crystal doing in a non airconditioned
room. Each color is a different day.
http://www.megapathdsl.ne
> > That looks like a great solution for monitoring oscillators/GPSDOs.
> > Where to find an application that inputs RS232 and writes a file?
> I don't think you need anything very complex for that. One could
> simply "cat" the serial port device to a log file
> cat /dev/tty01 | somename.log
On 10/3/11 5:20 PM, Neville Michie wrote:
> > That looks like a great solution for monitoring oscillators/GPSDOs.
> > Where to find an application that inputs RS232 and writes a file?
>
> Hyperterm?
> Minicom?
> in a DOS box:
> mode COMn:9600,n,8,1
> copy COMn filename
> You could suffer gre
On Mon, Oct 3, 2011 at 5:20 PM, Neville Michie wrote:
> That looks like a great solution for monitoring oscillators/GPSDOs.
> Where to find an application that inputs RS232 and writes a file?
I don't think you need anything very complex for that. One could
simply "cat" the serial port device to
I use a freebie language called Robot Basic. It is very flexible, easy
to use, has a yahoo group of users, and the price is right! It will run
on any of the Win os's and does not require installation, that is does
not use the pesky .net or the registry. .exe files can be made, too.
Don
Neville Mic
On 10/3/11 5:20 PM, Neville Michie wrote:
That looks like a great solution for monitoring oscillators/GPSDOs.
Where to find an application that inputs RS232 and writes a file?
Hyperterm?
Minicom?
in a DOS box
> mode COMn:9600,n,8,1
> copy COMn filename
You could suffer great mental pain and
That looks like a great solution for monitoring oscillators/GPSDOs.
Where to find an application that inputs RS232 and writes a file?
cheers,
Neville Michie
On 04/10/2011, at 6:54 AM, Tom Van Baak wrote:
Hal, Don,
I too have tried all the PC-based (serial/parallel port) solutions.
As we dis
Excellent, Tom. I missed it!
Don
Tom Van Baak
> Hal, Don,
>
> I too have tried all the PC-based (serial/parallel port) solutions.
> As we discussed at lot with the TEC thread, they work pretty
> well. But for general use, or stand-alone operation, what I use
> for dirt cheap non-nanosecond timing
On Oct 3, 2011, at 12:59 PM, Hal Murray wrote:
> Why do you need microsecond resolution?
>
> A junk XO will drift ballpark of 1 PPM per C. That's 86 ms per day or 3.6 ms
> per hour.
The temperature swings won't be large, just the usual diuneral indoor cycles.
He wants to use compute much much o
Hal, Don,
I too have tried all the PC-based (serial/parallel port) solutions.
As we discussed at lot with the TEC thread, they work pretty
well. But for general use, or stand-alone operation, what I use
for dirt cheap non-nanosecond timing is a TBolt-10MHz-driven
isochronous microcontroller.
tv
Hi Hal: been watching this thread with some interest. Seems to me that
the layers that the MS operating systems and bios(es) put between the
parallel port and the programs using the port could introduce a lot of
variable latency. I think there may be some available dll's that go
around the shells?
> I was thinking about the parallel port polling idea, but then my son wanted
> to measure the relation between temperature and XO frequency, so we needed
> microsecond resolution.
Why do you need microsecond resolution?
A junk XO will drift ballpark of 1 PPM per C. That's 86 ms per day or 3.6
Thank you to everyone for their thought answers and insights, they gave
me some great ideas. I was thinking about the parallel port polling idea,
but then my son wanted to measure the relation between temperature and XO
frequency, so we needed microsecond resolution.
tvb came up with just the perf
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