Re: [time-nuts] ACAM GP22 Chip

time and frequency measurement Subject: Re: [time-nuts] ACAM GP22 Chip I wouldn't expect the noise to be in the ns range, but i wouldn't surprised if it was a few 10ps. I have never done any measurements though, and I don't think i've ever seen any jitter measurements for 32kHz oscillators, so

Re: [time-nuts] ACAM GP22 Chip

ject: Re: [time-nuts] ACAM GP22 Chip In order to evaluate the chip I was planning to replicate John A’s experiment with the coaxial delay line from the HP5370b For those wondering: "John A" is John Ackermann and the experiment in question is documented at http://www.febo.com/pages/hp

Re: [time-nuts] ACAM GP22 Chip

be in a positions to > share "early" findings. > > Best regards, > Thomas. > > > > -Original Message- From: Tom Van Baak > Sent: Thursday, November 26, 2015 12:02 AM > To: Discussion of precise time and frequency measurement > Subject:

Re: [time-nuts] ACAM GP22 Chip

N'abend On Wed, 25 Nov 2015 14:19:37 - "Thomas Allgeier" wrote: > You guessed my origin right from my name. > > It is not that I don't trust ACAM (we are one of their customers) but from > the source I am measuring I get a lot of what you guys probably call jitter.

Re: [time-nuts] ACAM GP22 Chip

On Wed, 25 Nov 2015 14:19:37 - "Thomas Allgeier" wrote: > It is not that I don't trust ACAM (we are one of their customers) but from > the source I am measuring I get a lot of what you guys probably call jitter. > So I want to be sure the jitter comes from the

Re: [time-nuts] ACAM GP22 Chip

railway waggons) but the AoE book > as suggested by Hal should set me straight. > > Thanks again, > Thomas. > - Original Message - From: "Bob Camp" <kb...@n1k.org> > To: "Discussion of precise time and frequency measurement" > <time-nuts@fe

Re: [time-nuts] ACAM GP22 Chip

I don't want to muddy the water too much, but I'd second going all-digital, along the lines of what Bob L. recommended earlier. It seems like you just need to make some specific delay times, so various logic counting or shifting circuits should be just fine - and well-defined and understood.

Re: [time-nuts] ACAM GP22 Chip

On Wed, 25 Nov 2015 12:35:44 -0800 Hal Murray wrote: > If you poke around on the web you can probably find a graph of frequency vs > temperature, maybe even for that particular vendor/model of crystal if you > can read the label. Beware: the graph for a 32 KHz crystal

Re: [time-nuts] ACAM GP22 Chip

>> In order to evaluate the chip I was planning to replicate John A’s >> experiment with the coaxial delay line from the HP5370b > For those wondering: "John A" is John Ackermann and the experiment > in question is documented at http://www.febo.com/pages/hp5370b/ Maybe I misunderstand, but I

Re: [time-nuts] ACAM GP22 Chip

>I wouldn't expect the noise to >be in the ns range, but i wouldn't surprised if it was a few 10ps. >I have never done any measurements though, and I don't think i've >ever seen any jitter measurements for 32kHz oscillators, so take >this value as rough guestimate. On the GP21 board I used it

Re: [time-nuts] ACAM GP22 Chip

Hi Thomas, Another option for generating a range of delays would be to use a stable oscillator like an ovenised one. This is actually similar to what the GP22 does for measuring on mode2. If you gate the output of the oscillator you can get a start and stops at 1us or 70us or whatever. It's

Re: [time-nuts] ACAM GP22 Chip

Subject: Re: [time-nuts] ACAM GP22 Chip On Tue, 24 Nov 2015 11:44:04 -0800 Hal Murray <hmur...@megapathdsl.net> wrote: > th.allge...@gmail.com said: > > I should say from the start that I am new to time and frequency > > measurements and not even an electronics engineer –

Re: [time-nuts] ACAM GP22 Chip

. Kind regards, Thomas. - Original Message - From: "Hal Murray" <hmur...@megapathdsl.net> To: "Discussion of precise time and frequency measurement" <time-nuts@febo.com> Cc: <hmur...@megapathdsl.net> Sent: Tuesday, November 24, 2015 7:44 PM S

Re: [time-nuts] ACAM GP22 Chip

2015 11:24 PM Subject: Re: [time-nuts] ACAM GP22 Chip Hi If you head down to your local big box store, they will happily sell you a thousand foot spool of RG-6 coax for next to nothing. If their prices are still to high, the auction sites will sell it for even less. It has a 75 ohm impedanc

Re: [time-nuts] ACAM GP22 Chip

th.allge...@gmail.com said: > Absolute accuracy is not the problem here, unless the 32768 Hz clock on the > eval board actually drifts. ... It will drift with temperature. Not much, but this is time-nuts. Coax or R-C delay lines will probably drift more. If you poke around on the web you can

Re: [time-nuts] ACAM GP22 Chip

ks, Thomas. - Original Message - From: "Attila Kinali" <att...@kinali.ch> To: "Discussion of precise time and frequency measurement" <time-nuts@febo.com> Sent: Tuesday, November 24, 2015 4:56 PM Subject: Re: [time-nuts] ACAM GP22 Chip Moin, On Tue, 2

Re: [time-nuts] ACAM GP22 Chip

frequency measurement" <time-nuts@febo.com> Sent: Tuesday, November 24, 2015 3:17 PM Subject: Re: [time-nuts] ACAM GP22 Chip Thomas Welcome to the group. I am sure others will comment. Many of us have a very wide range of experience and expertise so you should feel comfortable with

Re: [time-nuts] ACAM GP22 Chip

: "Robert LaJeunesse" <lajeune...@mail.com> To: <time-nuts@febo.com> Sent: Tuesday, November 24, 2015 6:25 PM Subject: Re: [time-nuts] ACAM GP22 Chip If the goal is to create two signals consistently spaced near 70us apart why not use a good, fast 8-bit serial-in, parallel out sh

Re: [time-nuts] ACAM GP22 Chip

On Tue, 24 Nov 2015 11:44:04 -0800 Hal Murray wrote: > th.allge...@gmail.com said: > > I should say from the start that I am new to time and frequency measurements > > and not even an electronics engineer – but then I have been exposed to > > high-precision electronics

Re: [time-nuts] ACAM GP22 Chip

Hi If you head down to your local big box store, they will happily sell you a thousand foot spool of RG-6 coax for next to nothing. If their prices are still to high, the auction sites will sell it for even less. It has a 75 ohm impedance and a bandwidth of several GHz. The rather convent

Re: [time-nuts] ACAM GP22 Chip

but their differences. Bob LaJeunesse > Sent: Tuesday, November 24, 2015 at 9:04 AM > From: "Thomas Allgeier" <th.allge...@gmail.com> > To: time-nuts@febo.com > Subject: [time-nuts] ACAM GP22 Chip > > Hello, > > I have an ACAM GP22 TDC chip and evaluation

Re: [time-nuts] ACAM GP22 Chip

th.allge...@gmail.com said: > I should say from the start that I am new to time and frequency measurements > and not even an electronics engineer – but then I have been exposed to > high-precision electronics for the last 25 years hence have picked up some > dangerous degree of half-knowledge.

Re: [time-nuts] ACAM GP22 Chip

Moin, On Tue, 24 Nov 2015 14:04:32 - "Thomas Allgeier" wrote: > We want to use this chip to measure the period of a square wave, of > around 13 kHz i.e. in the 70 µs range. As the application is potentially > high-accuracy we need to know the period to within 1 ns or

[time-nuts] ACAM GP22 Chip

Hello, I have an ACAM GP22 TDC chip and evaluation board which I am looking at for “work” purposes – I work for a company active in the weighing and force measurement world. I should say from the start that I am new to time and frequency measurements and not even an electronics engineer –

Re: [time-nuts] ACAM GP22 Chip

Thomas Welcome to the group. I am sure others will comment. Many of us have a very wide range of experience and expertise so you should feel comfortable with any question. To the coax delay question. You are not pushing the limits. But its important to understand the impacts of such long lines.

Re: [time-nuts] ACAM GP22 Chip

my 2 cents: 1) hack a RC delay + comparator (isolate well the R and C for temp variations) 2) use a proper delay line (can be bought at digikey/mouser/etc) Daniel Em 24/11/2015 12:04, Thomas Allgeier escreveu: Hello, I have an ACAM GP22 TDC chip and evaluation board which I am looking