b...@evoria.net said:
Note: The DAC module is designed specifically for audio applications and is
not recommended for control type applications.
I had hoped that it wouldn't be a problem for driving an OCXO, but my
mistake. The datasheet also notes that the DAC has 16-bit resolution but
; Discussion of precise time and frequency
measurement time-nuts@febo.com
Cc: Tom Van Baak t...@leapsecond.com
Sent: Friday, September 12, 2014 4:29 PM
Subject: Re: [time-nuts] Help understanding an ADEV
Your intuition isn't completely wrong -- the law of averages still
applies. As you provide more
On 11 Sep 2014 04:35, Bob Stewart b...@evoria.net wrote:
I've ordered the PWM version of the PIC, and hopefully, since it's the
motor control version (as opposed to the audio version) it will have much
better noise performance.
I don't know the PIC but I would have thought chips for audio would
OOPS! CORRECTION.
I don't know the PIC but I would have thought chips for audio would be
optimised for low noise far MOOR than one for driving motors.
Ears are more sensitive to a bit of noise than motors.
I assume I have misunderstood you.
Dave
___
From: Dr. David Kirkby (Kirkby Microwave Ltd) drkir...@kirkbymicrowave.co.uk
To: Bob Stewart b...@evoria.net; Discussion of precise time and frequency
measurement time-nuts@febo.com
Sent: Saturday, September 13, 2014 4:27 PM
Subject: Re: [time-nuts] Help understanding an ADEV
On 11 Sep
this project!
Bob
From: Tom Van Baak t...@leapsecond.com
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Thursday, September 11, 2014 3:53 PM
Subject: Re: [time-nuts] Help understanding an ADEV
I've been wondering if it would
Hi
The plot pretty much confirms what you already know - there is a noise spectrum
and it’s not what you want to have. In a closed loop system, it’s all going to
add up. The big unknown is - do you get noise out of the DAC trying to correct
the OCXO’s noise or just noise out of the DAC? Is the
to
measure.
/tvb
- Original Message -
From: Bob Stewart b...@evoria.net
To: Time Nuts time-nuts@febo.com
Sent: Wednesday, September 10, 2014 8:06 PM
Subject: [time-nuts] Help understanding an ADEV
After spending a lot of effort trying to get some useful tuning figures for
the PID in my
Sent: Thursday, September 11, 2014 6:10 AM
Subject: Re: [time-nuts] Help understanding an ADEV
Hi
The plot pretty much confirms what you already know - there is a noise spectrum
and it’s not what you want to have. In a closed loop system, it’s all going to
add up. The big unknown is - do you
-nuts] Help understanding an ADEV
After spending a lot of effort trying to get some useful tuning figures for the
PID in my GPSDO engine, I decided to capture the DAC output with my 3456A.
And, of course I've made an ADEV plot. If I understand this correctly, it
means that there is mostly
I've been wondering if it would be better to look in the frequency domain.
I'll have to look at Tom's site to see if he has code to do that.
Bob
Hi Bob,
Ok, I think I found the problem with your plot. There's one mistake, one
misunderstanding, and a miscalibration.
1) It appears you're
From: Tom Van Baak t...@leapsecond.com
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Thursday, September 11, 2014 3:53 PM
Subject: Re: [time-nuts] Help understanding an ADEV
I've been wondering if it would be better to look
After spending a lot of effort trying to get some useful tuning figures for the
PID in my GPSDO engine, I decided to capture the DAC output with my 3456A.
And, of course I've made an ADEV plot. If I understand this correctly, it
means that there is mostly justnoise out to 2 tau, and an area
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