little test board Z518...

[server]

We\'re building a box that processes an arbitrary waveform from a Tek
AWG5000 box. Tek was kind enough to loan one to us for a couple weeks;
it costs over $200K. The rep was great and helped me carry it down the
stairs and bought me some bread at Tartine.

https://www.dropbox.com/s/9o4mx8vbpglsxrk/AWG_Bench.jpg?raw=1

We need a test signal for production test and won\'t use a Tek. This
little board is sort of glue logic for the test setup and makes a sort
of arbitrary waveform. And our 11801 sampling scopes need a
pretrigger.

https://www.dropbox.com/s/a445dwscj8a5j2v/99S518A_1.pdf?dl=0

Again, these little LVDS line receivers rock.



--

Father Brown\'s figure remained quite dark and still;
but in that instant he had lost his head. His head was
always most valuable when he had lost it.

 

[Rich S]

On Saturday, November 27, 2021 at 2:12:01 AM UTC, jla...@highlandsniptechnology.com wrote:

We\'re building a box that processes an arbitrary waveform from a Tek
AWG5000 box. Tek was kind enough to loan one to us for a couple weeks;


Again, these little LVDS line receivers rock.

(re-post)
Interesting, yeah, I checked their datasheet.
These SN65LVDS_ parts have many nice
features.
https://www.ti.com/product/SN65LVDS2

but you noticed they have 300K pull-up
resistors on the inputs?
(Figure 16 in the d-sheet.)
So your +2V rail may not be \"stiff\"
enough to lock it in at +2V.

cheers, RS

 

[server]

On Sat, 27 Nov 2021 20:51:24 -0800 (PST), Rich S
<richsulinengineer@gmail.com> wrote:

On Saturday, November 27, 2021 at 2:12:01 AM UTC, jla...@highlandsniptechnology.com wrote:
We\'re building a box that processes an arbitrary waveform from a Tek
AWG5000 box. Tek was kind enough to loan one to us for a couple weeks;


Again, these little LVDS line receivers rock.


(re-post)
Interesting, yeah, I checked their datasheet.
These SN65LVDS_ parts have many nice
features.
https://www.ti.com/product/SN65LVDS2

but you noticed they have 300K pull-up
resistors on the inputs?
(Figure 16 in the d-sheet.)
So your +2V rail may not be \"stiff\"
enough to lock it in at +2V.

cheers, RS

The +2 divider source impedance is around 160 ohms, so it should be
OK. But good point.

The timings don\'t need to be super precise (they won\'t be), just
fairly stable.

Most scopes are mediocre or downright terrible for measuring time from
an external trigger to a vertical channel. Most modern digital scopes
quantize an external trigger to one sampling clock interval, and add
extra drift too. The best way to measure delta-t or jitter is vertical
channel-to-channel.

A dual-channel sampling head, like an SD-24, should sample both
channels simultaneously. There is one sample pulse generator and two
traveling-wave diode signal samplers:

https://www.dropbox.com/s/kvjj8r61trk2fti/SD24_7.JPG?dl=0

So if we interface a sampling scope and external trigger and then
extract two lists of samples, we should be able to do math on that
data and get stable, super-low jitter measurement regardless of
trigger errors. I think.



--

Father Brown\'s figure remained quite dark and still;
but in that instant he had lost his head. His head was
always most valuable when he had lost it.

 

[Anthony William Sloman]

On Sunday, November 28, 2021 at 4:23:15 PM UTC+11, jla...@highlandsniptechnology.com wrote:

On Sat, 27 Nov 2021 20:51:24 -0800 (PST), Rich S
richsuli...@gmail.com> wrote:

On Saturday, November 27, 2021 at 2:12:01 AM UTC, jla...@highlandsniptechnology.com wrote:
We\'re building a box that processes an arbitrary waveform from a Tek
AWG5000 box. Tek was kind enough to loan one to us for a couple weeks;

Again, these little LVDS line receivers rock.

(re-post)
Interesting, yeah, I checked their datasheet.
These SN65LVDS_ parts have many nice
features.
https://www.ti.com/product/SN65LVDS2

but you noticed they have 300K pull-up
resistors on the inputs?
(Figure 16 in the d-sheet.)
So your +2V rail may not be \"stiff\"
enough to lock it in at +2V.

cheers, RS
The +2 divider source impedance is around 160 ohms, so it should be
OK. But good point.

The timings don\'t need to be super precise (they won\'t be), just
fairly stable.

Most scopes are mediocre or downright terrible for measuring time from
an external trigger to a vertical channel. Most modern digital scopes
quantize an external trigger to one sampling clock interval, and add
extra drift too. The best way to measure delta-t or jitter is vertical
channel-to-channel.

That sounds a bit odd. Back around 1988 we quantised our external trigger inputs to one clock edge, but also started a ramp that got stopped at the clock edge that showed up two clock periods later - we digitised where the ramp had go to and subtracted that from the clock count recorded after trigger edge had been detected.

The system was automatically recalibrated every ten minutes or so. We used an 800MHz clock, and ended up with about 60 psec jitter on the edge position.

The clock was pretty horrid, and we wouldn\'t have had a lot of trouble getting a lower jitter 800MHz clock by spending a bit of money when we had the time to start thinking about improving the system rather than getting rid of more troublesome bugs. A couple of years later I could have bought a 500MHz crystal oscillator built around an etched-back thin crystal that offered 1psec rms jitter. At the time we were thinking in terms of a SAW-based oscillator, which could have been pretty good.

A dual-channel sampling head, like an SD-24, should sample both
channels simultaneously. There is one sample pulse generator and two
traveling-wave diode signal samplers:

https://www.dropbox.com/s/kvjj8r61trk2fti/SD24_7.JPG?dl=0

So if we interface a sampling scope and external trigger and then
extract two lists of samples, we should be able to do math on that
data and get stable, super-low jitter measurement regardless of
trigger errors. I think.

Something of an overkill.

--
Bill Sloman, Sydney

 

[Cydrome Leader]

jlarkin@highlandsniptechnology.com wrote:

We\'re building a box that processes an arbitrary waveform from a Tek
AWG5000 box. Tek was kind enough to loan one to us for a couple weeks;
it costs over $200K. The rep was great and helped me carry it down the
stairs and bought me some bread at Tartine.

https://www.dropbox.com/s/9o4mx8vbpglsxrk/AWG_Bench.jpg?raw=1

What an odd looking instrument. Can you pop the hood for some photos or do
they have seals all over it? It looks like a project case with a tablet
double sided taped into the window, with a power supply keypad and
someshop made special binding posts.

Did you go looting last week?

We need a test signal for production test and won\'t use a Tek. This
little board is sort of glue logic for the test setup and makes a sort
of arbitrary waveform. And our 11801 sampling scopes need a
pretrigger.

https://www.dropbox.com/s/a445dwscj8a5j2v/99S518A_1.pdf?dl=0

Again, these little LVDS line receivers rock.

Have any of your board/designs turned up on alibaba yet?

 

[server]

On Tue, 30 Nov 2021 06:38:44 -0000 (UTC), Cydrome Leader
<presence@MUNGEpanix.com> wrote:

jlarkin@highlandsniptechnology.com wrote:
We\'re building a box that processes an arbitrary waveform from a Tek
AWG5000 box. Tek was kind enough to loan one to us for a couple weeks;
it costs over $200K. The rep was great and helped me carry it down the
stairs and bought me some bread at Tartine.

https://www.dropbox.com/s/9o4mx8vbpglsxrk/AWG_Bench.jpg?raw=1

What an odd looking instrument. Can you pop the hood for some photos or do
they have seals all over it? It looks like a project case with a tablet
double sided taped into the window, with a power supply keypad and
someshop made special binding posts.

It\'s a pretty serious rackmount instrument. It looks really well
engineered in real life. I wanted to open it up but figured it would
be imprudent, especially since Tek has been so friendly.

The back is wild:

https://www.dropbox.com/s/2pc8usssd93eevt/AWG5000_Back.jpg?raw=1

One side is all air intake and the other is all fans. It kept my
office cozy.

I was curious about the little thing on the upper-right of the front
panel, with the two big screws. It\'s a hard drive.

Did you go looting last week?

???

We need a test signal for production test and won\'t use a Tek. This
little board is sort of glue logic for the test setup and makes a sort
of arbitrary waveform. And our 11801 sampling scopes need a
pretrigger.

https://www.dropbox.com/s/a445dwscj8a5j2v/99S518A_1.pdf?dl=0

Again, these little LVDS line receivers rock.

Have any of your board/designs turned up on alibaba yet?

No. Our stuff doesn\'t copy well into low-margin, high-volume junk.



--

Father Brown\'s figure remained quite dark and still;
but in that instant he had lost his head. His head was
always most valuable when he had lost it.

 

[Phil Hobbs]

jlarkin@highlandsniptechnology.com wrote:

We\'re building a box that processes an arbitrary waveform from a Tek
AWG5000 box. Tek was kind enough to loan one to us for a couple weeks;
it costs over $200K. The rep was great and helped me carry it down the
stairs and bought me some bread at Tartine.

https://www.dropbox.com/s/9o4mx8vbpglsxrk/AWG_Bench.jpg?raw=1

We need a test signal for production test and won\'t use a Tek. This
little board is sort of glue logic for the test setup and makes a sort
of arbitrary waveform. And our 11801 sampling scopes need a
pretrigger.

https://www.dropbox.com/s/a445dwscj8a5j2v/99S518A_1.pdf?dl=0

Again, these little LVDS line receivers rock.

Looks like J7 is wired up wrong, no?

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com

 

[Cydrome Leader]

jlarkin@highlandsniptechnology.com wrote:

On Tue, 30 Nov 2021 06:38:44 -0000 (UTC), Cydrome Leader
presence@MUNGEpanix.com> wrote:

jlarkin@highlandsniptechnology.com wrote:
We\'re building a box that processes an arbitrary waveform from a Tek
AWG5000 box. Tek was kind enough to loan one to us for a couple weeks;
it costs over $200K. The rep was great and helped me carry it down the
stairs and bought me some bread at Tartine.

https://www.dropbox.com/s/9o4mx8vbpglsxrk/AWG_Bench.jpg?raw=1

What an odd looking instrument. Can you pop the hood for some photos or do
they have seals all over it? It looks like a project case with a tablet
double sided taped into the window, with a power supply keypad and
someshop made special binding posts.

It\'s a pretty serious rackmount instrument. It looks really well
engineered in real life. I wanted to open it up but figured it would
be imprudent, especially since Tek has been so friendly.

The back is wild:

https://www.dropbox.com/s/2pc8usssd93eevt/AWG5000_Back.jpg?raw=1

One side is all air intake and the other is all fans. It kept my
office cozy.

I was curious about the little thing on the upper-right of the front
panel, with the two big screws. It\'s a hard drive.

Wow, yeah, the back is where the action is. I\'m trying to figure out how
the \'puter board is installed in there so close to the power supply. The
VGA out and eSATA are a knock out combination.

Did you go looting last week?

???

Everything is free in SF these days, I saw it on TV. Looks like some sort
of smash, grab \'n go type holiday sale.

We need a test signal for production test and won\'t use a Tek. This
little board is sort of glue logic for the test setup and makes a sort
of arbitrary waveform. And our 11801 sampling scopes need a
pretrigger.

https://www.dropbox.com/s/a445dwscj8a5j2v/99S518A_1.pdf?dl=0

Again, these little LVDS line receivers rock.

Have any of your board/designs turned up on alibaba yet?

No. Our stuff doesn\'t copy well into low-margin, high-volume junk.

Do you ever post intentionally broken schematics on the internet, for fun?

 

[server]

On Tue, 30 Nov 2021 19:01:34 -0500, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

jlarkin@highlandsniptechnology.com wrote:
We\'re building a box that processes an arbitrary waveform from a Tek
AWG5000 box. Tek was kind enough to loan one to us for a couple weeks;
it costs over $200K. The rep was great and helped me carry it down the
stairs and bought me some bread at Tartine.

https://www.dropbox.com/s/9o4mx8vbpglsxrk/AWG_Bench.jpg?raw=1

We need a test signal for production test and won\'t use a Tek. This
little board is sort of glue logic for the test setup and makes a sort
of arbitrary waveform. And our 11801 sampling scopes need a
pretrigger.

https://www.dropbox.com/s/a445dwscj8a5j2v/99S518A_1.pdf?dl=0

Again, these little LVDS line receivers rock.




Looks like J7 is wired up wrong, no?

Cheers

Phil Hobbs

Good point. We should ground both lower pins. The Brat did this from
my very rough sketch.

The barrel will ground through the box... when it\'s in the box.



--

Father Brown\'s figure remained quite dark and still;
but in that instant he had lost his head. His head was
always most valuable when he had lost it.

 

[Phil Hobbs]

jlarkin@highlandsniptechnology.com wrote:

On Tue, 30 Nov 2021 19:01:34 -0500, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

jlarkin@highlandsniptechnology.com wrote:
We\'re building a box that processes an arbitrary waveform from a Tek
AWG5000 box. Tek was kind enough to loan one to us for a couple weeks;
it costs over $200K. The rep was great and helped me carry it down the
stairs and bought me some bread at Tartine.

https://www.dropbox.com/s/9o4mx8vbpglsxrk/AWG_Bench.jpg?raw=1

We need a test signal for production test and won\'t use a Tek. This
little board is sort of glue logic for the test setup and makes a sort
of arbitrary waveform. And our 11801 sampling scopes need a
pretrigger.

https://www.dropbox.com/s/a445dwscj8a5j2v/99S518A_1.pdf?dl=0

Again, these little LVDS line receivers rock.




Looks like J7 is wired up wrong, no?


Good point. We should ground both lower pins. The Brat did this from
my very rough sketch.

The barrel will ground through the box... when it\'s in the box.

That one has bitten us too. Fortunately the rework is easy and
invisible.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com

 

[server]

On Wed, 1 Dec 2021 01:25:36 -0500, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

jlarkin@highlandsniptechnology.com wrote:
On Tue, 30 Nov 2021 19:01:34 -0500, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

jlarkin@highlandsniptechnology.com wrote:
We\'re building a box that processes an arbitrary waveform from a Tek
AWG5000 box. Tek was kind enough to loan one to us for a couple weeks;
it costs over $200K. The rep was great and helped me carry it down the
stairs and bought me some bread at Tartine.

https://www.dropbox.com/s/9o4mx8vbpglsxrk/AWG_Bench.jpg?raw=1

We need a test signal for production test and won\'t use a Tek. This
little board is sort of glue logic for the test setup and makes a sort
of arbitrary waveform. And our 11801 sampling scopes need a
pretrigger.

https://www.dropbox.com/s/a445dwscj8a5j2v/99S518A_1.pdf?dl=0

Again, these little LVDS line receivers rock.




Looks like J7 is wired up wrong, no?


Good point. We should ground both lower pins. The Brat did this from
my very rough sketch.

The barrel will ground through the box... when it\'s in the box.

That one has bitten us too. Fortunately the rework is easy and
invisible.

Cheers

Phil Hobbs

The hardware equivalent of \"it\'s just a test and a branch.\"



--

Father Brown\'s figure remained quite dark and still;
but in that instant he had lost his head. His head was
always most valuable when he had lost it.

 

[John Doe]

Cydrome Leader wrote:

jlarkin@highlandsniptechnology.com wrote:
Cydrome Leader wrote:

Have any of your board/designs turned up on alibaba yet?

No. Our stuff doesn\'t copy well into low-margin, high-volume junk.

Do you ever post intentionally broken schematics on the internet, for fun?

The meaning of that stuff is so obvious, and makes my stomach turn.

Why something isn\'t being done about it...

 

[Edward Hernandez]

The John Doe troll stated the following in message-id
<sdhn7c$pkp$4@dont-email.me>:

> The troll doesn\'t even know how to format a USENET post...

And the John Doe troll stated the following in message-id
<sg3kr7$qt5$1@dont-email.me>:

The reason Bozo cannot figure out how to get Google to keep from
breaking its lines in inappropriate places is because Bozo is
CLUELESS...

And yet, the clueless John Doe troll has itself posted yet another
incorrectly formatted USENET posting on Wed, 1 Dec 2021 15:40:30 -0000
(UTC) in message-id <so851d$hk4$9@dont-email.me>.

This posting is a public service announcement for any google groups
readers who happen by to point out that the John Doe troll does not even
follow it\'s own rules that it uses to troll other posters.

VIdotl6l8rbq

 

[Edward Hernandez]

The John Doe troll stated the following in message-id
<sdhn7c$pkp$4@dont-email.me>:

> The troll doesn\'t even know how to format a USENET post...

And the John Doe troll stated the following in message-id
<sg3kr7$qt5$1@dont-email.me>:

The reason Bozo cannot figure out how to get Google to keep from
breaking its lines in inappropriate places is because Bozo is
CLUELESS...

And yet, the clueless John Doe troll has itself posted yet another
incorrectly formatted USENET posting on Thu, 2 Dec 2021 05:01:11 -0000
(UTC) in message-id <so9jum$ve9$2@dont-email.me>.

This posting is a public service announcement for any google groups
readers who happen by to point out that the John Doe troll does not even
follow it\'s own rules that it uses to troll other posters.

GPnMA84bw4R9

 

[John Larkin]

On Thu, 02 Dec 2021 11:06:15 GMT, Edward Hernandez
<dtgamer99@gmail.com> wrote:

The John Doe troll stated the following in message-id
sdhn7c$pkp$4@dont-email.me>:

The troll doesn\'t even know how to format a USENET post...

And the John Doe troll stated the following in message-id
sg3kr7$qt5$1@dont-email.me>:

The reason Bozo cannot figure out how to get Google to keep from
breaking its lines in inappropriate places is because Bozo is
CLUELESS...

And yet, the clueless John Doe troll has itself posted yet another
incorrectly formatted USENET posting on Thu, 2 Dec 2021 05:01:11 -0000
(UTC) in message-id <so9jum$ve9$2@dont-email.me>.

This posting is a public service announcement for any google groups
readers who happen by to point out that the John Doe troll does not even
follow it\'s own rules that it uses to troll other posters.

GPnMA84bw4R9

Why don\'t you old hens take your ritual clucking somewhere else?

Buy a battery and some LEDs and learn something.

--

If a man will begin with certainties, he shall end with doubts,
but if he will be content to begin with doubts he shall end in certainties.
Francis Bacon

 

[server]

John Larkin <jlarkin@highland_atwork_technology.com> wrote in
news:685iqgt49q8j45dbmcneop6s4sekh08lb8@4ax.com:

On Thu, 02 Dec 2021 11:06:15 GMT, Edward Hernandez
dtgamer99@gmail.com> wrote:

The John Doe troll stated the following in message-id
sdhn7c$pkp$4@dont-email.me>:

The troll doesn\'t even know how to format a USENET post...

And the John Doe troll stated the following in message-id
sg3kr7$qt5$1@dont-email.me>:

The reason Bozo cannot figure out how to get Google to keep from
breaking its lines in inappropriate places is because Bozo is
CLUELESS...

And yet, the clueless John Doe troll has itself posted yet another
incorrectly formatted USENET posting on Thu, 2 Dec 2021 05:01:11
-0000 (UTC) in message-id <so9jum$ve9$2@dont-email.me>.

This posting is a public service announcement for any google
groups readers who happen by to point out that the John Doe troll
does not even follow it\'s own rules that it uses to troll other
posters.

GPnMA84bw4R9

Why don\'t you old hens take your ritual clucking somewhere else?

Buy a battery and some LEDs and learn something.

The idiot John Doe has never left upon request either, much less
changed his pathetic behavior. The idiot he got into a wussy boy
fight with in another group who now invades our group with his
pathetic repeats of the DoeTard\'s stupid behavior makes one wish that
flinging lead around would be OK, not just in Texas. Cause I would
surely feed Doe Boy some lead wheaties for breakfast. And his new
dipshit repost dumbfuck I would bury up to his neck like the chickens
in that movie... And have a single action turkey shoot with his head
at about 40 yards so that it could provide entertainment for a bit
until someone finally hits the mark. Old pistols are hard to zero in
at 40 yards. I\'d have him by the third shot from a cold bore.
Probably get him from the hip easily too, just not at 40 yards and
only the head to shoot at. He\'s probably fatter than DoeWuss is.

Old hens? No... They are jackasses who cannot go a single day
without ignoring everyone around them in a forum just so they can
spout their little back and forth fuss, forcing the use of filters
and the posting of opinions about his stupid bahaviors.

They really do need lead for the head.

Maybe one day we will have generations of men whom are not immature
little pusifed jackasses.