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https://www.amazon.com/gp/aw/d/B0CGHTLRHS/
That's crazy. 4 channels at 12 bits and 250 MHz, built-in sig gen and
logic analyzer, $764 overnight with free shipping.
I remember when a 30 MHz dual channel scope cost more than a
Chevrolet.
The fad in test equipment is black this year. Ugly.
https://www.amazon.com/gp/aw/d/B0CGHTLRHS/
That's crazy. 4 channels at 12 bits and 250 MHz, built-in sig gen and
logic analyzer, $764 overnight with free shipping.
I remember when a 30 MHz dual channel scope cost more than a
Chevrolet.
The fad in test equipment is black this year. Ugly.
On 8/12/25 3:33 PM, john larkin wrote:
https://www.amazon.com/gp/aw/d/B0CGHTLRHS/
That's crazy. 4 channels at 12 bits and 250 MHz, built-in sig gen and
logic analyzer, $764 overnight with free shipping.
I remember when a 30 MHz dual channel scope cost more than a
Chevrolet.
The fad in test equipment is black this year. Ugly.
And it has x-y mode :-). The DHO914 has half the analog BW but still
125 MHz and doesn't have the AWG, but it's only US$560. Website is: https://www.rigolna.com/products/rigol-digital-oscilloscopes/dho900/ and
if you get the datasheet it (finally) says it does x-y (x = ch 1, y = ch
2) on page 9. Only 10.5" x 6.4" x 3.0 ", screen is 7" diagonal and does 1024 x 600. Wonder if that's small enough to tempt Liz? :-)
john larkin <jl@glen--canyon.com> wrote:
https://www.amazon.com/gp/aw/d/B0CGHTLRHS/
That's crazy. 4 channels at 12 bits and 250 MHz, built-in sig gen and
logic analyzer, $764 overnight with free shipping.
I remember when a 30 MHz dual channel scope cost more than a
Chevrolet.
The fad in test equipment is black this year. Ugly.
Very nice scope. I have 2 at home (electronic and programming desk, separate >at opposite ends of the room) -- I work 100% from home -- and we purchased a >whole bunch of those for a company to use as everyday scope. We have a 50GHz >Tektronix in its dedicated room for signal integrity and other high
frequency testing but those DHO924S ones are on every desk now.
I really like it, even put my beloved Tek 2467B that I used before for
almost everything on a far shelf and never used it ever since. Have a
monster 4GHz 40Gsps LeCroy WR640Zi with all options on my electronic desk
too but don't remember where I powered it up last time -- it is 8-bit, >extremely complex, makes noise like a jet at takeoff so it is only used when >that bandwidth and those advanced options are really needed that is
extremely rare.
DHO924S covers almost everything. Logic Analyzer is pretty basic but >sufficient for almost everything so my another jet sounding monster, HP >16702B, also gathers dust now.
Very happy with it, would recommend to everybody.
---
******************************************************************
* KSI@home KOI8 Net < > The impossible we do immediately. *
* Las Vegas NV, USA < > Miracles require 24-hour notice. * >******************************************************************
On 8/12/25 3:33 PM, john larkin wrote:
https://www.amazon.com/gp/aw/d/B0CGHTLRHS/
That's crazy. 4 channels at 12 bits and 250 MHz, built-in sig gen and
logic analyzer, $764 overnight with free shipping.
I remember when a 30 MHz dual channel scope cost more than a
Chevrolet.
The fad in test equipment is black this year. Ugly.
And it has x-y mode :-). The DHO914 has half the analog BW but still
125 MHz and doesn't have the AWG, but it's only US$560. Website is: https://www.rigolna.com/products/rigol-digital-oscilloscopes/dho900/ and
if you get the datasheet it (finally) says it does x-y (x = ch 1, y = ch
2) on page 9. Only 10.5" x 6.4" x 3.0 ", screen is 7" diagonal and does
1024 x 600. Wonder if that's small enough to tempt Liz? :-)
Carl <carl.ijamesXX@YYverizon.net> wrote:
On 8/12/25 3:33 PM, john larkin wrote:
https://www.amazon.com/gp/aw/d/B0CGHTLRHS/
That's crazy. 4 channels at 12 bits and 250 MHz, built-in sig gen and
logic analyzer, $764 overnight with free shipping.
I remember when a 30 MHz dual channel scope cost more than a
Chevrolet.
The fad in test equipment is black this year. Ugly.
And it has x-y mode :-). The DHO914 has half the analog BW but still
125 MHz and doesn't have the AWG, but it's only US$560. Website is:
https://www.rigolna.com/products/rigol-digital-oscilloscopes/dho900/ and
if you get the datasheet it (finally) says it does x-y (x = ch 1, y = ch
2) on page 9. Only 10.5" x 6.4" x 3.0 ", screen is 7" diagonal and does
1024 x 600. Wonder if that's small enough to tempt Liz? :-)
Sadly that is about twice the size I could fit into the equipment.
On Tue, 12 Aug 2025 21:14:55 -0000 (UTC), Sergey Kubushyn
<ksi@koi8.net> wrote:
john larkin <jl@glen--canyon.com> wrote:
https://www.amazon.com/gp/aw/d/B0CGHTLRHS/
That's crazy. 4 channels at 12 bits and 250 MHz, built-in sig gen and
logic analyzer, $764 overnight with free shipping.
I remember when a 30 MHz dual channel scope cost more than a
Chevrolet.
The fad in test equipment is black this year. Ugly.
Very nice scope. I have 2 at home (electronic and programming desk, separate >> at opposite ends of the room) -- I work 100% from home -- and we purchased a >> whole bunch of those for a company to use as everyday scope. We have a 50GHz >> Tektronix in its dedicated room for signal integrity and other high
frequency testing but those DHO924S ones are on every desk now.
I really like it, even put my beloved Tek 2467B that I used before for
almost everything on a far shelf and never used it ever since. Have a
monster 4GHz 40Gsps LeCroy WR640Zi with all options on my electronic desk
too but don't remember where I powered it up last time -- it is 8-bit,
extremely complex, makes noise like a jet at takeoff so it is only used when >> that bandwidth and those advanced options are really needed that is
extremely rare.
We have a 7 GHz LeCroy that nobody uses. The menus make no sense and
even LeCroy doesn't understand them.
DHO924S covers almost everything. Logic Analyzer is pretty basic but
sufficient for almost everything so my another jet sounding monster, HP
16702B, also gathers dust now.
Very happy with it, would recommend to everybody.
---
******************************************************************
* KSI@home KOI8 Net < > The impossible we do immediately. *
* Las Vegas NV, USA < > Miracles require 24-hour notice. *
******************************************************************
We have maybe 20 of various Rigol scopes and I don't think any of them
has ever broken.
We do have one Tek scope with galvanically isolated inputs and
trigger. That can be very handy.
On 13/08/2025 04:17, john larkin wrote:
On Tue, 12 Aug 2025 21:14:55 -0000 (UTC), Sergey KubushynI have the HDO1074, hacked to 250MHz and a Siglent 100MHz scope, hacked
<ksi@koi8.net> wrote:
john larkin <jl@glen--canyon.com> wrote:
https://www.amazon.com/gp/aw/d/B0CGHTLRHS/
That's crazy. 4 channels at 12 bits and 250 MHz, built-in sig gen and
logic analyzer, $764 overnight with free shipping.
I remember when a 30 MHz dual channel scope cost more than a
Chevrolet.
The fad in test equipment is black this year. Ugly.
Very nice scope. I have 2 at home (electronic and programming desk, separate
at opposite ends of the room) -- I work 100% from home -- and we purchased a
whole bunch of those for a company to use as everyday scope. We have a 50GHz
Tektronix in its dedicated room for signal integrity and other high
frequency testing but those DHO924S ones are on every desk now.
I really like it, even put my beloved Tek 2467B that I used before for
almost everything on a far shelf and never used it ever since. Have a
monster 4GHz 40Gsps LeCroy WR640Zi with all options on my electronic desk >>> too but don't remember where I powered it up last time -- it is 8-bit,
extremely complex, makes noise like a jet at takeoff so it is only used when
that bandwidth and those advanced options are really needed that is
extremely rare.
We have a 7 GHz LeCroy that nobody uses. The menus make no sense and
even LeCroy doesn't understand them.
DHO924S covers almost everything. Logic Analyzer is pretty basic but
sufficient for almost everything so my another jet sounding monster, HP
16702B, also gathers dust now.
Very happy with it, would recommend to everybody.
---
******************************************************************
* KSI@home KOI8 Net < > The impossible we do immediately. *
* Las Vegas NV, USA < > Miracles require 24-hour notice. *
******************************************************************
We have maybe 20 of various Rigol scopes and I don't think any of them
has ever broken.
We do have one Tek scope with galvanically isolated inputs and
trigger. That can be very handy.
to 750MHz. Never uses the Old tek scope any more.
Last week I discovered the first failure of any scope I ever had, the >Siglent behaved funny, non liniear input behaviour. Turned out I was >careless, in an earlier test with conducted immunity, I had monitoring >directly on the scope input and fried the channel. Now I have a 3
channel scope, repair is almost the same price as a new one :-(
Carl <carl.ijamesXX@YYverizon.net> wrote:
On 8/12/25 3:33 PM, john larkin wrote:
https://www.amazon.com/gp/aw/d/B0CGHTLRHS/
That's crazy. 4 channels at 12 bits and 250 MHz, built-in sig gen and
logic analyzer, $764 overnight with free shipping.
I remember when a 30 MHz dual channel scope cost more than a
Chevrolet.
The fad in test equipment is black this year. Ugly.
And it has x-y mode :-). The DHO914 has half the analog BW but still
125 MHz and doesn't have the AWG, but it's only US$560. Website is:
https://www.rigolna.com/products/rigol-digital-oscilloscopes/dho900/ and >> if you get the datasheet it (finally) says it does x-y (x = ch 1, y = ch >> 2) on page 9. Only 10.5" x 6.4" x 3.0 ", screen is 7" diagonal and does >> 1024 x 600. Wonder if that's small enough to tempt Liz? :-)
Sadly that is about twice the size I could fit into the equipment.
What are you doing?
Using a stereo cartridge; left on one - and right on the other channel?
Then analog CRT scope and screen rotated 45 degrees to see needle position and movement? Just a few lines of asm and a cheap LCD would do.
But digitizing (use a decent PC audio card), possibly preceded by a non linear (log) amp to also catch big track damages, maybe later expand
before display and then playback in slow motion with mplayer, stop - move back and forward around the bad point on the disc.
I remember starting with 'His Masters Voice' 78 rpm records in the fifties,
Jan Panteltje <alien@comet.invalid> wrote:
Carl <carl.ijamesXX@YYverizon.net> wrote:
On 8/12/25 3:33 PM, john larkin wrote:
https://www.amazon.com/gp/aw/d/B0CGHTLRHS/
That's crazy. 4 channels at 12 bits and 250 MHz, built-in sig gen and >> >> > logic analyzer, $764 overnight with free shipping.
I remember when a 30 MHz dual channel scope cost more than a
Chevrolet.
The fad in test equipment is black this year. Ugly.
And it has x-y mode :-). The DHO914 has half the analog BW but still
125 MHz and doesn't have the AWG, but it's only US$560. Website is:
https://www.rigolna.com/products/rigol-digital-oscilloscopes/dho900/ and >> >> if you get the datasheet it (finally) says it does x-y (x = ch 1, y = ch >> >> 2) on page 9. Only 10.5" x 6.4" x 3.0 ", screen is 7" diagonal and does >> >> 1024 x 600. Wonder if that's small enough to tempt Liz? :-)
Sadly that is about twice the size I could fit into the equipment.
What are you doing?
Using a stereo cartridge; left on one - and right on the other channel?
...and matrixing them to give vertical and horizontal vectors. That way
the 'scope picture actually represents the movement of the stylus and
allows objective correction of errors in the playback geometry. I am >particularly interested in the vector angle at which transient
high-speed phenomena occur (crackle). The angles and patterns tell me
how to select the right stylus and adjust the playback azimuth.
Then analog CRT scope and screen rotated 45 degrees to see needle position >> and movement? Just a few lines of asm and a cheap LCD would do.
No need for rotation but an analogue 'scope needs a modification to
prevent screen-burn.
I have been using a suitably-modified one for the
last 30 years and the display shows everything I need to know. A cheap >digital 'scope has proved that it is not adequate. At lower sampling
rates a cheap digital scope shows the crackles as a row of widely-spaced
dots but a faster sampling rate seems to work in batches, so the dots
join up but it misses some of the phenomena completely.
Perhaps it is possible to play around with the settings and get some >improvement but the instruction sheet is not helpful.
But digitizing (use a decent PC audio card), possibly preceded by a non
linear (log) amp to also catch big track damages, maybe later expand
before display and then playback in slow motion with mplayer, stop - move
back and forward around the bad point on the disc.
This is portable equipment for use in real time in front of an audience
(or the owner of the records).
[...]
I remember starting with 'His Masters Voice' 78 rpm records in the fifties,
I have 15.000 or more 78s and access to many more in other collections.
There arelots of different speeds, groove-shapes and recording >characteristics, this player has to cope with them all. The HMVs of the >1930s are the worst for crackle, they didn't grind the abrasive filler >properly.
Jan Panteltje <alien@comet.invalid> wrote:
Carl <carl.ijamesXX@YYverizon.net> wrote:
On 8/12/25 3:33 PM, john larkin wrote:
https://www.amazon.com/gp/aw/d/B0CGHTLRHS/
That's crazy. 4 channels at 12 bits and 250 MHz, built-in sig gen and >> >> > logic analyzer, $764 overnight with free shipping.
I remember when a 30 MHz dual channel scope cost more than a
Chevrolet.
The fad in test equipment is black this year. Ugly.
And it has x-y mode :-). The DHO914 has half the analog BW but still
125 MHz and doesn't have the AWG, but it's only US$560. Website is:
https://www.rigolna.com/products/rigol-digital-oscilloscopes/dho900/ and >> >> if you get the datasheet it (finally) says it does x-y (x = ch 1, y = ch >> >> 2) on page 9. Only 10.5" x 6.4" x 3.0 ", screen is 7" diagonal and does >> >> 1024 x 600. Wonder if that's small enough to tempt Liz? :-)
Sadly that is about twice the size I could fit into the equipment.
What are you doing?
Using a stereo cartridge; left on one - and right on the other channel?
...and matrixing them to give vertical and horizontal vectors. That way
the 'scope picture actually represents the movement of the stylus and
allows objective correction of errors in the playback geometry. I am particularly interested in the vector angle at which transient
high-speed phenomena occur (crackle). The angles and patterns tell me
how to select the right stylus and adjust the playback azimuth.
Then analog CRT scope and screen rotated 45 degrees to see needle position >> and movement? Just a few lines of asm and a cheap LCD would do.
No need for rotation but an analogue 'scope needs a modification to
prevent screen-burn. I have been using a suitably-modified one for the
last 30 years and the display shows everthing I need to know. A cheap digital 'scope has proved that it is not adequate. At lower sampling
rates a cheap digital scope shows the crackles as a row of widely-spaced
dots but a faster sampling rate seems to work in batches, so the dots
join up but it misses some of the phenomena completely.
Perhaps it is possible to play around with the settings and get some improvement but the instruction sheet is not helpful.
But digitizing (use a decent PC audio card), possibly preceded by a non
linear (log) amp to also catch big track damages, maybe later expand
before display and then playback in slow motion with mplayer, stop - move
back and forward around the bad point on the disc.
This is portable equipment for use in real time in front of an audience
(or the owner of the records).
[...]
I remember starting with 'His Masters Voice' 78 rpm records in the fifties,
I have 15.000 or more 78s and access to many more in other collections.
There arelots of different speeds, groove-shapes and recording characteristics, this player has to cope with them all. The HMVs of the 1930s are the worst for crackle, they didn't grind the abrasive filler properly.
--
~ Liz Tuddenham ~
(Remove the ".invalid"s and add ".co.uk" to reply)
www.poppyrecords.co.uk
On Thu, 14 Aug 2025 02:11:26 +0200, Klaus Kragelund
<klauskvik@hotmail.com> wrote:
On 13/08/2025 04:17, john larkin wrote:
On Tue, 12 Aug 2025 21:14:55 -0000 (UTC), Sergey KubushynI have the HDO1074, hacked to 250MHz and a Siglent 100MHz scope, hacked
<ksi@koi8.net> wrote:
john larkin <jl@glen--canyon.com> wrote:
https://www.amazon.com/gp/aw/d/B0CGHTLRHS/
That's crazy. 4 channels at 12 bits and 250 MHz, built-in sig gen and >>>>> logic analyzer, $764 overnight with free shipping.
I remember when a 30 MHz dual channel scope cost more than a
Chevrolet.
The fad in test equipment is black this year. Ugly.
Very nice scope. I have 2 at home (electronic and programming desk, separate
at opposite ends of the room) -- I work 100% from home -- and we purchased a
whole bunch of those for a company to use as everyday scope. We have a 50GHz
Tektronix in its dedicated room for signal integrity and other high
frequency testing but those DHO924S ones are on every desk now.
I really like it, even put my beloved Tek 2467B that I used before for >>>> almost everything on a far shelf and never used it ever since. Have a
monster 4GHz 40Gsps LeCroy WR640Zi with all options on my electronic desk >>>> too but don't remember where I powered it up last time -- it is 8-bit, >>>> extremely complex, makes noise like a jet at takeoff so it is only used when
that bandwidth and those advanced options are really needed that is
extremely rare.
We have a 7 GHz LeCroy that nobody uses. The menus make no sense and
even LeCroy doesn't understand them.
DHO924S covers almost everything. Logic Analyzer is pretty basic but
sufficient for almost everything so my another jet sounding monster, HP >>>> 16702B, also gathers dust now.
Very happy with it, would recommend to everybody.
---
******************************************************************
* KSI@home KOI8 Net < > The impossible we do immediately. *
* Las Vegas NV, USA < > Miracles require 24-hour notice. *
******************************************************************
We have maybe 20 of various Rigol scopes and I don't think any of them
has ever broken.
We do have one Tek scope with galvanically isolated inputs and
trigger. That can be very handy.
to 750MHz. Never uses the Old tek scope any more.
My bench scope is a 350 MHz Rigol hacked to 500. We bought four and
they threw in the upgrade. But 750/100 is an outrageous ratio.
Last week I discovered the first failure of any scope I ever had, the
Siglent behaved funny, non liniear input behaviour. Turned out I was
careless, in an earlier test with conducted immunity, I had monitoring
directly on the scope input and fried the channel. Now I have a 3
channel scope, repair is almost the same price as a new one :-(
One thing I've noticed about digital scopes, and told the kids today.
Using the external trigger, jitter is higher than when triggering off
a vertical channel. External trigs are often quantized to the ADC
clock rate, but a channel trigger works off the software-filtered
waveforms.
My summer intern built a GaN fet based 650 volt pulse generator with a transmission-line output transformer. Six different versions,
actually.
650 volts into 50 ohms is 13 amps, in about 2 ns. The opportunities
for ground loops and oscillation are multitude, but it works nicely. I
might post pics.
On 2025-08-13 22:47, john larkin wrote:
On Thu, 14 Aug 2025 02:11:26 +0200, Klaus Kragelund
<klauskvik@hotmail.com> wrote:
On 13/08/2025 04:17, john larkin wrote:
On Tue, 12 Aug 2025 21:14:55 -0000 (UTC), Sergey KubushynI have the HDO1074, hacked to 250MHz and a Siglent 100MHz scope, hacked
<ksi@koi8.net> wrote:
john larkin <jl@glen--canyon.com> wrote:
https://www.amazon.com/gp/aw/d/B0CGHTLRHS/
That's crazy. 4 channels at 12 bits and 250 MHz, built-in sig gen and >>>>>> logic analyzer, $764 overnight with free shipping.
I remember when a 30 MHz dual channel scope cost more than a
Chevrolet.
The fad in test equipment is black this year. Ugly.
Very nice scope. I have 2 at home (electronic and programming desk, separate
at opposite ends of the room) -- I work 100% from home -- and we purchased a
whole bunch of those for a company to use as everyday scope. We have a 50GHz
Tektronix in its dedicated room for signal integrity and other high
frequency testing but those DHO924S ones are on every desk now.
I really like it, even put my beloved Tek 2467B that I used before for >>>>> almost everything on a far shelf and never used it ever since. Have a >>>>> monster 4GHz 40Gsps LeCroy WR640Zi with all options on my electronic desk >>>>> too but don't remember where I powered it up last time -- it is 8-bit, >>>>> extremely complex, makes noise like a jet at takeoff so it is only used when
that bandwidth and those advanced options are really needed that is
extremely rare.
We have a 7 GHz LeCroy that nobody uses. The menus make no sense and
even LeCroy doesn't understand them.
DHO924S covers almost everything. Logic Analyzer is pretty basic but >>>>> sufficient for almost everything so my another jet sounding monster, HP >>>>> 16702B, also gathers dust now.
Very happy with it, would recommend to everybody.
---
******************************************************************
* KSI@home KOI8 Net < > The impossible we do immediately. *
* Las Vegas NV, USA < > Miracles require 24-hour notice. *
******************************************************************
We have maybe 20 of various Rigol scopes and I don't think any of them >>>> has ever broken.
We do have one Tek scope with galvanically isolated inputs and
trigger. That can be very handy.
to 750MHz. Never uses the Old tek scope any more.
My bench scope is a 350 MHz Rigol hacked to 500. We bought four and
they threw in the upgrade. But 750/100 is an outrageous ratio.
We bought this little 2-channel, 200-MHz Siglent for a road trip--$300
open box from Saelig.
Last week I discovered the first failure of any scope I ever had, the
Siglent behaved funny, non liniear input behaviour. Turned out I was
careless, in an earlier test with conducted immunity, I had monitoring
directly on the scope input and fried the channel. Now I have a 3
channel scope, repair is almost the same price as a new one :-(
One thing I've noticed about digital scopes, and told the kids today.
Using the external trigger, jitter is higher than when triggering off
a vertical channel. External trigs are often quantized to the ADC
clock rate, but a channel trigger works off the software-filtered
waveforms.
Yup. The external trigger is useless for fast stuff. Another good
argument for a 4-channel scope.
My summer intern built a GaN fet based 650 volt pulse generator with a
transmission-line output transformer. Six different versions,
actually.
650 volts into 50 ohms is 13 amps, in about 2 ns. The opportunities
for ground loops and oscillation are multitude, but it works nicely. I
might post pics.
Sure, why not? Sounds fun.
Cheers
Phil Hobbs
On Thu, 14 Aug 2025 14:29:20 -0400, Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:
On 2025-08-13 22:47, john larkin wrote:
On Thu, 14 Aug 2025 02:11:26 +0200, Klaus Kragelund
<klauskvik@hotmail.com> wrote:
On 13/08/2025 04:17, john larkin wrote:
On Tue, 12 Aug 2025 21:14:55 -0000 (UTC), Sergey KubushynI have the HDO1074, hacked to 250MHz and a Siglent 100MHz scope, hacked >>>> to 750MHz. Never uses the Old tek scope any more.
<ksi@koi8.net> wrote:
john larkin <jl@glen--canyon.com> wrote:
https://www.amazon.com/gp/aw/d/B0CGHTLRHS/
That's crazy. 4 channels at 12 bits and 250 MHz, built-in sig gen and >>>>>>> logic analyzer, $764 overnight with free shipping.
I remember when a 30 MHz dual channel scope cost more than a
Chevrolet.
The fad in test equipment is black this year. Ugly.
Very nice scope. I have 2 at home (electronic and programming desk, separate
at opposite ends of the room) -- I work 100% from home -- and we purchased a
whole bunch of those for a company to use as everyday scope. We have a 50GHz
Tektronix in its dedicated room for signal integrity and other high >>>>>> frequency testing but those DHO924S ones are on every desk now.
I really like it, even put my beloved Tek 2467B that I used before for >>>>>> almost everything on a far shelf and never used it ever since. Have a >>>>>> monster 4GHz 40Gsps LeCroy WR640Zi with all options on my electronic desk
too but don't remember where I powered it up last time -- it is 8-bit, >>>>>> extremely complex, makes noise like a jet at takeoff so it is only used when
that bandwidth and those advanced options are really needed that is >>>>>> extremely rare.
We have a 7 GHz LeCroy that nobody uses. The menus make no sense and >>>>> even LeCroy doesn't understand them.
DHO924S covers almost everything. Logic Analyzer is pretty basic but >>>>>> sufficient for almost everything so my another jet sounding monster, HP >>>>>> 16702B, also gathers dust now.
Very happy with it, would recommend to everybody.
---
****************************************************************** >>>>>> * KSI@home KOI8 Net < > The impossible we do immediately. * >>>>>> * Las Vegas NV, USA < > Miracles require 24-hour notice. * >>>>>> ******************************************************************
We have maybe 20 of various Rigol scopes and I don't think any of them >>>>> has ever broken.
We do have one Tek scope with galvanically isolated inputs and
trigger. That can be very handy.
My bench scope is a 350 MHz Rigol hacked to 500. We bought four and
they threw in the upgrade. But 750/100 is an outrageous ratio.
We bought this little 2-channel, 200-MHz Siglent for a road trip--$300
open box from Saelig.
Last week I discovered the first failure of any scope I ever had, the
Siglent behaved funny, non liniear input behaviour. Turned out I was
careless, in an earlier test with conducted immunity, I had monitoring >>>> directly on the scope input and fried the channel. Now I have a 3
channel scope, repair is almost the same price as a new one :-(
One thing I've noticed about digital scopes, and told the kids today.
Using the external trigger, jitter is higher than when triggering off
a vertical channel. External trigs are often quantized to the ADC
clock rate, but a channel trigger works off the software-filtered
waveforms.
Yup. The external trigger is useless for fast stuff. Another good
argument for a 4-channel scope.
My summer intern built a GaN fet based 650 volt pulse generator with a
transmission-line output transformer. Six different versions,
actually.
650 volts into 50 ohms is 13 amps, in about 2 ns. The opportunities
for ground loops and oscillation are multitude, but it works nicely. I
might post pics.
Sure, why not? Sounds fun.
Cheers
Phil Hobbs
https://www.dropbox.com/scl/fi/hsrh23rj2vrjxtjbmgzkj/X112-650V.jpg?rlkey=2xxuh9x0fzesbizq25e43b52z&raw=1
https://www.dropbox.com/scl/fi/me2sb6vrco8nxh3h2vo9b/X112_Bench.jpg?rlkey=ebl9rqw7l26cf4qpnk1vgywcm&raw=1
That's making isolated 650 volt pulses into 50 ohms. I pointed out to
him that he's putting 13 amps and 8.5 kilowatts into a 2-watt
MiniCircuits 40 dB attenuator.
I'm not sure if we have a use for this, but it is fun.
We also tested the EPC23104 monolithic GaN half-bridge driver. It blew
up. Not ready for prime time, looks like.
Is it not possible to optically play a record these days?
I can understand that you need a clear representation of the depth (at a
45 degree angle) of each groove wall over the length of the groove wall.
So you might want to put a stylus through it first to remove dust and anything else in the grooves. If you can get that information into a
computer then it should be possible to do various kinds of signal cleanup operations.
...and matrixing them to give vertical and horizontal vectors. That way
the 'scope picture actually represents the movement of the stylus and
allows objective correction of errors in the playback geometry. I am >particularly interested in the vector angle at which transient
high-speed phenomena occur (crackle). The angles and patterns tell me
how to select the right stylus and adjust the playback azimuth.
Then analog CRT scope and screen rotated 45 degrees to see needle position >> and movement? Just a few lines of asm and a cheap LCD would do.
No need for rotation
but an analogue 'scope needs a modification to
prevent screen-burn.
...and matrixing them to give vertical and horizontal vectors. That way >the 'scope picture actually represents the movement of the stylus and >allows objective correction of errors in the playback geometry. I am >particularly interested in the vector angle at which transient
high-speed phenomena occur (crackle). The angles and patterns tell me
how to select the right stylus and adjust the playback azimuth.
Then analog CRT scope and screen rotated 45 degrees to see needle position >> and movement? Just a few lines of asm and a cheap LCD would do.
No need for rotation
Simpler explanation: In a mono case, the stereo cartridge gives two equal signals on the left and right output If you use those for X and Y in a
scope, then as left and right are the same, you get a 45 tilted line on screen for a needle moving from left to right. (connect X and Y input of scope together and put your finger on the probe for some mains hum, and
see). So as the tilted line now represents moving left to right and back, rotate the CRT 45 degrees so the line is is horizontal, and really shows
the horizontal motion of the needle. Same for stereo, now with up and down included.
but an analogue 'scope needs a modification to
prevent screen-burn.
Yes, a simple AC detector should drive the CRT grid negative if no signal.
I use that in my Matrix (LED) displays, no signal from computer, screen
goes blank. Computer in this case is a Raspberry Pi connected to the back
of the display.
https://panteltje.online/pub/matrix_display_zoom_IMG_6609.JPG If you need
a computer for processing maybe a Raspberry can be small enough. Again,
you need to have some computer language and hardware skills to use Raspberries.
If you got other displays, LCDs should not burn in
but be aware of OLED displays, those DO burn in.
https://www.amazon.com/gp/aw/d/B0CGHTLRHS/
That's crazy. 4 channels at 12 bits and 250 MHz, built-in sig gen and
logic analyzer, $764 overnight with free shipping.
I remember when a 30 MHz dual channel scope cost more than a
Chevrolet.
The fad in test equipment is black this year. Ugly.
On Tue, 12 Aug 2025 12:33:57 -0700, john larkin <jl@glen--canyon.com>
wrote:
https://www.amazon.com/gp/aw/d/B0CGHTLRHS/
The manual is just a little piece of paper
with a QR code that doesn't work.
On Fri, 15 Aug 2025 06:54:11 -0700, john larkin <jl@glen--canyon.com>
wrote:
On Tue, 12 Aug 2025 12:33:57 -0700, john larkin <jl@glen--canyon.com> >>wrote:
https://www.amazon.com/gp/aw/d/B0CGHTLRHS/
The manual is just a little piece of paper
with a QR code that doesn't work.
"HDO900 Series Digital Oscilloscope" ><https://int.rigol.com/Images/DHO900_UserGuide_EN_tcm7-6003.pdf>
On Fri, 15 Aug 2025 07:20:14 -0700, Jeff Liebermann <jeffl@cruzio.com>
wrote:
On Fri, 15 Aug 2025 06:54:11 -0700, john larkin <jl@glen--canyon.com> >>wrote:
On Tue, 12 Aug 2025 12:33:57 -0700, john larkin <jl@glen--canyon.com> >>>wrote:
https://www.amazon.com/gp/aw/d/B0CGHTLRHS/
The manual is just a little piece of paper
with a QR code that doesn't work.
"HDO900 Series Digital Oscilloscope" >><https://int.rigol.com/Images/DHO900_UserGuide_EN_tcm7-6003.pdf>
289 pages.
The best feature is the DEFAULT button: get me the hell out of here
and be an oscilloscope again.
On Tue, 12 Aug 2025 12:33:57 -0700, john larkin <jl@glen--canyon.com>
wrote:
https://www.amazon.com/gp/aw/d/B0CGHTLRHS/
That's crazy. 4 channels at 12 bits and 250 MHz, built-in sig gen and
logic analyzer, $764 overnight with free shipping.
I remember when a 30 MHz dual channel scope cost more than a
Chevrolet.
The fad in test equipment is black this year. Ugly.
We got the scope. It has a built-in signal generator that will do AM
or FM or PM sweeps. It has insane levels of signal processing and
dozens of touch-screen menus.
It has HDMI so we put the display on our giant OLED on the wall.
That's kind of cool.
I gave it to the kids so I can have my 500 MHz scope back. This one is
way too complex for me. The manual is just a little piece of paper
with a QR code that doesn't work.
On Tue, 12 Aug 2025 12:33:57 -0700, john larkin <jl@glen--canyon.com>
wrote:
https://www.amazon.com/gp/aw/d/B0CGHTLRHS/
That's crazy. 4 channels at 12 bits and 250 MHz, built-in sig gen and
logic analyzer, $764 overnight with free shipping.
I remember when a 30 MHz dual channel scope cost more than a
Chevrolet.
The fad in test equipment is black this year. Ugly.
We got the scope. It has a built-in signal generator that will do AM
or FM or PM sweeps. It has insane levels of signal processing and
dozens of touch-screen menus.
It has HDMI so we put the display on our giant OLED on the wall.
That's kind of cool.
I gave it to the kids so I can have my 500 MHz scope back. This one is
way too complex for me. The manual is just a little piece of paper
with a QR code that doesn't work.
