Re: Instead scopes

On 30/08/2024 1:49 am, john larkin wrote:

On Fri, 30 Aug 2024 00:43:39 +1000, Bill Sloman <bill.sloman@ieee.org>
wrote:
 

On 30/08/2024 12:16 am, john larkin wrote:

On Thu, 29 Aug 2024 06:55:15 -0700, john larkin
<jlarkin_highland_tech> wrote:
>

On Thu, 29 Aug 2024 05:46:54 GMT, Jan Panteltje <alien@comet.invalid>
wrote:
>

On a sunny day (Wed, 28 Aug 2024 09:32:58 -0700) it happened john larkin
<jlarkin_highland_tech> wrote in <mtjucjdqe2f91c2jsjp6011k0uvakuimog@4ax.com>:
>

On Wed, 28 Aug 2024 15:21:00 -0000 (UTC), Sergey Kubushyn
<ksi@koi8.net> wrote:
>

john larkin <jlarkin_highland_tech> wrote:

On Wed, 28 Aug 2024 04:28:02 -0000 (UTC), Sergey Kubushyn
<ksi@koi8.net> wrote:
>

john larkin <jlarkin_highland_tech> wrote:

On Tue, 27 Aug 2024 14:55:32 -0400 (EDT), Martin Rid
<martin_riddle@verison.net> wrote:
>

john larkin <jlarkin_highland_tech> Wrote in message:r

On Tue, 27 Aug 2024 10:40:15 -0400 (EDT), Martin Rid<martin_riddle@verison.net> wrote:>Anyone own the gds-1202b ?>>Any
good?>>$350 at tequipment>>CheersI haven't tried that one. We like the Rigols.I recently acquired a
Siglenthttps://www.amazon.com/gp/product/B06XZML6RD/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1and gave it to one of my engineers. I'll ask him how he
likes it.It has an up-front DEFAULT button, which a digital scope needs to getyou out of nightmare states.

>
Other than the lack of software features,  the 200mhz bw for 350
dollars is intriguing.
>
Cheers

>
It sounds pretty good to me.
>
https://siglentna.com/wp-content/uploads/dlm_uploads/2020/02/SDS1000X-E_DataSheet_DS0101E-E04C.pdf
>
What's missing?
>
I like the 500 uV/div.

>
If you want to save the last penny, maybe. But you can get way better scope
for slightly more -- Rigol DHO800/DHO900. It is 12-bit, same 550uV/div, has
all standard serial protocols decoding, very light and compact, can work
from a battery with USB-C power connector, way better than that Siglent that
feels like relic next to those DHOs.

>
We use almost all Rigols at work. My slow bench scope is a 500 MHz
DS4034 (upgraded from 350 MHz)
>
https://www.dropbox.com/scl/fo/ns08x686afbayjsw8c2ab/h?rlkey=iu4h89057t755pueg4ijnldbo&dl=0
>
and my fast scope is a Tek 11802 sampler.

>
I also have one, 11801C. Couple of SD-24s, SD-20, and SD-22 heads :)

>
At the original purchase price, adjusted for inflation, I must have
half a million dollars worth of sampling heads.
>
The color grading and jitter measurement is great on the 11801C, but
the old B+W screens photograph better.
>
I'll miss my 11802 when it eventually dies.
>
The TDR is great. I'm going to give my new kids a lecture on
transmission lines, and I'll show them some TDR.
>
It is apparently possible these days to get an EE degree and be
completely ignorant of transmission lines. Or even electricity.

>
oops!
>
Then what DO they know?

>
How to type c++

>
One issue here is that it's cheaper and easier to teach coding, than
it is to teach electronics.
>
I walked through the Cornell EE school. I saw about 25 computer
screens and one oscilloscope.

>
It's lot easier and quicker to bread-board a circuit in LTSpice than it
is to wire up a test circuit, but what that means is that you need to
make fewer real circuits and they are a lot more likely to work when tested.
>
That, on it's own, is enough to explain why labs look different today
than they did in the dark ages.

 Except that many recent EE grads don't know how to run LTSpice.

They were trained on some other version of Spice? Or some other simulation program?

I guess you don't meet many young engineers any more.

I'm treasurer of the NSW branch of the IEEE. I get to met a few from time to time. One had just finished a Ph.D. on a flexible implantable liquid crystal electrode for nerve cells (which you interrograted with a laser). I passed on one her papers to Australia's then chief scientist (whom I happened to know) who made his money out of measuring nerve cell potentials exactly. He liked the paper, but said it was thirty years too late for him.

I do. If they are really smart, I can teach them the basics in about a year.

Or your version of the basics, which seems to be odd enough that they might take a year to find out what kind of responses you expect to get.

I've got two cases in my new design center.

They've got my sympathy.

Today's lecture will be about transmission lines, starting with the
Pony Express and Morse and the first telegraphs, and the transatlantic
fiasco and Heaviside.

Heaviside is where it starts to get interesting. William Thompson - later Lord Kelvin - was directly involved with the early transatlantic telegraph links. Heaviside came later.

I'll show them an LT Spice transmission line example on our giant new
OLED screen, and a real TDR on my 11802.

What are you doing about the math? - not that I ever needed to get into that though it did prompt me to go for calculators that could handle hyperbolic trigometrical functions.
--
Bill Sloman, Sydney