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Best Brand Name for an Oscilloscope?
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BillyO:

--- Quote from: tautech on December 01, 2022, 02:06:50 am ---Yes but the pic title already tells you the model series is 2kX+ so now where are your calcs ?

TBH your guess of SDS2204X Plus could conceivably be miles out unless you do your homework on the BW of each model in this series.

--- End quote ---

The BW of the 200 series are 100MHz, 200MHz and 350MHz (and sometimes 500MHz)

So, calcs ..

Tr=~ 0.425/BW

100MHz:  Tr =~ 0.425/100MHz = 4.24ns

200MHz:  Tr =~ 0.425/200MHz = 2.12ns

350MHz:  Tr =~ 0.425/350MHz = 1.21ns

Your screen shot showed 2ns so 200MHz is the closest.

I didn't notice the filename so now I'll say I'm 95% sure it's and SDS2204XP.
tautech:

--- Quote from: BillyO on December 01, 2022, 02:21:03 am ---
--- Quote from: tautech on December 01, 2022, 02:06:50 am ---Yes but the pic title already tells you the model series is 2kX+ so now where are your calcs ?

TBH your guess of SDS2204X Plus could conceivably be miles out unless you do your homework on the BW of each model in this series.

--- End quote ---

The BW of the 200 series are 100MHz, 200MHz and 350MHz (and sometimes 500MHz)

So, calcs ..

Rt=~ 0.425/BW

100MHz:  Rt =~ 0.425/100MHz = 4.24ns

200MHz:  Rt =~ 0.425/200MHz = 2.12ns

350MHz:  Rt =~ 0.425/350MHz = 1.21ns

Your screen shot showed 2ns so 200MHz is the closest.

I didn't notice the filename so now I'll say I'm 95% sure it's and SDS2204XP.

--- End quote ---
:)
It is but......
https://www.eevblog.com/forum/testgear/siglent-sds2000x-plus-coming/msg2958288/#msg2958288

SDS2104X Plus has a -3dB BW of ~185 MHz and is the reason it's supplied with 200 MHz rated probes.

Based on that you might trim your calcs to better fit with a 30ps pulser.  ;)

Yeah, I set you up.  :P
BillyO:
Well, I didn't know that about the SDS2104XP even though I have one.  Nice scope!

I actually "improved" it within minutes of getting it out of the box so never tested in it's NIB mode.

There is actually a story about my "improvement journey" which I will relate to the forum when I verify some things.  As it is right now I'm seeing about 700MHz BW using a frequency sweep, but this is one of the things I need to verify.  More on all this later in a different thread.

Anyway, our little banter here verified my assertion that a transient response can get us very close.  Can you do a frequency sweep on that scope to see how close we came?  It might even be a tad better than the 185MHz.
nctnico:

--- Quote from: tautech on December 01, 2022, 02:26:11 am ---Based on that you might trim your calcs to better fit with a 30ps pulser.  ;)

--- End quote ---
That is the problem: in the end you can't determine the exact bandwidth using a pulser because you don't know what the roll-off 'factor' of the front end is.
tautech:

--- Quote from: BillyO on December 01, 2022, 02:43:13 am ---Well, I didn't know that about the SDS2104XP even though I have one.  Nice scope!

I actually "improved" it within minutes of getting it out of the box so never tested in it's NIB mode.

There is actually a story about my "improvement journey" which I will relate to the forum when I verify some things.  As it is right now I'm seeing about 700MHz BW using a frequency sweep, but this is one of the things I need to verify.  More on all this later in a different thread.

Anyway, our little banter here verified my assertion that a transient response can get us very close.  Can you do a frequency sweep on that scope to see how close we came?  It might even be a tad better than the 185MHz.

--- End quote ---
IIRC SDS2504X Plus BW is nearly 600 MHz and it's reported somewhere in the 2kX Plus thread.

First SDS2104X Plus we got hands on is what I tested and as reported in the link to post above and I flat out didn't believe it was ~185 MHz but tested with 3 yes 3 sinewave sources confirmed it was.  :o
I'd never seen the likes of rated BW exceeded by 85% in any instrument.

Missing my now sold SSG3021X already.  :(
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