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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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