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| New Rigol DS7000 |
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| 2N3055:
--- Quote from: carl0s on July 20, 2018, 09:15:19 am ---Not sure if it's been mentioned already, but one slightly disappointing thing, maybe, is that the 10 GSa/s is, erm, muxed over all 4 channels. Whereas on other 4ch scopes, I think, it's just muxed across AB and CD. So while it's 10GSa/s when using one channel, you can't do the trick of using CH1 and CH3 to still get the full sample rate. e.g. on a ds1054z with 1GSa/s, you could use CH1 and CH3 and it won't split the sampling rate in half. Sampling 4 channels on a DS1054z would give 500MSa/s per channel, and the DS7000 would give 2.5GSa/s. I suppose it's still a minimum of 5x greater. Using 1 channel it's 10x greater, any more than 1 channel, it's never more than 5x greater. --- End quote --- They all do that. At least you can have on ch with 10GS. All other have with 2x5GS shared over 4 channel(2.5 GS/ch), or 4x2.5 GS, or 1x5GS over 4ch (1.25 GS/ch).... You have to go to a class higher scopes to have higher sample rates... 5x than analog bandwidth of input channel is absolutely perfect. |
| carl0s:
Ah fair enough. Maybe it's the sample memory then? I can't remember what it was, but something is split per bank of A/B and C/D. |
| carl0s:
--- Quote from: 2N3055 on July 20, 2018, 10:12:20 am --- --- Quote from: carl0s on July 20, 2018, 09:15:19 am ---Not sure if it's been mentioned already, but one slightly disappointing thing, maybe, is that the 10 GSa/s is, erm, muxed over all 4 channels. Whereas on other 4ch scopes, I think, it's just muxed across AB and CD. So while it's 10GSa/s when using one channel, you can't do the trick of using CH1 and CH3 to still get the full sample rate. e.g. on a ds1054z with 1GSa/s, you could use CH1 and CH3 and it won't split the sampling rate in half. Sampling 4 channels on a DS1054z would give 500MSa/s per channel, and the DS7000 would give 2.5GSa/s. I suppose it's still a minimum of 5x greater. Using 1 channel it's 10x greater, any more than 1 channel, it's never more than 5x greater. --- End quote --- They all do that. At least you can have on ch with 10GS. All other have with 2x5GS shared over 4 channel(2.5 GS/ch), or 4x2.5 GS, or 1x5GS over 4ch (1.25 GS/ch).... You have to go to a class higher scopes to have higher sample rates... 5x than analog bandwidth of input channel is absolutely perfect. --- End quote --- Hmm I guess I've got confused somewhere along the way, but the Siglent 4ch scopes have 2x ADC and 2x storage over the 2ch scopes. I just watched Dave's teardown of the DS1054z again and I see all 4 channels go into the same ADC. |
| 2N3055:
They have dual 1Gs/sec that is 500MS/sec per ch... I think 10GS/sec divided by 4 is still 2,5GS/sec per channel.. And it has 100/250/500 Msamples memory divided by 4. Keysight DSOX3000T has 4Msamples... |
| tautech:
--- Quote from: carl0s on July 20, 2018, 04:06:01 pm ---Hmm I guess I've got confused somewhere along the way, but the Siglent 4ch scopes have 2x ADC and 2x storage over the 2ch scopes. I just watched Dave's teardown of the DS1054z again and I see all 4 channels go into the same ADC. --- End quote --- Yes, that's the point of difference and the reason for the higher price......2 ADC's. |
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