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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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