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rigol ds1054z, only 500 Msa/s when only 1 channel active, is it normal ?

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blandiant:
Hi,
i just got a rigol ds1054z with all the options.
When all the channel are turned off, it is writen on the screen that the sample rate is 1 Gsa/s and the memory depth is 24Mpts but as soon as i activate one channel(no matter which one) it is written that the sample rate is 500Msa/s and the memory depth is 12Mpts, and i can't use a higher sample rate/memory depth than this.
Is it normal ? (i attach 2 pictures to show you)

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Thank you

Mechatrommer:
yes its normal when your trigger channel is not the one shown.

Zero999:
It's because it achieves 1Gsa/s by interleaving multiple ADCs (I can't remember how many, look it up if you're interested) with a lower bandwidth. With only one channel activated, all the ADCs become allocated to that single channel, so the sample rate can be higher, than with two channels activated. I can't remember whether activating three or more channels limits the sample rate even further, but someone else here will know.

Mechatrommer:

--- Quote from: Hero999 on August 05, 2018, 12:42:56 pm ---I can't remember whether activating three or more channels limits the sample rate even further, but someone else here will know.

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yes, any active channels, including triggering channel, even if not visible, more than 2 = 250MS/s

Adrian_Arg.:
1 active channel 1 Gsa / s
2 active channels 500 Msa / s
with 3 and 4 activated channels 250 Mgs / s

I do not know if it influences that I have it released as a DS1104Z

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