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REVIEW - Rigol DS2072 - First Impressions of the DS2000 series from Rigol
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Wim13:

--- Quote from: Carrington on June 30, 2013, 07:11:20 pm ---This input stage is a Hantek / TEKWAY ...

As you can see there are slight differences.

--- End quote ---

The Rigol has a differnt chip on the entry, that can be programmed for the bandwidth, and can
be changed by software, so very different from the Hantek

From the TI datsheet of this chip:

The LMH6518 gain is programmed via a SPI-1
compatible serial bus. A signal path combined gain
resolution of 8.5 mdB can be achieved when the
LMH6518's gain and the Gsps ADC's FS input are
both manipulated. Inputs and outputs are DC-
coupled. The outputs are differential with individual
Common Mode (CM) voltage control (for Main and
Auxiliary outputs) and have a selectable bandwidth
limiting circuitry (common to both Main and Auxiliary)
• Oscilloscope Programmable Gain Amplifier
of 20, 100, 200, 350, 650, 750 MHz or full bandwidth.


for the 2072 it is 100 Mhz
for the 2102 it is 200 Mhz
for the 2202 it is 350 Mhz

Because of its 1 MOhm entry is loses some of its real bandwidth.
And that is why you see on all models the 20 Mhz filter.
Carrington:

--- Quote from: Wim13 on July 01, 2013, 04:17:56 pm ---
--- Quote from: Carrington on June 30, 2013, 07:11:20 pm ---This input stage is a Hantek / TEKWAY ...

As you can see there are slight differences.

--- End quote ---

The Rigol has a differnt chip on the entry, that can be programmed for the bandwidth, and can
be changed by software, so very different from the Hantek

From the TI datsheet of this chip:

The LMH6518 gain is programmed via a SPI-1
compatible serial bus. A signal path combined gain
resolution of 8.5 mdB can be achieved when the
LMH6518's gain and the Gsps ADC's FS input are
both manipulated. Inputs and outputs are DC-
coupled. The outputs are differential with individual
Common Mode (CM) voltage control (for Main and
Auxiliary outputs) and have a selectable bandwidth
limiting circuitry (common to both Main and Auxiliary)
• Oscilloscope Programmable Gain Amplifier
of 20, 100, 200, 350, 650, 750 MHz or full bandwidth.

--- End quote ---

Yes, but something makes me think that there is something more.
Imagine sending the command to 750MHz BW  :scared:

As you can see there are more things besides the LMH6518.

I wonder how the input stage seems to the schematic at the LMH6518 datasheet...

It is likely that there are differences in the input stages of the DS2000 series.
marmad:

--- Quote from: zibadun on July 01, 2013, 03:04:48 pm ---sorry I may be late to the party..

The anti-aliasing function may not do what you expect but it does work. Here is an example same signal with and without anti-aliasing.  I should have tried to zoom in to see what the actual waveforms look like. But there is some difference
CH1 is ~700Hz and CH2 is @ 7 MHz envelopes.   The second picture - Antialiasing ON

--- End quote ---

This has nothing to do with what I expect - it has to do with what anti-aliasing MEANS in terms of DSOs. What you are showing in your images has nothing to do with anti-aliasing in reference to a DSO. If you think it does, give me a link to an explanation (which contains the terms 'anti-aliasing' and 'DSO'). OTOH, I can you dozens of links to explanations of what anti-aliasing SHOULD be doing on a DSO.

I know the Rigol is doing SOMETHING when you turn on anti-aliasing, but it's definitely NOT doing anti-aliasing as defined for DSOs - thus it DOES NOT WORK.
marmad:

--- Quote from: Carrington on July 01, 2013, 04:22:19 pm ---It is likely that there are differences in the input stages of the DS2000 series.

--- End quote ---

Wim's chart of the different BW's of the different models was all made on the same DSO - he just changed the BW via software codes.
Carrington:

--- Quote from: marmad on July 01, 2013, 04:37:00 pm ---
--- Quote from: Carrington on July 01, 2013, 04:22:19 pm ---It is likely that there are differences in the input stages of the DS2000 series.

--- End quote ---

Wim's chart of the different BW's of the different models was all made on the same DSO - he just changed the BW via software codes.

--- End quote ---

Oh I understand, sorry for the confusion.  :phew:

Imagine sending the command to 750MHz BW  :scared:
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