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

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Wim13:

--- Quote from: egonotto on June 23, 2013, 02:28:10 pm ---Hello Wim13,

can you please explain what a measuring head does.
Is it that it measure the signal at the input of scope and  adjust the signal at generator, so that the amplitude of the signal at input from scope is always the same?

Best Regards
egonotto

--- End quote ---

Thats correct, the input of the DSO is a complex impedance , so you never know what voltage there is on the
BNC connector of the DSO.  Whit a measuring head you keep the voltage constant on
the BNC input of the DSO. Normally the signal generator keeps it output constant
intermally on it final stage.

egonotto:
Hello Wim13,

thanks.

Best Regards
egonotto

Wim13:

Anti Aliasing

A few posts back, there was about aliasing, i had now on hands a nice example where i needed anti aliasing,
and you can clearly see the effects.

In the first picture below you see a 95 Mhz signal with AM modulation of 100 hz 50 %
no problem, but on the second picture, the carrier changed to 100 Mhz, and then it happens.

Because the sample speed is 200 Msa/s and the freq is 100 Mhz, see picture 2 below

Then i switch the persis. time to longer and then you get the wanted picture back. picture 3.
Turning on anti aliasing does not change anything, only the brightness.

marmad:

--- Quote from: Wim13 on June 23, 2013, 06:05:22 pm ---Turning on anti aliasing does not change anything, only the brightness.

--- End quote ---

Yes, my friend. We have decided that the coder who wrote the anti-aliasing FW routine thought his manager meant image anti-aliasing.  ;D  But I'd rather not have it at all - then having it ON all the time like it is on the Agilent X DSOs - causing crappy-looking randomly sampled waveforms when zoomed in.  ;)

jamesb:
Interesting results, Wim13 ... they seem to agree with my casual observation / suspicion that the actual bandwidth (of my 2202) was much greater than the advertised 200MHz. Interesting to see that the -3dB point is around 275MHz

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