EEVblog Electronics Community Forum

Products => Test Equipment => Topic started by: EdoFede on December 21, 2015, 02:51:53 am

Title: Rigol DS2000A - CH1/CH2 difference in noise and mechanical vibration sensibility
Post by: EdoFede on December 21, 2015, 02:51:53 am
Hi all,
I'm playing around and testing with my new DS2072A scope.

Someone other than me, has noticed different sensibility to noise and mechanical vibration between CH1 and CH2?

I found out by trying to connect two 50 Ohm terminator to the inputs.
CH1 got some spikes with terminator attached, CH2 near-no difference.
(500uV/div)

Without terminators:
(http://www.eevblog.com/forum/testgear/rigol-ds2000a-ch1ch2-difference-in-noise-and-mechanical-vibration-sensibility/?action=dlattach;attach=188496;image)

With terminators:
(http://www.eevblog.com/forum/testgear/rigol-ds2000a-ch1ch2-difference-in-noise-and-mechanical-vibration-sensibility/?action=dlattach;attach=188498;image)


Another strange behaviour I've noticed is a big difference in sensibility to mechanical vibration between CH1 and CH2.

Tapping front panel:
(http://www.eevblog.com/forum/testgear/rigol-ds2000a-ch1ch2-difference-in-noise-and-mechanical-vibration-sensibility/?action=dlattach;attach=188500;image)

Closing top handle:
(http://www.eevblog.com/forum/testgear/rigol-ds2000a-ch1ch2-difference-in-noise-and-mechanical-vibration-sensibility/?action=dlattach;attach=188502;image)


Not a big issue, but strange, not?

I've also noticed a slight positive DC offset (about 0.2div) on CH1, even after auto-cal run.

Bye,
Edoardo