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

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jlmoon:

--- Quote from: Teneyes on December 04, 2014, 05:28:07 pm ---
--- Quote from: NikWing on December 04, 2014, 03:52:34 pm ---is it normal that my Rigol measures a higher value than my other DSOs? and is there a way to calibrate it to show the correct value instead of using corrections in math?

--- End quote ---
I am not sure.
Have you preformed the Rigol  'Selfcal"  recently

--- End quote ---


I have had to use the 'Selfcal' when in doubt on my DS2202 as well.  I have found it better to terminate the inputs with a 50 ohm bnc term device before I Self-Cal as well.  Keeps any extraneous noise from creeping in on those inputs while in cal mode. 

NikWing:
I've used self-cal, yes (and I mentioned that I kinda hate it "reboots" afterwards and forgets the settings I made before self-cal)

selc-cal says something like "remove all inputs from the DSO before self-cal", I think I'll try it though
I guess I can use 50 Ohm-terminators from old network-cards for that?

Teneyes: yeah, but you need network connection to use that software :)
but why does the menu offer 3 options that have no effect ^^

NikWing:
okay, I rephrase: it needs a PC ^^

Purevector:
I have found a bug related to switching between roll and YT mode in the newest firmware.  Here is the description:

1. In roll mode with vertical scale set to 5mV/div - Signal is ~18mV
2. Switch to YT mode, scale still indicates 5mV/div - Signal is ~8mV (???what???)
3. Change vertical scale to 10mV/div - Signal looks unchanged, but measurements updated ~17mV
4. Changes vertical scale to 5mV/div - Signal appears and measures as it should ~18mV

In summary, when switching from roll mode to Y-T while at 5mV/div (lowest setting, 10x probe) the scope adjusts the physical gain to 10mV/div for no apparent reason, and does not change scale readout.  Adjusting vertical scale returns the scope to the correct gain.

See attached pics.

NikWing:
just a question, IIRC this was being talked about here, but I can't find it and it's not in the bug list, either:
if I have some random signal on the screen, like ripple noise and I push the stop button, I see multiple lines on screen until I change the time base (and back to where it was)
is that a bug?

and I add another question about triggering:
I've attached a random picture. Usually I would trigger at A
is it possible to trigger at B although there's a higher peak in the signal? Is it possible to tell the scope to always trigger at a desirered point on the curve?
Would I set the trigger level to let's say B and then use delay/offset or nth recurrence, or is there another way?

And, would it be possible to analyze just the part I marked with C, as in pretending that this is the real signal (which kinda "repeats" between B and A)?
I don't know how to phrase that D:

I hope it's okay to ask all of that here, else please tell me where I could do it. Like I said, I usually learn things when I need them, so this might be a silly question after all ^^;

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