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

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Circlotron:
Not sure if anyone else has seen this yet - Each trace has a pointer at the edge of the screen identifying it as CH1 or CH2. With no signal in, CH2 trace lines up perfectly with CH2 pointer and so the offset reading of the trace (if any) corresponds with the trace position. For CH1 the pointer and the trace are offset by several pixels so the offset reading and the trace position are different. For example the pointer might be offset three divisions and the reading shows 3.00 volts offset but the trace is not directly over the graticule line. This is after the scope has calibrated itself after running about 6 hours. What's more, this offset of CH1 trace varies as you turn CH2 off and on.

marmad:

--- Quote from: Circlotron on January 25, 2014, 11:55:26 am ---With no signal in, CH2 trace lines up perfectly with CH2 pointer and so the offset reading of the trace (if any) corresponds with the trace position. For CH1 the pointer and the trace are offset by several pixels so the offset reading and the trace position are different.
--- End quote ---

Actually, on my DS2000 it's the opposite: with no input, CH2 is offset by a few pixels.


--- Quote ---This is after the scope has calibrated itself after running about 6 hours. What's more, this offset of CH1 trace varies as you turn CH2 off and on.
--- End quote ---

I haven't calibrated my DSO for awhile, but the slight offset of CH2 does not change with CH1 being turned on and off. But as long as the DSO is aware of the offset (i.e. it's included in any measurements), I don't think it particularly matters. To check if there is an offset between the pointer and what the DSO perceives as ground, set the coupling to GND.

marmad:
Here are my maximum offsets at the lowest voltage scale. You can see the slightly larger offset in CH2's stats:

EDIT: BTW, the channel pointer is supposed to point to ground - not the input signal level. If there is offset, the trace shouldn't line up with the pointer.

Circlotron:
Okay.
I've taken a video and trying to compress it to a reasonable size to upload to youtube.

Circlotron:

--- Quote from: Circlotron on January 25, 2014, 01:05:21 pm ---Okay.
I've taken a video and trying to compress it to a reasonable size to upload to youtube.

--- End quote ---
Righteo, here it is, 273MB compressed to 13MB for the sake of upload.
http://youtu.be/6OQOK85-r0c

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