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Sniffing the Rigol's internal I2C bus

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Rigby:
The gain after calibration is very, very small.  Seems like the gain is within measurement noise.  Am I wrong?  I guess I was looking for a huge improvement.

marmad:

--- Quote from: Rigby on December 16, 2013, 04:33:43 pm ---The gain after calibration is very, very small.  Seems like the gain is within measurement noise.  Am I wrong?  I guess I was looking for a huge improvement.

--- End quote ---

It's HW v.1, IMO, to be expected. I imagine HW v.2 and A models are better.

EV:
No, the sweep is from 1 MHz to 350 MHz. I checked my text and picture titles there reads 350 not 300.


--- Quote from: JDubU on December 16, 2013, 05:03:03 pm ---
EV,

I'm not sure that I understand your measurement.
You said that the signal generator is producing a sine wave sweep between 1MHz and 300MHz over a time span of 14 seconds (24.93MHz per second assuming a linear frequency sweep).

The DS2000 display is showing that it's horizontal time base is set to 1 second per division and we see a waveform covering all 14 horizontal divisions of the display.
We also see that the trigger point is off the left side of the display by 1.5 seconds (display shows trigger delay of 8.5 seconds minus 7 divisions of 1 second each).
Wouldn't that mean that the actual sweep time from the generator is at least 15.5 seconds? 
If so, then the sweep would be 349/15.5 = 22.52MHz per second and the -3db point would be about 342MHz since there is an extra 1.5 seconds of sweep off the left side of the display (assuming the the sweep also ends at exactly the last graticule line of the display).

Or are you manually triggering the scope and then centering the entire sweep on the display?

--- End quote ---

JDubU:
I see now.  I was confused by the offset trigger point.

Carrington:
Photo montage 350 MHz BW  :)


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