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

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Hydrawerk:
Set the coupling to AC mode.

kizzap:

--- Quote from: Hydrawerk on October 17, 2013, 08:51:23 am ---Set the coupling to AC mode.

--- End quote ---

Perfect! Thankyou from a Oscilloscope noob.

-kizzap

Galaxyrise:

--- Quote from: kizzap on October 17, 2013, 08:31:06 am ---Pushing the knob I am turning (the smaller knob for the channel) puts zero volts onto the centre of the horizontal vertical division. Maybe I need to change a setting somewhere.

--- End quote ---

For when DC coupling is important, (from memory) there is a setting in the Utility->System menu called "VerticalExp" which is "Ground" by default.  I use "Center".  With it set to Center, whatever is in the center of the screen stays there as I change the vertical resolution.  So say I want to watch a 5V signal.  I start at 2V/div, spin the little knob to get the 5V signal on the center graticule, then start turning the big knob to zoom in, making small adjustments to the little knob as needed.  There is a limit to how far you can zoom in this way.  You can zoom in more with a 10x probe than with a 1x probe (since the maximum offset doesn't get scaled.)  Getting the signal centered this way takes hardly any time at all, though it's certainly not quite as easy as pressing a single button.

I've been doing this a lot lately, as I'm looking at small, low frequency stuff (which would be lost in the noise with ac coupling), putting the scope into roll mode at like 2s/div and watching the trace go by. 

kizzap:

--- Quote from: Galaxyrise on October 17, 2013, 04:03:47 pm ---
--- Quote from: kizzap on October 17, 2013, 08:31:06 am ---Pushing the knob I am turning (the smaller knob for the channel) puts zero volts onto the centre of the horizontal vertical division. Maybe I need to change a setting somewhere.

--- End quote ---

For when DC coupling is important, (from memory) there is a setting in the Utility->System menu called "VerticalExp" which is "Ground" by default.  I use "Center".  With it set to Center, whatever is in the center of the screen stays there as I change the vertical resolution.  So say I want to watch a 5V signal.  I start at 2V/div, spin the little knob to get the 5V signal on the center graticule, then start turning the big knob to zoom in, making small adjustments to the little knob as needed.  There is a limit to how far you can zoom in this way.  You can zoom in more with a 10x probe than with a 1x probe (since the maximum offset doesn't get scaled.)  Getting the signal centered this way takes hardly any time at all, though it's certainly not quite as easy as pressing a single button.

I've been doing this a lot lately, as I'm looking at small, low frequency stuff (which would be lost in the noise with ac coupling), putting the scope into roll mode at like 2s/div and watching the trace go by.

--- End quote ---

 :-+ Exactly what I was after, I am mucking around with a power supply design, testing output ripple which you do kinda need to know in relation with the output voltage.

As an aside note, I found that using AC coupling, the ripple existed between -3 and -10mV, as in not symetric about "0" Volts. I'm assuming that this is to be expected?

Mark_O:
Last January, marmad wrote:


--- Quote from: marmad on January 09, 2013, 02:35:33 pm ---How could BMPs be faster than PNGs? They are often ~100x bigger - and writing to an external device usually requires more time than processing - although I can't say I've actually timed saving BMPs on the DS2000. Also, I don't know if the brand of USB stick you're using (or FW 01.00.02) affects save/transfer rates - but my timed speeds are:

My Rigol takes ~15 seconds to write a PNG file to a USB stick.
--- End quote ---

This isn't quite accurate.  Your 15 secs is the time to first convert the BMP to a PNG internally, THEN write it to USB.  As you correctly pointed out, PNGs are vastly smaller, and would thus write out much more quickly.


--- Quote ---The Rigol UltraVision Utilities take ~2.3 seconds using USB to transfer, convert & save a BMP (all bitmap transfers from the DSO are BMP - conversion to other formats is handled by RUU).
--- End quote ---

That implies the actual data transfer rate over USB is in excess of 490 kB/sec (since a bit of that 2.3 sec is used on the PC side for conversion from BMP to PNG).  That's assuming the images are 24-bits deep (x800 x480, or 1125 kB each).  Of course, writing to a USB stick may be a bit slower, or a lot slower, depending on the stick.  But if you did write a screen image out in BMP format, and timed it, I suspect you'd find it would be much less than 15 secs. 

Since the actual transfer rate would be the same in both cases (using the same stick), and the sizes of the PNG and BMP are both known, you could then calculate the separate contributions from transfers and BMP conversions.  (First factor out the fixed transfer rate, then determine the conversion overhead.)

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