Bad resolution waveform transferred from Lecroy oscilloscope to PC

Hello,
I am currently using Lecroy WavePro 7300A to analyze waves. When I tried to acquire the waveform from this oscilloscope to my nearby PC via Ethernet cable (using VICP::x.x.x.x as VISA address) I got problems with the resolution of the waveform picture.
In fact, as you can see from my attached pictures, the BadRes.jpg picture represent the captured waveform when the vertical scale of the oscilloscope was set to 50mV/div and the GoodRes.jpg represent the waveform when the vertical scale was only 10mV/div. The peak value of the waveforms is around -12.5mV to 12.5mV
It is quite obvious that the main trends of the two waveforms captured are the same, but from my point of view, it is like you have 2 pictures of the same scene and size, but one of them has only 1 megapixel resolution, and the other one has 5 megapixel, so the second one looks sharper when the size of the pictures is large enough.
Consider the LabView VIs, I have enclosed my GetWave.vi as you saw in the pictures, and all other the sub VIs either comes from the default VIs (when install LabView), or VIs from the installation of LabView Driver CDs, or VI from the installation of Lecroy Drivers "lcwave" and "LeCroy Wave Series". I am currently using LabView 8.2.
Finally, I would like to ask if there is any to get a good resolution of the waveform even when I set the vertical scale of the oscilloscope to very large, say 100mV, for example.
Thank you for your reading.
SG.
Attachments:
GetWave.vi ‏40 KB
BadRes.JPG ‏119 KB
GoodRes.JPG ‏118 KB

Hi - Alan from LeCroy Tech Support here...
Let's start with the 10mV/div setting. With a signal that is 25mV peak to peak, you are only using about 31% of the scope's full scale range. (31% = 25mV / (8divs * 10mV/div). When you change to 50mV division, you are only using 6% of the full scale range. The resolution drops in the same way; the scope is an 8 bit digitizer over the full scale range. 31% of this range is = 0.31*255 = 83 levels; 6% is only about 15 levels. This is what you are seeing in your images; the volts per ADC code increases by a factor of 5 when you change the gain from 10mV to 50mV. Since your signal is small compared to full scale, you don't have much resolution. In general, you always should use as much of the grid as possible to get the best resolution. See LAB WM308 for more information and examples: http://www.lecroy.com/tm/library/LABs/PDF/LAB_WM308.pdf
Note that Scope Explorer can retrieve the volts per ADC code. Go to the Traces screen, right-click on a channel, and choose "Show Trace Properties". For 50/div, the vertical_gain is only 0.00220973 (2.2mV per ADC code). For 10mV/div, the value is 0.000441946 (442uV).
Feel free to contact me for more discussion!
Best Regards,
Alan
Alan Blankman, Technical Product Marketing Manager and LabVIEW Developer
LeCroy Corporation
800-553-2769 x 4412
http://www.lecroy.com
[email protected]

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