| Products > Test Equipment |
| REVIEW - Rigol DS2072 - First Impressions of the DS2000 series from Rigol |
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| Teneyes:
Here is a CAN Bus Message of 3 Bytes of Data (43,41,4E) I have zoom display of each sections of the Frame for discussion. I will show all sections in this Post then I will highlight points where I have some concerns in additional posts The Display are: ID Frame DATA Length 3 Bytes of Data CRC ACK Between meesage Gap |
| Teneyes:
Here are my comments on the Sampling position of the signal and How the DS2000 displays data. I do not have and experience with analog sigansl with Data decoding. In the first display I show how adjusting the Trigger sample point shifts the Trace and Data relative to the Orange Trigger point.I shoe at 5 %, 50 % and 95% sample point All looks nice and Good. In the second display I show how adjusting the Decode sample point shifts the Trace and Data relative to the Input Trace.I show 3 conditions Trigger at 5 %, and Decode at 95% sample point Trigger at 50% and Decode at 50% sample point Trigger at 95%, and Decode at 5% sample point Here I think I would prefer that the entire Message is shifted and NOT just the Length and DATA. Is this a BUG?? WHat to other DSO's do? What do others think? You will see that the Data overlaps the CRC some times. Just be aware of the shifting , when you are trying to examine trace timing and CAN Data bits good feature of the Copy trigger , is the sample point is copied so Both Trigger and Decode are the same, but if you adjust the Decode , the Trigger point does not Follow. Note this CAN messges was done with Arb Gen., But I am still trying to calculate the Correct CRC |
| AintBigAintClever:
--- Quote from: Teneyes on May 02, 2014, 08:58:13 am --- --- Quote from: AintBigAintClever on May 01, 2014, 08:11:52 pm ---My DS2072A-S works happily on rev. 2.x firmware, signal generator and all. Whatever's been added in 3.x, I don't think A-S support is it. --- End quote --- @AintaBigCleaver :D Did you try FW 00.03.00.01.03 ? or Beta FW=00.03.00.00.00 ? --- End quote --- Skipped the beta. No idea what was on it out-of-the-box (idiot boy forgot to check first!). Tried it on 2.x grab-the-key firmware and 00.03.00.01.03, both of which would allow feature unlocking keys but no bandwidth change keys, so it's on 2.x non-A-keys firmware for now, fully unlocked ;D |
| Teneyes:
Here's a Test to see Frequency tolerance of the Rigol CAN bus Decoding; The base Frequency was set to max. of 1.0Mb/s and the input message bit rate was raised until an Error and then lower until errors. Displays; 1: Good decoding at a higher Bit rate (1.087Mb/s) just before Errors occured 2: No decoding at a higher Bit rate (1.111Mb/s) as Errors occur 3: Good decoding at a lower Bit rate (0.915Mb/s) just before Errors occured 4: Error decoding at a higher Bit rate (0.909Mb/s) as Errors occur So I would say Tolerance is -8.5% to +8.7 % of Baud rate: but I am not sure what the theoretical range is? The timing could be from the the Trigger point, but with 70 bit times there might be re-syncing at the bit change edges |
| Carrington:
--- Quote from: Teneyes on May 03, 2014, 12:27:18 am ---Does anyone know how Agilent deals with displaying CAN data?? Hydrawerk?? --- End quote --- Hi Teneyes. :) The other day I found this video. Is that what you wanted to see? And also I found this video (download to see): http://www.element14.com/community/servlet/JiveServlet/downloadBody/35783-102-2-217111/T%26M-Learning%20Center-Oscilloscopes-Video-Agilent.Training_Videos_6.wmv |
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