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| Most affordable oscilloscope capable of color graded eye diagram? |
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| graybeard:
My Siglent SDS1104X-E does a acceptable job of color grading, but is a bit slow for eye diagrams. It was ~$500 and I hacked to to 200 MHz. The best one for color grading I own is my 1 GHz Tektronix TDS784D. I paid $780 including shipping with a LCD screen. The color graded display on this one is beautiful. |
| tautech:
Not sure if this is done right. :-// SDS1104X-E CAN H and L from a STB3 Trigger set to one or the the other and H Pos moved to center the packets on the display. Min Holdoff. Screenshots should say the rest........... |
| tautech:
Seems like with a CAN signal there might be no need for a clock signal to trigger on. The $399 SDS1104X-U |
| nctnico:
--- Quote from: 2N3055 on March 07, 2021, 11:46:38 am --- --- Quote from: nctnico on March 07, 2021, 10:56:02 am --- --- Quote from: entropi on March 07, 2021, 12:28:37 am ---Either new or vintage, what are the most affordable scopes capable of a color graded eye pattern generation? This is a very cool feature and I’m just curious how attainable it is these days. --- End quote --- What kind of signals do you want to look at? If you want to look at high frequency stuff then the trigger-jitter and implementation of the trigger become important (some DSOs concentrate the trigger point digitally into a single point which causes the edges to smear out more than they actually are). The price of vintage depends on state & age. With some homework to avoid wrecks you can buy an older fixer-upper 1GHz+ oscilloscope for a couple of hundred US$. Usually there are a whole bunch of Lecroys with TFT screens for sale on Ebay. --- End quote --- Most of the jitter/eye analysis on deep memory scopes is not relying on trigger information at all. It recovers clock info from signal itself and does it's own edge and period extraction from the capture itself, and then overlaps such "chopped up" pieces to create eye diagram... Trigger simply serves for reasonable signal acquisition. Trigger jitter is important only if you create eye manually by using physical signal+clock method. --- End quote --- With eye pattern analysis you go one step further and reduce the number of availble oscilloscopes to choose from. It is also a rather specialised purpose which gets outdated quickly with ever increasing signalling speeds. If you want to see how stable an oscillator is, compare 1PPS pulses or how much jitter comes from a DDS then using the trigger is a good enough method (even better with some added statistics) for showing the time difference between the edges. |
| 2N3055:
--- Quote from: nctnico on March 07, 2021, 10:58:08 pm --- --- Quote from: 2N3055 on March 07, 2021, 11:46:38 am --- --- Quote from: nctnico on March 07, 2021, 10:56:02 am --- --- Quote from: entropi on March 07, 2021, 12:28:37 am ---Either new or vintage, what are the most affordable scopes capable of a color graded eye pattern generation? This is a very cool feature and I’m just curious how attainable it is these days. --- End quote --- What kind of signals do you want to look at? If you want to look at high frequency stuff then the trigger-jitter and implementation of the trigger become important (some DSOs concentrate the trigger point digitally into a single point which causes the edges to smear out more than they actually are). The price of vintage depends on state & age. With some homework to avoid wrecks you can buy an older fixer-upper 1GHz+ oscilloscope for a couple of hundred US$. Usually there are a whole bunch of Lecroys with TFT screens for sale on Ebay. --- End quote --- Most of the jitter/eye analysis on deep memory scopes is not relying on trigger information at all. It recovers clock info from signal itself and does it's own edge and period extraction from the capture itself, and then overlaps such "chopped up" pieces to create eye diagram... Trigger simply serves for reasonable signal acquisition. Trigger jitter is important only if you create eye manually by using physical signal+clock method. --- End quote --- With eye pattern analysis you go one step further and reduce the number of availble oscilloscopes to choose from. It is also a rather specialised purpose which gets outdated quickly with ever increasing signalling speeds. If you want to see how stable an oscillator is, compare 1PPS pulses or how much jitter comes from a DDS then using the trigger is a good enough method (even better with some added statistics) for showing the time difference between the edges. --- End quote --- Well this is literally what OP asked about.. Creation of color graded eye diagrams... Not phase noise analysis. Unless you have a source clock at twice the frequency of your watched signal, a clock recovery needs to done, and for that he can either create/acquire a hardware based clock recovery device to trigger scope or a scope (device) that takes your signal and does clock recovery internally. In scopes clock recovery is exclusively done by software extraction (software PLL), and those are available inside various Jitter/eye diagram packages, usually combined together.. OP didn't really specify anything, or hinted what would that be for, except stating that eye diagrams look cool.. So unless he does, we cannot give any real advice here, methink.... Regards, |
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