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| Oscilloscope input noise comparison |
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| maxwell3e10:
Here is a comparison of the LeCroy HDO scope with the R&S RTM scope. On the LeCroy scope the noise is identical for 1 MOhm and 50 Ohm paths. |
| ci11:
@maxwell3e10 Thanks for the comparison - would you mind adding the RTM 20MHz BW plots to the LeCroy HDO4032 vs.RTM 3004 chart? |
| JPortici:
what's that peak? at.... 625MHz? only with 1Meg? |
| ci11:
--- Quote from: JPortici on November 15, 2018, 09:37:37 pm ---what's that peak? at.... 625MHz? only with 1Meg? --- End quote --- Sorry - cannot tell you. Same peak at 625MHz shows up in both 50R and 1M FFTs. Probably something LeCroy put in to deter overusing the BW actually paid for, but keep the roll-off gentle to reduce outband noise. |
| JPortici:
My first guess is that it's correlated with the sampling clock (2.5GS/s -> 4 interleaved ADCs at 625MS/s) that wouldn't be so strange but geez.. i would have expected better. Shall i power up my ancient boat anchor and try to get some data, just for kicks :)? |
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