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| Rohde & Schwarz Oscilloscopes - Questions/Comments? Let me know! |
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| nctnico:
--- Quote from: sstepane on July 14, 2018, 11:55:13 am ---I have some practical question - what software (better to be free) can be used to analyse RTB stored waveforms? I see RSCommander software from R&S, but it has some very limited analysing abilities for traces (no abilities at all, except for Y-setup). --- End quote --- That depends on what you want to analyse exactly. I've read CSV files produced by an RTM3004 into GNU Octave directly for analysis. In general you should forget about free software provided by the manufacturers. This usually is written by an intern and it can't do anything serious. |
| LaurentR:
The RTB2K datasheet says that the input impedance of the scope is 9 pF ± 2 pF. This is seems outside of the common compensation range of most passive probes on the market (typically 10-20 pF). Am I confused about the specs or this means only very select probes will be able to compensate properly? |
| David Hess:
--- Quote from: LaurentR on July 14, 2018, 04:47:21 pm ---The RTB2K datasheet says that the input impedance of the scope is 9 pF ± 2 pF. This is seems outside of the common compensation range of most passive probes on the market (typically 10-20 pF). Am I confused about the specs or this means only very select probes will be able to compensate properly? --- End quote --- Input capacitance at the oscilloscope limits probe bandwidth so a model which supports up to 300MHz will have a lower input capacitance than a model which only supports up to 100MHz. Higher bandwidth passives probes have a lower capacitance compensation range. This *is* annoying though if you are expecting to be able to use inexpensive 100MHz passive probes. |
| mtdoc:
--- Quote from: sstepane on July 14, 2018, 11:55:13 am ---Hi, I have some practical question - what software (better to be free) can be used to analyse RTB stored waveforms? I see RSCommander software from R&S, but it has some very limited analysing abilities for traces (no abilities at all, except for Y-setup). --- End quote --- I guess it would depend on what you want do with the data. There are numerous software packages that can display and analyze CSV files. As far a “free”goes, there’s the spreadsheet programs included in Libre Office, Open Office, and others. For more science/ engineering /computational focus there’s Octave and SciLab. I’ve used Scilab and it works well as a free alternative to Matlab. I’m sure Octave is good too. For just displaying the waveforms, there are dozens of free programs that will do that for CSV files. Just google “free cvs file graphing software”. |
| LaurentR:
--- Quote from: David Hess on July 14, 2018, 05:13:58 pm --- --- Quote from: LaurentR on July 14, 2018, 04:47:21 pm ---The RTB2K datasheet says that the input impedance of the scope is 9 pF ± 2 pF. This is seems outside of the common compensation range of most passive probes on the market (typically 10-20 pF). Am I confused about the specs or this means only very select probes will be able to compensate properly? --- End quote --- Input capacitance at the oscilloscope limits probe bandwidth so a model which supports up to 300MHz will have a lower input capacitance than a model which only supports up to 100MHz. Higher bandwidth passives probes have a lower capacitance compensation range. This *is* annoying though if you are expecting to be able to use inexpensive 100MHz passive probes. --- End quote --- Thanks. Actually, it is the opposite. I was looking at the small 500MHz probes. The 3.5mm Tek P6139A / Caltest CT3290 (10-20pF) and the 2.5mm Keysight/Testec (also 10-20pF). |
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