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| Rohde & Schwarz Oscilloscopes - Questions/Comments? Let me know! |
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| mtdoc:
--- Quote from: LaurentR on July 14, 2018, 10:53:29 pm --- --- Quote from: mtdoc on July 14, 2018, 08:10:59 pm --- --- Quote from: LaurentR on July 14, 2018, 05:45:10 pm ---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). --- End quote --- The input capacitance of the Tek P6139A and Caltest CT3290RA is 8pF not 10-20. Both have compensation ranges of 8-18pF. I don't now what Keysight/Testec probe you are looking at but for the reasons David Hess explains, I'd be surprised if any 500MHz probe has an input capacitance of 10-20 pF. --- End quote --- Strangely, Tek quotes 8-18pF while Cal Test quotes 10-20 (that's where I got my original number from). --- End quote --- Look at the P6139 manual and CT3290RA datsheet. Both are easily found online and both say 8pF |
| David Hess:
Probe compensation specifications are not rigorous. I was able to go through my cheap 100MHz probes which have a specified compensation range of 10 to 35 picofarads and find a pair which would work with 47 picofarad inputs. None of my 250MHz probes could do this though. |
| 2N3055:
There is discrepancy about specs in documentation. In datasheet it says: "Input impedance R&S®RTB2002, R&S®RTB2004 1 MΩ ± 2 % with 9 pF ± 2 pF (meas.)" , but in brochure it says "Input impedance 1 MΩ ± 2% with 19 pF ± 2 pF (meas.)" Maybe a clarification by R&S ?? |
| nctnico:
19pf seems more likely so I guess the 9pf number is a typo. |
| nctnico:
--- Quote from: 2N3055 on July 14, 2018, 10:45:20 am ---But at this pace, it'll take years... I waited for a 3000 series since last year... Not impressed so far.. I really hope new Rigol DS/MSO7000 shows to be decent performer... They show an app bundle to be 1500€, R&S is 2500€ ... Basic scopes are not very inexpensive but give them time.. --- End quote --- I'd be very amazed if the Rigol 7000 series is anywhere near the level of the R&S RTM3000 series at the introduction. However up to 200MHz there are more economic choices and the advantage of buying Lecroy, Keysight, R&S or Tektronix is minimal at best. |
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