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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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