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Rohde & Schwarz Oscilloscopes - Questions/Comments? Let me know!
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2N3055:

--- 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 ---

Octave and Scilab...
mtdoc:

--- 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.
nctnico:

--- 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 ---
Interestingly the RTM3004 (500 MHz 1Mh Ohm inputs) has a capacitance of 14pf so it caters for most probes. When dealing with high-Z probes the input capacitance doesn't matter much because it becomes part of the capacitive divider anway. It also shows that the probe itself will have a very high loading of the signal. I never use high-Z probes on signals over 100MHz because the signal will be loaded way too much to make a sensible measurement.
MikeP:

--- Quote from: glowman on July 14, 2018, 05:54:24 am ---Hardware wise, they have to be very careful in choosing OEMs who can provide the level of quality.  1 of 4 probes of my RTB2004 has loose connection on the x1x10 switch.  These small quirks could really affect the overall reputation of R&S.

--- End quote ---

 +1. Moreover, one of the probes is shorter by almost one centimeter. Once I was very puzzled.  :wtf:
LaurentR:

--- 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).

Also, for the Keysght/Testec probe, I am thinking of the N2873A. It claims 10-25 pF on the Keysight datasheet https://literature.cdn.keysight.com/litweb/pdf/5990-3930EN.pdf?id=1711400
What I believe is the same probe (Testec 12070RA/TT-HF 612 or RS Pro RS-HF 612RA) is quoted by Testec and RS-Pro as 10-20pF http://cdn-reichelt.de/documents/datenblatt/D100/TT_HF_612.pdf
It also looks the same (in black) as the Lecroy PP023, also quoted as 10-20pF
Not 100% sure if it's also the R&S ZP10.

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