Products > Test Equipment
Rohde & Schwarz Oscilloscopes - Questions/Comments? Let me know!
<< < (60/75) > >>
2N3055:

--- Quote from: mtdoc on July 15, 2018, 07:17:29 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 ---

The discussion here had me curios, so I did some testing:

I meausured the input capacitance of my RTB2004 with my DE-5000 LCR meter and got 10pF.

I was easily able to properly compensate multiple oscilloscope probes I have laying around including:

Tek p6106, p6136 and p6137 probes and several different cheap chinese probes I had laying around including the ubiquitous p6100.

All had no problem being adjusted to proper compensation.

Interestingly, the 300 MHz RT-ZP03 probes supplied with the scope have a specified input capacitance of 12pF but there is no compensation range specified on the datasheet.

So as David Hess says, probe compensation specs are not rigorous.

Any of the probes you're looking at will work fine the the RTB2004.

--- End quote ---

That's a good work! Thanks for that, now we know. So it is 9pF...

David Hess:
Lower oscilloscope input capacitance has obvious advantages but it also comes at a price.  The smaller gate geometry FETs needed have higher noise and the lower capacitance also makes input protection circuits more difficult.  Some active probes leave out input protection entirely in the quest for the lowest possible input capacitance but they are very easily damaged by ESD.

10 picofarads for a 300 MHz input strikes me as a little extreme but maybe Rohde & Schwarz is reusing the input circuits from their 500 MHz instruments or wants to share probes with them. 

Such a low input capacitance does make probe design easier though.

One thing I miss on newer oscilloscopes is being able to adjust the input capacitance so I can swap probes around without adjusting compensation.

glowman:
Just checked the firmware page for RTB2000 minutes ago and found out the new 2.121 is now there.  However, the release notes, etc. has 2.101 as the label although upon checking the release note, it is the new 2.121. :wtf:  There is really something wrong with these people... If they are that careless, what can you expect with regards to the quality of their products in general.  No wonder you could easily find bugs.  Seems like they never do debugging and hassle their users to find them.  I was tempted to ask... is this R&S Germany?

Whether its the fault of their web administrator or the firmware engineers, it affects R&S as a whole.  Kindly please get your act together.

PS. If you refresh the page several times, firmware 2.000 may appear but, if you're lucky to see the 2.101, it's the 2.121... funny.
hwj-d:
@glowman,
be patient, give them a chance to make it a good work and product; they work on it.
(There are other products from other big companies, they annoys me more, in the moment.)

 ;)
nctnico:

--- Quote from: glowman on July 16, 2018, 03:42:45 am ---Just checked the firmware page for RTB2000 minutes ago and found out the new 2.121 is now there.  However, the release notes, etc. has 2.101 as the label although upon checking the release note, it is the new 2.121. :wtf:  There is really something wrong with these people... If they are that careless, what can you expect with regards to the quality of their products in general.  No wonder you could easily find bugs.  Seems like they never do debugging and hassle their users to find them.  I was tempted to ask... is this R&S Germany?

Whether its the fault of their web administrator or the firmware engineers, it affects R&S as a whole.  Kindly please get your act together.

PS. If you refresh the page several times, firmware 2.000 may appear but, if you're lucky to see the 2.101, it's the 2.121... funny.

--- End quote ---
I suspect this is Cloudflare messing things up in combination with the wrong caching settings on the web server. Removing something from internet can be hard especially with caching web proxies in between.
Navigation
Message Index
Next page
Previous page
There was an error while thanking
Thanking...

Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod