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new killer scope in town - a true game changer from R&S - RTB2002 & RTB2004

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edavid:

--- Quote from: Robaroni on December 18, 2023, 03:40:48 pm ---Okay, thanks for the clarification, I stand corrected but that doesn't change the fact that their tech dept. doesn't have schematics AND probably never has AND they don't have service manuals AND they won't even tell me if the encoder drives a chip on the same board AND they won't even sell me a part if it does!

--- End quote ---

AND you refuse to run the encoder test so you can find out if you even have an encoder problem  |O

Robaroni:
It's an on/off switch to change for fine/coarse and it was the first thing I tested!

Which of course doesn't change one thing I said in my last post.

AND now I have to put it under a microscope and trace the lines but since I found a work around, as annoying as it is, I may not get to for awhile. AND, of course, I still don't know if the service manual does show anything about the horizontal fine/coarse in it because..... wait for it  --- I don't have a service manual! |O

chicken:
The fan on my RTB2004 sounds like it's on the way out. Does anyone have experience with replacing the fan?

Based on the teardown by mikeselectricstuff, the original fan is a Sunon HA80251V4-1000U-G99. I could only find HA80251V4-1000U-A99 in stock, where the suffix A99 is "AutoRestart", and G99 is "AutoRestart and F type (3rd wire)". There's also an R type option (F99).

Octopart suggested CUI CFM-8025V-120-204-20 as equivalent part. The "20" at the end is for "tachometer signal".

Any ideas whether "F type" and "tachometer" are the same?

Are there other recommended replacement fans?

alonsojar:
I did some tests with a Noctua NF-A8 FLX fan that should be compatible with the sunon stock fan, in my case looking for more silent (yes, I'm one of these noise phobics).
You can see some comments here:

https://www.eevblog.com/forum/testgear/rs-rtb2004-noctua-fan-questionsfeedback/msg5001883/#msg5001883

In brief, the fan was working well, but for any reason it runs a bit faster that the sunon in the same conditions, and at the end it was noisier unless you place some resistor in series to slow it, so I left the original one.
Someone has reported here that newer manufactured Rtb2000 are less noisy, and maybe they have another fan model (for instance R&S uses ebm-papst in other stuff).
It should be good if anyone can share any other experience regarding this subject. Let us know the result if you replace the fan...

J. Alonso

skander36:
@alonsojar, personally I consider this scope the most silent device(with fan) I ever had.
You can say that it sleep on the table or his case is squeaky but not that is noisy. But perception is a subjective matter and sound are not making exception. Maybe you are more sensible to some kind of noise.
I am more disturbed by the noise of the laptop fan or the hum of the DMM6500 but not by this scope because his noise has been balanced (it is not too high and not too low).

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