Products > Test Equipment
Rohde & Schwarz CMU200
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pdenisowski:

--- Quote from: richnormand on March 28, 2023, 04:31:01 pm ---Appreciate your videos, please continue the good work.

--- End quote ---

Yes, those are really great videos - thanks @rbbvnl9 for making them!

Glad to see the CMU is still being used:  we made (literally) tens of thousands of them.  There was even one on display at the Deutsches Museuem in Munich at one point :)
RBBVNL9:
Dear all, thanks for the compliments. Positive feedback is helping me to keep going on this ;-)

Concerning hardware…


--- Quote ---CMU200 as a spectrum analyzer would be the best video to do  :-+
--- End quote ---

Certainly. It's in my planning!


--- Quote ---Also. how about a video for installation of the B17 I/Q IF interface option module.
--- End quote ---

Also planned ;-) Have already bought this module a couple of months ago, which I will use for this!

But it may take a moment; currently I am working for a while in Japan, and travelling around that country. 

Concerning software…

Now, here is where it gets a bit more complicated. My current thinking is to test the following:

* Remote Service Tool V1.7.1 (by R&S)
* FreRes (by R&S)
* CMUgo (by R&S)
* VMA Spectrum Analyzer (by Vitor)
The issue is that I do not get these all to work. I purchased a Keysight/Agilent 82357B USB/GPIB Interface and installed the Keysight IO Libraries Suite 15 on a contemporary PC running Windows 10. I think this Keysight solution is a rather common one, and also the documentation of R&S on this usually refers to the Keysight IO Libraries as one of the supported options, if not the preferred connection option. While the Keysight IO Libraries Suite 15 perfectly sees all my CMU’s and other GPIB devices, I struggle with the above software to get it connected in the first place (FreRes) or working properly (the others).

When I get back from Japan and have time to test this a bit more, I will post a more specific post in the already existing FreRes thread. But what is not helping either is that (1) that R&S only seems to post older versions of this software on the website (v3.22 is here), but I know the newest one is at least 5.3.0; (2) the four R&S FreRes manuals I managed to find are different in terms of compatibility requirements listed, but these manuals do no state to which software version they correspond (and adding to the difficulty is that that two rather difference manuals have the same reference (1MA09_4E) ?!?

Perhaps the issues relate to using a much later Windows version than that was available when this software was developed, so I am considering to also set up a much older PC (Windows XP?) as a kind of sandbox and installing the Keysight IO Libraries in an older version (e.g., from the CD that shipped with the GPIB interface) to see whether that gives more luck…

Best, Rudi
Bicurico:
Hello Rudi,

Drop me an email and I will help you with the connection.

Also, on my blog you will find an entry on how to configure everything. Note that you need to run FW starting with 4.xx to be able to connect and you need to configure primary and secondary address.

Regards,
Vitor
RBBVNL9:
Dear Vitor,

I did manage to get VMA Spectrum Analyzer running - I should have been more clear on this. Really like it, especially the waterfall plot, allowing to see certain patterns for time-dependent signals. Only wish the waterfall could be shown larger ;-)

Best, Rudi
RBBVNL9:
The CMU200 can output its screen to an external VGA monitor – fairly standard 640 x 480 pixels mode – and senses at boot whether such a monitor is connected; otherwise, this output remains disabled.

I have several CMUs and want to use a ‘mechanical’ VGA switch to select which CMUs screen to show on a monitor (and at the same time send it to a video-grabbing device). Because of the sensing part, my current procedure is rather cumbersome: I need to select each CMU one by one on the VGA switch, have it boot up, then go to the next one, etc. I would rather be able to turn all CMUs and make them all believe there is a monitor connected.

Doing some quick search, I understand that, over time, different methods were used to sense a monitor via VGA:
-   A resistance of 75 ohms between each video output line (R, G, B) to ground.
-   Connect any (combination) of the Monitor ID Bits (pin 11, 12, and 15 for bit0, bit1 and bit2, respectively).
-   An I2C signal (SDA on pin 12, SLC on pin 15), used by the VGA Video BIOS to access a 128 byte or 256 byte serial EEPROM memory in the monitor to determine its specifications.

 Before I go into measuring and digging this out, is there anyone that knows how the CMU senses the presence of a monitor? If yes, that would be quite helpful…

I have a bit of the same question for my AMU200A. It has a more advanced video card than the CMU, and runs Windows XP Embedded, and may or may not sense the monitor the same way as the CMU does…

Thanks! Rudi

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