Products > Test Equipment
Rohde & Schwarz CMU200
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William:
I have the same (problem 2 watt on a what shoud be 50 Watt on a 1100-0008-30

Did you solve it and would you like to share a solution. or is a .02 simple the better solution, i still can switch.
Regards William

ps:
50 W input capability requires a big 50 termination resistor inside the RF frontend, plus some nice heatsink fins at the bottom of this module. There is an optional second RF generator, that sits exactly at this position. Option B95 or 96 or something like this. So whenever this second generator is present, you do not have the heatsink and therefore cannot use the 50 W.
RBBVNL9:

--- Quote ---50 W input capability requires a big 50 termination resistor inside the RF frontend, plus some nice heatsink fins at the bottom of this module. There is an optional second RF generator, that sits exactly at this position. Option B95 or 96 or something like this. So whenever this second generator is present, you do not have the heatsink and therefore cannot use the 50 W.
--- End quote ---

That is indeed true. The below picture (from the video I talked about here earlier) shows the input power levels of the CMU200 on the four CMU200 inputs, and how they depend on the various options installed.

The RF1 input power depends on option B95 or B96, but also on 'option' U99 (sometimes also called B99). I put option in brackets because this one is more a downgrade than an upgrade of the instrument...
ps:
U99 is a modification ("Umbau") required to install B95/96. This is more or less removing the heat sink. U99 is always present if you have the B95/96 option, whether it was specifically mentioned or not.

If you order U99 without adding B95/96 (why should someone do this?), it is called B99.
RBBVNL9:

--- Quote ---U99 is a modification ("Umbau") required to install B95/96. This is more or less removing the heat sink. U99 is always present if you have the B95/96 option, whether it was specifically mentioned or not.
--- End quote ---

Thanks for sharing that, now we know where the "U" and "B" come from ;-)


--- Quote ---If you order U99 without adding B95/96 (why should someone do this?), it is called B99.
--- End quote ---

I also wonder why someone would do that.... But it does happen: one of my three units has B99, but does not have B95 or B96. This is the worst configuration; perhaps it was cheaper?!?
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