PXIe-5663e block diagram

Hello,
I have a question regarding the block diagram of the VSA 5663e, in particular of the 5601 RF Downconverter (see attached file).
There is an amplifier that can be switched on, but I can't find any means of controlling this PA manually. Is it meant to be a preamplifier?
Is this PA switched on automatically by software? If yes, under what conditions? There seems to be no way to retreive the status of the PA from the instrument.
Thanks
Attachments:
5663e.png ‏50 KB

HI HansAnders,
the only thing you can direclty set is the reference level. You should use the smallest possible level you can (depending on your signal).
Than you have the possibility to change some other settings, so the amplifier will be turned on (or off). I have here two documents which explains how to do that:
Attenuation of the 5663
Downconverter Gain
Unfortunatly I dont have any information about when it is turn on exactly. So this you will have to try. But you will see when you set the attenuation on manual and to zero your noise will be reduced.
I hope this helps,
RMathews

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