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How to product a arbitrary waveform with 1uV amplitude?

Question asked by alex-emc on Sep 22, 2011
Latest reply on Sep 30, 2011 by alex-emc
Dear All ,
     One of my customer want to create a arbitraty waveform ,and the frequency range from 1Hz to 100kHz ,and the amplitude is as low as 1uV? How to do it?
     I have tried to attenuate the output signal of 33220A with an attenuator ,but the result I got is Noise ,so I do not konw how to do it? Is there somebody can give me some suggestion? such as new device or new method?  Thanks a lot