Hello,

I own two 2048-bin evaluation boards, bought roughly within one year (I assume no major hardware changes). The slightly newer board (sn 3102) was kept as a spare and it's performance was never fully evaluated after purchase. Now I am comparing the performance of the two boards and the newer one shows worse noise performance, despite calibrations and exactly the same working conditions (the same USB cable and port, floating inputs, firmware rev.).

Do you have any suggestions where to look for the source of such behaviour - both in the electronics and the software?

Thank you in advance for any help.

Krzysztof

PS: Measured the base frequency of the noise to be 1/512 of the sampling frequency (for 4.726 and 4.092 GHz sf). Some FPGA issue?