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I can't source as low noise signal as expected from the B2961A/B2962A with the Ultra Low Noise Filter.

The connection between the output terminals of B2961A/B2962A and the Ultra Low Noise Filter (ULNF) is tight so that the ULNF should be pushed into the output terminals strongly. Besides, it is required to enable the ULNF on the GUI of the instrument.

Please see the following material for the details.
How to attach and enable the ULNF on B2961A/B2962A