Maybe something that could dampen the fluctuation down so we get an average reading.

Is anything like that available we could plug onto the BNC before plugging into the Pico

We are measuring the voltages across two resistors on a piece of equipment in our facility the problem is we are getting about 20mV inteference either from the laptop even when unplugged or via the picoscope itself as measuring the same point (at the ends of the bnc connectors that plug into the pic...