So we're just driving round peak to peak, seeing if we can spot them.

The relation between "noise level" expressed in peak-to-peak is given by S2 pp = 8No(f2-fl), where Spp is the peak-to-peak value of the signal (e.g., nanoteslas), No is the power spectral density (e.g., (nanotesla)2/Hz) and (f2-fl) defines the bandwidth of interest.

6.5.6.13.3.1 The IBC shall be placed in the center of the test machine platform with a vertical sinusoidal, double amplitude (peak-to peak displacement) of 25 mm ± 5%. If necessary, restraining devices shall be attached to the platform to prevent the specimen from moving horizontally off the platform without restricting vertical movement.