Figure 2
Subtypes of baseline pressure errors (BPEs). Illustration of the three types of BPEs: (a) Type 1: Constant BPE. (b) Type 2: BPE related to sudden shift in baseline pressure. (c) Type 3: BPE related to gradual drift of baseline pressure. While type 1 can be caused by wrong calibration from the manufacturer, or user-dependent erroneous zeroing, types 2 and 3 can be caused by electrostatic discharges, or various other causes.