Bulletin of the Seismological Society of America; February 2006; v. 96; no. 1;
p. 258-271; DOI: 10.1785/0120050032
© Seismological Society of America
Click on image to view larger version.

Figure 8. Digitizer models for the Q4120 and NARS dataloggers (at 20
samples/ sec), compared with the NLNM convolved with a noise-free
sensor with a flat velocity response and a gain of 1500 V/m/sec (NL0), a
noise-free STS-1 sensor (NL1), and a noise-free STS-2 sensor (NL2). The
PSDs are relative to 1 V2/Hz. The figure
visualizes for which frequencies the digitizer can be used without
precaution.