The actual synthetic random voltage (E/Hz) required to drive the vibration
system to the required random spectrum level is determined by multiplying the
sine transfer function by the required test spectrum:

E/g x g/Hz x E/Hz

Utilizing the logarithmic form (dB) the required random
spectrum (column (H) of Figure
4-3) should be added to the tabulated sine transfer functions (column (G)
Figure
4-3). This will yield the resultant synthetic random voltage necessary for
each individual filter bandwidth. (column I of Figure
4-3). This data is plotted graphically in Figure 4-7.