vibration pickup and signal generator outputs. The outer knob is used for coarse
adjustments, and the inner knob is used for fine adjustments. Both adjustments are
used to center the null meter pointer. Additional controls and accessories located
on the meter panel are as follows:
Pickup input phone jack--feeds the pickup input to the meter panel.
AC output phone
Pickup/signal generator selector switch--allows selection
either the signal generator or the vibration pickup.
Null indicator meter--used to determine when the pickup output and signal
generator output are balanced. The meter is most sensitive in the center
Sensitivity control--adjusts signal generator output across null indicator
Pickup Calibrator Front Panel