Guralp Systems CMG-5T - Manual (Page 11)

Operator's Guide
The primary gain block of the 5T is normally set at × 1 (unity). If
higher sensitivity is required, the gain of the instrument can be altered
by inserting gain-setting resistors onto the power supply board of the
unit:
If G is the gain change you require, then the value of the resistors to
insert is given by the formula
R = 10000 / (G – 1)
Care must be taken when soldering these resistors to the circuit board,
as overheating the terminal could easily damage surrounding circuit
elements.
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