Guralp Systems CMG-5T Compact - Manual (Page 10)

CMG-5T Compact
3. Adjust the vertical screw until the output voltage reads zero.
4. Repeat steps 2 and 3 for the N/S and E/W channels, (with the
meter connected across pins C/D and E/F respectively).
5. If necessary, continue to adjust each channel in turn until
consistent results are obtained on all three channels.
6. Repeat steps 2 to 5 using the high-gain outputs, if available and
refine the settings as far as possible. The high gain outputs for the
vertical, N/S and E/W channels appear across pins S/T, Z/a and
H/K respectively, as shown in section 5 on page 24.
7. Ensure that the “O”-ring seal on the adjuster screw cap is present
and intact and replace the cap firmly, to keep the instrument's
electronics protected from water and dust.
After the cover is installed, the accelerometer outputs may drift until the
system establishes temperature equilibrium with its environment and
the sensor settles down in its position. If required, the offset adjustment
can be repeated to achieve a better output offset. With experience, it
should be possible to reduce the output level to less than ± 1 mV.
2.4.2 Removing offsets using a terminal connection
Note: this method will only work for the instrument connected to the
sensor A port on a digitiser.
Open a terminal window for the required sensor and enter the
command:
CENTRE MONITOR
or
CENTER MONITOR
10 Issue E