4 re-centring – Guralp Systems CMG-6TC User Manual
Page 9
Setting up the CMG-6TC
3.4
Re-centring
The CMG-6TC automatically centres its masses at power up and
should not normally require re-centring. If however, the sensor's
position changes due to earth movement or if the ambient
temperature changes dramatically, re-centring can be triggered by
connecting pin U to pin Y:
•
If pin U is connected to pin Y for between one and five seconds,
the processor will switch temporarily to one-second response
mode and check the mass positions. If they average more than
25% of full-scale, automatic re-centring is initiated.
•
If pin U is connected to pin Y for between five and ten seconds,
the processor will check the mass positions in the currently
selected response mode and initiate automatic re-centring if
they average more than 25% of full-scale.
7
Issue C - February 2015