Guralp Systems CMG-DM24S12AMS - Manual (Page 34)

CMG-DM24S12AMS Operator's guide
Calibration
The analogue links between the DM24S12AMS and the sensors must be
calibrated before you can use them, since the strength of the signal they
output can vary. The Calibration pane allows you to do this once the
sensors are installed.
Each channel Z, N/S and E/W can be calibrated separately. For triaxial
digital instruments attached to the DM24S12AMS's DIGITAL A – F
sockets, each channel calibrates the corresponding axis of the
instrument; simply select one of the Z, N/S and E/W check boxes to
calibrate that axis.
The DM24S12AMS's two internal digitisers can also be calibrated. For
the first (“Digitiser A”), the Z channel sends calibration signals to both
CH 1 and CH 2, whilst N/S is connected to CH 3 and CH 4, E/W being
linked to CH 5 and CH 6. For the second (“Digitiser B”), Z calibrates CH
7 and CH 8, N/S calibrates CH 9 and CH 10, and E/W calibrates CH 11
and CH 12.
The sensors respond to calibration signals on the Mux channel ME.
The Duration box tells the digitiser how long to provide the calibration
signal before disconnecting. This avoids the system being inadvertently
34 Issue B