- Data Communications Operator's guide Ethernet CMG-DCM

CMG-DCM
• a case-sensitive code for the sensor type (see Appendix B.2, “Digitizer
type codes”);
• a case-sensitive code for the digitizer type (see Appendix B.2, “Digitizer
type codes”);
• the sensitivity of the sensor, prefixed with a V for a sensitivity in V/m/s,
or A for a sensitivity in V/m/s
2
(in the example, around 1 V/m/s). Note
that there is no colon between the sensitivity and its unit.
The sensitivity is given on the sensor's calibration sheet. The sensitivity
of a sensor integrated with a digitizer is quoted as a single-ended
sensitivity, whilst stand-alone digitizers are provided with their
differential sensitivity. A differential sensitivity is quoted as, e.g. 2 ×
3000 V/m/s. In this file, you should use the doubled value, i.e. 6000
V/m/s, for a stand-alone digitizer. For integrated digitizers, you should
use the single-ended value quoted.
• the sensitivity of the digitizer, in volts per count (here 1.6 × 10
-7
V/count
= 0.16 V/count). This is given on the digitizer's calibration sheet.μ
• the decimation sequence code. This is an integer between 0 and 239
which describes the sequence of filters in use by the digitizer. If you
have a recent digitizer (with firmware newer than version 0.91) this
information is included in the incoming GCF streams, so you can leave
this field blank. The codes corresponding to each possible decimation
sequence are available from the support section of the Güralp Systems
Web-site.
When you have finished editing the file, clicking Save changes will write the
changes to disk. The changes will not take effect, however, until the SEED
service is restarted. You can restart the SEED volume generator by clicking
Restart SEED recorder.
64 Issue A