Guralp Systems CMG-DM24S12AMS User Manual
Page 70
CMG-DM24S12AMS Operator's guide
11.Calibrate ports CH3 and CH4 in the same way, but with the N/S
calibration channel selected. You must wait for the previous
calibration to finish before doing this: clicking Inject now has no
effect whilst the Calibration enable relay is open.
12.Calibrate ports CH5 and CH6 in the same way, but with the E/W
calibration channel selected.
13.Close the window and right-click on the second internal
digitiser's icon. Select Control... and open the Calibration pane.
14.Repeat steps 2 – 11 to calibrate ports CH7 – 12 in pairs: CH7 and
CH8 on the Z channel, CH9 and CH10 on the N/S channel, and
CH11 and CH12 on the E/W channel.
If you prefer, you can inject your own signals into the system at any
point (together with a Calibration enable signal, if required) to provide
independent measurements, and to check that the voltages around the
calibration loop are consistent. For reference, a DM24-series digitiser
will generate a calibration signal of around 16000 counts / 4 V when set
to 100% (sine-wave or step), and around 10000 counts / 2.5 V when set to
50%.
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