Guralp Systems CMG-5TD User Manual

Page 35

Calibration

9. Most data can be found on the calibration sheet for your sensor. Under

Instrument response, you should fill in the sensor response code for

your sensor, according to the table below. Instrument Type should be
set to the model number of the sensor.

10. If the file calvals.txt exists in the same directory as Scream!'s

executable (scream.exe), Scream! will look there for suitable

calibration values. A sample calvals.txt is supplied with Scream!,
which you can edit to your requirements. Each stream has its own

section in the file, headed by the line [instrumentid]. The
instrumentid is the string which identifies the digitizer in the

left-hand pane, e.g. GURALP-DEMO. It is always 6 characters or fewer
(the system identifier) followed by a dash, then 4 characters or fewer

(the serial number). For example:

[DEMO00-4V99]

Serial-Nos=T4V99
VPC=3.153

G=1010
COILCONST=0.02575

CALVPC=3.161
CALRES=51000

TYPE=sensor-type
RESPONSE=response-code

11. Click

. The script will return with a graph showing the response

of the sensor in terms of amplitude and phase plots for each

component.