Guralp Systems ART - Manual (Page 8)

ART
number (as given by the first four characters of the Stream ID)
for the digitizer which produces the data stream.
For example: to add calibration information for a digitizer with
System ID GURALP outputting streams DEMOZ2, DEMON2,
DEMOE2, etc., you would add a section beginning with the line
[GURALP­DEMO]
If you move an instrument from one digitizer to another, you
will need to update the calvals.txt file to reflect the change.
• To set the serial number of the instrument, include the
line
Serial­Nos=serial­number
• Scream! cannot tell what instrument is connected to the
digitizer. This line is provided to help you remember
which set of calibration values you have used, and to
provide a title for calibration graphs. If you attach a
different instrument to the same digitizer, you will need
to enter new calibration values to reflect the new
instrument.
• To set the sensitivity of the digitizer, include the line
VPC=sensitivity
VPC stands for voltage per count, measured in units of
μV/count. This is sometimes given as μV/Bit on the digitizer
calibration sheet.
• To set the sensitivity of the calibration channel, include
the line
CALVPC=sensitivity
as for the other digitizer channels.
• To set the value of the calibration resistor, include the
line
CALRES=resistance
Güralp Systems digitizers normally use a 51 kΩ resistor
(CALRES=51000).
• To set the sensor type, include the line
8 Issue C