GS_GSR_GCR_UserManual_V21.doc / 18.09.2009
GeoSIG Ltd.
GSR / GCR / AS User Manual
Page 25
▪
Download your data to your PC and delete all event files.
The
Memory Read/Write
test writes a 0 and a 1 to every location within the data memory without
corrupting any data, and checks whether there are no stuck bits. A
Warning
appears if it detects any
stuck bits.
▪
Run the Self Test again. If the Warning flag remains set some data memory chips may need to
be replaced. Contact GeoSIG or your local representative.
▪
If you are using a removable Memory Card replace, it with a new card.
The
Memory Format
test checks the data format within the event memory. A failed test causes a
Warning
.
▪
Run the Self Test again. If the Warning flag remains download all event files to your PC and
delete all event files. Run the Self Test again.
The
Memory Present
test monitors on-line the event memory and if no memory is present e.g.
Memory Card is removed, an
Error
will appear.
▪
Insert Memory Card properly.
The
Data Checksum
test determines the checksum of every file stored in the Instrument's memory,
and compares it to the value stored in the file header. The checksum stored in the file header is
calculated during the event; any data corruption in the memory either during or after recording will be
detected and indicated as a
Warning
.
a
Event files with a Warning message in their header may contain some corrupted data. They
should be displayed graphically and critically analysed, to make sure that the data can be used
for analysing.
▪
Download all event files to your PC before deleting them in the Instrument. Run the Self Test
again.
The
Data Consistency
test checks the block ordering of all files in the Instrument’s memory. If any
disordering of blocks is detected, a
Warning
appears.
▪
Download all event files to your PC and delete them all. Run the Self Test.
6.2. Maintenance
The Instrument has been designed in a way that it requires a minimum of maintenance. If the following
procedures are performed frequently, the instrument will last for many years:
•
The periodic test indicates any irregularity as soon as it occurs. Therefore it is recommended, to
check the recorded sensor test at least
once a year
. Compare the signals of the 3 channels with
older records. There should not be a distinctive change.
•
The function of a sensor with DC response (capacitive, piezo-resistive and FB sensors) can be
checked by inclining the sensor in every axis. An inclination of 90° causes an acceleration of 1.0 g,
30° an acceleration of 0.5 g and 14.7° an acceleration of 0.25 g. Check this value for every
channel. This check should be performed
annually.
•
The function of the sensor can be checked frequently with a tilt table. For testing the sensor has to
be installed onto the tilt table. The whole range of ± 1g has to be checked with the table. Every axis
shall be performed. The output signal has to be compared with the calibration values given by the
manufacturer.
A sensor without AC response needs to be checked by using a shaking table. The period of this
check depends on the used sensor type. For detailed information refer to the data sheet of your
sensor.
