GeoSIG AS-12, Руководство пользователя

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GeoSIG Ltd. GS_GSR_GCR_UserManual_V21.doc / 18.09.2009
Page 20 GSR / GCR / AS User Manual
5.4.2. Recording Capacity
The recording capacity is related to various factors such as the sampling rate, the amplitude of the
signals, the number of recorded events, and the amount of memory installed in the Instrument. Used
memory may be approximated by the following formula, which illustrates an example calculation for 30
minutes long, one channel data at 200 SPS:
[ ] [ ]
{ }
Samples bytes Sample sec onds
200 3 30 min utes 60 1024 header bytes
Kbytes
sec ond Channel min ute
1055
bytes
Channel
1024
Kbyte
× × × +
=
⎡ ⎤ ⎡ ⎤ ⎡ ⎤
⎢ ⎥ ⎢ ⎥ ⎢ ⎥
⎣ ⎦ ⎣ ⎦ ⎣ ⎦
⎡ ⎤
⎢ ⎥
⎣ ⎦
a
65’000 is the maximum number of events, which may be recorded, regardless of the memory
size.
5.4.3. Intensity Scale
a
Only newer GSR-18 instruments with firmware versions 02.02.22 and higher as well as
firmware versions 02.04.05 and higher have a build-in intensity scale.
Earlier firmware versions as well as GSR-12 / 16 Instruments had an Intensity Scale, which is
not anymore supported. This information is given for the completeness in defining the Intensity
Scale for GSR-18.
The user had the possibility to see an “Intensity Scale” on the LCD for every event. The scale
was defined as follows:
Scale
Intensity [gal]
0 < 0.8
1 0.8 2.5
2 2.5 8.0
3 8.0 25
4 25 80
5 80 250
6 > 250
where 1 [gal] = 1 [cm/s
2
]
The below description is the actual Intensity Scale that is used only in GSR-18 Instruments.
The Intensity Scale is manually configurable within GeoDAS. The maximum acceleration level can be
set to the corresponding intensity as well as the intensity indication style that can be chosen to be in
Latin or Roman notation. The maximum number of levels is extended to 12 whereas not all of them
have to be used. Unspecified levels of high intensities are set to zero.
The intensity scale can be displayed on the LCD for every event. Every event gets a chronologically
incrementing identification number to distinguish it on the display. In GeoDAS the intensity is visible for
every event as well.
The Intensity Scale is displayed for events recorded in [gal], [mg] or [g]. The Instrument converts the
Intensity Scale to actual measuring units for displaying intensity. If another measuring unit is used, the
Instrument displays “NA”, which means Not Applicable.
5.5. Clock
The Instrument has a complete, self-contained time-keeping system. This clock keeps track of days,
hours, minutes and seconds. The instrument has the ability to set the clock to the current time
manually, or to set the time and synchronise the clock automatically with an encoded external time
signal. The clock operates from the internal battery and runs regardless whether the Main Switch is at
ON or OFF position.