SAIC Exploranium – GR-135 System Manual page: 29
9.0 DATA MEMORY
If this is selected a new menu appears :
Fig. 25
9.1 STATUS
Selecting STATUS shows the current state of the data memory. The
GR-135 can store data from the 2 operational modes
(SEARCH+DOSE and IDENTIFY) in different formats. Each set of
data is tagged with a special header that identifies the type of data.
The SEARCH+DOSE data are classified as SAMPLES and IDENTIFY
data are classified as SPECTRA.
STORED - This indicates the current status of data storage.
Fig. 26
SPACE AVAILABLE - This indicates available space for additional sample or spectral data.
9.1.1 MEMORY SPACE
The SEARCH+DOSE data are stored in a fixed data forma. For all data storage, the header is
written to memory first and then each data sample is recorded separately.
The header is 47 bytes in size and each sample is 8 bytes. Thus, a 10 sample record contains,
Header 47 bytes
10xSample (8) 80 bytes
Checksum 1 byte
TOTAL 128 bytes
Therefore, the amount of memory space occupied by data is a function of how many samples are
recorded. The system automatically computes available space based on this information but
considers the presence of only one set of header information and the rest being data. If the user
takes separate sets of readings (i.e. more than one header) the number of samples required to fill
the data memory will be less than that calculated by the GR-135 due to the memory requirement for
the extra headers. Therefore, the available memory display data should be used only as a guide.
The IDENTIFY mode records data in a much larger format as each reading is a 1024 channel
spectrum with 2 bytes/channel stored as follows:
Header 47 bytes
1 spectrum 2048 bytes
Checksum 1 byte
TOTAL 2096 bytes
STATUS
DUMP
ERASE
MEM SCAN
MAIN MENU
DATA MEMORY
STORED
SAMPLES 0
SPECTRA 0
SPACE AVAILABLE
SAMPLES 39313
SPECTRA 187
ENTER TO CONTINUE
STATUS
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