User`s guide

Table B-2. SDF_FILE_HDR (File Header record), continued
Field
Index
Binary
Index*
Field Name/Description
Data
Type
Range/
Units
10 27:28 num_of_VECTOR_record — total Vector Header records. short 0:32767
11 29:30 num_of_CHANNEL_record — total Channel Header
records.
short 0:32767
12 31:32 num_of_UNIQUE_record — total Unique records. short 0:32767
13 33:34 num_of_SCAN_STRUCT_record — total Scan Structure
records.
short 0:1
14 35:36 num_of_XDATA_record — total X-axis Data records. short 0:1
15 37:40 offset_of_DATA_HDR_record — first Data Header
record’s
byte offset from beginning of file.
long
−1:(2
31
) 1
16 41:44 offset_of_VECTOR_record — first Vector Header record’s
byte
offset from beginning of file.
long
−1:(2
31
) 1
17 45:48 offset_of_CHANNEL_record — first Channel Header
record’s
byte offset from beginning of file.
long
−1:(2
31
) 1
18 49:52
offset_of_UNIQUE_record — first Unique record’s byte
offset
from beginning of file.
long
−1:(2
31
) 1
19 53:56 offset_of_SCAN_STRUCT_record — Scan Structure
record’s
byte offset from beginning of file.
long
−1:(2
31
) 1
20 57:60 offset_of_XDATA_record — X-axis Data record’s byte
offset
from beginning of file.
long
−1:(2
31
) 1
21 61:64 offset_of_YDATA_record — Y-axis Data record’s byte
offset
from beginning of file.
long
−1:(2
31
) 1
22 65:66 num_of_SCAN_BIG_RECORD — total of
SDF_SCAN_BIG and SDF_SCAN_VAR records.
short 0:32767
23 67:68 num_of_COMMENT_record — total of
SDF_COMMENT_HDR records.
short 0:32767
24 69:72
offset_of_SCAN_BIG_record — the offset (from
beginning of file) of the first Scan Big or Scan Variable
record.
long
−1:(2
31
) 1
25 73:76 offset_of_next_SDF_FILE — allows more than one logical
SDFFILEinaphysicalfile.
This supports multiple independent results taken at the
same time. (For example, a time capture where the span
and center frequencies of each channel are completely
unrelated.) This offset points to the FORMAT_STRUCT
record of the next logical SDF FILE in this physical file.
All offsets in the next SDF FILE are relative to the start of
the FORMAT field of the logical file (that is, ‘’B’’
followedby‘’\0’’).
long
−1:(2
31
)−1
Standard Data Format (SDF)
B-9