User`s guide

Table B-3a. SDF_MEAS_HDR (Measurement Header record)
Field
Index
Binary
Index*
Field Name/Description
Data
Type
Range/
Units
1 1:2 recordType short 11
2 3:6 recordSize long 156 bytes
3 7:10 unique_record — byte offset from the beginning of the file
to
a record containing an instrument-specific measurement
header. This field may be ignored when the file is
recalled
if it is recalled into an instrument type other than that used
to create it.
long
−1:0:(2
31
) 1
411:14
centerFreqOld** — center frequency. float unit is Hz,
range is i.d.
5 15:18 spanFreqOld** — frequency span. float unit is Hz
range is i.d.
6 19:22 blockSize — number of time-domain samples taken. This
field
is only valid for FFT measurements.
long
7 23:24 zoomModeOn — zoom mode (0=not zoomed, 1=zoomed).
This field is only valid for FFT measurements.
short 0:1
8 25:26 startFreqIndexOld*** — the first alias-protected point on a
frequency-domain trace.
short 0:last_valid_index
(SDF_DATA_HDR
)
9 27:28 stopFreqIndexOld*** — the last alias-protected point on a
frequency-domain trace.
short 0:last_valid_index
(SDF_DATA_HDR
)
10 29:30 averageType
0=none
1=rms
2=rms exponential
3=vector
4=vector exponential
5=continuous peak hold
6=peak
short 0:6
11 31:34 averageNum — number of averages. long range is i.d.
12 35:38 pctOverlap — percentage of time-domain samples that are
shared between successive time records. This field is only
valid for FFT measurements.
float number between 0
and 1
13 39:98 measTitle — measurement title or automath label. char[60] i.d.
14 99:102 videoBandWidth — tells you the bandwidth of the
instrument’s
video filter. This field is only valid for swept spectrum
measurements.
float unit is Hz
* Bytes ** Prior to version 2.0 *** Prior to version 3.0 i.d. = instrument-dependent
Standard Data Format (SDF)
B-11