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Table B-4c. SDF_DATA_HDR (Data Header record)

Field

Index

Binary

Index*

Field Name/Description

Data

Type

Range/

Units

11 43:44 xResolution_type — tells you how to find x-axis values for this

Data Header record’s traces.

0=linear — calculate values from abscissa_firstX and

abscissa_deltaX

1=logarithmic — calculate values from abscissa_firstX

and abscissa_deltaX

2=arbitrary, one per file — find values in the X-axis

Data record; same vector used for every trace in the

measurement file

3=arbitrary, one per data type — find values in the

X-axis Data record; same x-axis vector used for each

trace associated with this record

4=arbitrary, one per trace — find values in the X-axis

Data record; unique x-axis vector for each trace

associated with this record

short 0:4

12 45:46 xdata_type — tells you the size and format of each x-axis

value.

1=short (two-byte, binary-encoded integer)

2=long (four-byte, binary-encoded integer)

3=float (four-byte, binary floating-point number)

4=double (eight-byte, binary floating-point number)

This field is only valid if xResolution_type is 2, 3, or 4.

short 1:4

13 47:48 xPerPoint — number of x-axis values per each trace point.

This field is only valid if xResolution_type is 2, 3, or 4.

short 0:32767

14 49:50 ydata_type — tells you the size and format of each y-axis

value.

NOTE: If yIsComplex=1, both the real and imaginary

components of each y value require the number of bytes

specified here.

1=short (two-byte, binary-encoded integer)

2=long (four-byte, binary-encoded integer)

3=float (four-byte, binary floating-point number)

4=double (eight-byte, binary floating-point number)

short 1:4

15 51:52 yPerPoint — number of y-axis values per each trace

point.

NOTE: A value containing both real and imaginary

components is still considered a single value.

short 0:32767

16 53:54 yIsComplex

0=each y value has only a real component

1=each y value has both a real and an imaginary

component

short 0:1

17 55:56 yIsNormalized

0=not normalized

1=normalized (all y values fall between 0.0 and 1.0 and

are unitless, for example coherence or power spectrum).

short 0:1

18 57:58 yIsPowerData

0=not power data (for example, linear spectrum)

1=power data (for example, auto-power spectrum)

short 0:1

*Bytes i.d. = instrument-dependent

Standard Data Format (SDF)

B-15

1 2 ... 196 197 198 199 200 201 202 203 204 205 206 ... 253 254

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