User`s guide

Table B-6a. SDF_CHANNEL_HDR (Channel Header record)
Field
Index
Binary
Index*
Field Name/Description
Data
Type
Range/
Units
1 1:2 recordType short 14
2 3:6 recordSize long 212 bytes
3 7:10 unique_record — byte offset from the beginning of the file to
a record containing an instrument-specific vector header.
May be ignored if recalled into a different type instrument.
long
−1:(2
31
) 1
4 11:40 channelLabel — channel documentation char[30] i.d.
5 41:52 moduleId — location of channel in instrument. char[12]
6 53:64 serialNum — instrument (or module) serial number. char[12]
7 65:88 window struct see SDF_
WINDOW
8 89:90 weight
0=no weighting
1=A-weighting
2=B-weighting
3=C-weighting
short 0:3
891:94
delayOld*** float
9 93:96 range float unit is dBV,
range is i.d.
& includes
overhead for
scaling
10 99:100 direction
−9=−TZ
−8=−TY
−7=−TX
−3=−Z
−2=−Y
−1=−X
0=no direction specified
1=X
2=Y
3=Z
4=R (radial)
5=T (tangential — theta angle)
6=P (tangential — phi angle)
7=TX
8=TY
9=TZ
short 0:9
11 101:102 pointNum — test point on device under test short 0:32676
12 103:104 coupling (0=DC, 1=AC) short 0:1
13 105:106 overloaded (0=no, 1=yes) short 0:1
14 107:116 intLabel — label for the instrument’s internal unit (such as V) char[10] i.d.
15 117:138 engUnit — engineering unit (EU) definition for this channel struct see
SDF_UNIT
16 139:142 int2engrUnit — EU correction factor. Divide internal-unit data
by this value to get EU data
float
10
34
(except 0)
* Bytes *** Prior to version 3.0 i.d. = instrument-dependent
Standard Data Format (SDF)
B-18