User`s guide

Table B-6b. SDF_CHANNEL_HDR (Channel Header record)
Field
Index
Binary
Index*
Field Name/Description
Data
Type
Range/
Units
17 143:146 inputImpedance — Input impedance float unit ohm,
range i.d.
18 147:148
channelAttribute
−99 = unknown attribute
0=noattribute
1 = tach attribute
2 = reference attribute
3 = tach and reference attribute
4 = clockwise attribute
short
−99:3
19 149:150 aliasProtected
0 = data was not alias protected
1 = alias protected
short 0:1
20 151:152 digital
0 = analog input channel
1 = digital input channel
short 0:1
21 153:160 channelScale — see channelOffset below double unit is volts,
range is i.d.
22 161:168 channelOffset — when the data type is ‘’short’’ or ‘’long’’ the
following formula will convert the data to volts:
Volts = channelOffset + ( channelScale  Ydata)
double unit is volts,
range is i.d.
23 169:176 gateBegin — Gated sweep start time double unit is sec,
range is i.d.
24 177:184
gateEnd — Gated sweep stop time double unit is sec,
range is i.d.
25 185:192 userDelay — User specified input channel time delay or line
length (not trigger delay)
double unit is sec,
range is i.d.
26 193:200
delay — amount of time between trigger event and start of data
collection
double unit is sec,
range is i.d.
27 201:208 carrierFreq — carrier frequency for demodulated data double unit is Hz,
range is i.d.
28 209:210
channelNumber — zero-based channel number short 0:32767
29 211:212 channelModule — zero-based channel module short 0:32767
*Bytes i.d. = instrument-dependent
Standard Data Format (SDF)
B-20