Somat eDAQlite - 7.2 Arithmetic Computed Channels

Somat eDAQ lite
130
I2773-4.4 en
Input Channel
Select the desired input channel(s) to the computation. The number of input channels
permitted depends on the computed channel type.
Output Data Type
Depending on the channel type, the eDAQ lite provides several data type options.
When choosing the data type, consider factors such as data resolution, mass storage
consumption and what computed channels or DataModes use the channel as an
input. For a summary of the compatible data types for all computed channels and
DataModes, see “Data Types” on page 191.
Full-Scale Min and Max
The min and max full-scale fields define the expected extreme values of the computed
channel expression. When storing a 32-bit float in a DataMode that uses an integer
data type, the eDAQ
lite uses the full-scale limits when converting from the floating
point format to the integer format. The eDAQ
lite also uses the full-scale estimates to
set the default values for any histograms specified in the test setup DataModes.
7.2 Arithmetic Computed Channels
7.2.1 Desk Calculator
Desk Calculator computed channels generate data streams of either arithmetic
(floating point) or logical (Boolean) results.
Input Channel
All input channels to a single Desk Calculator channel must have the same sample
rate, which also determines the computed channel sample rate. The required input
data types for the Desk Calculator operator set are listed in table below.
NOTE
The time functions (e.g., _utc_day()) require an input from a Time Channel computed
channel with a 32-bit float data type (see “Time Channel” on page 150).
Output Data Type
The output data types for the Desk Calculator operator set are listed in the table above.
Operator Input Type Output Type
sin, cos, tan, asin, acos, atan,
log, log10, abs, exp, sgn,
round, floor, ceil, +,-,*,/,%,^
32-bit float 32-bit float
float 8-bit unsigned 32-bit float
>,>=,<,<=,==,!= 32-bit float 8-bit unsigned
!,&&,|| 8-bit unsigned 8-bit unsigned
time functions 32-bit float Time
Channel
32-bit float
HBM: public