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SoMat eDAQ
The outputs are generated from a D/A converter implemented as a unity gain follower
to the A/D converter. The eDAQ uses the non-inverting unity gain follower by default.
Select the analog output inverting option in the ECPU hardware configuration to use
the inverting unity gain follower.
NOTE
The EHLS uses a nominal ±2-volt A/D converter. However, do not assume that the
user-defined full-scale values are even approximately equivalent to ±2 volts for any
particular channel. This is primarily because TCE automatically provides a minimum
overrange protection of 1% and the eDAQ can set gains only at certain discrete values
resulting in actual overrange protection that is sometimes significantly larger than 1%.
TCE provides the option to generate an AOM calibration file which is an ASCII file
containing all of the information required to scale the analog output signal voltages to
equivalent engineering values. The file also includes SIE or SIF file analog output
scale and offset keywords for each channel stored in a Time History DataMode. Select
Save AOM File from the Test Control menu to generate the file. For more information
on the AOM file, see “AOM Calibration File” on page 72.
5.8
SMART Modules
SMART module adapters act as an interface between a transducer and an EHLS input
channel which powers the module. Each SMART module provides specialized signal
conditioning as a front end to the EHLS signal conditioning and includes independent
self-identification capabilities and self-calibration parameters. The following table lists
the available SMART modules.
SMART Module
Order Number
Description
SMSTRB4 Strain
SMART Module
1-SMSTRB4-120-2 or The SMSTRB4 supports full-, half- and
quarter- bridge transducers and includes
1-SMSTRB4-350-2
5- and 10-volt excitation options and
internal shunt calibration using either 50or 100-kilohm shunt resistors with both
upscale and downscale shunting
options.
SMITC
Thermocouple
SMART Module
1-SMITC-2
The SMITC supports fully-isolated
thermocouples of type J, K, T or E over
the full temperature range of the
thermocouple.
For more information on setting up SMART module input channels, see “SMART
Module Input Channels” on page 125. For information on wiring SMSTRB4 inputs, see
“SMSTRB4 (Strain SMART Module)” on page 218.
Installation
The eDAQ does not sense when a SMART module is installed or removed. After
connecting a module, either cycle the eDAQ power or perform a hardware query to
detect the installed SMART module. In both of these cases, the eDAQ applies power
and sends a query to all EHLS channels that support SMART modules. Note that the
SMART modules remain in a default configuration until an action such as starting a
I2740-1.1 en
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