Somat eDAQlite, Руководство пользователя, Страница: 115 / 228

I2773-4.
4
en 115
Somat eDAQ
lite
Bridge Type
Select the bridge type to match the transducer or select the differential amplifier option
if the transducer does not use a bridge. The available types are full bridge, half bridge,
quarter bridge and differential amplifier.
Output Proportional to Excitation
Select the proportional excitation option if the output signal is linearly proportional to
the applied excitation signal as it is for bridge type transducers. When using this option,
the eDAQ
lite makes a minor correction for the fact that the set excitation voltage
cannot be exact.
Bridge Resistance
For quarter bridge configurations, the value defaults to the provided completion
resistor. If necessary, modify the value if the actual strain gage has a slightly different
resistance. For either full or half bridge configurations, select any resistance in the
range of 100 to 10000 ohms.
Gage Factor
Define the gage factor for the specific strain gages used. TCE uses this value only in
the shunt tool calibration option that defines an equivalent strain based on the gage
factor and bridge factor values.
Bridge Factor
Define the bridge factor for the specific configuration of strain gages used. TCE uses
this value only in the shunt tool calibration option that defines an equivalent strain
based on the gage factor and bridge factor values. The bridge factor is defined here
as the arithmetic sum of the active bridge legs for any bridge configuration. For
quarter-bridge applications, the bridge factor is normally one; for half-bridge
applications where both active gages are additive, it is normally two; and for full-bridge
applications where all active gages are additive, it is normally four. Because there are
special applications where the bridge factor can be a fraction and/or a negative value
TCE considers any nonzero value valid.
Leadwire Resistance Correction
Select the leadwire resistance correction option to compensate for leadwire resistance
effects when using the defined span or external span calibration modes.
NOTE
The eDAQ
lite
always performs leadwire resistance correction for shunt calibrations.
Leadwire Resistance
Specify the value of the leadwire resistance when using the leadwire resistance
correction option. The resistance input is the resistance of one lead, ideally measured
from the ELBRG layer connector pin to the connection at the active bridge leg. It is
presumed that all lead wires are approximately the same length. Quarter-bridge
applications require the use of all three wires.
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