ADLINK Technology USB-2401, User Manual

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30 Operation
Figure 3-4: Current Source Connection
3.3.3 Full Bridge and Half Bridge Input Mode
A bridge-based transducer is a passive device, requiring voltage
excitation to convert the resistive change to an electrical signal.
The USB-2401 provides a steady 2.5V excitation voltage for each
analog input channel in full bridge and half bridge modes. For
half-bridge transducer, USB-2401 has built-in precision 20k
Ÿ
resistors to compensate the circuit as a full-bridge transducer
measurement.
Also provided is a moving average function, a common and useful
digital filtering method of smoothing fluctuation caused by noise.
The averaging number for data can be set to 0, 2, 4, 8, or 16,
where 0 represents disabling the moving average function.
A typical four-wire connection is shown.
NOTE:
NOTE:
A dotted line represents the connection and circuit of full-bridge
mode.
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