Zaber X-MCB2 Series, Руководство пользователя

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33 ZABER TECHNOLOGIES INC.
10.3. Analog Inputs
The analog inputs on the X-MCB2 accept and display voltages in the range of 0 – 10V. In order to
measure other analog variables, a transducer or sensor is required that outputs an appropriate
voltage range. As transducers typically provide low voltage signals, an amplifier and buffer circuit
is required to interface a transducer to the X-MCB2.
The reference circuit below demonstrates how to connect a wheatstone bridge to one of the
analog inputs on the X-MCB2. Various instruments are configured in a wheatstone bridge
arragement, including load-cells and strain guages.
R_GAIN's value should be chosen so that a positive full scale of the instrument produces 10V at
the analog input of the X-MCB2 and a negative full scale produces 0V. The OP97 op-amp
provides an offset of 5V to the amplified value so that no load on the instrument produces an
output of 5V.
The reference circuit below demonstrates interfacing a thermocouple to the X-MCB2. Depending
on the application, an offset voltage may need to be provided.