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Multiplexer PC Board
The Multiplexer PC board selects amplified electrode signals for the
Contact board, adds a programmable offset and gain, and sends the
resulting high-level signal to the Main board for digitizing. The Multiplexer
board provides the following:
•
four galvanically isolated, dual-channel amperometric circuits with
precision bias voltage
•
a precision reference bridge and amplifier for the sample temperature
thermistor
•
32-channel multiplexer and programmable gain/offset circuit
•
oscillator circuit to generate control signals for hematocrit circuits
•
conditioning circuits for the Contact board power supply
•
input circuit for the block and preheater thermistors
Rev. C
Electronic System Overview 101
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Troubleshooting
