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Interface Boards
Chapter 6 Theory of Operation 61
Figure 6-3 Combined Interface Board M1353-66531(E)
Both the M1353-66531/66531E boards include the following sections:
Analog Signal Filter Section:
An analog input for FHR, US LF or DECG, with low pass filter and variable gain
amplifier.
An analog input for TOCO/IUP with low pass filter.
The analog signals are fed to the A/D convertor on the CPU Board.
Digital Clock and Control Sections:
Board ID latch.
Status input lines.
Control latch.
Bus control and clock circuits.
Calibration and Self Test Section:
Calibration and reference circuits.
System controlled test signal generation.
Analog switches to apply reference voltages and test signals to the telemetry
inputs.