Philips M1351A Manual do Utilizador descarregar pdf (Página 71)

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.

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Philips M1351A Manual do Utilizador Página 71