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ADFM System Overview
A-1
Introduction
The ADFM consists of two units: the Electronics Unit and the transducer.
Both Units are described below to a detail necessary for an understanding
of their function, and as an aid for troubleshooting.
A-2
Electronics Unit Circuit Description
The following description refers to Figure A-17. The legends used are
spelled out more precisely in Table A-18.
A-2.1
Power Supply System
The power supply supplies the ADFM Electronics Unit and the ADFM
transducer with power. It is designed to minimize energy consumption, by
employing low power circuits, and power strobing of functional circuit
modules. In addition, a highly efficient switching regulator generates the
ADFM's five-volt main power supply.
The necessary supply voltages are derived from mains, an external DC-
supply, or an internal 24-volt supply. Any combination of supplies is also
possible. The highest DC-voltage in the system will determine which power
source will supply the ADFM. The mains supply will generate approxi-
mately 28 VDC. Therefore, if an internal battery is installed (24 VDC) and
mains is connected, the ADFM will be supplied by the mains voltage, when
the mains power switch is in the "On" position.
Mains enters the system through the power entry module (MAINS PWR
ENTRY), which provides the voltage selector switch, the mains fuse, and
electro-magnetic interference (EMI) filtering. The mains power switch lo-
cated at the front panel allows On/Off control of the mains power. A power
transformer changes the mains voltage level at the primary winding, which
can be configured to accept either 115 or 230 volts ac, to about 20 VAC at
ADFM Technical Manual (January 2000)
ADFM System Overview
A
Appendix
page A-1
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