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2-3.1
Connecting the Transducer Cable to the Electronics Unit
The transducer cable is a multi-pair, multi-shielded cable designed specifi-
cally for use with the ADFM. The standard cable length is 15 meters (49
feet), but other cable lengths are available. Contact MGD Technologies Inc.
for details. Extension cables are not recommended due to EMI/RFI con-
straints.
CAUTION. Use caution when mating or unmating the transducer cable to
the transducer assembly and Electronics Unit to avoid damage to the
connector hardware. UNDER ALL CIRCUMSTANCES, THE INTRUSION
OF WATER OR ANY OTHER FOREIGN MATTER INTO THE
CONNECTOR CONTACT AREA MUST BE AVOIDED, SINCE THIS MAY
RESULT IN PERMANENT DAMAGE TO THE CONNECTOR AND MAY
RENDER THE ADFM INOPERABLE.
The transducer cable connects to the electronics unit using a 14-position
keyed connector. The receptacle on the electronics unit is located on the
bottom right side of the unit.
To make the connection, remove the blank cap from the receptacle on the
electronics unit. Insert the cable connector into the receptacle, rotating it
until the keyed portions are properly aligned. Thread the coupling ring onto
the receptacle to complete the connection. Reverse this procedure when
disconnecting the cable from the electronics unit.
2-3.2
Power Supply to the ADFM
CAUTION. BEFORE connecting mains (AC) power to this instrument, be
sure the line voltage selector jumpers inside the Electronics Unit is set
properly and the correct fuse is installed.
Power Supply Options
The ADFM is designed to operate from one of three independent power
sources: internal batteries, external DC power supply, or external AC power
supply. All sources may be used concurrently; the source that supplies the
highest voltage will automatically supply power to the system. Mains (AC)
power is converted to a DC supply of approximately 28-30 VDC after recti-
fication and filtering inside the ADFM. By combining external mains
power with internal batteries, one can obtain uninterrupted operation of the
ADFM during brief power outages. Both front panel power switches must
be in the "On" position for this to occur.
Two internal battery options are available for the ADFM. The standard con-
figuration consists of four 6-volt alkaline lantern batteries with spring ter-
minals. Recommended alkaline batteries are the Eveready Energizer, Model
EN529. These alkaline batteries have approximately 2.5 times the
ADFM Technical Manual (January 2000)
Equipment Setup and Installation
page 2-3
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