ETS-Lindgren 6502 Specifications download pdf (Page 9)

MODEL 6502 ACTIVE LOOP ANTENNA Calibration

REV E – PN 399058

CALIBRATION

The IEEE 291-1991 Induction-Field Method of Calibration is used

on the Model 6502. By using relatively close spacing between the

transmitter and the receiver at frequencies below 30 MHz, the use

of free space magnetic induction field from a transmitting loop

antenna is most suitable. This method yields almost no reflection

from the ground or nearby objects. The value of magnetic field

produced can be expressed in terms of the equivalent free-space

electric component that would exist in a free space radiation field

because loop antennas are used both for transmitting and receiving.

BATTERY CHARGER

The Model 6502 is powered by two (2) – six (6) VDC sealed lead-

acid batteries. A battery charger is supplied with the unit. The

battery charging port on the front of the unit allows for easy

recharging of the unit. Two (2) internal fuses protect the unit from

unintentional shorting.

The EMCO brand Voltage-Selectable Battery Charger is solely

intended for charging the sealed lead-acid batteries found in

EMCO products. The battery charger is a means of providing the

necessary charge voltage and current from either a 115 or 230

VAC 50/60 Hz source.

NOTE: It is necessary to select the proper input voltage PRIOR to

connecting the battery charger to the power mains. The voltage

selection switch is located adjacent to the power input receptacle.

To maintain safety requirements, use the CSA certified power cord

provided. If it is necessary to provide other means of attaching the

battery charger to the power mains it is required that a type HD 21

(PVC cord) or type HD22 (rubber cord) with a nominal cross

section of 0.75 mm 2 be used.

The battery charger provides both fast and trickle charge operation.

Switching from one charge mode to the other is provided

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ETS-Lindgren 6502 Specifications Page 9