MFJ MFJ-213 - Power Sources; Internal Batteries

MFJ-213 HF/VHF/UHF Antenna Analyzer Instruction Manual
2.0 POWER SOURCES
The MFJ-213 may be powered with internal AA batteries, 18650 Li-ion cell
or with an external DC supply. To avoid needless damage and ensure top
performance, please follow the guidelines below when choosing a voltage
source.
2.1 Internal Batteries
To access the jumpers and battery compartments, remove all four screws
securing the analyzer's back cover and carefully open the case. To operate
the MFJ-213 on batteries put the EXT PWR-BAT jumper on the PC board in
the BAT position and install the batteries.
The MFJ-213 can use either AA cells or a 18650 LI-ion cell to power it on
batteries.
AA Battery power requires 3 (three) AA-size 1.5-volt alkaline cells.
Batteries are installed in a fully encased 3-cell plastic tray mounted inside
the analyzer enclosure. Slide the battery box covers sideways to unlatch, and
then lift vertically to expose the cells.
When replacing old batteries, be sure to follow the manufacturer's
environmental guidelines for safe disposal. For longest battery life, always
replace with a matched set of factory-fresh cells. The MFJ-213 will not
charge batteries in the AA cell pack. Do not use rechargeable AA cells in the
pack. The battery pack plugs into the socket on the bottom of the PC Board.
The MFJ-213 can also hold an optional
rechargeable 18650 battery and charger
board. This battery is inserted into a
holder that is placed at the bottom of the
case. Disassemble the case as listed
above and insert the battery into the
holder making sure the polarity is
correct. This battery is recharged from
the external supply through a special
charging circuit (optional) that plugs into
the MFJ-213. Charging time is about 10
hours using the MFJ-1312B. See the section on the charging function below
for charging the battery. The battery holder has a circuit built in to prevent
the battery from discharging below the minimum safe voltage. If the battery
has discharged to that point or a new battery has been put in the battery must
Version | 2 © 2012 MFJ Enterprises, Inc