SWR-584C Instruction Manual
HF/VHF/220MHz SWR Analyzer
5
2.0 Power Management
Read this section carefully --
supplying the wrong external voltage or failing to follow
battery installation procedures could result in permanent damage!
2.1 External Power Requirements:
The
MFJ-1312D AC adapter meets all technical
requirements for powering the analyzer and it is recommended. Any other external power
source must meet the following specifications:
•
Current:
250 mA or greater
•
Voltage Range:
11-16 VDC, well filtered (14 VDC ideal)
•
Battery Charging:
13.8 VDC
minimum required for battery charger operation
•
Polarity:
Negative ground only
•
Connection:
2.1-mm (
+
)
center pin, (
-
) chassis ground (see below)
+
-
+
-
2.1 mm
2.2 Internal Battery Power:
Always install fresh cells with identical part numbers and
expiration dates. For non-rechargeable power, install premium Alkaline cells and remove weak
cells
immediately
to prevent leakage. For rechargeable power, NiCds work well but Ni-MH cells
have no charge memory, hold a charge longer, and offer greater storage capacity. Before
loading new cells, always check (or know) the
charger operating status
-- is it
On
or
Off
?
Important Warning: You must disable the analyzer's charger circuit when using non-
rechargeable batteries, or destructive cell damage and chemical leakage may result.
2.3 Setting The Charger:
Remove the analyzer's back cover (4 screws on each side of the
case). Find the upper left-hand corner of the main pc board and locate the 3-pin header
J5
next to the power jack. A small black shorting plug is installed on the header.
Charger
Off
(non-rechargeable cells), install header on center and right pins as shown:
Charger
On
(rechargeable cells), install header on center and left pins as shown:
The charger provides a near-constant 20-mA/hr "trickle" rate any time external power is
applied. The
Power
switch need not be on for charging to take place. Charging depleted cells
may require 12 hours or more, so always allow enough time. Batteries will not over-charge.
