MFJ-269 Instruction Manual HF/VHF/UHF SWR Analyzer
7
If you use any type of non-rechargeable dry cell battery,
remove weak batteries immediately
. Batteries must be
removed before storing this unit for extended periods of time (longer than one month). Never ship this unit with
batteries installed.
WARNING: WHEN USING CONVENTIONAL NON-RECHARGEABLE BATTERIES, THE
CHARGING SYSTEM MUST BE DEFEATED! IF YOU FAIL TO FOLLOW THIS
WARNING, THE BATTERIES WILL LIKELY LEAK AND RUIN THE
ANALYZER!
2.5
Blinking “VOLTAGE LOW” display warning
a.) If supply or battery operating voltage is less than eleven volts, a blinking “
VOLTAGE LOW
” warning is
displayed. Pressing the “
MODE”
button during a low voltage warning will disable the warning, and allow
operation with low supply voltage. Readings might not be reliable when operating with supply voltages of under
11 volts.
2.6
“Power Saving” Mode (sleep mode)
The operating current drain of the MFJ-269 is approximately 135 mA for HF operation.
Battery life is extended by using an internal "Power Saving” mode. “Sleeping” battery drain is less than 15 mA.
If you do not make
MODE
switch changes, or change frequency more than 50 kHz during any three minute time
period, a power saving (Sleep) mode begins. “Sleeping” is indicated by a blinking
“SLP”
message in the
display’s lower right corner, as shown here:
To wake the unit up, momentarily press the ‘‘MODE’’ or ‘‘GATE’’ button.
Disable the “Power Saving” mode by pressing and holding the
“MODE”
button before power is applied (or
before the “
POWER”
button on the unit is turned on). You must hold the
“MODE”
button and only release it
after the copyright message appears.
If the “Power Saving” mode is successfully disabled on power up, when the
“MODE”
button is released the
display will momentarily indicate:
When using conventional non-rechargeable batteries, the internal jumper located on the printed circuit board near
the power jack
must be
set like this:
Charger is now OFF!