MFJ-886B Frequency Counter
7
10 Backlight
key
1. It is used to turn on
and off the backlight of
LCD display screen.
2. Press it once and
the backlight of LCD
display screen will be
on; press it once again
and the backlight of
LCD display screen will
turn off.
3. Press and hold it for
3s and the backlight of
LCD display screen will
be on for an extended
period; press it once
again and the backlight
of LCD display screen
will turn off.
11
Charge
indicator light
1. Red light is on
when the frequency
counter is being
charged;
2. Green light is on
when the frequency
counter is fully
charged.
12
Fine adjustment
access for
frequency
calibration
This access port can be
used for frequency
calibration when needed
to adjust for drift of the
crystal over time due to
aging. An accurate time
base is required to
adjust to the best
frequency counter
accuracy.
