Fluke 8024B - 2.21. The Display

8024B
2-21. The Display
2.22 As Figure 2-4 shows, your 8024B has a 3-1/2 digit liquid crystal display. Displayed
values can range from 000 through 1999 (1999 is rounded to 2000 for ease of discussion).
The decimal point position is determined by the selected range and is independent of
selected function, except temperature. When the °C function is selected, the decimal point
is not displayed. If the dc voltage or current measurement function is selected, the minus
sign indicates that the input signal is negative with respect to the COMMON input
terminal. If the °C measurement function is selected, the minus sign indicates that the input
temperature is below zero. The absence of a minus sign indicates a positive reading. The
minus sign is also used in conjuncton with the up and down 4 arrows when analyzing the
input signal using the level detector function. ¥
NOTE
The minus sign (-) may flash momentarily as the 8024B comes out of an
overrange condition. This will most likely be seen in the ohms mode as the
open circuit test leads are applied to an in-range resistance value. If the
minus sign remains on for in-range ohms readings, the circuit is live (a
negative voltage is present at the input terminals due to charged capacitors,
etc.) and incorrect resistance readings will be displayed.
Figure 2-4. Display
2-23.
The
up
and
down
.
arrows
(above
and
below
the
minus
sign)
are
enabled
by
selecting
the
resistance
or
conductance
functions.
These arrows
are
visual
indicators
for
the
continuity
and
level detector
functions.
2-24.
The
display
has
two
abnormal
status
indicators
(Figure
2-5),
low
battery
power
and
instrument
overrange.
A
BT
is
displayed
when
approximately
20%
of
battery
life
remains
(battery
replacement
is
indicated).
A
1
followed
by
three
blanked
digits
is
displayed
(decimal
point
may
be
present)
as
an
overrange
indication.
It
means
that
the
next
higher
range
should
be
selected.
It
does
not
necessarily
mean
that
the
instrument
is
being
exposed
to
a
damaging
input
condition.
For
example,
when
measuring
resistance
an
open-input
will
cause
an
overrange
indication.
2-8