UNI-T UT15B PRO - Page 12

UT
15
B
PRO
/
UT
17
B
/
UT
18
B
PRO
User Manual UT
15
B
PRO
/
UT
17
B
/
UT
18
B
PRO
User Manual
9
.
LED
Measurement
(
UT
18
B
PRO
)
(
Figure
9
)
1
)
For UT
18
B
PRO
,
the
LED
displays
OV
when
turning
the
function
selection knob
to
the
LED
TEST
scale
.
2
)
Panel
jack
test
:
The
LED
light
turns
on
immediately
when
it
is inserted
,
green
light
represents
positive pole
.
3
)
Test
of
input
terminal
of
test
lead
:
Connect
red
test
lead
to
“
LED
”
terminal
;
and black
test
lead
to
“
COM
”
terminal
.
Contact
the
two
pins
of
LED
through
the
test
probes
respectively
,
the
LCD
will
display
the
voltage
value
at
which
the
LED
is
lit
.
If
LCD
does
not
display
”
,
the
pin
contacted
by
red
test
lead
is
positive
,
while contacted
by
black
one
is
negative
,
or
vice
versa
.
10
.
Other functions
•
After
powering
on
and its
full
-
screen
display
,
the
meter
is
in
the normal
measurement
status
.
ErrE
will
be
displayed
when the internal
EEPROM
makes
an error
.
Restart the
meter to return to
normal
.
•
The
meter
will
automatically
power
off
to
save
power
if
there is
no
operation
for
15
min
.
Then
users
can
wake
it
up
by pressing
any
button
or
rotating
knob
in
suspend
mode
with
buzzer
beeps
.
Press and hold the
SELECT
button
in
power
off
state
and meanwhile
power
on
the
meter
,
auto
-
off
function
will
be cancelled
,
and the
(
V
;
symbol
on
LCD
will
disappear
with
a
long
beep
.
Restart the
meter
can
turn
the
auto
-
off function
on
again
.
•
Buzzer
:
a
.
The buzzer
will
beep
continuously
when the
input
voltage
is
or over
1000
V
(
AC / DC
)
,
which
warns
the
range
is
at
the
limit
.
b
.
The buzzer
will
beep
continuously
when the
current
is
or over
10
A
(
AC / DC
)
,
which
warns
the
range
is
at
the
limit
.
•
Low
voltage
detection
:
internal
VDD
can
be detected when
power
is
supplied
,
when
it
is less than
2.5
V
,
Low
battery
symbol
a
will
be
displayed
.
IED
E
3
EE
)
:
"
^
Warning
:
1
)
The maximum continuous
output
voltage
is
12
V
for
LED
test
end
,
the maximum
peak
voltage
is
30
V
.
2
)
The
LED
lights
on
continuously
if
the
working voltage
is less than
9
V
.
The
LED
emits
flashing
light
when the
working voltage
is between
9
V
and
12
V
.
3
)
If
LED
is shorted
,
the measured
LED will
not
be
lit
,
the
two
positive
indicator
will
be
on
.
22
21