UNI-T UT15B PRO - Page 8

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
XI
.
Measurement
Operation
Instruction
•
MAX
button
(
UT
15
B
PRO
)
:
press
to
enter
manual
range
mode and
display
the maximum
value
.
To exit
MAX
/
MIN
measurement
mode
,
press
this button
for
over
2
seconds
or
switch the knob
.
(
Only
suitable
for
V
~
,
V
“
,
m
VS
,
Q
)
•
MIN
button
(
UT
15
B
PRO
)
:
press
to enter
manual
range
mode and
display
the minimum value
.
To exit
MAX
/
MIN
measurement
mode
,
press
this button
for
over
2
seconds
or
switch the knob
.
(
Only
suitable
for
V
~
,
V
—
,
mV
£
,
Q
)
•
REL
button
:
press
to
save
the
first
measured value
as
reference
,
then
input
again
,
the
displayed
value is the
different
value between
current
measured value and the
reference
value
,
press
it
again
to
exit relative
measurement
mode
.
(
Only
suitable
for
V
~
,
V
“
,
mV
£
,
IS
5
,
Q
,
Hf
-
)
.
Long
press
to enter
or
exit this
function
for
UT
18
B
PRO
.
•
Hz
/
%
button
(
UT
17
B
PRO
/
UT
18
B
PRO
)
:
under
voltage
and
current measurement
mode
,
press
this button
to
switch
to
frequency
or
duty
ratio
measurement
mode
.
•
SELECT
button
:
press
to
select
functions
(
only
suitable
for
multi
-
range
)
.
Under
AC
voltage
mode
,
press
this
button
will
display
VFC
and
enter
Variable
Frequency
Filter
measurement
mode
,
which
can measure
variable
frequency
voltage stably
,
press
this button
again
to
exit
VFC
measurement
mode
.
•
HOLD
button
(
suitable
for full
range
)
:
•
Press
to
lock hold the
displayed
value
,
and
LCD
will
display
m
symbol
,
press
it
again
to
relieve and
enter
the
normal
measurement
mode
.
•
BL
button
(
-
#
)
:
press
to turn
on
/ off
the
background
light
sensing
function
.
•
LIGHT
button
( )
:
turn
on
or
off
the
flashlight
lighting
function
.
Check
the
built
-
in AA
1.5
Vx
2
batteries
,
the
a
symbol
will
be
displayed
if
the
battery
is low
and needs
to
be
replaced
in
time
,
which
.
With
the
symbol
of
A
.
displaying
,
please
notice that the
measuring voltage
or
current
shall
not
exceed the
specified
value
in
order
to
ensure
safety
!
1
.
AC
Voltage
Measurement
(
Figure
3
)
1
)
Turn the
function
selection knob
to
the
AC
voltage
scale
.
2
)
Insert the red
test
lead
to
V
port
and the black
one
to
the
COM
port
,
and
connect
the
tips
of
two test
leads
to
both
ends
of
measuring voltage separately
(
with
the load
in
parallel
)
to
measure
.
3
)
When the
input impedance
of
the
meter
is about
10
MQ
,
the load
may
cause
measurement
error
in
circuit
with
high
impedance
.
In
most
cases
,
if
the
circuit
impedance
is
under
10
kQ
,
error can
be
ignored
(
0.1
%
or
lower
)
.
4
)
Press
SELECT
button
in
ACV
mode
to enter
the
VFC
Variable
Frequency
Filter mode
,
then the
high
frequency
interference
signal
will
be
filtered
out
through
internal
specific
filter
circuit
to
ensure
the
accuracy
.
It
can
be
applied
in
VFC
frequency
conversion
voltage
.
5
)
The
AC
measurement
value is
true
RMS
value
.
r
\
j
HwRHS
8000
Count
*
M
8
UB
KIEL
tSGDEDE
*
Figure
3
14
13