DIGITAL MULTIMETER
OPERATING INSTRUCTION NTS
4.24.6 Read the resistance on the main indicator of the LCD.
NOTE:
NOTE:
NOTE:
NOTE:
If the test leads are open or the resistance of the circuit is
over 400
Ω
, “OL” will appear on the LCD.
4.2
4.2
4.2
4.25
5
5
5 MEASURING
MEASURING
MEASURING
MEASURING TEMPERATURE
TEMPERATURE
TEMPERATURE
TEMPERATURE ((((NON
NON
NON
NON----CONTACT
CONTACT
CONTACT
CONTACT))))
(WITH
(WITH
(WITH
(WITH INFRARED
INFRARED
INFRARED
INFRARED THERMO-SENSOR)
THERMO-SENSOR)
THERMO-SENSOR)
THERMO-SENSOR)
WARNING
WARNING
WARNING
WARNING
Do
Do
Do
Do not
not
not
not point
point
point
point a
a
a
a laser
laser
laser
laser beam
beam
beam
beam at
at
at
at human
human
human
human eye
eye
eye
eyes
s
s
s....
Despite
Despite
Despite
Despite
the
the
the
the llllow
ow
ow
ow power
power
power
power of
of
of
of the
the
the
the laser
laser
laser
laser beams,
beams,
beams,
beams, damage
damage
damage
damage to
to
to
to the
the
the
the
eyes
eyes
eyes
eyes may
may
may
may be
be
be
be caused
caused
caused
caused if
if
if
if they
they
they
they are
are
are
are exposed
exposed
exposed
exposed to
to
to
to laser
laser
laser
laser
beams
beams
beams
beams for
for
for
for a
a
a
a long
long
long
long time.
time.
time.
time.
To
To
To
To avoid
avoid
avoid
avoid damage
damage
damage
damage to
to
to
to the
the
the
the meter,
meter,
meter,
meter, do
do
do
do not
not
not
not connect
connect
connect
connect the
the
the
the
input
input
input
input plug
plug
plug
plug to
to
to
to any
any
any
any electric
electric
electric
electric signal.
signal.
signal.
signal.
4.25.1 Turn the rotary selector to the IR-T range position.
4.25.2 Aim the foreside of the meter (infrared sensor) at the
surface to be measured.
4.25.3 To ensure that the infrared sensor is targeted at the
object to be measured, press the “
”button to turn on
the laser beam with the red spot positioned at the
centre of the surface to be measured.
4.25.4 Press the "
℃
/
℉
" button to choose
℃
or
℉
measurement.
4.25.5 Take the reading on the LCD.
- 42 -
DIGITAL MULTIMETER
OPERATING INSTRUCTION NTS
NOTE:
NOTE:
NOTE:
NOTE:
1
）
The infrared temperature sensor is placed inside the
front part of the meter.
It may take a longer time to
reach
thermal
balance
with
the
environment.
Therefore the meter should be exposed to the
environment for a longer time for accurate reading.
2
）
The meter is designed to have a emissivity ε=0.95,
which is the rate for most objects.
When measuring
objects with a different reflection rate, different results
may appear.
3
）
The following diagram shows the surface diameter and
distance of the object to be measured.
distance to object
64mm
diameter
object surface
16mm
80mm
1
0
m
m
Diameter and distance ratio: the ratio that determines the
surface diameter of the object being measured to the
distance between the object and the lens of the meter.
For example, if the surface diameter of the object is
10mm, the distance between the object and the meter
- 43 -
