UNI-T UT131 Series User Manual

P/trl:
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10401108573X
JUN.2019RB/.3
tJT131
a,/e/C,/O
Falrn Size
Multirneten
lJser Manual
UNT.T
l.
Overview
The new generation
UT131
series products redefine the pedormance
standards for entrylevel
digital mulUmeter The innovative
industiat
design
ensures the producb have 2 mete6
impad resisian@. The new LCD display
layout provides a cleardisplayfor
befrer user experience. The UT131 series
ensure safe operation in CAT ll 250 V envkonment_
The special features
ofeach model are
as follows:
UT131Ai 2mF capacitance tesllunction
UT131B: Banery test wiih status indicaioB
UT131C: Temperalure test
UT131D: NCV tesi
ll.
Open Box lnspection
Open the package box and take out the device. Please check whether the
following
items are defrcieni ordamaged
and
ontactyour
supplier immediately
iflhey
are.
User manual
----------------
1
pcs
Test leads --:---.---.--------1
pai
Protective
case-."----------1
pcs
K-type thermocouple
-.*------1
pcs (UT131 only)
A
Warning:
Please carefully read "Safe Operation Rule" before using the device.
lll.
Safe Operation Rule
'l). Safety ceilificatlon
This device stridly
follows the CE standards: EN
6filA-l:2010,
EN 61010-2-030:2010, EN 61326:201 3,
as well as CAT ll: 250V RoHS,
pollution grade ll, and double insulation standards.
2).
Salety instructions
and
precautions
1. Do not use the deUce ifthe
device or test leads appear damaged or if
you suspect that
the device is not operating property.
pay particular
afrention to ihe insulation layers.
2. lfthe
test ieads are damaged, it must be replaced with one ofthe
same
type or the same electrical specification.
3. When
measring,
do
not
touch exposed wir€s, connecloB, unused inputs,
or the circuit being measured.
4. When measuring the
voltage
higher than 60 VDC or
30 VACrms, keep
yourfingers
beh
nd
the fnger guard on the test lead in order to prevent
elechic shock.
5,
lfthe
range ofthe voltage to
be
measured
is unknown, ihe
mdimum
range
should
be
selected and then gradually decreased.
6. Never input voliage and current exceeding the value
tisted on the device.
7. Before switching ranges, make sure to disconnect the test leads with the
circuit to
be
tested. lt is stridly prohibited to switch the ranges during the
measurement.
8. Do not use orstore
the device in high temperatu€, high humidity, flammabte,
explosive or strong magnetic field envircnmenls.
L
Do not
change
tTe inlemal
ckdii ofhe
devie
in order to avoid the damage
to the device and users.
10.To avoid false
reading, replace the battery when the baltery indicator
Ea appeaE.
11.Use dry cloth to clean the €se,
do not use detergeni conbining solvents
lV. Electrical Symbols
a
High voltage warning
+
Eledrical ground
Direct curreni
A
Warning
E
Double insulation
g
Confoms
lo
UL
STD. 61010-1, 61010-2-030, Cefrified to
CSA STD. C22.2 No. 61010-1, 61010-2-030.
Comply wi{h European Union Standards
It is
appliGble to test and measuring circuib @nneded
diredy
to
utiliation
points isockeL outlers and siTilar points) ot lle
low.volbg
MAINS installation
V.
Specification
1.
The maximum voliage betueen the input terminal and lhe ground:
250Vms
2.
l0Aterminal:
Fuse 10A250V Fast fuse 05v20mm
3. mAJ!Aterminal:
Fuse 200mA250V
Fast fuse @5r2omm
4. [4ax display
1999,
over range display "OL", update
rat€:
2-3 times/second
5. Range seled: Auto range UT131A; Manual range UT131B/C/D
6. Backlighi: manual on, auto shui
offafter 30 seconds
7. PoJarity:'!" symbol displaying on screen represenb negative polarity
signal.
L
Daia hold function:Esymbol
displays on screen when data hold fundion
is
activated
9.
l"ow batery rcwer:
E
symbol displays on
s{ren
when batery rcwer
is
low
10. Bafrery: AAA'1
5V'2
1'1.
Operating iemperaturet 0-40"C (32 F-104'F)
Storage lemperature: -10-50" C \14'
F
-122'F)
Relative humidily: 0'C-30"C: <75%
RH, 30'C-40'C: <50%
RH
Ooeralng
allilude:
O
-
2000n
12. Dimension: (134x77x47) mm
13.
Weight
aboat 2069 (battery included)
1
4. Electomagnetic compatibility:
ln fields with less than 1Vlm radio frequency, the total accuracy
=
designaled..accuracy + 5% of measuremenl range
ln fields with
more than 1Vlm radio frequency, the accuracy
is not
specified.
Vl.
Structure (see Figure
1)
1
Display screen
4
10A input
jack
2
Fundion
keys
5
COM jack
3
Fundional dial
6
Remaining inputs jack
Figure
1
Vll. Key Functions
't)
uT131A:
a SEL/RELr press ihis
key to switch between AC and DC modes for
mV=, l=, and REL posiiions.
HOLD/fi
Press
to enter or
exit
data hold mode. Long press over 2 se@nds
to turn on/off backiight.
2)
UTl31B/C/D:
a
HOLD/SEL: Press
io
enier or exit data hold mode
In conlinuiv/diode mode, press to cycle switch beMeen ihe tuo
modes
a $:
Press to lurn on/off backlight.
Vlll. Operations
To avoid
false
reading, replace
the
battery
ifthe
battery low power symbol
Clappears.
Also pay special attention to ihe warning sign
Abeside the test
lead
jack,
indicating that the tested voltage or current must not exceed the
values listed
on
lhe device.
1.AC/DC voltage measurement (see Figure 2b)
1)
Switch the dial
to'V-"
position.
2)
lnsed the black tesl lead
into the COM
jack, the red test lead
into the
ryOmA" iack. Connect test leads with the load in parallel.
Figure 2a
Figure 2b
A
Not"",
a
Do not measure voltage over 250vrms, or it may expose users to electric
shock and damage the devi@. lf the range
oI
lhe vollage to be measured s
unknown, seleci the maximum range and reduce a@rdingly.
a
Please pay extra aflention when measuring high voltage in
orderto
avoid
electric shock.
a
Before using the
device,
it is suggested to measure a known voltage for
verification.
2,Resistance measurement (see Figure
2b)
1) Switch the
dial
to
n" position.
2) lnsed ihe black test lead
into
the COMjack, the
red
test
tead into
ihe "VOmA"
jack. Conned lest leads with the resistor
in
parallet
ANot"",
a
Before measuring resistance, switch offthe power supply
ofthe circuit, and
fully discharge all capacilors.
a
lfthe resistance when probes are shofred is more than
0_5O,
please check
if
lesl leads are loosened or damageo.
.
lf
ihe resistor
is open or over the
range,
ihe
OL" symbol wilt
be displayed on
lhe scteen,
a
When measuring low resistance, ihe
test leads wil]
produce
O.1O-0.20
measLremenl error.
To oblain accurale measurerent, lne neasured
va,Le
shouid
subtactlhe
value displayed when tuo
tesi teads are
shoded_
o
When measuring high resistance above
1
IrO, it is normal io
take a
few
seconds to steady the readings. ln o.derto quickly obtain steady data, use
shod lest wires lo measure high res;slarce.
3. Continuity measurement (see Figure
2b)
1
) Swilch the dia to
"
-i"
position.
2)
lnserl the black test lead
inlo the
COIV
jack, the rcd test lead
into
the VnmA"
lack. Connect test leads with the points io
be
tested in parallel
3)
lfmeasured points'resistance >51O, circuil is in open status.
lf
measured
poinb'
resisbnce <10O, circuit
is
in good conduction stalus,
buzer willgo off
ANot".,
Before measudng @ntinuiiy, switch oflall power suppiies
and
fully discharge
all capacitors.
4. Diode measurement (see Figure 2b)
1)Swiich the dialto
")}"
position.
2)
lnsefr
the black test lead
into
the CO{\l jack, the
red
test lead
into the
,VemA"
jack- Connectlest
leads with the diode
in
parattel
3) "OL" symbol appears when the diode
is
open or poiarity
is
reversed.
For
silicon
PN
junction, norma
value:500
-
800mV (0.5
-
0.8V).
/f,.
Notes:
a
Before measuring PN
junction, switch
offthe
power supply to the ckcuit,
and fully discharce all capacitoE
5.
Capacitance measurement (only for
lJT131A,
see Figure
2a)
1)
Swiich the dial to capacitance test.
2) lnseft the black tesl lead into the COM
jack, the
red test lead into the
"VOmA"jack. Connecilest
leads
with the capacitor in parallel
3)
\
hen
there is no
inpd,
the devi@ displays a
fxed
value
(intinsic
@Bcitane).
a
For small
@pacitan@
measurement,
1o
ensu@ measuremenl
accu€cy
the measued value
must be subbacted
fom
infrnsic @pacitan@.
a
Use.s
Gn
TeasLre smdll €pacity
€padors
wilh relative neaaurement
functions (REL) (the device will automatically subtracl the inhinsic
capadbnce)
ANotes:
a
lfthe
lested
€pacitor
is shoded or ib capaciiy
is
overthe specifed range
"OL" symbol will
be
displayed
on the screen.
a
When measuring large capacitors,
it
may take
a
few se@nds to oblain
steady readings.
a
Before
measuring @pacitore
(especially for high voltage GpacitoE), ptease
fully discharge them.
6. DC
measurement (see Figure
3)
1)
Swilch ihe dial
lo
DC
test.
2) lnsed the black test lead
into the
CO[,
jack, the
red test lead
into
the
.VOmA'
iack- Connect test leads with the tested circuit
in
series.
Figure 3
,A Not"",
a
Before measuring, switch
offthe power supply
ofthe circ!it
and carefully
checkthe inputteminal
and range position.
a
lf the range of the measuaed current is unknown, selecl the maximum
range and then reduce a@rdingly.
.
Please .eplace
the
fBe
with the same-rype-
1
0Ajack: Fuse 104250V
O5x20mm
VQmAjack: Fuse 0.2tu250v O5x20mm
a
When measuring, please do nol @nnect the tesl leads with any circuit in
pa6lbl.
Otheeis
lhere is a risk ofdamage to the devie and human
body.
a
lf the tested cutrent is over
1
0A, each measurement time should be less
ihan
10
seconds and lhe
nei
lest should
be
after
1
5 minutes.
7.
AC measurement (only for
UTl31A, see Figu.e
3)
Similar to DC I\,4easurement.
Please refer to Section
6
"DC measurement (see Figure 3)"
8. Battery measurement (only for
UTl31B, see Figure
4)
1) Switch the dial to
batery
test-
2) lnsefr the biack test lead inio ihe
COL4
jack, the red test lead into the
'VOmA"jack.
Connect test leads with the battery in parallel.
Red tesl lead at positive pole "+", black test lead at negative
pole':"
3) Batery slatus:
"Good": Normal status
"Low": Low power but still working
"Bad": Replace/charge bateries
4) Baitery disp{ay
.
1.5V
batery
Load Resislance:
30 Q:
"Good": Voliage >1.31V
"Low": Voltage 0.95V-1.31V
"Bad": Vollaoe <0.94V
GodkwMd
AC
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