Clas Ohlson UNI-T UT131B Bedienungsanleitung
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UNI-T UT131B Multimeter
Multimeter UNI-T UT131B
UNI-T UT131B multimeter
Yleismittari UNI-T UT131B
Art.no.
41-1599 Ver. 20180920
UT131B
HOLD/SEL
FUSED
250V Max
10 sec Max
FUSED
200mA Max
CAT II 250V
OFF
20M
200k
20k
10 12V 9V
1.5V
2000
200
200
V
V
200m
2000m
200
20
250
250
200μ
200m
23
English
UNI-T UT131B Multimeter
Art.no: 41-1599
Please read theentire instruction manual before using theproduct and then
save it for future reference. We reserve theright for any errors in text or
images and any necessary changes made to technical data. In theevent of
technical problems or other queries, please contact our Customer Services
(see address details on theback).
Information about themeter
Themultimeter has been designed and tested in accordance with
therequirements for installation category II up to nominal voltages of
250V and acontamination level of2.
Categorisation
Meters are divided into different categories depending on theelectrical
environment in which they are to be used and how safe/protective they are
in theevent of avoltagesurge.
Themeter label should indicate which category it belongs to.
Thecategorisation also determines how safe theinstrument is with regards
to any overvoltage which could represent ahazard for theuser.
Thecategorisation is described briefly below:
In theevent of avoltage surge in theelectricity grid (atransient from
alightning strike, etc.), therisk will be greatest where themains supply
cable enters thebuilding, for example. Further inside thebuilding,
theresistance (impedance) in thecables will increase and connected
devices will reduce and dissipate theovervoltage. Themeter category will
therefore determine which electrical environment theinstrument is designed
to be usedin.
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English
Thecategories which meters are divided into are as follows:
• Category I:For measuring electronics and products that have inbuilt
protection against voltage surges.
• Category II: For measuring single-phase equipment which is fed via
thebuilding’s electrical power supply system. Bothplug-connected and
permanently installed.
• Category III: For measuring thebuilding’s electrical systems.
Permanently installed cables, sockets, fuse boxes and switchgear
cabinets. Three-phase distribution (allpower supply cables and three-
phase equipment, machinery and appliances).
• Category IV: Three-phase at primary level and all conductors for
outdoor use.
This multimeter belongs to installation category II and is intended for
measuring voltages of up to 250V in single-phase products. Themeter
must not be used for measuring three-phase products, three-phase
conductors or switchgear cabinets even if thenominal voltage does not
exceed 250V.
Contamination level
Themeter is designed for use in environments in which contaminants
which do not conduct electricity are present. Withtheexception that
temporary conductor contamination can occur due to condensation.
Examples of environments with contamination level 2 are home
environments in dry rooms, offices, test stations and laboratories. Inother
words, rooms which have anormal indoor climate.
Themeter must not be used or stored in rooms where it could be exposed
to electrically conductive contaminants in any form (solid, liquid or gas).
Themeter should for example not be exposed to relative humidities in
excess of 75% or used in unheated rooms and must not be used in
wetrooms or outdoors where it could getwet.
It is not intended for use with electrical equipment which is used in industry
or agriculture.
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English
Safety
• This product conforms to thefollowing CE standards: EN611010-1:2010,
EN61010-2-030:2010, EN61326:2013, and CAT II: 250 V, Pollution
Degree II.
• Theproduct is intended for indoor use only.
• Make sure that theproduct is used safely by following thesafety
instructions and operating directions written in this instruction manual.
• Theproduct must never be used if it is in any way damaged or malfunctioning.
• Make sure that your fingers are behind thefinger guards when using
thetest leads.
• Make sure that thepower is turned off before working on thepower
circuit. Even low voltages can be dangerous!
• Do not measure voltages higher than 250 V DC or 250 V AC RMS using
this product.
• To avoid shocks you need to be very CAREFUL when you work with
voltages higher than 60 V DC or 35 V AC RMS. Voltages higher than this
pose arisk of harmful electric shocks.
• Set theright measuring range using theselector before starting to
measure and do not change therange whilst taking ameasurement.
• Never use theproduct if thebattery cover is missing or thebattery
compartment is open.
• To avoid electric shocks and damage to themeter, do not exceed
theproduct’s overload limits.
• This product is protected by fuses, but they will not protect themeter
from all kinds of misuse.
• Theproduct must not be used in humid, explosive or flammable environments
or close to strong magnetic fields.
• Replace thebattery as soon as thebattery warning symbol appears on
thedisplay, alow battery can cause anincorrect reading and constitute
asafety hazard.
• Neither theproduct nor its accessories may be dismantled or modified
in any way.
• Remove thebattery from themeter if it is not to be used for anextended
period.
• Turn theproduct off after use.
• If theproduct is placed close to astrong magnetic field it might cause
incorrect readings which can be corrected by removing thecause of
theinterference.
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English
UT131B
HOLD/SEL
FUSED
250V Max
10 sec Max
FUSED
200mA Max
CAT II 250V
OFF
20M
200k
20k
10 12V 9V
1.5V
2000
200
200
V
V
200m
2000m
200
20
250
250
200μ
200m
5
6
2
1
37
4
Buttons and functions
1. Display
2. [HOLD/SEL] Press this
key to hold areading, to
change between diode
mode and continuity mode
buzzer (yellow symbol).
3. : connection
for red test lead when
measuring DC current up
to 10A.
4. : connection for
theblack test lead (common).
5. [] Press to switch
thebacklight on/
off. Thelight goes off
automatically after 30 seconds
if not switched off.
6. Function selector switch
7. : connection
for red test lead when
measuring voltage,
measuring DC current
up to 0.2 A, measuring
resistance, testing diodes,
measuring continuity and
measuring temperature.
Display symbols
• TheHOLD function is engaged.
• Thebatteries need to be replaced 2×AAA/LR03, 1.5 V.
• This symbol appears when theresistor or diode is faulty or
thevoltage exceeds therange (overload). Thesymbol might also appear
when ameasurement is made with reversed polarity.
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English
UT131B
HOLD/SEL
FUSED
250V Max
10 sec Max
FUSED
200mA Max
CAT II 250V
OFF
20M
200k
20k
10 12V 9V
1.5V
2000
200
200
V
V
200m
2000m
200
20
250
250
200μ
200m
Instructions for use
Warning:
• When measuring voltage always ensure that themultimeter is switched
to thecorrect measuring range and not set to thecurrent, resistance
or diode test range. Always ensure that you use thecorrect test lead
terminal for thetype of measurement to be made.
• Use extreme caution when measuring voltages over 60 V, especially
when theobject being measured has ahigh power output.
• Make sure that theobject to be measured is not energised (conducting
any current) before connecting test leads in series with it (such as when
measuring current).
• Make sure that thecircuit to be tested is not energised before performing
resistance measurements or diode tests.
• Always ensure that thecorrect function and range is selected. If in doubt
about thecorrect range, start with thehighest and work downwards.
• Be extremely cautious when using themultimeter on aninductive
component such as atransformer, relay coil and thelike. High voltage
may be induced at themeasuring points if anopen circuit occurs.
• Make sure that thetest leads are in good condition with no damage to
theinsulation.
• If you replace thefuse, make sure that it is thecorrect type and rating.
Voltage measurement
Check thebattery status by
turning thefunction selector
to anew range. Thebattery
symbol will appear if
thebattery is low.
1. Connect theblack test lead
to COM and thered lead to
VmAµA.
2. Set thefunction selector to
V (200/250V~) or
V (200 mV – 250V) and
thedesired voltage range.
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English
3. Connect thetest leads across thecircuit to be tested.
Read thedisplayed value.
Note: If thewrong polarity is connected when measuring direct current,
aminus sign (−) will be displayed in front of thevalue.
Battery measurement
UT131B
HOLD/SEL
FUSED
250V Max
10 sec Max
FUSED
200mA Max
CAT II 250V
OFF
20M
200k
20k
10 12V 9V
1.5V
2000
200
200
V
V
200m
2000m
200
20
250
250
200μ
200m
1. Connect theblack test
lead to COM and thered
lead to VmAµA.
2. Set thefunction selector
to 12 V, 9Vor 1.5 V
depending on thetype
of battery you wish to
measure.
3. Thestatus of
themeasured battery is
described on thedisplay
as either Good, Low or
Bad:
Battery model 1.5 V 9 V 12 V
Load resistance 30 Ω 900 Ω 60 Ω
Good ≥ 1.31 V ≥ 7.8 V ≥ 10.5 V
Low 0.95–1.31 V 5.7–7.7 V 7.6–10.4 V
Bad ≤ 0.94 V ≤ 5.6 V ≤ 7.5 V
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English
DC current measurement
UT131B
HOLD/SEL
FUSED
250V Max
10 sec Max
FUSED
200mA Max
CAT II 250V
OFF
20M
200k
20k
10 12V 9V
1.5V
2000
200
200
V
V
200m
2000m
200
20
250
250
200μ
200m
1. Connect theblack test
lead to COM and thered
lead to VmAµA (for
measuring 0–200mA) or
to 10A MAX (for measuring
200mA – 10 A).
2. Set thefunction selector
switch to A .
3. Connect thetest leads
in series with theload
and source of thecurrent
to be measured. Read
thedisplayed value.
Warning:
Do not connect thetest leads in parallel with thevoltage source when
measuring voltage!
If in doubt about thecorrect measuring range, start with thehighest and
work downwards.
When measuring high currents, themultimeter should only be connected
briefly (less than 10 seconds for currents greater than 10 A). This is to
prevent theshunt inside theinstrument from overheating
Theinterval between two readings must be greater than 15 minutes.
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English
Diode testing
UT131B
HOLD/SEL
FUSED
250V Max
10 sec Max
FUSED
200mA Max
CAT II 250V
OFF
20M
200k
20k
10 12V 9V
1.5V
2000
200
200
V
V
200m
2000m
200
20
250
250
200μ
200m
1. Connect theblack test lead
to COM and thered lead
to VmAµA.
2. Set thefunction selector
switch to and press
[HOLD/SEL] to measure
thethreshold value (V) of
diodes.
3. Connect theblack test
lead to thecathode and
red test lead to theanode
of thediode to be
tested. Read theforward
voltage drop value from
thedisplay. If “ ” appears
on thedisplay, reverse
thepolarity of thediode
connections.If that doesn’t
help, thediode may be
faulty.
Warning:
Make sure that thecircuit to be tested is not energised before you begin
to test diodes. Be extremely cautious when using this instrument on
aninductive component such as atransformer, relay coil and thelike,
and make sure it has been discharged beforehand. High voltage may be
induced at themeasuring points when thecircuit is broken.
Note: Agood diode should have aforward voltage drop ranging from
0.5 to 0.8 V. However, thereverse voltage drop reading can vary alot
depending on theresistance of other paths of conductance between
thetips of thetest leads.
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English
Continuity test
UT131B
HOLD/SEL
FUSED
250V Max
10 sec Max
FUSED
200mA Max
CAT II 250V
OFF
20M
200k
20k
10 12V 9V
1.5V
2000
200
200
V
V
200m
2000m
200
20
250
250
200μ
200m
1. Connect theblack test lead
to COM and thered lead
to VmAµA. Set thefunction
selector switch to .
2. Connect theends of
thetest leads to theends of
thecables to be tested.
- No break in thecable:
Thebuzzer sounds
continuously if
theresistance is ≤ 10Ω.
- Abreak in thecable:
Thebuzzer does not
sound if theresistance
is >51Ω.
Warning:
Make sure that thecircuit to be tested is not energised before testing for continuity.
Be extremely cautious when using this instrument on aninductive
component such as atransformer, relay coil and thelike, and make sure
it has been discharged beforehand. High voltage may be induced at
themeasuring points if anopen circuit occurs.
To avoid shocks you need to be CAREFUL when you work with voltages
higher than 60 V DC or 30 V AC RMS. Voltages higher than this pose arisk
of harmful electric shocks.
Note: Theopen circuit voltage is around 2.1 V.
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