Clas Ohlson UNI-T UT133B User manual

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UNI-T UT133B
Multimeter
Multimeter UNI-T UT133B
UNI-T UT133B multimeter
Yleismittari UNI-T UT133B
Art.no. Model
36-7745 UT133B Ver. 20190705

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UNI-T Multimeter
Art.no 36-7745 Model UT133B
Please read theentire instruction manual before using theproduct and then save
it for future reference. We reserve theright for any errors in text or images and any
necessary changes made to technicaldata. In theevent of technical problems
or other queries, please contact our Customer Services (see address details on
theback).
Information about this measuring instrument
This multimeter has been constructed and tested in accordance with therequirements
of Measurement Category III (CAT III) up to 600 V nominal voltage and Pollution
Degree2.
Categorisation
Measuring instruments are classified into categories according to what kind of
electrical environment they can be used in and how safe/protective they are at
withstanding overvoltages.
The Measurement Category of theinstrument will be marked on theratingplate.
The Measurement Category indicates how capable theinstrument is of withstanding
overvoltages which could be dangerous for theuser.
In brief, thecategorisation can be described like this:
• In theevent of asudden overvoltage on thepower grid (atransient energy spike
from alightning strike for example) thedanger is greatest at thepoint where
thepower supply service cable enters abuilding.
• Further in thebuilding, theresistance (impedance) in themains supply
cables increases and connected appliances and devices reduce and divide
theovervoltage. Therefore, theMeasurement Category (also called Overvoltage
Installation Category) of themeasuring instrument indicates which electrical
environment theinstrument is designed to be usedin.
The categories that measuring instruments are classified into are:
• CAT I: For measuring electronics and products that have abuilt-in protection
from overvoltage.
• CAT II: For measuring single-phase equipment connected to ahousehold mains
supply, both through wall sockets and fixed installation.
• CAT III: For measuring electrical wiring installed in buildings. Examples are
measurements on fixed installation cables and hard-wired appliances, socket
outlets, circuit breakers and distribution boards. Three-phase distribution (all
supply cables and 3-phase equipment, machines and appliances).
• CAT IV: Three-phase at theutility connection and any outdoor conductors.
This multimeter is rated as CAT III and is approved for measuring voltages up to
600V on single-phase products. Thismultimeter must not be used for measuring
three-phase equipment, three-phase cables or distribution boards even if
thenominal voltage is not higher than 600V.

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Pollution degree
This multimeter is constructed to be able to be used in environments which contain
pollutants which are not electrically conductive, with theexception of temporary
conductivity caused by condensation.
Examples of environments with Pollution Degree 2 are dry home or office environments,
test stations and laboratories. Basically, any dry environment with normal indoor
climatic conditions.
The multimeter must not be used or stored in alocation where it can be exposed to
electrically conductive pollution of any kind (solid, liquid or gas).
The multimeter should not be exposed to relative humidity over 75%, be used in
unheated rooms and must not be used in bathrooms or outdoors where it might
getwet.
It is not designed to be used with electrical equipment used in industry or agriculture.
Safety
• The product conforms to thefollowing CE standards: EN 611010-1:2010,
EN61010-2-030:2010, EN 61326:2013, and CAT III: 600 V, Pollution Degree2.
• Make sure that theproduct is used safely by following thesafety instructions and
operating directions in this instruction manual.
• Neither theproduct nor its accessories must be dismantled or modified in anyway.
• The product must never be used if it is in any way damaged or malfunctioning.
• Make sure that thepower is turned off before working on thepower circuit.
Lowcurrent levels can also be dangerous.
• Make sure that your fingers are behind thefinger guards when using thetestleads.
• To avoid electric shocks and damage to theproduct, do not exceed theproduct’s
overload limits.
• Do not measure voltages higher than 600 V DC or 600 V AC RMS using this product.
• To avoid shocks you need to be very CAREFUL when you work with voltage
higher than 60 V DC or 35 V ACRMS. Voltages higher than this pose arisk of
harmful electric shocks.
• Never use theproduct if thebattery cover is missing or thebattery compartment
isopen.
• Replace thebatteries as soon as thebattery warning symbol appears on thedisplay,
low batteries can cause anincorrect reading and constitute asafety hazard.
• Set theright measuring range using theselector before starting to measure and
do not change therange whilst taking ameasurement.
• The product is protected by fuses, but they will not protect themeter from all
kinds of misuse.
• The product must not be used in humid, explosive or flammable environments or
close to strong magnetic fields.
• Remove thebattery if thedevice is not to be used for anextended period.
• Turn theproduct off afteruse.
• If theproduct is placed close to astrong magnetic field it might cause incorrect
readings which can be corrected by removing thecause of theinterference.

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Buttons and functions
1. Display
2. [HOLD/SELECT] Press this key to hold areading, to change between diode
mode and continuous buzzer and deactivateAPO.
3. 10A: Connection for thered test lead when measuring DC current up to 10A.
4. COM: Connection for theblack test lead (common/return).
5. [ ] Press to switch thedisplay light on/off. Thelight goes off automatically
after 30 seconds if not switchedoff.
6. [REL] Relative mode, ▲appears on thedisplay (only for capacitance
measurements).
7. Function selector switch
8. VΩmA: 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.

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Display symbols
9. : Low battery warning, change batteries (2×AAA/LR03, 1.5 V).
10. NCV: (Non-contact voltage) For measuring electromagnetic fields.
11. AC/DC: alternating current/direct current
12. H: Indicates that theHOLD function is activated.
13. : High voltage warning.
14. APO: Auto power off, thedisplay switches off automatically after 15 minutes.
15. : Diode test mode (change using the [HOLD/SELECT] button).
16. : Buzzer mode (change using the [HOLD/SELECT] button).
17. Decimal prefix for resistance measurements.
18. : Resistance measurement
19. Decimal prefix for voltage and direct current measurements.
20. A: Direct current measurement.
(overload) Appears when thereading exceeds theselected measuringrange.
Instructions for use
APO
When APO (Auto power off) is activated, themultimeter shuts off after 15 minutes
of inactivity.
• APO mode is activated automatically when themultimeter is switchedon.
• To deactivate APO mode: Hold in [HOLD/SELECT] and turn thefunction
selector from “off” to any other position.
• If theAPO mode is deactivated during along measurement, themeter will need
to be switched off manually.

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Backlight
Press [ ] to switch thebacklight on/off. Thebacklight shuts off automatically
after 30 seconds of inactivity.
AC/DC Voltage measurements
Warning
• When measuring voltage always ensure that themultimeter is switched to thecorrect
measuring range and not set to thecurrent, resistance or diode testrange.
• Use extreme caution when measuring voltages over 60 V, especially when
theobject being measured has ahigh power output.
• High voltage may be induced at themeasuring points when thecircuit is broken.
• Always ensure that thecorrect function and range is selected. Ifin doubt about
thecorrect range, start with thehighest and work downwards.
• Make sure that thetest leads are in good condition with no damage to
theinsulation.
• Always ensure that you use thecorrect test lead terminal for thetype of
measurement to bemade.
1. Connect theblack test lead to COM and thered
lead toVΩmA.
2. Set thefunction selector to 600 V~ (AC,alternating
current) or 600 mV – 600 V (DC, direct current).
3. Connect thetest leads to thecircuit to be tested
and read thevalue.
Information
If thewrong polarity is connected when measuring
direct current, aminus sign (−) will be displayed in
front of thevalue.
NCV
NCV (Non-contact voltage) is ameasuring mode that can be used to measure
thevoltage of power sockets, cables and other components through their
electromagnetic fields without making physical contact withthem.
Warning
• TheNCV function is not intended to be used to measure shielded equipment.
• Even if themeter does not indicate anelectromagnetic field, you should always
make sure that thepower is turned off before working on thecircuit. Lowcurrent
levels can also be dangerous.
• If thePhase (Live) and Neutral conductors are close to each other, it might be
impossible to determine which of them iswhich.

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1. Set thefunction selector to NCV, “EF” will appear on
thedisplay.
2. Hold thetop of themultimeter (marked “NCV” with anarrow
on top) close to thetest subject.
3. The voltage will be represented by anumber of dashes “-”
on thedisplay:
“EF” 0–50 mV
“−” 50–100 mV
“− −” 100–150 mV
“− − −” 150–200 mV
“− − − −” > 200 mV
Battery test
• When “Bad” appears on thedisplay, thebattery
needs to be replaced.
• If thebattery is under0.2 V, only aflashing
“Good”, “Low” or “Bad” will be displayed.
1. Connect theblack test lead to COM and thered
lead toVΩmA.
2. Set thefunction selector to 9Vor1.5 V depending
on thetype of battery you wish totest.
3. The status of thetested battery is described on
thedisplay as either “Good”, “Low” or “Bad”:
Battery model 1.5 V 9 V
Load resistance 30 Ω900 Ω
Good ≥ 1.31 V ≥ 7.8 V
Low 0.95–1.31 V 5.7–7.7 V
Bad ≤ 0.94 V ≤ 5.6 V
The table only provides
anapproximate value,
for more exact values
it is recommended that
thetest leads beused.
• If there are several cables with 2-phase or 3-phase cables close to one another,
try to separate them and measure each cable individually.
• Electrical cables consist of 2 or more conductors and only some of theconductors
might be carrying current at thetime of themeasurement. Therefore, always
measure all conductors in acable to get acorrectvalue.
• The NCV function only works when measuring AC (alternating current), not DC
(direct current).

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DC current measurement
Warning
• Do not connect thetest leads in parallel with thevoltage source when measuring
current!
• If in doubt about thecorrect measuring range, start with thehighest and work
downwards.
• When measuring high currents, themultimeter should only be connected briefly
(less than 30 seconds for currents greater than 10 A).
• The interval between two readings must be greater than 15 minutes.
• Make sure that thetest leads are in good condition with no damage to theinsulation.
• Always ensure that you use thecorrect test lead terminal for thetype of
measurement to bemade.
• When measuring voltage always ensure that themultimeter is switched to
thecorrect measuring range and not set to thecurrent, resistance or diode
testrange.
• Make sure that theobject to be measured is
not energised (conducting any current) before
connecting test leads in series with it (such as
when measuring current).
1. Connect theblack test lead to COM and thered
to VΩmA (for measuring 0–200 mA) or to 10A
(formeasuring between 200 mA and 10 A).
2. Set thefunction selector switch to A .
3. Connect thetest leads in series with theload and
source of thecurrent to be measured.
Capacitance measurement
Warning
Make sure that thecircuit to be tested is not
energised and that any high-voltage capacitors have
been discharged before performing capacitance
measurements.
1. Connect theblack test lead to COM and thered
lead toVΩmA.
2. Set thefunction selector to .
Information
The accuracy of readings can be improved by using therelative readings modifier
([REL]) function to subtract theresidual capacitance of themeter and thetestleads.

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Diode testing
Warning
Make sure that thecircuit to be tested is not energised and that any high-voltage
capacitors have been discharged before performing diode measurements.
1. Connect theblack test lead to COM and thered
test lead toVΩmA.
2. Set thefunction selector switch to .
3. Press the [HOLD/SELECT] button to toggle
between buzzer mode and diode testmode.
4. Connect theblack test lead to thecathode
(negative end) and red test lead to theanode
(positive end) of thediode to be tested.
5. Read theforward voltage drop value from
thedisplay.
Information
If is displayed, thediode is either open or thepolarity is reversed. Tryreversing
thepolarity of thediode. Thenormal value for aP–N junction is about 500–800 mV
(0.5–0.8 V).
Continuity test
Warning
Make sure that thecircuit to be tested is not energised and that any high-voltage
capacitors have been discharged before performing continuitytests.
1. Connect theblack test lead to COM and thered
test lead toVΩmA. Setthefunction selector
switch to .
2. Connect theends of thetest leads to theends of
thecables to be tested.
- No break in thecable: The buzzer sounds
continuously if theresistance in thecable is
≤ 10Ω.
- A break in thecable: The buzzer does not
sound if theresistance in thecable is >50Ω.