Clas Ohlson UT33D User manual

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Multimeter
Multimeter
Multimeter
Yleismittari
Multimeter
Art.no Model
36-6247 UT33D Ver. 20160404

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UNI-T UT33D Multimeter
Art.no 36-6247 Model UT33D
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 themeter
The multimeter has been designed and tested in accordance with therequirements for
installation category II up to nominal voltages of 250V and acontamination level of2.
Categorisation
Meters are divided into different categories depending on theelectrical environment
in which they are to be used and how safe/protective they are in theevent of
avoltagesurge.
The meter label should indicate which category it belongs to. Thecategorisation also
determines how safe theinstrument is with regards to any overvoltage which could
represent ahazard for theuser.
The categorisation is described briefly below:
In theevent of avoltage surge in theelectricity grid (a transient from alightning strike,
etc.), therisk will be greatest where themains supply cable enters thebuilding, for
example. Further inside thebuilding, theresistance (impedance) in thecables will
increase and connected devices will reduce and dissipate theovervoltage. Themeter
category will therefore determine which electrical environment theinstrument is
designed to be usedin.
The categories 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 thebuilding’s
electrical power supply system. Bothplug-connected and permanently installed.
• Category III: For measuring thebuilding’s electrical systems. Permanently installed
cables, sockets, fuse boxes and switchgear cabinets. Three-phase distribution
(allpower 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 250V in single-phase products. Themeter must not be used for
measuring three-phase products, three-phase conductors or switchgear cabinets
even if thenominal voltage does not exceed 250V.

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Contamination level
The meter is designed for use in environments in which contaminants which do
not conduct electricity are present. Withtheexception 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. Inother words, rooms which have
anormal indoor climate.
The meter must not be used or stored in rooms where it could be exposed to
electrically conductive contaminants in any form (solid, liquid or gas).
The meter 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 getwet.
It is not intended for use with electrical equipment which is used in industry or agriculture.
Safetyinstructions
• The multimeter has been tested in accordance with theEMC Directive 2004/108/EC
and theLow Voltage Directive 2006/95/EG, and fulfils installation category
(overvoltage category) II 250 V, contamination level 2 in accordance with
EN61010–1:2010 and EN61010-031:2002/A1:2008.
• The meter is designed for indoor use at operating temperatures in therange 0–40˚C.
• Make sure that themeter is used safely by following all safety instructions and
operating directions.
• Do not use this meter if it or thetest leads appear to be damaged, or if you
suspect that themeter might not be working properly.
• Make sure that your fingers are behind thefinger guards when using thetestleads.
• Make sure that thepower is turned off before working on power circuits. Evenlow
voltages can be dangerous!
• Do not measure voltages higher than 250 V DC or 250 V AC RMS using themeter.
• To avoid shocks you need to be CAREFUL when you work with voltage higher
then 60 V DC or 30 V AC RMS. Voltages higher than this pose arisk of heavy
electric shocks.
• Set theright measuring range using theselector before starting to measure and do
not change therange whilst taking ameasurement.
• Never use themeter if thebattery cover is missing or thebattery compartment
isopen.
• To avoid electric shocks and damage to themeter, do not exceed themeter’s
measurement limits. Theguarantee is void if themultimeter is used incorrectly.
• This multimeter is protected by fuses, but they will not protect theinstrument from
all kinds of misuse.
• The meter must not be used or stored in hot/humid, explosive or flammable
environments or close to strong magnetic fields.

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• Replace thebattery immediately if thebattery warning symbols appears on
thedisplay. Aweak battery can cause incorrect results and thereby pose asafety
hazard.
• Neither themeter nor its accessories may be dismantled or modified in anyway.
• Remove thebattery from themeter if it is not to be used for anextended period.
• Turn themeter off afteruse.
• If themeter is placed close to astrong magnetic field, it might cause incorrect
readings which can be corrected by removing thecause of theinterference.
Buttons and functions
1. Display
2. [HOLD] Press to lock
themeasured value.
3. : connection for red
test lead when measuring DC
current up to 10A.
4. : connection for
red test lead when measuring
voltage, DC current up to
0.2 Aand resistance, and for
testing diodes and continuity.
5. [ ] Switch display lighting
on/off. Note: Thedisplay
light does not switch off
automatically, it needs to be
switched off manually.
6. Function selector switch
7. : connection for
theblack test lead (common).
Display symbols
: Thebatteries needs replacing.
:Thetest leads are connected with thewrong polarity to either theinstrument or
theobject being measured.
OL: Thereading is outside of themeasuring range.

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Operating instructions
Warning!
• Before measuring voltage, always ensure that themeter is set to thecorrect
function range and not set to current, resistance or diode test measurement.
Alwaysensure that you use thecorrect test lead socket for thetype of
measurement to bemade.
• Use extreme caution when measuring voltages over 60 V, especially when
thecircuit being measured has ahigh power output.
• Make sure that thecircuit to be measured is not “live”, i.e. conducting any current,
before connecting test leads in series with it (such as when measuring current).
• Make sure that thecircuit to be tested is not conducting any current before
performing resistance measurements or diodetests.
• Always ensure that thecorrect function and range are selected. Ifin doubt about
thecorrect range, start with thehighest and work downwards.
• Take extreme care when using themeter on aninductive component such
as atransformer, relay coils and thelike. Highvoltage may be induced at
themeasuring points if anopen circuit occurs.
• Make sure that thetest leads are in good condition with no damage to theinsulation.
• If you replace thefuse, make sure that it is thecorrect type and rating.
Voltage measurement
Check thebattery by rotating themultifunction selector to anew measuring function.
Thebattery symbol will appear if thebattery starts to runlow.
1. Connect theblack test lead to and
thered test lead to .
2. Setthefunction selector to
(200/250 V~) or (200 mV – 250 V)
and therequired measuring range for
voltage measurement.
3. Connect thetest leads across thevoltage
source to be measured. Readthevalue.
Note: Iftheincorrect polarity is connected
when measuring DC voltages, thedisplay will
show (minus) before thereading.
Note:
In each range, themeter has aninput impedance of 10 MΩ except themV range,
which has aninput impedance of 3000 MΩ. Thiscan cause measurement errors in
high impedance circuits. Ifthecircuit impedance is less than or equal to 10 kΩ,
theerror is negligible (0.1 % or less).

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DC current measurement
1. Connect theblack test lead to
and thered test lead to
(for 0–200 mA) or to (for therange
200 mA – 10 A).
2. Setthemultifunction selector to  .
3. Connect thetest leads in series with
thecurrent source to be measured.
Readthevalue.
Warning!
Do not connect theleads in parallel with
thevoltage source when measuring current!
If in doubt about thecorrect range, start with
thehighest and work downwards.
When measuring high currents, themeter should only be connected briefly (less than
10 seconds for currents over 5 A). Thisis to prevent theshunt in theinstrument from
overheating.
The interval between two readings must be greater than 15 minutes.
Resistance measurement
1. Connect theblack test lead to and
thered test lead to .
2. Setthemultifunction selector to and
therequired range for resistance measurement.
3. Connect thetest leads across thecircuit to
be tested. Readthevalue.
Warning: Ensurethat thecircuit to be tested is
not “live” before taking any measurements.
In order to avoid therisk of personal injury, never
measure components with avoltage higher than
60 V DC or 30 V AC.
The test leads can add 0.1–0.2 Ω to theactual resistance measured. Toobtain accurate
readings of low-resistance components, short-circuit theinput sockets beforehand,
record theshort-circuited reading and use it to remove thelead resistance error from
thereading on thedisplay.
If theshort-circuited reading is higher than 0.5 Ω, check whether any connection/test
lead is loose or damaged.
For high-resistance measurement (>1 MΩ), it is normal for thereading to take several
seconds to stabilize.
For maximum accuracy, leads that are of thehighest possible quality and as short as
possible should beused.

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Diode testing
1. Connect theblack test lead to and
thered test lead to .
2. Setthemultifunction selector to
for measuring diode threshold value (V).
3. Connect theblack test lead to thecathode
and red test lead to theanode of thediode
to be tested. Readtheforward voltage
drop value from thedisplay. If“1” appears
on thedisplay, reverse thepolarity of
thediode.
Warning!
Make sure that thecircuit to be tested is not conducting any current before testingdiodes.
Take extreme care when using this instrument on aninductive component such as
atransformer, relay coils and thelike, and make sure they have been discharged before-
hand. Highvoltage may be induced at themeasuring points if anopen circuit occurs.
Note: Agood diode should have aforward voltage drop of from 0.5 to 0.8 V.
However,thereverse voltage drop reading can vary considerably depending on
theresistance to other paths of conductance between thetips of thetestleads.
Continuity measurement
1. Connect theblack test lead to and
thered test lead to .
2. Setthemultifunction selector to .
3. 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 is
<10Ω.
- Break in thecable: Thebuzzer does not
sound if theresistance is >70Ω.
Warning!
Make sure that thecircuit to be tested is not
conducting any current before testing for
continuity.

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Take extreme care when using this instrument on aninductive component such as
atransformer, relay coils and thelike, and make sure they have been discharged
beforehand. Highvoltage may be induced at themeasuring points if anopen circuit occurs.
To avoid shocks, you must be CAREFUL when working with voltages higher than 60V DC
or 30 V AC RMS. Voltages higher than this pose arisk of heavy electric shocks.
Note: Theopen-circuit voltage is around 2.3–2.5V.
Square wave
Warning: Do not load themultimeter with voltages higher than 10V when measuring
square waves.
1. Connect theblack test lead to and thered
test lead to .
2. Set thefunction selector to .
3. Read themeasurement on thedisplay.
Note:
• Thefrequency is approximately 50Hz.
• Theoutput voltage range will be over 3 Vp-p
(peak-to-peak) at aninput impenance of 1 MΩ.
• When you have finished measuring thecircuit,
disconnect thetest leads from theobject being
measured.
Care and maintenance
• Clean theexterior of themultimeter by wiping it with adamp cloth. Use only mild
cleaning agents, never solvents or corrosive chemicals.
• Whenever it is not to be used for anextended period, thebattery should be removed
from themultimeter and it should be stored in adry, dust-free environment, out of
children’s reach.

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Changing thebattery
1. Disconnect thetest leads from themultimeter.
2. Turn thefunction selector to OFF.
3. Undo thetwo screws holding theback
cover on and remove it from themultimeter.
4. Take thebattery out of thebattery
compartment.
5. Insert anew battery (1×9V/6LR61).
Note thepolarity markings on thebottom
of thebattery compartment to ensure
correct insertion.
6. Put thebattery cover back on and tighten
thescrews.
Replacing thefuses
1. Disconnect thetest leads from themultimeter.
2. Turn thefunction selector to OFF.
3. Undo thetwo screws holding theback cover
on and remove it from themultimeter.
4. Replace thefuse/fuses with equivalent
fuses to theone/s you remove.
- 1×10 A, 600 V, F (fast-blow),
6×25 mm
- 1×200mA, 250V, F (fast-blow),
5×20mm
5. Put thebattery cover back on and tighten
thescrews.