Clas Ohlson UT33D Manuale utente
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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 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
The multimeter 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.
The meter 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.
The categorisation is described briefly below:
In theevent of avoltage surge in theelectricity grid (a transient 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.
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 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.
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Contamination level
The meter 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.
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 getwet.
It is not intended for use with electrical equipment which is used in industry or agriculture.
Safetyinstructions
• The multimeter has been tested in accordance with theEMC Directive 2004/108/EC
and theLow Voltage Directive 2006/95/EG, and fulfils installation category
(overvoltage category) II 250 V, contamination level 2 in accordance with
EN61010–1:2010 and EN61010-031:2002/A1:2008.
• The meter is designed for indoor use at operating temperatures in therange 0–40˚C.
• Make sure that themeter is used safely by following all safety instructions and
operating directions.
• Do not use this meter if it or thetest leads appear to be damaged, or if you
suspect that themeter might not be working properly.
• Make sure that your fingers are behind thefinger guards when using thetestleads.
• Make sure that thepower is turned off before working on power circuits. Evenlow
voltages can be dangerous!
• Do not measure voltages higher than 250 V DC or 250 V AC RMS using themeter.
• 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 arisk of heavy
electric shocks.
• Set theright measuring range using theselector before starting to measure and do
not change therange whilst taking ameasurement.
• Never use themeter if thebattery cover is missing or thebattery compartment
isopen.
• To avoid electric shocks and damage to themeter, do not exceed themeter’s
measurement limits. Theguarantee is void if themultimeter is used incorrectly.
• This multimeter is protected by fuses, but they will not protect theinstrument 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 thebattery immediately if thebattery warning symbols appears on
thedisplay. Aweak battery can cause incorrect results and thereby pose asafety
hazard.
• Neither themeter nor its accessories may be dismantled or modified in anyway.
• Remove thebattery from themeter if it is not to be used for anextended period.
• Turn themeter off afteruse.
• If themeter is placed close to astrong magnetic field, it might cause incorrect
readings which can be corrected by removing thecause of theinterference.
Buttons and functions
1. Display
2. [HOLD] Press to lock
themeasured value.
3. : connection for red
test lead when measuring DC
current up to 10A.
4. : connection for
red test lead when measuring
voltage, DC current up to
0.2 Aand resistance, and for
testing diodes and continuity.
5. [ ] Switch display lighting
on/off. Note: Thedisplay
light does not switch off
automatically, it needs to be
switched off manually.
6. Function selector switch
7. : connection for
theblack test lead (common).
Display symbols
: Thebatteries needs replacing.
:Thetest leads are connected with thewrong polarity to either theinstrument or
theobject being measured.
OL: Thereading is outside of themeasuring range.
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Operating instructions
Warning!
• Before measuring voltage, always ensure that themeter is set to thecorrect
function range and not set to current, resistance or diode test measurement.
Alwaysensure that you use thecorrect test lead socket for thetype of
measurement to bemade.
• Use extreme caution when measuring voltages over 60 V, especially when
thecircuit being measured has ahigh power output.
• Make sure that thecircuit 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 thecircuit to be tested is not conducting any current before
performing resistance measurements or diodetests.
• Always ensure that thecorrect function and range are selected. Ifin doubt about
thecorrect range, start with thehighest and work downwards.
• Take extreme care when using themeter on aninductive component such
as atransformer, relay coils and thelike. Highvoltage 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 by rotating themultifunction selector to anew measuring function.
Thebattery symbol will appear if thebattery starts to runlow.
1. Connect theblack test lead to and
thered test lead to .
2. Setthefunction selector to
(200/250 V~) or (200 mV – 250 V)
and therequired measuring range for
voltage measurement.
3. Connect thetest leads across thevoltage
source to be measured. Readthevalue.
Note: Iftheincorrect polarity is connected
when measuring DC voltages, thedisplay will
show (minus) before thereading.
Note:
In each range, themeter has aninput impedance of 10 MΩ except themV range,
which has aninput impedance of 3000 MΩ. Thiscan cause measurement errors in
high impedance circuits. Ifthecircuit impedance is less than or equal to 10 kΩ,
theerror is negligible (0.1 % or less).
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DC current measurement
1. Connect theblack test lead to
and thered test lead to
(for 0–200 mA) or to (for therange
200 mA – 10 A).
2. Setthemultifunction selector to .
3. Connect thetest leads in series with
thecurrent source to be measured.
Readthevalue.
Warning!
Do not connect theleads in parallel with
thevoltage source when measuring current!
If in doubt about thecorrect range, start with
thehighest and work downwards.
When measuring high currents, themeter should only be connected briefly (less than
10 seconds for currents over 5 A). Thisis to prevent theshunt in theinstrument from
overheating.
The interval between two readings must be greater than 15 minutes.
Resistance measurement
1. Connect theblack test lead to and
thered test lead to .
2. Setthemultifunction selector to and
therequired range for resistance measurement.
3. Connect thetest leads across thecircuit to
be tested. Readthevalue.
Warning: Ensurethat thecircuit to be tested is
not “live” before taking any measurements.
In order to avoid therisk of personal injury, never
measure components with avoltage higher than
60 V DC or 30 V AC.
The test leads can add 0.1–0.2 Ω to theactual resistance measured. Toobtain accurate
readings of low-resistance components, short-circuit theinput sockets beforehand,
record theshort-circuited reading and use it to remove thelead resistance error from
thereading on thedisplay.
If theshort-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 thereading to take several
seconds to stabilize.
For maximum accuracy, leads that are of thehighest possible quality and as short as
possible should beused.
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Diode testing
1. Connect theblack test lead to and
thered test lead to .
2. Setthemultifunction selector to
for measuring diode threshold value (V).
3. Connect theblack test lead to thecathode
and red test lead to theanode of thediode
to be tested. Readtheforward voltage
drop value from thedisplay. If“1” appears
on thedisplay, reverse thepolarity of
thediode.
Warning!
Make sure that thecircuit to be tested is not conducting any current before testingdiodes.
Take extreme care when using this instrument on aninductive component such as
atransformer, relay coils and thelike, and make sure they have been discharged before-
hand. Highvoltage may be induced at themeasuring points if anopen circuit occurs.
Note: Agood diode should have aforward voltage drop of from 0.5 to 0.8 V.
However,thereverse voltage drop reading can vary considerably depending on
theresistance to other paths of conductance between thetips of thetestleads.
Continuity measurement
1. Connect theblack test lead to and
thered test lead to .
2. Setthemultifunction selector to .
3. Connect theends of thetest leads to
theends of thecables to be tested.
- No break in thecable: Thebuzzer
sounds continuously if theresistance is
<10Ω.
- Break in thecable: Thebuzzer does not
sound if theresistance is >70Ω.
Warning!
Make sure that thecircuit to be tested is not
conducting any current before testing for
continuity.
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Take extreme care when using this instrument on aninductive component such as
atransformer, relay coils and thelike, and make sure they have been discharged
beforehand. Highvoltage may be induced at themeasuring points if anopen circuit occurs.
To avoid shocks, you must be CAREFUL when working with voltages higher than 60V DC
or 30 V AC RMS. Voltages higher than this pose arisk of heavy electric shocks.
Note: Theopen-circuit voltage is around 2.3–2.5V.
Square wave
Warning: Do not load themultimeter with voltages higher than 10V when measuring
square waves.
1. Connect theblack test lead to and thered
test lead to .
2. Set thefunction selector to .
3. Read themeasurement on thedisplay.
Note:
• Thefrequency is approximately 50Hz.
• Theoutput voltage range will be over 3 Vp-p
(peak-to-peak) at aninput impenance of 1 MΩ.
• When you have finished measuring thecircuit,
disconnect thetest leads from theobject being
measured.
Care and maintenance
• Clean theexterior of themultimeter by wiping it with adamp cloth. Use only mild
cleaning agents, never solvents or corrosive chemicals.
• Whenever it is not to be used for anextended period, thebattery should be removed
from themultimeter and it should be stored in adry, dust-free environment, out of
children’s reach.
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Changing thebattery
1. Disconnect thetest leads from themultimeter.
2. Turn thefunction selector to OFF.
3. Undo thetwo screws holding theback
cover on and remove it from themultimeter.
4. Take thebattery out of thebattery
compartment.
5. Insert anew battery (1×9V/6LR61).
Note thepolarity markings on thebottom
of thebattery compartment to ensure
correct insertion.
6. Put thebattery cover back on and tighten
thescrews.
Replacing thefuses
1. Disconnect thetest leads from themultimeter.
2. Turn thefunction selector to OFF.
3. Undo thetwo screws holding theback cover
on and remove it from themultimeter.
4. Replace thefuse/fuses with equivalent
fuses to theone/s you remove.
- 1×10 A, 600 V, F (fast-blow),
6×25 mm
- 1×200mA, 250V, F (fast-blow),
5×20mm
5. Put thebattery cover back on and tighten
thescrews.
Indice
Lingue:
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