Clas Ohlson UT203 User manual

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Clamp Ammeter
Tångamperemeter
Tangamperemeter
Pihtiampeerimittari
Art.no Model
36-4718 UT203 Ver. 201201

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English
Clamp Ammeter
Art.no 36-4718 Model UT203
Please read theentire instruction manual before use and save it for future reference.
Wereserve theright for any errors in text or images and for making any necessary
technical changes to this document. Ifyou should have any questions concerning
technical problems please contact our Customer Services.
Table of Contents
1. Description ................................................................4
2. Safetyinstructions ....................................................4
2.1 International symbols ............................................................ 5
3. Package contents .....................................................6
4. Description ................................................................6
4.1 Functions ................................................................................ 6
4.2 Display symbols ..................................................................... 8
4.3 The function buttons can be used in thefollowing modes .. 9
5. Operation ..................................................................9
5.1 Voltage measurement (V DC) or (V AC) ................................. 9
5.2 Measuring resistance (Ω) ..................................................... 10
5.3 Diode testing ........................................................................ 11
5.4 Continuity test ...................................................................... 12
5.5 Frequency measurement ..................................................... 12
5.6 Duty Cycle measurement .................................................... 13
5.7 AC or DC current measurement .......................................... 13
5.8 Automatic shut-off feature................................................... 14

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6. Changing batteries .................................................14
7. Cleaning ..................................................................15
8. Disposal ..................................................................15
9. Specifications .........................................................15
9.1 General Specifications ......................................................... 15
9.2 Operating environment ........................................................ 16
9.3 Electrical specifications ....................................................... 16
9.4 Example on accuracy .......................................................... 19

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1. Description
• Advanced True RMS clamp-onmeter
• AC, DC, capacitance, resistance and frequency measurements, diode test
andbuzzer
• Automatic shut-off
• Rubber-clad shock-absorbent casing
• Comes with test leads and 9 V battery
• Max jaw opening 28mm
• Size 208×76×30mm
2. Safetyinstructions
• This meter is designed and tested to conform to IEC 61010–1, installation
category (overvoltage category) II 600 V, III 300 V and pollution category II.
• This meter conforms to thefollowing EMC Directives: 89/336/EEC
(EMCNovember 1992, electromagnetic compatibility), Low-Voltage Directive
73/23/EEC, EN61010-1 (04, 93).
• This meter is designed for indoor use at working temperatures in therange
of0–40 °C.
• Read all thesafety information and operating instructions and only use themeter
as specified in this manual.
• Do not use this meter if it or thetest leads appear to be damaged, or if you
suspect that themeter might not work 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 thepower circuit as
even small currents can be dangerous.
• Do not measure voltages over 600 V DC or 600 V AC RMS between apower
point and earth connection.
• To avoid shocks you need to be CAREFUL when you work with voltage higher
than 60 V DC or 30 V AC RMS. Voltages higher than this pose arisk of heavy
electric shocks.
• Set therotary selector switch to thecorrect range and function before starting to
take readings. Thefunction must not be changed during ameasurement.
• Never use themeter if thebattery cover or battery compartment isopen.
• To avoid electric shocks and damage to themeter, do not exceed themeter’s
overload limits. Theguarantee will not apply if themeter is used incorrectly.
• This meter is protected by fuses, but they will not protect themeter from all
kinds of misuse.
• The meter must not be used in humid, explosive or flammable environments or
close to strong magnetic fields.
• 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.

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• Neither themeter nor its accessories may be dismantled or modified in anyway.
• This meter is only intended for indoor use.
• 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.
• Never measure current with thetest leads plugged into any of theinput terminals.
• To avoid damaging themeter, never exceed themaximum input values of
themeasuring data.
• Be very careful when working close to uninsulated conductors. Touching alive
cable or conductor can give you anelectric shock.
• Only use themeter theway described in this instruction manual.
2.1 International symbols
AC (alternating current)
DC (direct current)
AC orDC
Earthconnection
Doubleinsulated
Readthemanual before use
Lowbattery warning
Continuity test (buzzer)
Diode
Fuse
EU standard compliant

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3. Package contents
• Clamp Ammeter
• 9 V battery
• Carrying strap
• Test leads (1 pair)
• Instruction manual
• Storage case
4. Description
4.1 Functions
2
3
4
5
6
7
1

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1. Jawopening trigger
2. Safetycollar for preventing hands from touching theobject being measured.
3. Transformer jaws for current measurement, theobject being measured must
pass through thecentre of thejaws vertically.
4. Function selector switch
Mode Function
The meter is switched off
AC or DC voltage measurement
Resistance measurement
Diode test or continuity measurement
Frequency measurement or duty cycle
AC and DC current measurement up to 40A
AC and DC current measurement up to 400A
5. Function buttons:
A. [ Select ]
• Selectafunction for theblue settings on thefunction selector switch.
• Pressto reactivate themeter if it has gone into standby mode.
B. [ Rel Δ ]
Function selector for or mode:
• Activate manual selection of measuring range (automatic selection is preset).
• Selectameasuring range (once manual mode has been activated).
Function selector in mode:
• Pressonce to activate RELmode.
• Pressto subtract earlier reading from thecurrent reading and display
therelative reading. Example: Ifthestored value is 20.0 V and thepresent
value is 22.0 V, thereading would be 2.0 V if theREL function is activated.
Function selector in mode.
Select frequency measurement or duty cycle . Thebuzzer sounds once as
you change function.
C. [ HOLD ]
Press to hold thecurrent reading. Thebuzzer sounds once and appears on
thedisplay when Hold is activated. Pressthebutton once again to deactivate
theHold function.
6. LCD display
7. Testlead input terminals

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4.2 Display symbols
8. AC voltage measurement
9. Indicates anegative reading
10. DC voltage measurement
11. Battery low, replace at earliest convenience to prevent erroneous readings and
therisk of dangerous consequences
12. The True RMS mode is activated
13. Automatic selection of themeasuring range with best resolution
14. Measurement value
15. Duty Cycle measurement
16. Hold is activated (saves thecurrent reading)
17. REL function is activated, relative reading - subtracts earlier reading from
thecurrent reading
18. DiodeTest
19. Continuity Test, buzzer activated
20. Resistance measurement Ω ohms, kΩ (1000 ohms) or MΩ (1,000,000 ohms)
21. Frequency measurement Hz
22. Current measurement A
23. Voltage measurement V, mV (0.001 volts)
8
9
10
11
12 13 14 15 16 17 18
19
20
22
21
23

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4.3 The function buttons can be used in thefollowing modes
Function selector
setting
Function buttons
[ Select ] [ Rel Δ ] [ HOLD ]
● ● ●
● ●
● ●
● ●
● ● ●
● ● ●
5. Operation
To give as accurate areading as possible, always place thetest object in thecentre
of theclamp when measuring.
If thedisplay does not alter during measurement, check if theHold function is
activated. appears on thedisplay when Hold is activated.
5.1 Voltage measurement (V DC) or (V AC)
Warning:
In order to avoid personal injury or damage to themeter, do not measure voltages
over 600 V DC or 600 V ACRMS.
1. Connect theblack test lead to
theCOM input terminal and
thered test lead to theupper
input terminal.
2. Setthefunction selector to .
3. Press[ Select ] and choose either
or .
4. Connect thetest leads to
thecircuit. Themeasuring range
is selected automatically (if
shows on thedisplay).
5. Press[ Rel Δ ] if you wish to
change themeasuring range
manually.
6. Readthevalue; press [ HOLD ]
if you have difficulty seeing
thedisplay or if you wish to save
thereading.
7. Press[ HOLD ] again to exit
themeasurement mode.
8. Disconnect thetestleads.

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Voltage measurement ranges
• DC: 400 mV, 4 V, 40 V, 400 V and 600V.
• AC: 4 V, 40 V, 400 V and 600V.
• appears on thedisplay if themeasured value is outside thelimits of
themeasuring range and anaccurate reading cannot be displayed.
5.2 Measuring resistance (Ω)
Warning: Beforemeasuring theresistance of acircuit, first shut thepower off and
make sure that any capacitors in thecircuit are discharged.
1. Checkthat thecircuit is not car-
rying any current and discharge
all capacitors before measuring.
2. Setthefunction selector to .
3. Connect theblack test lead to
theCOM input terminal and
thered test lead to theupper
input terminal.
4. Connect thetest leads to
thecircuit. Themeasuring range
is selected automatically (if
shows on thedisplay).
5. Press[ Rel Δ ] if you wish to
change themeasuring range
manually.
6. Readthevalue; press [ HOLD ]
if you have difficulty seeing
thedisplay or if you wish to save
thereading.
7. Press[ HOLD ] again to exit
themeasurement mode.
8. Disconnect thetestleads.
Resistance measurement ranges
400 Ω, 4 kΩ, 40 kΩ, 400 kΩ, 4MΩ
and 40MΩ.

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5.3 Diode testing
Warning:
• Make sure that thecircuit to be tested is not conducting any current before
testing diodes.
• Be extremely cautious when using this meter 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.
1. Connect theblack test lead to
theCOM input terminal and
thered test lead to theupper
input terminal.
2. Setthefunction selector to
for diode threshold
value testing.
3. TheDiode Test function is
preselected ( should
be shown on theright of
thedisplay). Ifthesymbol is
not displayed: Press[ Select ]
therequired number of times
to select DiodeTest.
4. Connect thetest leads to
thecircuit.
5. 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 appears on
thedisplay, reverse thepolarity
of thediode connections.
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 alot depending on
theresistance of other paths of conductance between thetips of thetestleads.

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5.4 Continuity test
Warning: Beforemeasuring thecontinuity of acircuit, first shut thepower off and
make sure that any capacitors in thecircuit are discharged.
5.5 Frequency measurement
Warning: In order to avoid personal injury or damage to themeter, do not measure
voltages over 600 V DC or 600 V ACRMS.
1. Connect theblack test lead to
theCOM input terminal and thered
test lead to theupper input terminal.
2. Setthefunction selector to .
3. Press[ Select ] until you enter
theContinuity Test mode ( should
appear on theright of thedisplay).
4. Connect thetest leads to thecircuit.
Iftheresistance is less than 50Ω,
thebuzzer will sound. Thebuzzer
emits alow-volume signal at resistan-
ces of 50–100 Ω. Ifthecircuit is open
(no continuity) creating aresistance
greater than 100 Ω, thebuzzer will
notsound.
5. Disconnect thetestleads.
1. Connect theblack test lead to theCOM
input terminal and thered test lead to
theupper input terminal.
2. Setthefunction selector to .
3. TheFrequency measurement function
is preselected ( should be shown on
theright of thedisplay).
4. Connect thetest leads to thecircuit.
5. Disconnect thetestleads.
Frequency measurement ranges
• 10 Hz, 100 Hz, 1 kHz, 10 kHz, 100 kHz,
1 MHz and 10MHz.
• appears on thedisplay if
themeasured value is outside thelimits
of themeasuring range and anaccurate
reading cannot be displayed.

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5.6 Duty Cycle measurement
Warning:
In order to avoid personal injury or damage to themeter, do not measure voltages
over 600 V DC or 600 V ACRMS.
1. Connect theblack test lead to theCOM
input terminal and thered test lead to
theupper input terminal.
2. Setthefunction selector to .
3. Press[ Select ] until you enter theDuty
Cycle mode ( should appear on
theright of thedisplay).
4. Connect thetest leads to thecircuit.
5. Disconnect thetestleads.
Duty Cycle measurement range
0.1–99.9%
5.7 AC or DC current measurement
Disconnect thetest leads from themeter before measuring current.
1. Setthefunction selector to or .
2. Press[ Select ] and choose thedesired measuring
range ( or appears on theleft of thedisplay).
3. Holdthemeter motionless in afirm grip, themea-
suring sensors are sensitive to vibrations, heat and
magnetic fields. Vibrations can cause errors.
4. Press[ Rel Δ ] to clear thedisplay.
5. Opentheclamp and enclose one of thecon-
ductors, keep theconductor in thecentre
of theclamp and between themarkings on
thejaws. Closethejaws of theclamp carefully.
Note:Leave no gap between thejaws of
theclamp when measuring. Onlymeasure one
conductor at atime; themeasurement of several
conductors simultaneously can lead to errors.
6. Readthevalue; press [ HOLD ] if you have difficulty
seeing thedisplay or if you wish to save thereading.
7. Press[ HOLD ] again to exit themeasurement mode.
Current measurement range: 40–400A.

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5.8 Automatic shut-off feature
• To preserve battery life, themeter has anauto shut-off feature. Ifthefunction
selector is not turned within 15 minutes, themeter turns itself off.
• The buzzer sounds about 5 times in final minute before themeter shuts off and
ends with one final longbuzz.
• The meter can be turned on again by pressing any of thebuttons or turning
thefunction selector.
• Deactivate theauto shut-off as follows: Holddown [ Select ] when switching
themeteron.
6. Changing batteries
Change batteries when is shown on thedisplay.
Warning:
Disconnect thetest leads from thetest object and themeter and make sure that
theclamp is not near aconductor before changing thebattery.
1. Turnthemeter off and remove
thetestleads.
2. Unscrew thebattery cover.
3. Slidethebattery cover 1–2 cm
in thedirection of thearrow
and remove it.
4. Removetheold battery and
insert anew 9 V battery (6F22)
observing thecorrect polarity.
5. Replace thebattery cover and
tighten thescrew.

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9.2 Operating environment
This meter is only intended for indoor use.
Use Upto 2000 m above sealevel
Storage Upto 10,000 m above sealevel
Operating temperature 0–30 °C (≤ 85 % RH)
30–40 °C (≤ 75 % RH)
40–50 °C (≤ 45% RH)
Storage temperature –20 °C to +60 °C (≤ 85 % RH)
9.3 Electrical specifications
A. DC Voltage
Range Resolution Accuracy Overload protection
400.0mV 0.1mV ±(0.8 % + 3) 600 V DC/AC
4.000V 1mV ±(0.8 % + 1)
40.00V 10mV
400.0V 100mV
600V 1V ±(1 % + 3)
Remark: Input impedance 10MΩ.
B. AC Voltage
Range Resolution Accuracy Overload protection
4.000V 1mV ±(1 % + 5) 600 V DC/AC
40.00V 10mV
400.0V 100mV
600V 1V ±(1.2 % + 5)
Remark
• Input impedance 10MΩ / less than 100pF.
• Frequency response 40–400Hz.

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C. Resistance
Range Resolution Accuracy Overload protection
400.0Ω 100mΩ ±(1.2 % + 2) 600Vp
4.000kΩ 1Ω ±(1 % + 2)
40.00kΩ 10Ω
400.0kΩ 100Ω
4.000MΩ 1kΩ ±(1.2 % + 2)
40.00MΩ 10kΩ ±(1.5 % + 2)
D. Diodetest
Range Resolution Accuracy Overload protection
1mV Display forward voltage
drop nearest value
600Vp
Remark: Open circuit voltage approximate 1.48V.
E. Continuity test
Range Resolution Accuracy Overload protection
100mΩ Around ≤ 50Ω.
the buzzer beeps
600Vp
Remark
• Open circuit voltage approximate 0.45V.
• The buzzer may or may not beep when the resistance of a circuit under test is
between 50–100 Ω.
• The buzzer will not beep when the resistance of a circuit under test is > 100Ω.

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F. Frequency
Range Resolution Accuracy Overload protection
10Hz 0.001Hz ±(0.1 % + 3) 600Vp
100Hz 0.01Hz
1kHz 0.1Hz
10kHz 1Hz
100kHz 10Hz
1MHz 100Hz
10MHz 1kHz For reference only
Remark
Input Sensitivity as follows:
• When ≤ 100kHz: ≥ 300mV rms
• When > 100kHz: ≥ 600mV rms
• When > 1MHz: ≥ 800mV rms
G. Dutycycle
Range Resolution Accuracy Overload protection
0.1–99.9 % 0.1 % For reference only 600Vp
H. DC Current
Range Resolution Accuracy Overload protection
40A 0.01A ±(2 % + 5) 400 A DC/AC
400A 0.1A ±(2 % + 3)
Warning!
The operating temperature must be 0–40 °C when measuring current.
Remark: If the reading is positive, the current direction is from bottom to top.
I. AC Current
Range Resolution Accuracy Frequency
range
Overload
protection
40A 0.01A ±(2.5 % + 8) 50–60Hz 400 A DC/AC
400A 0.1A ±(2.5 % + 5)
Warning!
The operating temperature must be 0–40 °C when measuring current.

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9.4 Example on accuracy
Range Resolution Accuracy
4 V 0.001V ±(0.8% +1)
Measurement 3.868V
Accuracy ±0.8% of measurement, i.e. 3.837 to 3.899V
+ 1 = 1 digit up/down on the last decimal,
i.e. 3.837–0.001=3.836 to 3.899+0.001=3.900V

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Tångamperemeter
Art.nr 36-4718 Modell UT203
Läs igenom hela bruksanvisningen före användning och spara den sedan
för framtida bruk. Vireserverar oss för ev. text- och bildfel samt ändringar av
tekniska data. Vidtekniska problem eller andra frågor, kontakta vår kundtjänst
(seadressuppgifter på baksidan).
Innehållsförteckning
1. Beskrivning .............................................................22
2. Säkerhetsföreskrifter ..............................................22
2.1 Internationella symboler ...................................................... 23
3. Förpackningen innehåller .......................................24
4. Beskrivning .............................................................24
4.1 Funktioner ............................................................................ 24
4.2 Displaysymboler .................................................................. 26
4.3 Funktionsknapparnas inställningslägen ............................. 27
5. Användning .............................................................27
5.1 Mätning av likspänning (V DC) eller växelspänning (V AC) 27
5.2 Mätning av resistans (Ω) ...................................................... 28
5.3 Diodtest ................................................................................ 29
5.4 Kontinuitetstest (avbrottsmätning) ...................................... 30
5.5 Frekvensmätning.................................................................. 30
5.6 Mätning av dutycycle .......................................................... 31
5.7 Mätning av likström (A DC) eller växelström (A AC) ........... 31
5.8 Automatisk avstängning ...................................................... 32