Clas Ohlson ut61d User manual

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USB Multimeter
Multimeter medUSB
Multimeter medUSB
Yleismittari, jossaUSB
Multimeter mit USB
Art.no Model
36-4717 UT61D
English 3
Svenska 28
Norsk 53
Suomeksi 78
Deutsch 103
Ver. 20140523

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English
USB Multimeter
Art.no 36-4717 Model UT61D
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...........................................................5
2. Safetyinstructions...............................................5
3. Package contents................................................6
4. Functions .............................................................7
4.1 Display symbols....................................................................... 8
5. Operation .............................................................9
5.1 Voltage measurement .............................................................. 9
5.2 DC and AC Current measurement......................................... 12
5.3 Resistance measurement...................................................... 13
5.4 Continuity testing................................................................... 14
5.5 Diode testing.......................................................................... 15
5.6 Capacitance measurement ................................................... 16
5.7 Frequency measurement....................................................... 17
5.8 Holdmode.............................................................................. 17
5.9 Backlight ................................................................................ 17
5.10 Relative measurement ......................................................... 18
5.11 Sleep mode (automatic shut-off)......................................... 18

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6. Installing thesoftware .......................................18
6.1 Installation.............................................................................. 18
6.2 Operation................................................................................ 19
6.3 Screen .................................................................................... 21
7. Changing thebattery.........................................22
8. Fuses.................................................................. 23
8.1 Checking thefuses ................................................................ 23
8.2 Changing thefuses................................................................ 23
9. General specifications.......................................24
9.1 Accuracy ................................................................................ 24
10.Electrical specifications ................................... 25
10.1 AC Voltage............................................................................ 25
10.2 DC Voltage............................................................................ 25
10.3 DC Current............................................................................ 25
10.4 AC Current............................................................................ 26
10.5 Resistance............................................................................ 26
10.6 Capacitance ......................................................................... 26
10.7 Frequency............................................................................. 27
10.8 DiodeTest............................................................................. 27
10.9 Continuity Test ..................................................................... 27

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1. Description
• Advanced TRUE-RMS multimeter with USB and RS232 connectors that let you
save and analyse your readings in your computer.
• Measuring functions: AC, DC, capacitance and frequency measurements,
diodetest and buzzer.
• Automatic shut-off.
• Optical interface for PC connection.
• Rugged, rubber-clad shock-absorbent case.
• Comes with test leads, 9 V battery, USB cable, serial cable and PC software.
• Size: 180×87×47 mm.
2. 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) III 1000 V, IV 600 V contamination level 3 in accordance with
EN 61010–1:2010 and EN61010-031:2002/A1:2008.
• This meter is designed for indoor use at working temperatures in therange
of0–40°C.
• Make sure that themeter is used safely by following thesafety instructions and
operating directions written in this instruction 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.
Evenlow voltages can be dangerous!
• Do not measure voltages higher than 600 VDC or 600 VAC RMS between apower
point and earth connection.
• To avoid shocks you need to be CAREFUL when you work with voltage higher
then 60 VDC or 30 VAC 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overload
limits. Theguarantee is void 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.
3. Package contents
• Multimeter (with battery)
• 2 x testleads
• USBcable
• RS232C cable
• UT61 multi-purpose socket
• Instruction manual
• CD-ROM software disc
• Case

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10
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4. Functions
1. LCD display
2. [Max Min]
– Pressto switch between max and min measured value.
– Holdin for two seconds to return to normal display.
3. [Range]
– Pressonce to enter manual settings mode; thebuzzer sounds once.
– Pressrepeatedly to advance through themeasuring ranges; thebuzzer sounds.
– Holdin for two seconds to return to Autorange (automatic measuring
rangesetup).
4. [Hold/Light]
– Pressto save areading (data hold function), press once more to delete
thereading.
– Holdin for two seconds to turn on thedisplay backlight for 10 seconds.
5. Multifunction selector
8 different measuring functions and off switch.
6. Testlead sockets
7. Testlead sockets

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8. [REL ▲/RS 232 (USB)]
– Pressonce to enter RELmode.
– Pressonce to exit RELmode.
– Holdin for two seconds to activate or deactivate theRS232/USB function.
Thesleep function is exited when theRS232/USB function is activated and
disappears from thedisplay.
9. [Hz %]
– Pressto measure frequency.
– Pressto select Duty Cyclevalue.
10. Alternative functions (blue button)
Press to select alternative functions for thesettings modes in blue.
11. Testlead sockets
12. Testlead sockets
4.1 Display symbols
Thedata hold function is activated.
Thesleep mode is activated.
Indicates anegative reading.
Indicator for AC measurement.
Indicator for DC measurement.
TheAutorange is activated (meter automatically selects therange with
bestresolution).
Indicator for manual range mode (not on this model).
Thereading is too high for this measuring range.
Indicator for thediodetest.
Thecontinuity buzzer is activated.
Maximum and minimum reading.
Dataoutput in progress (USB/RS232).
Lowbattery warning – replace thebattery.
REL is activated, thestored value minus thepresent value is displayed.
Resistance, Ω Ohm, kΩ (kiloohm), MΩ (megaohm).
Voltage, mV (millivolt), V (volt).
Amperes, μA (microampere), mA (milliampere), A (ampere).
Capacitance; nF (nanofarad), μF (microfarad), mF (millifarad).
Frequency, Hz (hertz), kHz (kilohertz), MHz (megahertz).

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5. Operation
Warning!
• When measuring voltage always ensure that themeter is switched to
thecorrect function range and not set to thecurrent, resistance or diode test
range. 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objects being measured have high power outputs.
• Make sure that theobject 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 is selected. Ifin doubt about
thecorrect range, start with thehighest and work downwards.
• Be extremely cautious when using this meter on aninductive component such
as atransformer, relay coils and thelike. Highvoltage may be produced at
theterminals if anopen circuit occurs.
• Make sure that thetest leads are in good condition with no damage to theinsulation.
• Take care not to exceed theoverload limits given in thespecifications.
• If you replace thefuse, make sure that it is thecorrect type and rating.
5.1 Voltage measurement
5.1.1 Measuring DC voltage
1. Connect theblack test lead
to and thered test
lead to .
2. Setthefunction selector
to for DC voltage
measurement.
3. Themeter is set by default
to Autorange (automatic
range setup). Ifyou wish
to change therange
manually, press [Range]
severaltimes.
4. Connect thetest leads
across thesource or load to
be measured.

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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).
5.1.2 Measuring AC voltage
1. Connect theblack test lead
to and thered test
lead to .
2. Setthefunction selector
to for AC voltage
measurement.
3. Themeter is set by default
to Autorange (automatic
range setup). Ifyou wish to
change therange manually,
press [Range] several times.
4. Connect thetest leads
across thesource or load to
be measured.
5. Thetrue RMS value will be
displayed.
6. Press[Hz %] to obtain
thefrequency and Duty
Cyclevalue.
Input amplitude:
≥ range×30 %
Frequency response: ≤ 1kHz
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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5.1.3 AC/DC voltage measurement inmV
1. Connect theblack test lead
to and thered test
lead to .
2. Setthefunction selector to
for voltage measure-
ment inmV.
3. Themeter is set by default
to Autorange (automatic
range setup). Ifyou wish to
change therange manually,
press [Range] several times.
4. Themeter is preset to
measure DC, change to AC
using theblue button (10).
5. Connect thetest leads
across thesource or load to
be measured.
6. Thetrue RMS value will be
displayed.
7. Press[Hz %] to obtain
thefrequency and Duty
Cyclevalue.
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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5.2 DC and AC Current measurement
1. Connect theblack test
lead to and thered
test lead to
(for 0–600mA) or to
(for therange
600mA– 10A).
2. Setthefunction selector to
, or .
3. Themeter is preset to
measure DC, change to AC
using theblue button (10).
4. Connect thetest leads in
series with thecurrent source
to be measured.
5. When measuring current
between 600 mA and
10A (without fuse) follow
themethod above but
connect thered test lead to
instead.
6. Thetrue RMS value will be
displayed.
7. Press[Hz %] to obtain
thefrequency and Duty
Cyclevalue.
Input amplitude:
≥ range×30 %
Frequency response: ≤ 1kHz
Warning:
• 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meter
from overheating.
• The interval between two readings must be greater than 15 seconds.

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5.3 Resistance measurement
1. Connect theblack test lead
to and thered test
lead to or use
themulti-purpose socket*
(if you are measuring loose
components).
2. Setthefunction selector
to theresistance
measurement .
3. Connect thetest leads
across thecircuit to
betested.
*The multi-purpose socket should be connected to and .
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).
Note:
• The test leads can add 0.2–0.5 Ω of error to theactual resistance measured.
Toobtain accurate readings of low-resistance components, press
[REL ▲/RS 232 (USB)] and short-circuit theinput sockets beforehand,
toremovethelead resistance error from thereading on thedisplay.
• If theΩ reading with shorted test leads is ≤ 0.5 Ω, check that none of thetest
leads or connections isloose.
• For high-resistance measurement (>1 MΩ) it is normal that it takes several seconds
for thereading to stabilize. Usetest leads which are as short as possible or use
themulti-purpose socket to carry out themeasurement.
• If appears on thedisplay, thetested resistance is either open-circuit or higher
than themaximum range of themeter.

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5.4 Continuity testing
1. Connect theblack test lead
to and thered test
lead to .
2. Setthefunction selector to
for continuity testing.
3. Presstheblue button (10) to
select measurement mode.
4. Connect theends of
thetest leads to theends of
thecables to be tested.
– The buzzer sounds
continuously if
theresistance is <10Ω.
– The buzzer does not
sound if theresistance
is >35Ω.
Warning:
• Make sure that thecircuit to be tested is not conducting any current before testing
for continuity.
• Be extremely cautious when using this meter on aninductive component such
as atransformer, relay coils and thelike, make sure they have been discharged
beforehand. Highvoltage may be produced at theterminals if anopen
circuitoccurs.
• 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.
Note: Theopen-circuit voltage is around 0.45V.

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5.5 Diode testing
1. Connect theblack test
lead to and thered
test lead to .
2. Setthefunction selector
to for diode threshold
value (V) testing.
3. Presstheblue button (10)
to select measurement
mode.
4. 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.
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 produced at theterminals 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 alot depending on theresistance of other
paths of conductance between thetips of thetestleads.

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5.6 Capacitance measurement
1. Connect theblack test lead
to and thered test
lead to or use
themulti-purpose socket*
(if you are measuring loose
components).
2. Setthefunction selector
to for measuring
capacitance.
3. Presstheblue button(10)
toselect thenF
measurement mode.
4. The meter will show afixed value (approx 10 nF) before measuring has begun.
Thisis theinternal capacitance of themeter. Toobtain accurate readings of
low-capitance components, press [REL ▲/RS 232 (USB)] to remove theinternal
capacitance error from thereading on thedisplay.
5. Thereare two methods of measurement:
The multi-purpose socket can be used for
measuring normal capacitors or surface-
mounted capacitors. Connect thecapacitor
to therespective positive and negative jack of
themulti-purpose socket. Thismethod is better
for measuring small capacitances.
Or use this method:
Connect thetest leads across theobject
beingmeasured.
Note:
It will take longer for thereading to stabilize if thecapacitance is over 100μF.
will appear on thedisplay if thecapacitor is shorted or if it has avalue exceeding
themaximum range.
*The multi-purpose socket should be connected to and .

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5.7 Frequency measurement
1. Connect theblack test lead
to and thered test
lead to .
2. Setthefunction selector to
. Frequency is preset
by default, otherwise press
[Hz %] to select .
3. Connect thetest leads to
thecircuit to be tested and
read thevalue.
4. Ifyou wish to measure
theDuty Cycle value, press
[Hz %] and select .
Warning:
To avoid personal injury, do not attempt to input voltage higher than 30 VRMS.
Note:
Input amplitude (DC electrical level is zero):
At 10 Hz – 10 MHz: 200 mV ≤ a≤ 30 VRMS.
5.8 Holdmode
1. Pressthe[Hold/Light] to save thepresent reading.
2. Thebuzzer sounds once and appears on thedisplay when Hold is activated.
3. Thereading is deleted if you press thebutton onceagain.
Note:
The hold function cannot save readings which are unstable ornoisy.
5.9 Backlight
Hold in [Hold/Light] for two seconds to turn on thebacklight. Thelight will turn off
automatically after 10 seconds.

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5.10 Relative measurement
Press [REL ▲/RS 232 (USB)] to subtract aprevious reading from thepresent reading
and display therelative value (difference) on thedisplay. 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.
5.11 Sleep mode (automatic shut-off)
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 meter can be turned on again by pressing any of thebuttons or turning
thefunction selector.
• Deactivate thesleep mode function by pressing theblue button whilst turning
themeteron.
6. Installing thesoftware
The software required for interfacing with acomputer is supplied.
6.1 Installation
1. Insertthesupplied CD into your computer’s CDdrive.
2. Openthedisc using Explorer (or equivalent) and click on
UT61B_C_D_V 3.01_ Setup-exe.
3. Clickon Next to start
theinstallation.

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4. Clickon Next in thefollowing
dialogue boxes.
5. Clickon Finish to end
theinstallation.
6.2 Operation
Connecting themeter to acomputer and using thesoftware program:
1. Remove thecover of theoptical interface on theback of themeter (by sliding it
upwards) and connect one of thesupplied cables (RS232 or USB) to theoptical
interface and to thecorresponding computer port.
2. Hold in [REL ▲/RS232 (USB)] for two seconds to activate or deactivate
theRS232/USB function.
3. The sleep function is exited when theRS232/USB function is activated and
disappears from thedisplay.
4. If themeter is in theHold, Max/Min or REL mode, therespective type
of reading will appear on thedisplay but aneutral reading will be sent via
thecomputerinterface.

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Starting theprogram:
1. Clickon Start > All Programs > DMM > UT61B_C_D > UT61B_C_D V3.xx
tostart theprogram.
2. Setthefunction selector to thedesired measuring range position.
3. Holdin [REL ▲/RS 232 (USB)] for afew seconds until appears in thetop left
corner of thedisplay.
4. Clickon COM connection or USB connection depending on which cable you
have connected to thecomputer.
5. Takeareading.
6. Clickon Connect and then Start to start saving thereadings. Clickon Stop to
stop saving readings.