DT4221
HIOKI DT4221A981-03
DT4222
Instruction Manual
DT4223
DT4224
DIGITAL MULTIMETER
July
2021 Revised edition 3
DT4221A981-03 21-07H
EN
HIOKI DT4221A981-03
Contents
HIOKI DT4221A981-03
Introduction ................................................................... 1
Verifying Package Contents ........................................ 1
Options (sold separately) ............................................ 2
Safety Notes .................................................................. 3
Usage Notes .................................................................. 8
1 Overview 13
1.1 Overview and Features ........................... 13
1.2 Parts Names and Functions ................... 15
1.3 Display ..................................................... 20
1.4 Voltage Input Protected
(DT4223, DT4224) .................................... 21
1.5 Alarm Display and Battery Indicator ..... 22
2 Preparation for Measurements 23
2.1 MeasurementWorkow .......................... 23
2.2 Inserting/Replacing the Battery ............. 24
2.3 Using Test Leads ..................................... 26
2.4 Installation in Measurement Location ... 29
Hanging the instrument with the strap ................29
3 Performing Measurements 31
3.1 Inspection Before Use ............................ 31
3.2 Measuring Voltage................................... 35
Measuring AC voltage .........................................35
Measuring DC voltage ........................................36
Measurement using the AC/DC automatic
judgment (DT4221, DT4223) ..............................36
3.3 Measuring Frequencies .......................... 37
DT4221A981-03
i
Contents
HIOKI DT4221A981-03
3.4 Checking Continuity ............................... 38
3.5 Measuring Diode (DT4222, DT4224) ...... 39
3.6 Measuring Resistance
(DT4222, DT4223, DT4224) ..................... 40
3.7 Measuring Capacitance
(DT4222, DT4224) .................................... 41
3.8 Checking the Electric Charge
(DT4221, DT4223) .................................... 42
4 Using Instrument Conveniently 43
4.1 Selecting the Measurement Range ........ 43
Measuring with the auto range ...........................43
Measuring with the manual range .......................44
4.2 Retaining the Measured Value ............... 45
Retaining the measured value manually
(HOLD) ...............................................................45
Automatically retaining the measured value
when the value stablizes (AUTO HOLD)
(DT4223, DT4224) ..............................................46
4.3 Reducing the Noise (FILTER) ................. 48
4.4 Checking the Relative Value/
Performing Zero Adjustment .................. 50
Checking the relative value (REL) ......................50
Performing zero adjustment ................................51
4.5 Turning On the Backlight ........................ 53
4.6 Using the Auto Power Save (APS) ......... 53
4.7 Power-on Option Table ........................... 54
5 Specications 57
5.1 GeneralSpecications ........................... 57
5.2 Electrical Characteristics ....................... 59
5.3 Accuracy Table ........................................ 61
ii
Contents
HIOKI DT4221A981-03
6 Maintenance and Service 67
6.1 Repair, Inspection, and Cleaning ........... 67
6.2 Troubleshooting ...................................... 68
6.3 Error Display ............................................ 70
Appendix Appx.1
Appx. 1 RMS and Average ....................... Appx.1
iii
Contents
HIOKI DT4221A981-03
iv
Introduction
9243 graber
L4937 マグネットアダプ
タ
L4934 小ワニグチ
DM4910 熱電対
DT4911TestLead
HIOKI DT4221A981-03
Introduction
Thank you for purchasing the Hioki DT4221, DT4222, DT4223,
DT4224 Digital Multimeter. To obtain maximum performance
from the product, please read this manual rst, and keep it
handy for future reference.
Verifying Package Contents
When you receive the instrument, inspect it carefully to ensure
that no damage occurred during shipping. In particular, check
the accessories, panel switches, and connectors. If damage is
evident, or if it fails to operate according to the specications,
contact your authorized Hioki distributor or reseller.
Check the package contents as follows.
Instrument
(The holster has been attached.)
DT4911 Test Lead (p. 26)
LR03 Alkaline battery
DT4221
DT4224
DT4222
DT4223
Instruction Manual
(English)
Instruction manuals may
also be available in other
languages.
Please visit our website at
http://www.hioki.com
1
Options (sold separately)
9243 graber
DM4910 熱電対
DT4911TestLead
9243 graber
L4937 マグネットアダプ
タ
L4934 小ワニグチ
マグネ付ストラップ
L9207-10
DM4910 熱電対
DT4911TestLead
DT4912TestLead
L4930 接続ケーブル
L4931renketu
L4931 延長ケーブル
L4932(+9207-10cap)
L4933 コンタクトピン
L4937 マグネットアダプ
タ
L4934 小ワニグチ
HIOKI DT4221A981-03
Options (sold separately)
The options listed below are available for the instrument. To
order an option, please contact your authorized Hioki distributor
or reseller. Options are subject to change. Please check Hioki’s
website for the latest information.
Connecting cables (p. 26)
L4933
Contact Pin Set
V DC
AC/60
L4934
Small Alligator Clip Set
DT4911
Test Lead
C0200 Carrying Case
The instrument, test leads, instruction manual, and
others can be stored in the case.
V
30
CAT III 300 V/CAT II 600 V
Z5004, Z5020 Magnetic Strap (p. 29)
2
Attach this strap to the instrument and secure it on
the wall surface such as a metal plate for use.
Safety Notes
HIOKI DT4221A981-03
Safety Notes
This instrument is designed to conform to IEC 61010 Safety
Standards, and has been thoroughly tested for safety prior to
shipment. However, using the instrument in a way not described
in this manual may negate the provided safety features.
Before using the instrument, be certain to carefully read the
following safety notes.
DANGER
Mishandling during use could result in injury or
death, as well as damage to the instrument. Be
certain that you understand the instructions and
precautions in the manual before use.
WARNING
With regard to the electricity supply, there are
risks of electric shock, heat generation, re, and
arc discharge due to short circuits. If persons
unfamiliar with electricity measuring instruments
are to use the instrument, another person familiar
with such instruments must supervise operations.
Protective gear
To avoid electric shock when measuring live lines,
wear appropriate protective gear, such as insulated
rubber gloves, boots and a safety helmet.
WARNING
3
Safety Notes
HIOKI DT4221A981-03
Notation
In this manual, the risk seriousness and the hazard levels are
classied as follows.
Indicates an imminently hazardous situation
DANGER
WARNING
CAUTION
IMPORTANT
that will result in death or serious injury to the
operator.
Indicates a potentially hazardous situation
that may result in death or serious injury to the
operator.
Indicates a potentially hazardous situation
that may result in minor or moderate injury to
the operator or damage to the instrument or
malfunction.
Indicates information related to the operation
of the instrument or maintenance tasks with
which the operators must be fully familiar.
Indicates a high voltage hazard.
If a particular safety check is not performed or
the instrument is mishandled, this may give
rise to a hazardous situation; the operator may
receive an electric shock, may get burnt or
may even be fatally injured.
Indicates a strong magnetic-eld hazard.
The effects of the magnetic force can cause
abnormal operation of heart pacemakers and/
or medical electronics.
*
4
Indicates prohibited actions.
Indicates the action which must be performed.
Additional information is presented below.
Safety Notes
・
HIOKI DT4221A981-03
Symbols afxed to the instrument
Indicates cautions and hazards. When the symbol is printed
on the instrument, refer to a corresponding topic in the
Instruction Manual.
Indicates that dangerous voltage may be present at this
terminal.
Indicates a double-insulated device.
Indicates a grounding terminal.
Indicates DC (Direct Current).
Indicates AC (Alternating Current).
Indicates DC (Direct Current) or AC (Alternating Current).
Symbols for various standards
Indicates the Waste Electrical and Electronic Equipment
Directive (WEEE Directive) in EU member states.
Indicates that the instrument conforms to regulations set out
by the EC Directive.
Screen display
This instrument uses the following screen displays.
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
1 2 3 4 5 6 7 8 9 0
5
Safety Notes
HIOKI DT4221A981-03
Accuracy
We dene measurement tolerances in terms of rdg. (reading)
and dgt. (digit) values, with the following meanings:
(Reading or displayed value)
rdg.
The value currently being measured and indicated on the
measuring instrument.
(Resolution)
The smallest displayable unit on a digital measuring
dgt.
instrument, i.e., the input value that causes the digital
display to show a “1” as the least signicant digit.
6
Safety Notes
HIOKI DT4221A981-03
Measurement categories
To ensure safe operation of measuring instruments, IEC 61010
establishes safety standards for various electrical environments,
categorized as CAT II to CAT IV, and called measurement
categories.
DANGER
• Using a measuring instrument in an environment
designated with a higher-numbered category
than that for which the instrument is rated
could result in a severe accident, and must be
carefully avoided.
• Using a measuring instrument without
categories in an environment designated with
the CAT II to CAT IV category could result in a
severe accident, and must be carefully avoided.
This instrument conforms to the safety requirements for CAT III 600 V,
CAT IV 300 V measuring instruments.
CAT II: When directly measuring the electrical outlet receptacles of
the primary electrical circuits in equipment connected to an
AC electrical outlet by a power cord (portable tools, household
appliances, etc.)
CAT III: When measuring the primary electrical circuits of heavy equipment
(xed installations) connected directly to the distribution panel,
and feeders from the distribution panel to outlets
CAT IV: When measuring the circuit from the service drop to the service
entrance, and to the power meter and primary overcurrent
protection device (distribution panel)
Distribution panel
Service entrance
Service drop
CAT IV
Power meter
See: “2.3 Using Test Leads” (p. 26)
Internal wiring
CAT III
Fixed installation
CAT II
T
Outlet
7
Usage Notes
HIOKI DT4221A981-03
Usage Notes
Observe the following precautionary information to ensure
that the instrument can be used safely and in a manner that
allows it to perform as described in its specications. Use of the
instrument should conrm not only to its specications, but also
to the specications of all accessories, options, batteries, and
other equipment in use.
DANGER
If the test lead or the instrument is damaged,
there is a risk of electric shock. Before using the
instrument, perform the following inspection.
• Before using the instrument, check that the
coating of the test leads are neither ripped nor
torn and that no metal parts are exposed. Using
the instrument under such conditions could
result in electrocution. Replace the test leads
with those specied by our company.
• Before using the instrument the rst time, verify
that it operates normally to ensure that no
damage occurred during storage or shipping. If
you nd any damage, contact your authorized
Hioki distributor or reseller.
8
Usage Notes
HIOKI DT4221A981-03
Installation
Installing the instrument in inappropriate locations may cause a
malfunction of instrument or may give rise to an accident. Avoid
the following locations.
CAUTION
• Exposed to direct sunlight or high temperature
• Exposed to corrosive or combustible gases
• Exposed to water, oil, chemicals, or solvents
• Exposed to high humidity or condensation
• Exposed to a strong electromagnetic eld or
electrostatic charge
• Exposed to high quantities of dust particles
• Near induction heating systems (such as highfrequency induction heating systems and IH cooking
equipment)
• Susceptible to vibration
9
Usage Notes
HIOKI DT4221A981-03
Handling the cables
WARNING
To prevent electric shock, when measuring the
voltage of a power line use a test lead that satises
the following criteria:
• Conforms to safety standards IEC61010 or EN61010
• Of measurement category III or IV
• Its rated voltage is higher than the voltage to be
measured
All of the optional test leads for this instrument
conform to the safety standard EN61010. Use a test
lead in accordance with its dened measurement
category and rated voltage.
To avoid electric shock, do not exceed the lower of
the ratings shown on the instrument and test leads.
CAUTION
• Avoid stepping on or pinching the cable, which could
damage the cable insulation.
• To avoid damaging the cables, do not bend or pull the
leads and the probe bases.
The ends of the test leads are sharp. Be careful to avoid
injury.
10
Precautions during measurement
HIOKI DT4221A981-03
WARNING
If the instrument is used in locations where the
rating indicated on the instrument or probes is
exceeded, the instrument may be damaged resulting
in personal injury. Do not use the instrument in such
locations. See “Measurement categories” (p. 7).
CAUTION
• Do not input voltage exceeding the specied
measurement range. Doing so may damage the
instrument.
• During the continuity check, diode test, or measurement
of resistance or capacitance, measurement signals are
generated in the terminals of the instrument. Depending
on the target for measurement, the measurement signal
may cause damage.
Seeing “Measurement current” and “Open circuit
voltage” in the accuracy table (p. 61), check, in
advance, that there are no adverse effects of the
measurement current and the open circuit voltage.
Usage Notes
11
Usage Notes
HIOKI DT4221A981-03
Precautions during shipment
Observe the following during shipment. Hioki cannot be
responsible for damage that occurs during shipment.
CAUTION
• During shipment of the instrument, handle it carefully
so that it is not damaged due to a vibration or shock.
• To avoid damage to the instrument, remove the
accessories and optional equipment from the
instrument before shipment.
If the instrument is not to be used for an extended
period of time
IMPORTANT
To avoid corrosion and/or damage to the instrument due to
battery leakage, remove the battery from the instrument if it is
to be kept in storage for an extended period.
12
Overview
HIOKI DT4221A981-03
1
1.1 Overview and Features
This measuring instrument is a multi-function digital multimeter
that ensures both safety and durability.
Main features and functions
• Speedy display of the RMS measured value
• Environmental performance (can be used anywhere)
(Operation temperature: DT4221, DT4222: −10 to 50°C
• Filter function that controls the inuence of noise
• Hold function that retains the screen display
• Solid body which can be used for an extended period of time (drop-proof)
• Speedy measurement via a fast response*
* Response time of 0 V to 100 V is approx. 0.6 seconds
(until the value falls within the accuracy specication range)
• Voltage input protection function to ensure safe measurement (DT4223,
DT4224)
Protective circuitry to ensure safety in the event of voltage measurement
using the continuity, resistance, capacitance, or diode range (Voltage
Input Protected)
Red backlight to warn user of erroneous voltage input
• Protective circuitry operates in the event of erroneous voltage input to
limit the amount of current owing to the instrument to 1.5 mA or less.
• This safe design keeps circuit breakers from tripping and sparks from
being produced at the tips of test leads.
• Although the DT4221 and DT4222 will not break if they are used to
measure voltage in continuity, resistance, capacitance, or diode range,
those models do not provide functionality to limit the amount of current
owing to the instrument in the event of such measurement to 1.5 mA
or less, or to warn the user of erroneous voltage input by turning the
backlight red.
DT4223, DT4224: −10 to 65°C)
13
Overview and Features
9243 graber
L4937 マグネットアダプ
タ
L4934 小ワニグチ
DM4910 熱電対
DT4911TestLead
9243 graber
L4937 マグネットアダプ
タ
L4934 小ワニグチ
マグネ付ストラップ
L9207-10
DM4910 熱電対
DT4911TestLead
DT4912TestLead
L4930 接続ケーブル
L4931renketu
L4931 延長ケーブル
L4932(+9207-10cap)
L4933 コンタクトピン
L4937 マグネットアダプ
タ
L4934 小ワニグチ
HIOKI DT4221A981-03
Problem nding a suitable
installation location?
The strap with magnet allows
the instrument to be hung
conveniently.
Large, easilyviewable display
Backlighting to allow
users to read the
measurement values in
dark environments
For various
purposes
The measurement
test leads and end
pins can be selected.
14
Parts Names and Functions
HIOKI DT4221A981-03
1.2 Parts Names and Functions
Front
Some indications are different among the models.
Display
(p. 20)
Operation keys
(p. 16 )
Rotary switch
(p. 18)
DT4224
DT4221 DT4222 DT4223
15
Parts Names and Functions
5 6 7 8 9
5 6 7 8 9
HIOKI DT4221A981-03
Operation keys
DT4221, DT4222
11 22
Normal
11
22
33
16
Sets the manual
range/switches
the range.
Manually sets/
cancels the hold
function for the
displayed value.
lights up/
goes off.
Turns on/off the
backlight.
33
Pressed down
for at least 1
second
Cancels the manual
range.
Sets/cancels the
display of the
relative value
(REL).
lights up/goes
off.
Switches/cancels
the low pass lter
and passband
settings.
Poweron option
(p. 54)
All LCDs
light up and
the software
version is
displayed.RANGE:AUTO / RANGE:MANUAL
Cancels the
auto power save
function (APS).
APS goes off.
Turns off the
automatic
backlight
deactivation.
DT4223, DT4224
5 6 7 8 9
5 6 7 8 9
5 6 7 8 9
5 6 7 8 9
HIOKI DT4221A981-03
Parts Names and Functions
Normal
11
22
33
Sets the auto and
manual range/
switches the
range.
RANGE:AUTO / RANGE:MANUAL
Manually sets/
cancels the hold
function for the
displayed value.
lights up.
Turns on/off the
backlight.
11 22
Pressed down
for at least 1
second
Sets/cancels the
display of the
relative value
(REL).
Automatically
sets/cancels the
hold function for
the displayed
value.
Switches/cancels
the low pass lter
and passband
settings.
blinks.
33
Poweron option
(p. 54)
All LCDs light up.
The software
version and
serial number is
displayed.
Cancels the
auto power save
function (APS).
APS goes off.
Turns off the
automatic
backlight
deactivation.
17
Parts Names and Functions
HIOKI DT4221A981-03
Rotary switches and measurement descriptions
44
33
22
11
DT4221
55
22
66
11
DT4222, DT4224
44
33
22
55
55
33
77
88
99
77
11
DT4223
Function
66
DT4221
DT4222
DT4224
DT4223
11
22
33
44
55
66
77
88
99
AC voltage measurement
DC voltage measurement
Frequency measurement
DC/AC voltage measurement
(Automatic judgment)
Continuity check
Electric charge detection
Resistance measurement
Capacitance measurement
Diode test
√ √ √
√ √ √
√ √ √
√ − √
√ √ √
√ − √
− √ √
− √ −
− √ −
18
Rear
HIOKI DT4221A981-03
Parts Names and Functions
DT4224
Test lead holder
The test lead can be held.
11
Measurement terminals
The red test lead is connected.
11
Hereafter referred to as “V terminal”.
The black test lead is connected.
22
Hereafter referred to as “COM terminal”.
22
Strap hole
The optional Z5004, Z5020 Magnetic
Strap can be attached. (p. 29)
Battery cover
When replacing the battery (p. 24),
remove the cover.
Serial number label
The rst four digits of the 9-digit
number indicate the year (the rst
two digits omitted) and the month of
manufacture. Do not remove this label
as the number is important.
(See p. 24)
(See p. 28)
19
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