KYORITSU 3021A User manual

Instruction manual
INSULATION - CONTINUITY TESTER
KEW 3021A・3022A・3023A
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Contents
1．Safety warnings ……………………………………………………１
2．Features ……………………………………………………………４
3．Specification ………………………………………………………５
4．Instrument layout …………………………………………………９
5．Preparation for measurement ……………………………………10
5−1 Test lead connection………………………………………10
5−2 Checks on Test lead and Fuse …………………………10
6．Measurement ……………………………………………………11
6−1 Voltage measurement(Mains disconnection check) …11
6−2 Insulation resistance measurement ……………………11
6−3 Continuous measurement ………………………………14
6−4 Output voltage characteristics……………………………14
6−5 Measurement of resistance (Continuity check) ………15
6−6 Backlight function …………………………………………16
6−7 Auto-power-off ……………………………………………16
7. Functions keys ……………………………………………………17
7−1 Comparator function ………………………………………17
7−2 Memory (save) function …………………………………17
8．Fuse & Battery replacement ……………………………………18
8−1 Battery replacement ………………………………………18
8−2 Fuse replacement …………………………………………19
9．Notes on Housing case and accessories ………………………19
9−1 Case lid ……………………………………………………19
9−2 Neck strap and Cord case ……………………………20
9−3 Test prods and replacement …………………………20
9−4 Adaptors for the Earth cord and replacement …………20
10．Cleaning of the instrument ……………………………………21
11．Servicing …………………………………………………………21
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１．Safety warnings
○ This instrument has been designed, manufactured and tested
according to IEC 61010-1: Safety requirements for Electronic
Measuring apparatus, and delivered in the best condition after passed
the inspection. This instruction manual contains warnings and safety
rules which must be observed by the user to ensure safe operation of
the instrument and retain it in safe condition. Therefore, read through
these operating instructions before using the instrument.
#
WARNING
 Read through and understand instructions contained in this manual
before starting using the instrument.
 Save and keep the manual handy to enable quick reference
whenever necessary.
 The instrument is to be used only in its intended applications.
 Understand and follow all the safety instructions contained in
the
manual.
 Failure to follow the instructions may cause injury, instrument
damage and/or damage to equipment under test. Kyoritsu is by no
means liable for any damage resulting from the instrument in
contradiction to this cautionary note.
○ The symbol
#
indicated on the instrument, means that the user must
refer to the related parts in the manual for safe operation of the
instrument. It is essential to read the instructions wherever the
#
symbol appears in the manual.
#
DANGER ：is reserved for conditions and actions that are likely
to cause serious or fatal injury.
#
WARNING：is reserved for conditions and actions that can cause
serious or fatal injury.
#
CAUTION ：is reserved for conditions and actions that can cause
injury or instrument damage.
#
DANGER
Never make measurement on a circuit in which the electrical
potential exceeds AC/DC600V(Measurement CAT III 600V).
Do not attempt to make measurement in the presence of flammable
gasses. Otherwise, the use of the instrument may cause sparking,
which can lead to an explosion.

Never attempt to use the instrument if it ' s surface or your hand are wet.
 Be careful not to short-circuit the power line with the metal part of the
test leads when measuring a voltage. It may cause personal injury.
 Do not exceed the maximum allowable input of any measuring range.
Never open the Battery cover during a measurement.
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The instrument should be used only in its intended applications or
conditions. Otherwise, safety functions equipped with the instrument
do not work, and instrument damage or serious personal injury may
be caused.
Verify proper operation on a known source before use or taking
action as a result indication of the instrument.
Keep your fingers and hands behind the protective fingerguard
during measurement.
#
WARNING

Never attempt to make any measurement if any abnormal
conditions, such as a broken case or exposed metal parts are
present on the instrument and test leads.

Never press the Test button when connecting the test leads to the
instrument.

Never rotate the Range selector switch with the test leads
connected to the equipment under test.

Do not install substitute parts or make any modification to the
instrument. Return the instrument to your local KYORITSU
distributor for repair or re-calibration in case of suspected faulty
operation.

Never touch the circuit under test during/immediately after the
insulation resistance measurement. The test voltage may cause
electrical shock.

Do not replace batteries if the instrument is wet.

Ensure that the test leads are firmly inserted into the terminal.

Set the Range selector switch to OFF position when opening the
Battery cover for battery replacement.

Stop using the test lead if the outer jacket is damaged and the inner
metal or color jacket is exposed.
#
CAUTION

Always set the Range selector switch to the appropriate position
before making measurement.

Set the Range selector switch to "OFF" position after use and
remove the test leads. The instrument consume small current at
any range other than OFF, and it shortens the battery life.
Remove the batteries if the instrument is to be stored and will not
be in use for a long period.

Do not expose the instrument to direct sunlight, high tempera-
tures, humidity or dew.

Use a damp cloth with neutral detergent for cleaning the
instrument. Do not use abrasives or solvents.

Do not store the instrument if it is wet. Store it after it dries.
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Symbols
Danger of possible electric shock
Instrument with double or reinforced insulation
〜AC
Earth terminal
#Refer to the instructions in the manual to protect the user and
instrument.
This instrument satisfies the marking requirement defined in the
WEEE Directive. This symbol indicates separate collection for
electrical and electronic equipment.
Protection against wrong connection is up to 440V.
○Measurement Category
To ensure safe operation of measuring instruments, IEC 61010
establishes safety standards for various electrical environments,
categorized as O to CAT IV, and called measurement categories.
Higher-numbered categories correspond to electrical environments
with greater momentary energy, so a measuring instrument
designed for CAT III environments can endure greater momentary
energy than one designed for CAT II.
O : Circuits which are not directly connected to the mains
power supply.
CAT II : Electrical circuits of equipment connected to an AC
electrical outlet by a power cord.
CAT III : Primary electrical circuits of the equipment connected
directly to the distribution panel, and feeders from the
distribution panel to outlets.
CAT IV : The circuit from the service drop to the service entrance,
and to the power meter and primary over-current
protection device (distribution panel).
O: Device which is
not directly
connected to the
mains power supply
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２．Features
KEW3021A/3022A/3023A are four-range digital insulation resistance
testers for testing low-voltage installation below 600V.Resistance
measurement with audible Continuity check function is also available.

Designed to following safety standards:
IEC61010-1(CAT III 600V Pollution degree 2)
IEC61010-031 (Requirements for hand-held probes)

Small and light weight.

Auto-discharge function
When insulation resistance like a capacitive load is measured,
electric charges stored in capacitive circuits are automatically
discharged after measuring. Discharge can be checked with the
LED & mark on LCD.

Two resistance ranges: 40Ωand 400Ω(2-range auto) are also
available. Buzzer sounds when a measured current exceeds
200mA.

This instrument has 0ΩADJ. function to null the resistance of test
lead or fuse at resistance measurement.

Measured value is held for about 5 sec. after insulation/ resistance
measurement of the Test button is released.

Backlight function to facilitate work at night or dimly lit locations.

Bar-graph to indicate measured results

Max. 99 data can be saved to the internal memory at the insulation
resistance range.

Visible and audible warning ( or is indicated and buzzer
sounds) when the measured insulation resistance exceeds the pre-
set value.

Live circuit warning indication, LED and buzzer.

The Safety key must be kept pressed down to select 500V or 1000V
range. Otherwise, neither 500V or 1000V range can be selected.

Auto-power off function
To prevent the instrument being left powered on and conserve
battery power, the instrument automatically turns off approx. 15
min. after the last switch operation.

The mark flickers when the battery voltage drops to the lower
limit.

Test leads with remote control switch (voltage won't be outputted
when the test lead is not connected.)

Robust housing case

Neck strap for both hand's operation

User-changeable test prod
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３．Specification

Applicable standards
IEC 61557-1,2,4
IEC 61010-1, -2-030 Masurement CAT III 600V Pollution degree2
(Location for use: altitude 2000m or less, indoor use)
IEC 61010-031
IEC 60529 IP40
EN 61326-1 (EMC)
EN 50581 (RoHS)

Measuring range and accuracy
<Insulation resistance range>
KEW3021A
Nominal voltage 1000V 500V 250V 125V
Auto Range 0〜4/40/400/2000MΩ
0〜4/40/200MΩ
Open circuit
voltage Nominal test voltage 100%~120%
Short circuit
current Within 1.5mA
Nominal test
current 1MΩ0.5MΩ0.25MΩ0.125MΩ
1mA 0%〜＋20%
1st effective
measurement
range 0.200〜
1000MΩ0.200〜 200.0MΩ0.200〜 40.00MΩ0.200〜 20.00MΩ
Center scale
range 50MΩ50MΩ5MΩ5MΩ
Accuracy ±(2%rdg＋6dgt)
2nd effective
measurement
range
0.110〜0.199MΩ
1001〜
2000MΩ200.1〜 2000MΩ40.01〜 2000MΩ20.01〜 200.0MΩ
Accuracy ±(5%rdg＋6dgt)
Accuracy at 0 Within 6dgt
KEW3022A
Nominal voltage 500V 250V 100V 50V
Auto Range 0〜4/40/400/2000MΩ0〜4/40/200MΩ
Open circuit
voltage Nominal test voltage 100%~120%
Short circuit
current Within 1.5mA
Nominal test
current 0.5MΩ0.25MΩ0.1MΩ0.05MΩ
1mA 0%〜＋20%
1st effective
measurement
range 0.200〜
200.0MΩ0.200〜 40.00MΩ0.200〜 20.00MΩ0.200〜 20.00MΩ
Center scale
range 50MΩ5MΩ5MΩ5MΩ
Accuracy ±(2%rdg＋6dgt)
2nd effective
measurement
range
0.110〜0.199MΩ
200.1〜
2000MΩ40.01〜 2000MΩ20.01〜 200.0MΩ20.01〜 200.0MΩ
Accuracy ±(5%rdg＋6dgt)
Accuracy at 0 Within 6dgt
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<Operating uncertainty>
Operating uncertainty (B) is an error obtained under the nominal
operating conditions, and calculated with the intrinsic error (A),
which is an error of the instrument used, and the error (En) due to
variations. According to IEC61557, the maximum operating error
should be within +/-30%.
Ｂ ＝︱Ａ︱＋ 1.15 ×√ （Ｅ12＋Ｅ22＋Ｅ32）
Ａ ：Intrinsic error（％）
Ｂ ：Operating uncertainty（％）
Ｅ1：Variation due to changing the position（％）
Ｅ2：Variation due to changing the Supply voltage（％）
Ｅ3：Variation due to changing the temperature（％）
Nominal operating conditions
Ambient temperature : 0〜40℃
Relative humidity : 90% or less
Position : Horizontal〜±90゜
Battery voltage : within the battery effective range
KEW3023A
Nominal voltage 1000V 500V 250V 100V
Auto Range 0〜4/40/400/2000MΩ
0〜4/40/200MΩ
Open circuit
voltage Nominal test voltage 100%~120%
Short circuit
current Within 1.5mA
Nominal test
current 1MΩ0.5MΩ0.25MΩ0.1MΩ
1mA 0%〜＋20%
1st effective
measurement
range 0.200〜
1000MΩ0.200〜 200.0MΩ0.200〜 40.00MΩ0.200〜 20.00MΩ
Center scale
range 50MΩ50MΩ5MΩ5MΩ
Accuracy ±(2%rdg＋6dgt)
2nd effective
measurement
range
0.110〜0.199MΩ
1001〜
2000MΩ200.1〜 2000MΩ40.01〜 2000MΩ20.01〜 200.0MΩ
Accuracy ±(5%rdg＋6dgt)
Accuracy at 0 Within 6dgt
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<Resistance range>
Auto-range 0〜40.00/ 400.0Ω
Open-circuit voltage(DC) 5V±20%
Short-circuit current DC200mA or more
Measuring range to keep
operating error/ tolerance 0.2〜400Ω/ ±(2%rdg + 8dgt)
Outside of the measuring range to
keep operating error/ tolerance 0〜0.19/Ω0.1Ω
<Voltage range>
Measured voltage 20 〜600V
Accuracy ±(3%rdg+6dgt)
Accuracy at 0 Within 6dgt
<Number of measurement >
Possible number of measurement within the "BATTERY.GOOD" range.
(Measure 5 sec., and take pause for 25 sec.)
Range Resistor for test Possible number of
measurement
50V 0.05MΩat least 1300 times
100V 0.
1 MΩat least 1300 times
125V 0.
125 MΩat least 1200 times
250V 0.
25 MΩat least 1000 times
500V 0.
5 MΩat least 1000 times
1000V
1 MΩat least 400 times
Continuity
1 Ωat least 1300 times
Temperature & : 0℃〜 40℃(RH: 90% or less)
humidity range (no condensation)
Storage temperature : -20℃〜 60℃(RH: 75% or less)
& humidity range (no condensation)
Location for use : Altitude 2000m or less, Indoor use
Response time : Indicated value at each insulation resistance
range comes within accuracy within approx. 1
sec. after a resistance corresponding to the
mid-value and 0
Ω is suddenly applied across
the measuring terminals. (It may take
time
when measuring a capacitive load.)
Withstand voltage : AC5,160V(50/60Hz) for 5s. between the
electrical circuit and the enclosure．
Overload protection : The instrument operates properly after each of
the voltage shown in the table below is
applied.
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MODEL KEW3021A / 3023A KEW3022A
Continuity range AC 440V / 1min. AC 440V / 1min.
Insulation
resistance All ranges:AC1200V / 10sec. All ranges :
AC600V / 10sec.
AC voltage AC720V / 10sec. AC720V / 10sec.
Auto-ranging:
Range shifts to upper range: when a reading go over 4200
Range shifts to lower range : when a reading go to less than 320
Dimension : approx. 105(L)×158(W)×70(D)mm
Weight : approx. 600g (including batteries)
Power source : R6P or LR6 sizeAA x 6pcs
Nominal power : 2.7VA
Accessories
MODEL7103ATest lead with remote control switch 1 set
MODEL7161A test bar 1 pce
MODEL7131B Safety alligator clip 1 pce
MODEL8017 Extension prod 1 pce
Neck strap 1 pce
Cord case 1 pce
R6P (SUM-3), sizeAA 6 pcs
Instruction manual 1 pce
Optional
MODEL7115 Extension probe
MODEL8016 Pickle type prod
When the instrument and the test lead are combined and used together,
whichever lower category either of them belongs to will be applied.
Pickle type prod
Extension probe Fig. 1
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