DISTRIBUTOR

Instruction manual

Kyoritsu reserves the rights to change specifications or designs described in thismanual without notice and without obligations.

Multifunction Tester

KEW 6514BT
02-24
02-24

92-2453
92-2453

Contents
1. Safety warnings ........................................................................................................... 1
2. Features ...................................................................................................................... 4
3. Specifications .............................................................................................................. 6
3.1 Measuring range and accuracy ............................................................................. 6
3.2 Possible number of measurements within the effective battery voltage .............. 10
3.3 Others .................................................................................................................. 10
3.4 Operating uncertainty .......................................................................................... 11
4. Instrument layout ....................................................................................................... 14
5. Accessories ............................................................................................................... 16
6. Setup ......................................................................................................................... 20
7. Getting started ........................................................................................................... 21
7.1 Attachment of metal tip/ adapter to test leads ..................................................... 21
7.2 Battery voltage check .......................................................................................... 22
7.3 Time adjustment .................................................................................................. 22
7.4 Help function........................................................................................................ 22
8. Insulation resistance .................................................................................................. 23
8.1 Measurement method.......................................................................................... 23
8.2 Continuous measurement ................................................................................... 25
8.3 Voltage characteristics of measurement terminals .............................................. 25
8.4 DAR/ PI measurement, 1-min value display ........................................................ 26
8.5 Comparator function ............................................................................................ 26
8.6 SPD ..................................................................................................................... 27
8.7 Safety lock function ............................................................................................. 27
9. Voltage....................................................................................................................... 28
10. Continuity................................................................................................................. 29
10.1 0 Ω ADJ. function .............................................................................................. 29
10.2 Measurement method........................................................................................ 29
10.3 Comparator function .......................................................................................... 31
11. Earth resistance ....................................................................................................... 32
11.1 Measurement principle ...................................................................................... 32
11.2 3W (Precision measurement) and 2W (Simplified measurement) method ........ 33
11.3 Loop 2W measurement method (2-Wire loop impedance test) ......................... 36
11.4 Comparator function .......................................................................................... 37

12. Phase rotation ......................................................................................................... 38
13. RCD ......................................................................................................................... 40
13.1 Measurement principle .................................................................................... 40
13.2 Measurement method...................................................................................... 40
13.3 Auto test........................................................................................................... 44
14. EV charger (EVSE function) .................................................................................... 45
14.1 CP signal (CP) ................................................................................................. 46
14.2 Latch locking test ............................................................................................. 47
14.3 EVSE programmable autotest ......................................................................... 49
15. Memory function ...................................................................................................... 50
15.1 Manual data save ............................................................................................ 50
15.2 Auto memory function ...................................................................................... 51
15.3 How to recall save data ................................................................................... 52
15.4 How to delete data........................................................................................... 52
16. How to transfer the save data.................................................................................. 54
17. Bluetooth communication function........................................................................... 55
17.1 Bluetooth communication ................................................................................ 55
17.2 Feature of KEW Smart Advanced.................................................................... 56
18. Battery and fuse replacement.................................................................................. 57
18.1 Battery replacement ........................................................................................ 57
18.2 Fuse replacement ............................................................................................ 57
19. Strap belt assembly ................................................................................................. 59

1. Safety warnings
This instrument has been designed, manufactured, and tested according to IEC 610101: Safety requirements for Electronic Measuring apparatus, and delivered in the best
condition after passing quality control tests.
This instruction manual contains warnings and safety procedures which have to beobserved by the user to ensure safe operation of the instrument and to maintain it insafe condition. Therefore, read through these operating instructions before starting to
use the instrument.
# DANGER• Read through and understand the instructions contained in this manual before using
the instrument.
• Keep the manual at hand 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.
It is essential that the above instructions are adhered to.
Failure to follow the above instructions may cause injury, instrument damage and/or
damage to equipment under test. Kyoritsu assumes no responsibility for damage andinjury caused by misuse or not following the instructions in the manual.
The symbol # indicated on the instrument, means that the user must refer to the relatedparts in the manual for safe operation of the instrument. It is essential to read the
instructions wherever the # symbol appears in the manual.
# DANGER:# WARNING:# CAUTION:

is reserved for conditions and actions that are likely to cause serious
or fatal injury.
is reserved for conditions and actions that can cause serious or fatal
injury.
is reserved for conditions and actions that can cause injury or
instrument damage.

# DANGER• Do not apply voltages above 600 V, including voltage to earth, across the terminals of
this instrument.
• This instrument is rated to CAT III 600 V/ CAT IV 300 V. Do not make measurements
under the circumstances exceeding the designed measurement categories (such as
CAT IV 600 V).
• Do not attempt to make measurements 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 its surface or your hand is wet.
• Be careful not to short-circuit a power line with the metal part of the test lead during ameasurement. It may cause personal injury.
• Never open the battery compartment cover during a measurement.
• Keep your hand and fingers behind the protective fingerguard during a measurement.
• Verify proper operation on a known source before use or take actions as a result of
the indication of the instrument.

1

# WARNING• Do not use the instrument or test leads if any abnormal conditions, such as broken
cover or exposed metal parts are noted.
• First, firmly connect the test leads to the instrument, and then press the test switch.
• Never install substitute parts or make any modifications to the instrument. Send the
instrument to your local KYORITSU distributor for repair or re-calibration.
• Do not try to replace batteries if the surface of the instrument is wet.
• Connect each test lead firmly into the corresponding terminals.
• Before opening the battery compartment cover for battery or fuse replacement,
ensure that no test leads are connected to the instrument and the instrument is off.
• Stop using the test lead if the outer jacket is damaged and the inner metal or color
jacket is exposed.
• Never turn the rotary switch while the test leads are connected to the equipment
under test.
# CAUTION• Power off the instrument and disconnect all test leads after use. Remove batteries if
the instrument is to be stored and won't be used for a long period.
• Do not expose the instrument to direct sunlight, high temperature, humidity, or dew.
• Use a slightly damp cloth with neutral detergent or water for cleaning. Do not use
abrasives or solvents.
• If the instrument is wet, make sure to let it dry before putting it into storage.
• This instrument isn't waterproof. Do not let the instrument get wet. Otherwise, it may
cause malfunction.
• Always make sure to set the rotary switch to the appropriate position before making ameasurement.
• Do not apply voltage to the instrument while it is powered off.
Symbols
The following symbols are used and marked on the instrument and in this instruction
manual. Please carefully check before starting to use the instrument.






Double or reinforced insulation
User must refer to the explanations in the instruction manual.
Earth
Danger of possible electrical shock
Do not use on AC electric systems exceeding 600 V.
Complies with WEEE Directive (2002/ 96/ EC) marking requirements. (valid
in each EU country)2Measurement (overvoltage) category
To ensure safe operation of measuring instruments, IEC 61010 establishes safety
standards for various electrical environments, categorized as O to CAT IV, and calledmeasurement categories. Higher- numbered categories correspond to electricalenvironments 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
CAT II: Measuring circuits without a MEASUREMENT CATEGORY: Electrical circuits of equipment connected to an AC electrical outlet by apower 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 overcurrent protection device (distribution panel).

O: Measuring circuits
without a
MEASUREMENTCATEGORY3

2. Features
KEW 6514BT is a versatile multifunction tester offering the following electricalmeasurements.
1．Insulation resistance measurement
2．Voltage measurement
3．Continuity measurement
4．Earth resistance measurement
5．Phase rotation check
6．RCD test (measures RCD trip time and Ramp)
7．EVSE (EV charger) test
• Each function has the following features.
Insulation resistance measurement
Auto discharge

Electric charges stored in capacitive loads during measurement
are automatically discharged after the measurement.

Elapsed time display

Elapsed time of measurement is displayed when starting
insulation resistance measurement. The LCD shows 1-minvalue as well.

DAR (Dielectric Absorption Ratio) value and PI (Polarization
DAR/PI measurement Index) values are automatically calculated and displayed
during insulation resistance measurement.
SPD

Operating voltage of SPD (Surge Protection Device) can bemeasured.

Safety lock

Stops voltage output to prevent a risk of danger: unintentional
measurement by pressing the test switch by mistake won't be
performed.

Continuity measurement
Protection against
live circuit

The internal circuit is protected against electrical hazards
even if the instrument is connected to the live circuit duringresistance or continuity measurement by mistake.

0Ω adjustment

It is possible to cancel the resistance of test leads andmeasure the resistance of the measured object only.

Earth resistance measurement
Precision/ Simplified Both of precision measurement (using 3-wire) and simplified
measurement
measurement (using 2-wire) are available.
Impedance between LINE-EARTH can be measured even if the
LOOP 2-Wirecircuit under test is live.
Phase rotation check
Supporting low
voltagePhase rotation check can be started from the low voltage dueto the wide measurement range: 3 V - 600 V.

Motor rotation

Phase rotation check for the wiring of motor is possible bymeasuring voltage generated at operating the motor manually.

4

RCD test
Auto test

×1/2, ×1, and Ramp test are automatically performed in sequence.

EV charger check
CP signal
measurement

Max charging current and CP STATE (connection state
between EV charger and EV) are displayed by measuring CP
signal (communication signal between EV charger and EV).

Latch locking test

Measures the resistance of built-in monitoring resistor forchecking the latch switch of the charging cable for EV charger
is locked or unlocked state.

EVSE programmable
autotest

It is possible to select and arrange the test items and sequence
freely by using our special application and perform tests in the
programmed sequence.

• Comparator function
The LCD shows whether the values measured at insulation resistance, continuity, or
earth resistance are within or out of the allowable range.
• Memory function
Measured data can be saved in the internal memory and recalled and deleted from thememory.
• Auto memory function
Measured data is automatically saved in the internal memory after measurement.
(As for the functions on which measurement is being performed continuously, e.g.,
voltage function, a press of test button is required to save the data.)• Bluetooth communication function
Remote monitoring and data transfer are possible by pairing with tablet devices via
Bluetooth. Data in the internal memory can be transferred to a PC via Bluetooth.
• IR communication function
Data in the internal memory can be transferred to a PC via IR communication by using
USB adapter MODEL 8212USB (optional accessory).
• Clock function
Measured date and time are saved together with the measured results.
• Auto power off
The instrument turns off automatically when the instrument is inactive for about 10
minutes.
• Help function
Correct wiring for each measurement can be checked on the LCD.

5

3. Specifications
3.1 Measuring range and accuracy(23℃±5℃ , 45%-75%RH)(1) Insulation resistance measurement
Rated measurement
voltage
Range(Auto-ranging)

25V

50V

2/20 MΩ

100V

125V

250V

2/20/200 MΩ

500V

1000V

2/20/200/1000 MΩ

2/20/200/2000 MΩ

2 MΩ: 0.000-2.099 MΩ
20 MΩ:1.60-20.00 MΩ
20 MΩ: 1.60-20.99 MΩ
Display range
200 MΩ: 16.0-200.0 MΩ
200 MΩ: 16.0-209.9 MΩ
1000
MΩ: 1602000 MΩ: 1601000 MΩ
2000 MΩOver-range>20.00 MΩ
>200.0 MΩ
>1000 MΩ
>2000 MΩ
display
Open circuit
100-120% of the rated measurement voltage
voltage
Short circuit
Within 1.5 mAcurrent
1.0-1.2 mA (at the following resistances)
Rated
measurement 0.025
0.05
0.1
0.125
0.25
0.5 MΩ
1 MΩ
current
MΩ
MΩ
MΩ
MΩ
MΩ
0.100First effective 0.100-10.00 MΩ 0.100-25.0 MΩ
0.100-1000 MΩ
50.0 MΩ 0.100-100.0 MΩ
measurement
range±2%rdg±2dgt
0.050-0.099 MΩ: ±2%rdg±4dgt
Secondeffective
10.01-18.00 MΩ 25.1-180.0 MΩ 50.1-180.0 100.1-900 MΩ
1001-1800 MΩ
MΩmeasurement
range±5%rdg0.000-0.049
MΩ: ±2%rdg±6dgt
Other180.1-200.0 MΩ
901-1000 MΩ
1801-2000 MΩ
measurement 18.01-20.00 MΩ
range±5%rdg• Positive measurement voltage is outputted from the PE terminal and negative voltage
from the L terminal.
• Max capacitive load: The maximum value of capacitive load which can be discharged
within the defined time (10 sec.) after measuring 1 uF (IEC 61010-2-034).
• Inductive load: 2 uF, capacitive load of which variations at the output voltage test
defined in IEC 61557-2 are within ±10%.
• Buzzer sounds during a measurement on 1000 V range.
(2) SPD
Range
Display range and measuring range
Over-range indication
Accuracy
Voltage increase ratio
Voltage increase stepThreshold value for current detection

61000 V
0-1000 V>1000V±5%rdg±5dgt
100 V/ sec.
By 1 V
1 mA

(3) Voltage
Range (Auto-ranging)

300.0/ 600 V
Voltage: 2.0-314.9 V, 240-600 V
Frequency: 40.0-70.0 Hz (2 V or higher)
Voltage: 2-600 V
Frequency: 45-65 Hz
Voltage: <2.0 V, >600 V
Frequency: <40.0 Hz, >70.0 Hz
Voltage: ±2%rdg±4dgt
Frequency: ±0.5%rdg±2dgt

Display range
Measuring range(guaranteed accuracy)
Over-range indication
Accuracy* Measurement method: RMS detection
Add ±1%rdg to the specified accuracy for the sine wave other than CF <2.5.
(850 Vpeak or less)(4) Continuity
Range (Auto-ranging)

20.00/ 200.0/ 2000 Ω
20.00Ω:0.00-20.99 Ω
200.0Ω:16.0-209.9 Ω
2000Ω:160-2000 Ω

Display range

Measuring range
0-2000 Ω(guaranteed accuracy)
Over-range indication>2000 ΩAccuracy (NULL enabled)±2.0%rdg±8dgt
Open circuit voltage
7-14 V DC
Measurement current
200 mA or more (2 Ω or less)* 0 Ω adjustment function is available when the displayed value is 9 Ω or less.
(5) Earth resistance measurement
1. 3W (Precision measurement) and 2W (Simplified measurement) tests
3W (Precision measurement) 2W (Simplified measurement)
Range (Auto-ranging)
20.00/ 200.0/ 2000 Ω
20.00 Ω: 0.00-20.99 Ω
Display range
200.0 Ω: 16.0-209.9 Ω2000 Ω: 160-2000 Ω
Measuring range
0-2000 Ω(guaranteed accuracy)
Over-range indication>2000 Ω20Ω range：±2%rdg±0.08 Ω 20Ω range：±2%rdg±0.08Ω
Other ranges：±2%rdg±3dgt
Accuracy(Aux. earth resistance：100 Ω) Other ranges：±2%rdg±3dgt
Output current

20Ω range: Approx. 3 mA
200Ω range: Approx. 1.7 mA
2000Ω range: Approx. 0.7 mA
Frequency: 825 Hz±5 Hz

7

(6) Loop 2W (2-Wire loop impedance test)
85-260 V (50/ 60 Hz)(Frequency display range: 45-65 Hz)
200.0/ 2000 Ω
200.0Ω: 0.0-209.9 Ω
2000Ω: 210-2000 Ω

Input voltage range
Range (Auto-ranging)
Display range
Measuring range(guaranteed accuracy)
Over-range indication
Accuracy
Measurement current

0-2000 Ω>2000 Ω±(3%rdg+10dgt)
L-PE: 7 mA

* If a reading is unstable, one upper range digit might be used instead of the display
range to be used.
(7) Phase rotation
Phase rotation
Display range

2 V-600 V/45-65 Hz

Measuring range

3 V-600 V/ 45-65 Hz(guaranteed accuracy)

Indication

Motor rotation
No voltage indication.
*The LCD shows“>2.0V”
when the reading exceeds
the upper limit of voltage.
0.1-2 V/ 1-10 Hz

Clockwise direction:“1.2.3”and clockwise phase sequence icon
Counterclockwise direction:“3.2.1”and counterclockwise phasesequence icon

(8) RCD test
• Nominal system voltage: 100 V/ 230 V/ 400 V, 50/ 60 Hz(operating uncertainty is maintained in the range of -15%+10%)• Input voltage range: 85 V-440 V, 50/ 60 Hz (Frequency display range: 45-65 Hz)
Measurable voltage is limited to 190 - 440 V when the rated residual current IΔn is
100 mA or 200 mA and to 190 - 260 V when the current is 500 mA.
Test current
Rated
residual
Current
Mode
Accuracy
current(mA) value (mA)
@230 V
IΔn
RMS
×1/2
×1

Ramp
( )

15/30/
50/100/200/500

Energizing time
Energizing time

Accuracy
Trip time±1%rdg±2 ms
Energizing
time
FS±3%

IΔn×1/2-8% to -2%

2000 ms(default setting)

IΔn+2% to +8%

550 ms

IΔn×1.1

20%-110% of rated
residual current.
Energizing time
-4% to +4% Current increases every
FS±3%
10%, 10 steps in total.
300 ms/ step・Test current：Sine wave
・Energizing time for ×1/2 can be changed by using the app.

8

(9) EV charger check
1. CP signal measurement
Range

Display range

Voltage
Measuring range
Vtop(guaranteed
Vbase
accuracy)Frequency
Duty

15.0V
Voltage Vtop:2.0 V to 15.0 V
Voltage Vbase：-15.0 V to -2.0 V, ---, -V*1
Frequency：DC*2, 10 to 1100 Hz
Duty：10.0% to 96.0%*1: In case of DC,“---,-V”is displayed for Vbase.
*2: The LCD shows“DC”when frequency is 0 Hz or
higher and less than 10 Hz.
Voltage Vtop:2.0 V to 15.0 V
Voltage Vbase: -15.0 V to -2.0 V
Frequency: 980 to 1020 Hz
Duty: 10.0% to 96.0%

Voltage Vtop: <2.0 V, >15.0 V
Voltage Vbase: <-15.0 V, >-2.0 V
Indications out of
Frequency: >1100 Hz
display range
Duty: <10.0%, >96.0%, ---%** Displayed when the frequency is less than 980 Hz orover 1020 Hz.

Max.
charging
current

CP STATE

Accuracy

Voltage: ±4dgt
Frequency: ±0.5%rdg±4dgt
Duty: ±10dgt

Range

80.0 A

Display range

6.0 A-80.0 A

Indications out of
display range---A*(* Displayed when Duty is“---%”.)

Accuracy

Varies depending on the accuracy of duty measurement.

FormulaWhere:
10%≦Duty [%]≦85%, Duty [%] × 0.6 A, and85%<Duty [%]≦96%, (Duty [%] - 64) × 2.5 A

Criteria ofjudgement

When Vtop is within the following range and meets thefollowing conditions 1. and 2., CP STATE is judged anddisplayed based on the voltage value of Vtop.
If condition 1. or 2. is unsatisfied, the LCD shows “---”.
• A(Not connected):11 V≦Vtop≦13 V• B(Connected):8 V≦Vtop≦10 V• C(Ready to charge):5 V≦Vtop≦ 7 V• D(Ready to charge, ventilation required): 2 V≦Vtop≦4 V
Conditions:
1. Frequency is DC and CP STATE is A.
2. In any of CP STATE B/C/D, frequency is between 995
and 1005 Hz, and Vbase is within -13.0 V to -11.0 V.

92. EV/ Latch locking
Measuring range and accuracy are the same as for continuity measurement.
Lock/ unlock state is judged by the measured resistance and the result is displayedon the LCD as follows.
StatusResistance range

Lock

135 Ω-165 Ω

Judgement
The LCD shows“✓”symbol when the resistances
measured at latch switch is locked and unlocked state arewithin the allowable range respectively.

Unlock432 Ω-528 ΩWhen both measured resistances are within the allowable
range,“✓”symbol is displayed at the middle right areaof the LCD.
In other cases, the LCD shows“×”symbol.

3.2 Possible number of measurements within the effective battery voltage
Measurement: 5 sec., Pause: 25 sec. (Measures RCD once every 30 sec.)
Function

Possible number of measurements
within the effective battery voltage
2000 times or more2000 times or more2000 times or more2000 times or more2000 times or more2000 times or more
1500 times or more
1500 times or more
3500 times or more
3000 times or more
Approx. 35 hours

Test resistanceContinuity

1Ω
0.025 MΩ
0.05 MΩ
0.1 MΩ
Insulation
0.125 MΩ
resistance
0.25 MΩ
0.5 MΩ
1 MΩ
RCD ×1 30 mA
Earth resistance10 Ω
Voltage/ Phase rotation 25V
50V
100V
125V
250V
500V
1000V

3.3 Others

Applicable standards

Location for use• IEC 61010-1, -2-030
CAT III 600 V / CAT IV 300 V Pollution degree 2• IEC 61010-2-034• IEC 61557-1, -2, -3, -4, -5, -6, -7, -10• IEC 60529 (IP40)• IEC 61010-031
MODEL 7281…CAT III 600 V/ CAT IV 300 V(Use of cap is required in CAT III or
higher environment.)
MODEL 7247…CAT III 600 V/ CAT IV 300 V* When test leads are connected to and used with the
instrument, the lower category either of them belongs
to is applied.
• IEC 63000 (Environmental standard: RoHS)
Altitude 2000 m or less, In-door use

10

Nominal system voltage
100 V/ 230 V/ 400 V 50 Hz/ 60 Hz
Operating temp. & humidity range -10℃ to +50℃ 80％ RH or less (no condensation)
Storage temp. & humidity range -20℃ to +60℃ 75％ RH or less (no condensation)
External communication
Bluetooth Ver 5.0
5160 V AC (50/ 60 Hz)/ 5 sec.
Withstand voltage(between electrical circuit and enclosure)
50 MΩ or more/ 1000 V DC
Insulation resistance(between electrical circuit and enclosure)Turns off the instrument automatically if there is no functionchange, range change or switch press for about 10 min.
In case of the following cases, auto power off function
doesn't work.
- While voltage of 30 V or higher is being applied to the
Auto-power-off function
instrument,(in case of CP signal measurement, a square wave of 2
V or higher or DC voltage is being applied to)- measurement is being performed, or- during Bluetooth communication.
Automatically turns off if there is no activity for about 2
Backlight
min. (Auto off is disabled during a measurement.)
Dimension
136(D)×235(W)×114(H) mm
WeightApprox. 1300 g (including batteries)
LCD
Color TFT LCD (320×240 dots)
Power supply
AA battery × 8 (Use of AA Alkaline battery is recommended.)
3.4 Operating uncertainty
Operating uncertainty (B) is an uncertainty obtained under the rated operating
conditions, and calculated with the intrinsic uncertainty (A), which is an error of the
instrument used, and the error (En) due to variations.
According to IEC 61557, the maximum operating uncertainty should be within ± 30%.
B = ± |A| + 1.15 √E2 2 + E3 2
JIS C 1302
(1) Operating uncertainty at insulation resistance measurement (IEC 61557-2)（）

IEC 61557-2
A

Intrinsic uncertainty

E1

Influence of position (N/A since this is a digital tester.)

E2

Influence of supply voltage (until battery status indicator becomes empty

E3

Influence of temperature (IEC 61557-2, 0℃ -35℃ ))* The measuring range to keep the max. operating uncertainty is the same as the 1st
effective measuring range.

11(2) Operating uncertainty at continuity measurement (IEC 61557-4)

A

Intrinsic uncertainty

E1

Influence of position (N/A since this is a digital tester.)

E2

Influence of supply voltage (until battery status indicator becomes empty

E3

Influence of temperature (0℃ -35℃ ))* Measuring range to keep the max. operating uncertainty (within ±30%) is 0.2 to 2000 Ω.
(3) Operating uncertainty at earth resistance measurement (IEC 61557-5)

A

Intrinsic uncertainty

E1

Influence of position (N/A since this is a digital tester.)

E2

Influence of supply voltage (until battery status indicator becomes empty

E3

Influence of temperature (0℃ -35℃ )E4Influence of series interference voltage (True RMS value 3 V)

E5Influence of prove and aux. earth electrode (100×RA≦50 kΩ))* Measuring range to keep the max. operating uncertainty (within ±30%) is 5.0 Ω to2000 Ω.
(4) Operating uncertainty at LOOP 2W measurement (IEC 61557-3)

A
Intrinsic uncertainty
E1 Influence of position (N/A since this is a digital tester.))
E2 Influence of supply voltage (until battery status indicator becomes empty
E3 Influence of temperature (0℃ to 35℃ )E6.2 Influence of phase angle (0° to 30° )E7 Influence of system frequency (-1% to +1%)
E8 Influence of system voltage (85% to 110%)
E9 Influence of harmonics
3th 5%, 7th 5% (Phase angle 0° ), 5th 6% (Phase angle 180° )E10 Influence of series interference voltage (0.5% of nominal voltage)* Measuring range to keep the max. operating uncertainty (within ±30%) is 10.0 Ω to2000 Ω.

12

(5) Operating uncertainty at RCD measurement (IEC 61557-6)

A

Intrinsic uncertainty

E1

Influence of position (N/A since this is a digital tester.)

E2

Influence of supply voltage (until battery status indicator becomes empty

E3

Influence of temperature (0℃ -35℃ )E5Influence of probe resistance

E8

Influence of system voltage)* Probe: An additional earth electrode used as a probe for sampling potentials during
measurement
Rated residual current (IΔn)
Probe resistance
15 mA
300 Ω
30 mA
100 Ω
50 mA
100 mA40 Ω
200 mA
500 mA
Each operating uncertainty shall not exceed the following values.
Range

Test current

×1/2-10% to 0%

×1

0% to +10%

Ramp ( )-10% to +10%13

4. Instrument layout
(4)

(5)

(1)

(2)

(6)

(3)
Fig. 4-1

Name

(7)

Description(1) Test switch

Press to start a measurement. Hold down and turn the switch
clockwise to lock it in the operating position.

(2) POWER switch/
ESC switch

A long press (1 sec. or longer) turns on/ off the instrument.
A short press (less than 1 sec.) works as an ESC switch andreturn to the previous screen.

(3) Function switch

Settings for each measurement are available.

(4) LCD

Color LCD

(5) Rotary switch

Select a measurement function.

(6) MEM (Memory)
switchShort press (less than 1 sec.) while the measured value is being
displayed and held on the LCD saves the measured value, andlong press (1 sec. or longer) recalls or deletes the saved data.

(7) ENTER switch

Confirms operations or settings. A long press (1 sec. or longer)
can display the HELP screen for the currently selected function.

14

Input terminal
(4)
(1)
(2)
(3)

Fig. 4-2

Function

Terminal(1) Measurement
terminal for Insulation,
Continuity, RCD, andVoltage

LINE: Line terminal(2) Terminal for phaserotation

L1: Line 1 (R) terminal

EARTH(PE): Protective earth terminal
NEUTRAL: Neutral (Neutral line) terminal
L2: Line 2 (S) terminal
L3: Line 3 (T) terminal(3) Terminal for earth

H(C): Auxiliary earth electrode (current pole) terminal
E: Terminal for the earth under test
S(P): Auxiliary earth electrode (potential pole) terminal(4) Communication adapter MODEL 8212USB adapter

15

5. Accessories● Test lead
(1) Test leads with remote-control switch MODEL 7281
Extension prod long MODEL 8017B* 1 Protective fingerguard

Insulation cap

Metal tip

Extension prod long MODEL 8017B

Attach the supplied detachable
cap as necessary.
For CAT III 600 V / CAT IV 300 V (w/ cap)
For CAT II 1000 V (w/o cap)
For CAT II 300 V (w/ M-8017B)

Long type and helpful toaccess the distant point.

Fig. 5-1(2) Distribution board test lead MODEL 7247

Red (Line or L1)

Green (Protective Earth or L2)

Black (Neutral or L3)*1

Protective fingerguard

Fig. 5-2*1

Protective fingerguard is a part providing protection against electrical shock and ensuring theminimum required clearance and creepage distances.

16

(3) Earth resistance test leads MODEL 7228A (for precision measurement)
Green cable E, 5 m
Yellow cable S(P), 10 m
Red cable H(C), 20 m

Fig. 5-3(4) Auxiliary earth spikes MODEL 8041
Fig. 5-4• The other accessories(1) Soft case MODEL 9084 × 1(2) Carrying case MODEL 9142 × 1(3) Instruction manual × 1(4) Shoulder strap with buckle MODEL 9151 × 1(5) Shoulder pad MODEL 9199 × 1(6) Size AA Alkaline battery × 8(7) Spare fuse F 500 mA/ 600 V Φ6.3 × 32 mm (SIBA 7009463.0,5)* Stored in the battery compartment area.
• Optional accessories(1) USB adapter MODEL 8212USB

Fig. 5-5(2) Adapter for measurement terminal MODEL 8259
(3) Precision measurement cord set MODEL 7272
(4) Precision measurement cord set MODEL 7245A(5) EVSE adapter KEW 8601 (TYPE 1 plug)(6) EVSE adapter KEW 8602 (TYPE 2 plug)

Connect with EV charging
point/ station.

Fig. 5-6

17

Symbols
Battery status indicator
Indicates that a measurement is in progress.
Live circuit warning displayed when 30 V or higher is applied
to the instrument. (Resistance, Continuity/ Insulation / Earthresistance Function) * Except for LOOP 2W function.
Indicates total judgment result on EVSE or latch locking tests.
：Measured values at latch locking/ unlocking are both within
the criteria of judgement.
：Either of the measured values at latch locking/ unlocking isout of the criteria of judgement.
Displayed when a voltage value exceeding the measuring range
for EVSE function, CP signal measurement or motor rotation.
Comparator function
Displayed when the displayed value is within the judgment
criteria when measuring insulation resistance, earth resistance,and continuity function.
Indicates auto memory function is enabled.
Indicates the data is saved by manual operation. It is possible toflag the desired data on the recall screen.
The data with this mark won't be overwritten even while data areautomatically saved by auto memory function.
Safety lock for insulation resistance measurement
The instrument doesn't start measurement, even though the test
switch is pressed, while the safety lock is enabled.
RH Hi, Rs Hi

Indicates the probe resistance (RH, RS) of H(C) or S(P) terminal
exceeds the measuring range at earth resistance in precision
measurement.

No 3Phase system

Indicates the incorrect wiring on Phase rotation function (Voltage
isn't Three-phase voltage).
Wiring check for RCD, earth resistance, and Loop 2W functions
During the measurement on RCD, earth resistance, or Loopsymbol appears to indicate the internal
2W function, thetemperature is high. Further measurements are suspended until
the symbol disappears.

Uc > UL

Indicates that Uc measured on RCD function is higher than UL
value (50 V).

18

no

Appears at any of the following cases:● On RCD function, the RCD to be tested tripped before startinga measurement. The preset IΔn value might be incorrect.
● On Phase rotation function, voltage/ frequency of the input
voltage exceeds the measuring range.
● RCD tripped during Loop 2W measurement.
Indicates the necessity to reset the RCD tripped at the auto teston RCD function.
Indicates the necessity to press the test switch at themeasurement on EVSE function.
Indicates the necessity to press the trigger on the EV charging
cable at the measurement on EVSE function.

19

6. Setup● Settings of the following items can be made on the SETUP MENU.
(1) LANGUAGE ............ : Language selection(2) TIME........................ : Clock (time and date) adjustment(3) LCD CONTRAST .... : LCD contrast adjustment(4) LCD BACKLIGHT.... : LCD backlight brightness adjustment(5) AUTO MEMORY ..... : Set the auto memory function to ON or OFF.
(6) SYSTEM RESET .... : Restore the instrument settings to default.
● Setting method:(1) Press the POWER switch at least 1 sec. to turn on the instrument.
(2) Press the F4 switch while the start-up screen is displayed (Approx. 2 sec.) after
powering on the instrument.
(3) SETUP screen appears. It is possible to display this screen by pressing the F4
switch on the wiring diagram screen available on Help function.
Selected item ishighlighted inwhite.

Fig. 6-1

Fig. 6-2(4) Press the F1(▲) or F2(▼) switch to select the item you wish to change andconfirm it with the ENTER switch.
(5) Then press the F1(▲) or F2(▼) switch to change the setting.
Items

Settings

LANGUAGEENGLISH, 日本語

TIME

Month/ Day/ Year Hour: Minute

LCD CONTRAST-45% to +45% (by 1%)

LCD BACKLIGHT

10% to 100% (by 10%)

AUTO MEMORY

ON or OFF (Default setting:“ON”)

SYSTEM RESET

Restore the instrument settings to default.

(6) Changed settings are saved by pressing the ENTER switch and the screen
returns to the SETUP screen. Press the ESC switch to cancel changes.
(7) The instrument enters stand-by mode by pressing the ESC switch on SETUP
screen.

20

7. Getting started
7.1 Attachment of metal tip/ adapter to test leads
The following metal tips and adapters are user-changeable depending on measurement
purposes.
(1) MODEL 7281
The following metal tips are available.
1. Standard metal tip: installed at a shipment and supplied with a detachable
insulation cap.
2. MODEL 8017B: long type and helpful to access the distant point.
[How to replace the parts]
Turn the tip of MODEL 7281 counterclockwise and remove the metal tip.
Insert the metal tip you wish to use into the hexagon hole and turn the tip part of theprobe clockwise to tighten firmly.
Male screw
Metal tip

Female screw
Hexagon holeFig. 7-1

Fig. 7-2(2) MODEL 7247
Attach either of the following adapters to MODEL 7247.
[Adapters for MODEL 7247]
1. Alligator clip
2. Test probe[How to replace the parts]
Firmly attach the adapter you wish to use to the end of banana cable.
Alligator clip

Banana plug, both ends

Fig. 7-3

Test probe# DANGER
To avoid getting electrical shocks, disconnect the test leads from the instrument before
replacing the metal tip for test lead with remote-control switch or adapter for banana
cable.

21

7.2 Battery voltage check(1) Please refer to“18.1 Battery replacement”in this manual and insert batteries in the
instrument.
(2) Hold down the POWER switch (at least 1 sec.) to turn on the instrument.
(3) Check the battery status indicator displayed at the upper right corner of the LCD.
Normal. Battery voltage is enough.
Low battery voltage: For continuous measurement, please refer to“18.1
Battery replacement”and replace the batteries with new ones.
Battery voltage is below the lower limit of the operating voltage.
In such a condition, accuracy of the measured result isn't guaranteed.
Replace batteries with new ones immediately.
• Battery status indicator might rapidly change from“”to“”during a measurement
depending on the measured objects; for example, resistance of the object is low.
• Use of size AA Alkaline battery is recommended. Use of other batteries may cause
improper indication of battery level.
7.3 Time adjustment
This instrument has clock function. Time and date are displayed at the upper rightcorner of the LCD.
Time display format: Month/ Day/ Year Hour: Min.

▼▼(1) Enter the SETUP mode to adjust clock. Refer to“6.
SETUP”how to enter setup mode.
(2) Press the F1(▲) or F2(▼) switch and select“TIME”and then press the ENTER switch.
(3) Press the F3( ) or F4( ) switch to select theparameter to be changed.
(4) Press the F1(▲) or F2(▼) switch and alter thevalue and then confirm the change with the
ENTER switch. Pressing the ESC switch during theadjustment can return to the previous step.

Fig. 7-4 Time and date adjustment
7.4 Help function
With this function, correct connection for each measurement can be checked on the LCD.
To check connection diagrams:(1) Select the function and range on which measurement is to be performed and holddown the ENTER(HELP) switch 1 sec. or longer.
(2) Then the LCD shows the corresponding connection diagram.

Fig. 7-5 Example of connection(3) If multiple connections are available, press the F1 switch to toggle the connection
diagrams.
(4) Press the ESC switch to close the currently displayed connection diagram and returnto the measurement screen.
• The instrument enters setup mode by pressing the F4 (SETUP) switch while the LCD
is showing a connection diagram.

22

8. Insulation resistance
To inspect the insulation performance of electrical equipment or circuit, use this
instrument and measure the insulation resistance of them. Check the voltage rating of
the circuit to be measured before making measurement and select the voltage applied to.
• Depending on the circuit to be measured, displayed insulation resistance value may
not stabilize.
• The instrument may give beep sound during an insulation resistance measurement;
however, this is not a malfunction.
• Measurement time may be longer when measuring a capacitive load.
• At an insulation resistance measurement, the output voltage of PE terminal is positive
and of L terminal is negative.
• Connect the PE terminal and the earth (ground) terminal at measurement. It is
recommended to connect the positive side to the earth side when measuring
insulation resistance against ground or when a part of the object under measurement
is earthed. Such connection is known to be more suitable for insulation testing since
insulation resistance values measured with the positive side connected to the earth
are typically lower than those taken through the reversed connection.
# CAUTION
Always disconnect power to the circuit under test before starting insulation resistancemeasurement. Do not attempt to make measurements on a live circuit. Otherwise, it
may damage the instrument.
LINE (-)

Voltage (V)Resistance (RX)Resistance value = Voltage/Current
Current : I

RX = V/I

Fig. 8-1

Earth (+)

8.1 Measurement method
Not only normal insulation resistance but also operating voltage of the Surge Protection
Device (SPD) can be measured on the insulation resistance function.

F1

Output voltage

Measuredvalue
1-min value
DAR/PI value
Elapsedmeasurement time

Comparator reference
value

23

F2
F3

Insulation resistancemeasurement or SPD* For SPD, only 500/1000 V
functions are available.
Rated measurement voltage(25 V,50 V,100 V,125 V,250 V)(500 V, 1000 V)
Buzzer function

F4

Fig. 8-2

Safety lock (enabled for
500/1000 V with default setting)(1) Press the POWER switch and turn on the instrument. Turn the rotary switch and set
to insulation resistance function position.
The insulation resistance function of this instrument is divided into the following two
functions according to the output voltages.
• 25V / 50V / 100V / 125V / 250V ... Low voltage function• 500V/1000V…High voltage function(2) Press the F1 switch and select insulation resistance or SPD.
SPD is selectable only when the rotary switch is set to High voltage function (500V/
1000V).
(3) Check the voltage value which is possible to apply to the circuit under test and press
the F2 switch to select the desired voltage.
(In case of SPD, the apply voltage is fixed to 1000 V.)(4) Connect the test leads and instrument as follows.
LINE EARTH

LINE terminal
Distribution Board test lead, Red (MODEL 7247) or
Test leads with remote-control switch (MODEL 7281)
EARTH terminal
Distribution Board test lead, Green (MODEL 7247)

Red

Green

Fig. 8-3(5) Measure the voltage to confirm that the circuit under test is not energized.
(6) Connect the EARTH terminal of the instrument and the earth terminal of the circuitunder test with the test lead.
(7) Place the tip of test lead to the LINE terminal to the circuit under test and press thetest switch or remote-control switch. (Fig. 8-4, Fig. 8-5, Fig. 8-6)
• The live warning LED blinks and buzzer sounds if a voltage of 30 V or higher exists
in the circuit. While the live warning is being provided, no measurement can be
performed even if the test switch is pressed.
• The LCD shows insulation resistance value at insulation resistance measurement
and breakdown voltage at SPD.
• If the measured value exceeds the limit value of the display range, the symbol“>”is displayed on the LCD.
• The LCD shows elapsed measurement time by 1 sec. during insulation resistancemeasurement. When the elapsed time exceeds 100 min, the time counter stops
and freezes at 99 min. 59 sec.

Fig. 8-4

Fig. 8-5

24

Fig. 8-6 SPD test Connection diagram(8) Auto discharge
This function allows electric charges stored in the capacitance of the circuit under
test to be automatically discharged after measurement. Set the test switch or remotecontrol switch to OFF with the test leads connected. Discharge status can bechecked with the blinking“LIVE”symbol and buzzer.
# DANGER
Never touch the circuit under test right after measurement. Capacitances stored in thecircuit may cause electric shock. Leave the test leads connected to the circuit, and do
not touch the circuit until blinking“LIVE“ goes off.
8.2 Continuous measurement
For continuous measurement, use the lock-down feature incorporated on the test
switch. Pressing and turning the test switch clockwise locks the switch in the operating
position. Turn the switch counterclockwise and unlock it after measurement.
# DANGERHigh voltage is present at the tip of a probe while the test switch is locked down.
Attention should be paid to avoid possible shock hazard.
8.3 Voltage characteristics of measurement terminals
This instrument conforms to IEC 61557. This standard defines that the rated
measurement current shall be at least 1 mA, and the lower limit of the insulation
resistance maintaining the rated measurement voltage at measurement terminals. (Seethe table below.)This value is calculated by dividing the rated voltage by rated current. ie., in case thatthe rated voltage is 500 V, the lower limit of the insulation resistance is found as follows.
Divide 500 V by 1 mA equals 0.5 MΩ. That is, insulation resistance of 0.5 MΩ or moreis required to provide the rated voltage to the instrument.
Rated voltage
25V
50V
100V
125V
250V
500V
1000V
Lower limitof insulation
resistance to0.025 MΩ 0.05 MΩ 0.1 MΩ 0.125 MΩ 0.25 MΩ 0.5 MΩ
1 MΩ
supply rated
measurement
current (1 mA)

25

500V range
250V range

Measurement terminal voltage (V)Measurement terminal voltage (V)1000V range

125V range

100V range

50V range
25V range

Fig. 8-7

Fig. 8-8

8.4 DAR/ PI measurement, 1-min value display
The instrument can measure and calculate DAR (Dielectric Absorption Ratio) and PI(Polarization Index) values automatically during an insulation resistance measurement.
The measured value one minute after the start of measurement can also be displayed.
• The DAR value is displayed in 1 minute and the PI value in 10 minutes after starting ameasurement.
• The following table shows the formula and display range.
FormulaDisplay range

DAR = Resistance value (1 min after a start of test)/Resistance value(15 sec after a start of test)
PI = Resistance value (10 min after a start of test)/Resistance value(1 min after a start of test)
0.00-9.99* If a denominator, the measured resistance, used in the above formula is 0 MΩ or outof display range; the LCD shows“no”as DAR/ PI value. When the calculated DAR/ PI
values exceed the display range, the LCD shows“>9.99”.
8.5 Comparator function
The comparator function is a judgment function that compares the measured value withthe reference value and informs the user by the buzzer (when it is enabled) and“✓”symbol when the measured value is below the reference value.
The following table shows the default setting of insulation resistance function. These
values are changeable via the special application. Please refer to“17.2 KEW Smart
Advanced”.
Rated
measurement
voltage
Criteria ofjudgement

25V

50V

100V

500V

1000V

0.1 MΩ 0.1 MΩ 0.1 MΩ 0.1 MΩ 0.2 MΩ 0.4 MΩ

6 MΩ

26

125V

250V

8.6 SPDThe SPD can measure the voltage (breakdown voltage) at which the surge protection
device operates. Press the test switch or remote-control switch to start a measurement.
The voltage between the L-PE terminal is increased from 0 V to 1000 V. The voltage,
when current of 1 mA or more is detected between the L-PE terminal, is judged asa breakdown voltage. Then voltage output is stopped, and the measured result is
displayed on the LCD.
# DANGERHigh voltage is generated at the tips of the test leads during SPD measurement.
Attention should be paid to avoid possible shock hazard.
• Press the test switch or remote-control switch to start a measurement. Press the F4
switch or ESC switch (short press of less than 1 sec.) to stop the measurement.
• The screen shows the breakdown voltage (DC voltage display) and the assumed AC
voltage. The AC voltage is calculated by the following formula.
AC voltage = breakdown voltage/1.4• If a current of 1 mA or more is not detected during measurement (over-range), thedisplay shows“>1000V”.

Breakdown
voltage (DCV)
Breakdown
voltage (ACV)

Fig. 8-9 SPD measurement screen

8.7 Safety lock function
symbol is displayed in the LCD
The instrument doesn't start a measurement when
above F4 switch. Another press of the F4 switch unlock the safety lock and clears
symbol. When the rated measurement voltage or functions are changed, or the power isturned off, the safety lock function is turned on again.

27

9. Voltage(1) Press the POWER switch and turn on the instrument. Turn the rotary switch and set
to the“VOLTS”position.
(2) Connect the test leads to the instrument as illustrated below.
LINE terminal
Distribution Board test lead, Red(MODEL 7247)
EARTH terminal
Distribution Board test lead, Green(MODEL 7247)
NEUTRAL terminal
Distribution Board test lead, Black(MODEL 7247)

LINE EARTH NEUTRAL

Red

Green

Black

Fig. 9-1(3) Connect the test leads to the circuit under test.
Voltage and frequency values are displayed. (Frequency is displayed for inputs of 2
V or more.)

Voltage between L-PE
Frequency of voltage
between L-PE

Voltage
between L-N
and N-PE

Fig. 9-2

28

10. Continuity# DANGER
Do not apply external voltage to the instrument while performing measurements on
continuity function. Always check the circuit under test is surely de-energized before
starting a measurement.
LINE (+)

Principle of operation:
Resistance = Voltage/Current
RX = V/I

Voltage (V)Resistance (RX)Current: I

Fig. 10-1

Earth (-)

10.1 0 Ω ADJ. function
The 0 Ω adjustment function cancels the resistances of the test leads and internal
circuit and displays the resistance of the DUT only. The maximum resistance which canbe cancelled is 9 Ω.
(1) Press the F1 switch, while“0ADJ OFF”is displayed on the LCD above the F1
switch, during a measurement (displayed value is 9.00 Ω or less).
(2) Confirm that the LCD shows“0.00Ω”and“0ADJ ON”is displayed on the LCD
above F1 switch.
• This 0 ADJ. function doesn't work if the reading is 9 Ω or higher, even if 0Ω ADJ
button is pressed. The warning buzzer also sounds.
• The 0Ω ADJ function can be set to OFF by the following procedure.
- Keep the test leads open with“0ADJ ON”enabled and press the F1 switch while thetest switch is being held down.
10.2 Measurement method

Measuredvalue

F1

Turns on/ off

F2

Turns on/ off buzzer function.

F3

-

F4

-

Fig. 10-2

29

(1) Press the POWER switch and turn on the instrument. Turn the rotary switch and set
to the CONTINUITY position.
(2) Connect the test leads to the instrument as illustrated below.
L

PE

Red

Green

L terminal
Distribution Board test lead, Red (MODEL 7247)
orTest lead with remote-control switch (MODEL 7281)
PE terminal
Distribution Board test lead, Green (MODEL 7247)

Fig. 10-3(3) Firmly contact the ends of test leads (see Fig. 10.4) and then press and lock the test
switch. The LCD shows the resistance value of the test leads.

Fig. 10-4(4) Unlock the test switch and confirm the LCD shows 0.00 Ω.
(5) Confirm that the circuit isn't live and then connect the test leads. (See Fig. 10-5.)

Equipotential bonding

WATER
GAS

Fig. 10-5 Continuity test example

30

(6) Press the test switch and check the resistance value displayed on the LCD.
If the measured value is greater than 2000 Ω, the symbol“>”(indicating exceeding
the measuring range) will be displayed.
# DANGER
The measured results may be adversely affected by the impedance and transientcurrent of the additional operating circuits connected in parallel.
• Protection against live circuit
This instrument is equipped with a protection function to prevent damage even if the
instrument is connected to a live circuit by mistake during resistance and continuity
measurement. That is, the instrument is protected and not be damaged if themeasurement terminal is connected to a live circuit while the terminal is open circuit
state.
10.3 Comparator function
The comparator function is a judgment function that compares the measured value withthe reference value and informs the user by the buzzer (when it is enabled) and“✓”symbol when the measured value is below the reference value.
The default value (factory setting) of the continuity function is 50 Ω.

31

11. Earth resistanceWith the earth resistance measurement function of this instrument, earth resistanceof power distribution lines, in-house wiring system and electrical appliances can bemeasured.
# DANGER• Be extremely careful when measuring earth resistance since high voltage, 50 V max
is generated across H(C) – E terminals.
This instrument can perform the following three types of earth resistancemeasurements.
(1) 3W (Precision measurement)
Accurately measures earth resistance by using earth spikes.
(2) 2W (Simplified measurement)
Uses an existing low earth resistor as an auxiliary electrode and measures theresistance between neutral line and earth electrode.
(3) Loop 2W (2W (LIVE): 2-Wire loop impedance test)
Measures loop impedance between LINE and EARTH of live circuit.
(Normally, this measurement is called as“Loop impedance measurement”.)

F1
F2

Measuredvalue

Switches between 3W, 2W, and 2W(LIVE)
Turns on/ off the buzzer function.
(Not available on LOOP 2W function)

F3

-

F4

-

Fig. 11-1
11.1 Measurement principle(1) Measurement Principle of 3W test (Precision measurement)This instrument makes earth resistance measurements with fall-of-potential method,which is a method to obtain earth resistance value "Rx" by applying AC constantcurrent "I" between the measurement object "E" (earth electrode) and "H(C)"(current electrode) and finding out the potential difference "V" between "E" (earth
electrode) and "S(P)" (potential electrode).
Constant current generator

Voltmeter(Potential)(Current)

Fig. 11-2

E (Earth)32

(2) Measurement Principle of 2W (Simplified measurement)
The measurement principle is basically the same as the precision measurement(3W), but the S(P) terminal is short-circuited with H(C) inside the instrument. This
allows measurement to be made via the two poles: E and the H (C) terminals.
(3) LOOP 2W (2-Wire loop impedance test)
Make connection as the following figure shows so that current I1 flows between
LINE-EARTH in the live circuit.
Here, frequency of current I1 is different from the one of the commercial power
supply voltage.
Measure voltage V2: between LINE-EARTH.
Since the voltages of the commercial power supply voltage V1 and the voltage
applied to Rx (Rx x I1) are mixed in V2, the difference of frequencies can be used toremove V1 to calculate Rx.
The following formula is used.
Rx = (V2–V1)/I1

Current I1

Fig. 11-3
11.2 3W (Precision measurement) and 2W (Simplified measurement) method(1) Press the POWER switch and turn on the instrument. Turn the rotary switch and set
to the EARTH (GROUND) position.
(2) Press the F1 switch and select“3W”or“2W”.
(3) Connect the test leads to the instrument illustrated below. (Fig. 11-4, Fig. 11-5)

H(C)

E

S(P)

Red

Green

Yellow

H(C) terminal
Red cable (MODEL 7228A)
E terminal
Green cable (MODEL 7228A)
S(P) terminal
Yellow cable (MODEL 7228A)

Fig. 11-4 Precision measurement (3W method)

33

H(C)

E

Red

Green

H(C) terminal
Distribution Board test lead, Red (MODEL 7247)
orTest leads with remote-control switch (MODEL 7281)
E terminal
Distribution Board test lead, Green (MODEL 7247)

Fig. 11-5 Simplified measurement (2W method)
Ensure that the test leads are firmly connected to each terminal. Loose connection may
cause contact failure and lead to inaccurate readings.
(4) Connection
3W test (Precision measurement)
Stick the auxiliary earth spikes S(P) and H(C) into the ground deeply. They should bealigned at an interval of 5 to 10 m from the earthed electrode under test.
Connect the precision measurement test leads to the E, S(P) and H(C) terminals on the
instrument respectively as shown in Fig. 11-6, and then connect the test leads (green,
yellow, and red) to the earthed electrode under test (E) and auxiliary earth spike S(P)and H(C) in order.

Green

YellowRed

5–10 m

5–10 mEarthed electrode

Auxiliary earth spikes

under test

Fig. 11-6

Make sure to stick the auxiliary earth spikes in the moist part of the soil.
Give enough water where the spikes have to be stuck into the dry, stony or sandy part ofthe earth so that it may become moist.
In case of concrete, lay the auxiliary earth spike down and water it, or put a wet clothetc. on the spike when making measurement. Aux. earth electrodes cannot be used on
the ground such as asphalt where water will not permeate.

2W test (Simplified measurement)This method is useful when the auxiliary earth spike cannot be stuck.
As an auxiliary earth electrode, use an existing earth electrode (possibly the lowest
earth resistance) and perform measurement using the two-terminal method. A common
earth for a commercial power supply or a lightning rod for a building can be used as anearth electrode. Make connection as shown in the following figure.

34

Indicated
Value Re

Secondaryside

Primary
side

Supply Transformer
Be sure to check
earthed side of acommercial
power supply.

Earthedelectrodeunder test

Where earth for mains supply is used.
Rx = Re – reRx: True resistance
Re: Indicated value
re: Earth resistance of earth electrodeFig. 11-7# DANGER• Use a voltage detector to check a common earth of commercial power supply.
• Do not use this instrument to check a common earth of commercial power supply.
There's a risk of danger since voltage value may not be displayed even though the
instrument is connected to a live circuit, when the connection of the earthed electrode
under test comes off or when the connection of the test leads is incorrect etc.
(5) Earth voltage check
Measure the voltage on the voltage function: the LCD shows earth voltage.
The displayed voltages: L-PE, L-N, and N-PE are the voltages across the terminals
H(C)-E, H(C)-S(P), and S(P)-E, respectively.
Confirm that the displayed voltage is less than 10 V. If the voltage is 10 V or higher(3 V or higher in case of 400 Hz), excessive errors in earth resistance measurement
may be caused. To avoid this, make measurement after reducing the earth voltage;for example, by powering off the equipment which is connected to the earth electrode
under test.
(6) When the LIVE warning is displayed on the LCD, disconnect the instrument from thecircuit under test without pressing the test switch.
(7) Press the test switch or remote-control switch to start a measurement.
# CAUTION• If measurement is made with the test leads twisted or in touch with each other, thereading of the instrument may be affected by induction. For accurate measurement,
test leads should be arranged so as not to be contacted with each other.
• If earth resistance of auxiliary earth spikes is too large, it may result in inaccurate
measurement. Make sure to stick the auxiliary earth spikes H(C) and S(P) into themoist part of the earth carefully and ensure sufficient connections between therespective connections.

35

11.3 LOOP 2W measurement method (2-Wire loop impedance test)
This instrument can measure loop impedance between LINE-EARTH of live circuit.
This measurement is suitable for circuits which don't have neutral wires and cannot bemeasured with simplified measurement since this measurement uses just LINE andEARTH terminals.
Measure the impedance Zx indicated by the dotted line shown in the following figure.
In the example below, impedance Zx contains the resistance of L1 cable, impedanceof transformer, and earth resistance. Thus, this method can be used as a simple earth
check by measuring the total impedance from LINE to EARTH.

EARTH

LINE

EARTH

Fig. 11-8(1) Press the POWER switch and turn on the instrument. Turn the rotary switch and set
to EARTH (GROUND) position.
(2) Press the F1 switch and select“2W(LIVE)”.
(3) Connect the test leads to the instrument as illustrated below. (Fig. 11-9)
LINE

EARTH

LINE terminal
Distribution test leads, Red (MODEL 7247)
EARTH terminal
Distribution test leads, Green (MODEL 7247)
Red

Green

Fig. 11-9

Ensure that the test leads are firmly connected to each terminal. Loose connection may
cause contact failure and lead to inaccurate readings.

36

(4) Connect the test leads to the circuit under test as illustrated below.
Connect the LINE terminal to either L1 or L2 of the circuit under test, whichever is ok.
L1

N

L2
EARTH
EARTH

LINE
LINE

Fig. 11-10(5) When connection completes, check the wiring check symbol on the LCD.
symbol, theIf the symbol indications don't match Fig. 11-11 or the LCD showsconnection is not correct and needs to be corrected.
• The voltage between L and PE is always displayed on the LCD. Stop themeasurement if the voltage displayed after making connection isn't normal value.

orFig. 11-11(6) Press the test switch and check the resistance value displayed on the LCD.
Measurement takes approx. 10 sec.
If the measured value is greater than 2000 Ω, the symbol“>”(indicating exceeding
the measuring range) will be displayed.
# CAUTION
During Loop 2W measurement, test current flows through the earth. This test current
is a low current so as not to trip RCDs rated to 15 mA; however, if leakage current
already generated in the circuit under test, the RCDs may trip. When RCD trips during
a measurement, the LCD shows“no”.
11.4 Comparator function
The comparator function is a judgment function that compares the measured value withthe reference value and informs the user by the buzzer (when it is enabled) and“✓”symbol when the measured value is below the reference value. (Except for Loop 2W
measurement)
The default value (factory setting) of the continuity function is 100 Ω.

37

12. Phase rotation# DANGER
When performing motor rotation test, confirm that no voltage is applied to themeasured object (motor) before starting measurement.
KEW 6514BT can check phase rotation of live circuit; in addition, it has motor rotation
test function to judge the phase rotation by the voltage, which is generated by turning
the motor manually.
• Measurements if the live circuit can be made if voltage value is at least 3 V. This is akind of precheck to confirm the phase rotation while the voltage of the secondary side
is low, for example, when 200 V is applied to the primary side of the transformer.
• At the motor rotation test, it is possible to perform phase rotation test at lower voltage
and frequency than the standard phase rotation test.
F1

F2
F3

Setting of measurement
mode(Phase rotation, Motor
rotation)-

F4-

Voltage across terminals and frequency of L1-L2
voltage(These values won’t be displayed at motor rotation.)Fig. 12-1(1) Press the POWER switch and turn on the instrument. Turn the rotary switch and set
to PHASE ROTATION position.
M- ROTATION”(2) Press the F1 switch and select“PHASE ROTATION”or“-○.
(3) Connect the test leads to the instrument as illustrated below. (Fig. 12-2)
L1

L2

L3

Red

Green

Black

L1 terminal
Distribution Board test lead, Red(MODEL 7247)
L2 terminal
Distribution Board test lead, Green(MODEL 7247)
L3 terminal
Distribution Board test lead, Black(MODEL 7247)

Fig. 12-2

38

(4) Connect the test leads to the circuit under test. (Fig. 12-3, Fig. 12-4)
For motor rotation check, run the motor by hands when connection is properly done.

Fig. 12-3 Phase rotation check

Fig. 12-4 Motor rotation check(5) Check result is displayed as follows.

Fig. 12-5• When the LCD shows“No 3Phase system”or“---”, the circuit under test may not
be Three-phase system or connection may not be correct. Check the circuit under test
and the connections.
• If the message“no”is displayed on the LCD, voltage out of the measuring range may
be applied to the circuit under test. Check the rated voltage and frequency of the circuitunder test.
• If measurement voltage contains harmonics, such as invertor power supply, it may
affect the measurement result.

39

13. RCD
13.1 Measurement principle
This instrument uses a constant current circuit to allow leakage current to flow between
LINE-NEUTRAL and trip RCDs. It is also possible to use earth to pass the leakage
current to the earth.
• At the operating time measurement, the instrument measures the time from the start ofleakage current flowing to RCD trip and display the result on the LCD.
• At Ramp test, gradually increase the leakage current from 20% of the rated residual
current till the RCD trips. The LCD shows the current value when the RCD tripped.
Since this instrument uses a constant current circuit, influence of the fluctuations insystem voltages is less on this instrument.
When the leakage current flows to the earth, voltage (contact voltage Uc) is generated
depending on the magnitude of the earth resistance of the circuit under test. KEW
6514BT monitors the magnitude of this Uc value and stops RCD test when the Uc value
exceeds the limit value (Limit voltage UL 50 V).
13.2 Measurement method
F1
UL value
Measured value
L-PE voltage

F2
F3

Setting of measurementmode(×1/2, ×1, sensitive
current, AUTO)
IΔn Rated residual current
settingPhase rotation (0° or 180°)0°/180° * AUTO only

Wiring check

Fig. 13-1(1) Press the POWER switch and turn on the instrument. Turn the rotary switch and set
to RCD (GFCI) position.
(2) Press the F1 switch to select the desired measurement mode.
×1/2

Applies a half of rated earth and test RCD doesn't trip.

×1

Applies rated residual current and measures RCD tripping time.

Ramp ( )Varies test current from 20% to 110% of rated residual current andmeasure the trip current of RCD.

AUTO

Automatically and continuously performs ×1/2, ×1, and Ramp test.

40

(3) Press the F2 switch to set the rated residual current IΔn.
(4) Press the F3 switch to select the phase to apply measurement current.
(5) Connect the test leads and instrument as follows.
LINE

EARTH

Red

Green

LINE terminal
Distribution Board test lead, Red(MODEL 7247)
EARTH terminal
Distribution Board test lead, Green(MODEL 7247)

Fig. 13-2(6) Connect the test leads to the circuit under test.
Connection for Three-phase 3-Wire

SOURCE

Measurement is performed on the power supply
side and load side of different phases.
In the case of three-phase RCDs, measurement
can be made in any combination of R-S',
S-T' and T-R'. However, depending on the
combination, the operating time may be slightly
different from other combinations due to thestructure of the RCDs.
Connect the LINE terminal of the instrument
and the load side of the RCD and EARTH
terminal and the power supply side of the RCDwith the supplied test leads. (Fig. 13-3)

R S T

EARTH

LINE

R’ S’ T’
LOAD

Fig. 13-3
Connection for Three-phase 3-Wire
SOURCE

N L

EARTH

LINE

Connection for Single-phase
Connect the LINE terminal of the instrument
and the LINE of the load side of the RCD and
EARTH terminal and the NEUTRAL of power
supply side of the RCD with the supplied test
leads.
(Fig. 13-4)
When measuring RCD for Single-phase 3-Wire,
connect the EARTH terminal of the instrument
to the NEUTRAL of the power supply side of the
RCD and the LINE terminal to the LINE (either
is ok) of the load side of the RCD with the
supplied test leads. (Fig. 13-5)

LOAD

Fig. 13-4
Connection for Single-phase
SOURCE

L N L

EARTH

LINE

LOAD

Fig. 13-5
Connection for Single-phase 3-Wire41

Connection using EARTH(earth electrode or protective conductor)
Connect the EARTH terminal of the instrument
to the EARTH (earth electrode or protective
conductor) and LINE terminal to the LINE of theload side of RCD.

SOURCE

N L
LINE
EARTH
EARTH

# DANGER
Extra caution should be taken when applying
current to EARTH for tests since the other RCDs
(Fig. 13-7) may trip and damage the connected
devices and cause accidents.

LOAD

Fig. 13-6
Connection using EARTH

RCD(A)NEUTRAL

LINE

Leakagecurrent

RCD(B)

Fig. 13-7

EARTH(7) When connection completes, check the wiring check symbol on the LCD.
If the symbol indications don't match Fig. 13-8 or the LCD showssymbol, theconnection is not correct and needs to be corrected.
• The voltage between L and PE is always displayed on the LCD. Stop themeasurement if the voltage displayed after making connection isn't normal value.

orFig. 13-8(8) Press the test switch to start measurement.
• For ×1/2, ×1…Trip time of the RCD is displayed on the LCD respectively.
When the RCD doesn't trip, the LCD shows“>”symbol (out of range indication)and full-scale time.

42

Trip time varied depending on the type of RCDs and the time shall complies with thefollowing table. The standard values of tripping time defined by IEC 61009 and IEC
61008 are listed in the table below for IΔn and 5IΔn.
Type of RCD

IΔn(×1)5IΔn(×5)

General(G)300 msmax allowed value

40 ms
max allowed value

Selective(S)500 msmax allowed value

150 msmax allowed value

130 msmin allowed value

50 ms
min allowed value• At ×1/2 (rated residual non-operating current) test, RCD shall not trip.
• Ramp ( )…The tripping current is displayed on the LCD.
(9) Press the F3 (0° /180° ) switch to change phases and repeat step (8).
# CAUTION• If symbol appears on the LCD, it indicates that the test resistor has become hot,and the automatic cutoff circuit has been activated. Cool down the instrument before
starting further measurements. The overheat protection circuit is to protect the test
resistor from thermal damage.
• When the Uc voltage rises to UL value or greater, the measurement is automaticallyceased and "Uc > UL" is displayed on the LCD.
• If the“IΔn”setting is greater than the rated residual current of the RCD, the RCD
may trip and“no”may be displayed on the LCD.
• If voltage exists between the protective conductor and earth, it may influence themeasurements.
• If voltage exists between the neutral point and the earth, it may affect themeasurement; therefore, the connection between the neutral point and the earth ofthe distribution system must be checked before starting a measurement.
• If leakage current flows into the circuit connected to the RCD, it may affect themeasurement.
• The potential fields of other earth installations may influence the measurement.
• Special conditions of RCDs of a particular design, for example S-type, should betaken into consideration.
• When making measurement by using EARTH, the resistance of the probe (earth
electrode) shall not exceed the resistance value specified in the column related to
RCD described in 3.4 Operating uncertainty.
• Use of devices (e.g., capacitors or rotating machinery) connected to the RCD may
significantly delay the trip time.
• Always reset the RCD to its original state after a test.

4313.3 Auto test
Auto test is a function to perform ×1/2, ×1, and Ramp test automatically.
Follow the following procedure to perform the auto test.
(1) Press the F1 switch and select“AUTO”.
(2) Press the F2 switch and select“IΔn”(rated residual current).
(3) Press the F3 switch and select the phase to apply measurement current first.
(When selecting“0° /180°”, measurement is performed for both phases.)(4) Press the test switch to start auto test.
If the RCD tripped at the test, reset the tripped RCD (turn it back ON).
When a live circuit is detected, the following test starts automatically.
(5) The LCD show the result as follows.

Fig. 13-9 Example of result display with 0° /180° setting
Test sequence differs according to the selected phase to be tested.
Phase setting(F3 switch)

Test sequence0°

×1/2(0° )→×1(0° )→Ramp(0° )180°×1/2(180° )→×1(180° )→Ramp(180° )0° /180°

×1/2(0° )→×1/2(180° )→×1(0° )→×1(180° )→Ramp(0° )→Ramp(180° )44

14. EV charger (EVSE function)
Various tests required for electric installation can be performed on only one function(EVSE function). The performable measurements are not only insulation resistance,
voltage, earth resistance, and RCD but also CP signal and latch lock measurement
specially required for EV chargers.
This instrument can test normal EV charger only.
EVSE adapter KEW 8601 or KEW 8602 is required to connect with EV charger.
Press the F1 switch to toggle the test items in order: ①→②…→⑥→①.
① INSULATION (125V/250V)② VOLTS③ EARTH④ CP⑤ LATCH LOCKING⑥ RCD
For the detail of ①, ②, ③, and ⑥, see clause 8, 9,11, and 13 in this manual.
As for the connection, refer to the instruction manual for KEW 8601 or KEW 8602.

INSULATION

RCD

VOLTS

EARTH

LATCH LOCKING

CP

Fig. 14-1

45

14.1 CP signal (CP)CP is the control pilot signal (or called as CP signal) for bi-directional communication
between EV and EV charger. This signal is a square wave or pure sine waveform withfrequency of 1 kHz. This instrument judges and indicates the max. charging current and
CP STATE (EV state) according to the amplitude (max. Vtop and min. Vbase) of CP
signal and Duty ratio.
• Measurement method(1) Press the POWER switch and turn on the instrument. Turn the rotary switch and set
to“EVSE”position.
(2) Press the F1 switch and select“CP”.
(3) Connect the test leads to the instrument as illustrated below.
LINE EARTH

Red

Green

LINE terminal
Distribution Board test lead, Red(MODEL 7247)
EARTH terminal
Distribution Board test lead, Green(MODEL 7247)

Fig. 14-2(4) Connect the test leads to CP and GND terminals of KEW 8601 or KEW 8602
respectively.
(For details, refer to the instruction manual for KEW 8601or KEW 8602.)

EARTH

LINE

GND terminal
CP terminal

Fig. 14-3(5) The LCD shows voltage, frequency, Duty ratio, max. charging current, and CP
STATE.
When the voltage is DC,“DC”is displayed next to the frequency value.
Max. amplitudeMin. amplitude
Duty ratio
Frequency
Max. charging current
CP STATE

Fig. 14-4

46• CP STATE is categorized in four states.
If Vtop and Vbase voltage values don't fall within any of the CP STATE range, the LCD
shows ”---“ instead of CP STATE.
Electric vehicle not connectedElectric vehicle connectedElectric vehicle connected, ready tocharge (ventilation not required)Electric vehicle connected, ready tocharge (ventilation required)14.2 Latch locking test
EV chargers have features to monitor the connection and disconnection of the charging
cable to prevent accidental disconnection of cable during charging and to prevent
theft. To monitor the connection and disconnection of charging cable, the instrument
measures circuit resistance of the latch switch of the charging cable. According to themeasured circuit resistance, it is possible to confirm that the latch switch is in lock or
unlock state.
F1
F2
F3

-

F4

Switches “AUTO” and“MANUAL”.

Fig. 14-5• Measurement method(1) Press the POWER switch and turn on the instrument. Turn the rotary switch and set
to EVSE position.
(2) Press the F1 switch and select“LATCH LOCKING”.
(3) Connect the test leads to the instrument illustrated below.
LINE

EARTH

Red

Green

LINE terminal
Distribution Board test lead, Red(MODEL 7247)
EARTH terminal
Distribution Board test lead, Green(MODEL 7247)

Fig. 14-6

47

(4) Press the F4 switch and select“AUTO”or“MANUAL”.
At the latch locking test, resistance of the circuit under test is measured in order:when the latch switch is locked and then unlocked.
• When selecting“AUTO”, the instrument starts measurement automatically:
there's no need to press the test switch.
• When selecting“MANUAL”, a press of test switch is required to start ameasurement.
(5) Connect the test leads to PP and PE terminals of KEW 8601 respectively.

EARTH

LINE

PE terminal

PP terminal

Fig. 14-7(6) Press the test switch.
The instrument starts measurement and displays the circuit resistance of the locked
latch switch.

Fig. 14-8
If you wish to stop and redo the latch locking test, press the ESC switch. A press of
ESC switch can stop the measurement and re-start the measurement.
(7) Unlock the latch switch and press the test switch. When selecting“AUTO”, there's
no need to press the test switch. (Measurement automatically resumes when thelatch switch is unlocked.) The displayed value is the resistance measured when thelatch switch is unlocked.

Fig. 14-9

48

• Auto test starts when the following conditions are satisfied.
* when the resistance varies ±50 Ω or more from the resistance value measured at thelock of latch switch, or* when there's no variation of ±50 Ω or more for 10 seconds.
14.3 EVSE programmable autotest
It is possible to program the combination and sequence of six types of measurements
which are available on EVSE function and perform a series of tests as programmed.
• Test is performed according to the program: in the programmed sequence.
The LCD shows Help screen for the first measurement -> The first measurement isperformed. -> Help screen for the second measurement -> Second measurement -> …
Display of Help screen can be set to ON/ OFF via the application.
• Program can be set up by using the special application for tablet devices.
The number of programmable measurements is up to 10. (Repeating the samemeasurement multiple times is also possible.)49

15. Memory function
Measured results on each function can be saved in the internal memory. (1000 resultsmax.)
Data can be saved by either of the following two methods.
(1) Manual data save
: Press the MEM switch after a measurement and save thedata.
(2) Auto memory function : No need to press the MEM switch. Measured data is saved
automatically after a measurement.
Auto memory function can be set to ON or OFF on the SETUP screen.
symbol(1) Flag symbol
is attached and displayed for the manually saved data.
Data withsymbol aren't overwritten even if auto memory function is set to ON.
Data No. is assigned to new save data automatically in ascending order but the Data
No. withsymbol is skipped.
(2) The flag symbol
isn't attached to the data saved by using auto memory function.
Data without
symbol is overwritten by the new save data with the same Data No.
(3) It is possible to set thesymbol to the data after saving respectively.
Pressing the F4 switch on the data recall screen can put on or off this flag symbol.
15.1 Manual data save
Measured data can be saved by the following method.
(Press the ESC switch to back to the previous screen.)(1) Start with the screen on which the measured value is held after measurement. (Fig.
15-1)(Voltage measurement is being performed in the background.)(2) Press the MEM switch (less than 1 sec.) and switch the screen to memory screen.
(Fig. 15-2)(3) Set the DATA No. if necessary. (Fig. 15-2)
DATA No. is automatically assigned in ascending order.
If you wish to assign specific DATA No., another setting is required.
• In this case, if the existing DATA No. is entered and saved, the data with the same
DATA No. previously saved is overwritten.
When there's no need to change the automatically assigned DATA No., go to step
(4).

Successfully saved.

Fig. 15-1

Fig. 15-2

50

Press the ENTER switch and highlight the DATA No., and then press the F1(▲) or
F2(▼) switch to change the DATA No. and confirm it with the ENTER switch.
The selectable DATA No. is from 000 to 999.
(4) Press the F4 or MEM switch to save the data.
15.2 Auto memory function
With this function, measured results are automatically saved in the internal memory.
While this function is set to ON,“AUTO”mark is displayed at the upper area of the
LCD.
Auto memory markFig. 15-3
Data is saved at the timing as listed below.
Function

Condition

CONTINUITYINSULATION/ SPD
EARTH

End of measurement.

RCD
INSULATION

EVSE

VOLTS

A short press of the test switch.

EARTH

End of measurement.

CP
LATCH LOCKING
RCDA short press of the test switch.
End of measurement.

VOLTS
PHASE ROTATION/
MOTOR ROTATION

A short press of the test switch.

• At Latch locking test on EVSE function, data is saved only after completion of thelatch locking test - from the start of latch lock measurement to the end of unlock
measurement.

51

15.3 How to recall save data
Measured data can be recalled according to the following procedures.
(Press the ESC switch to return to the previous screen.)(1) Hold down (1 sec. or longer) the MEM switch in the stand-by mode. (Fig. 15-4)
The LCD shows the list of the save data. (Fig. 15-5)(2) Press the F1(▲) or F2(▼) switch and select the data you wish to check and press
the ENTER switch.
(3) The selected data is displayed. (Fig. 15-6)(4) Press the ESC switch twice to return to the measurement screen.
Pressing the F4 switch on the data recall screen (Fig. 15-6) can put on or off the flag
symbol.

Fig. 15-4

Fig. 15-5

Fig. 15-6

15.4 How to delete data
Save data can be deleted according to the following procedures.
(1) Follow the steps from (1) to (3) described in“How to recall save data”to display thedata you wish to delete.
(2) Press the F3 switch. Then the following confirmation message is displayed on the
LCD. Another press of the F3 switch deletes the selected data.
To cancel the deletion, press the ESC switch while the confirmation message isbeing displayed and return to the previous screen.

Fig. 15-752

(3) To delete all data, follow the step (1) described in“How to recall save data”anddisplay the list of save data on the LCD.
Press the F4 switch. Then the following confirmation message is displayed on the
LCD. Another press of the F4 switch deletes all data.
To cancel the deletion, press the ESC switch while the confirmation message isbeing displayed and return to the previous screen.

Fig. 15-8

53

16. How to transfer the save data
The internal memory data can be transferred to PC by using USB adapter MODEL 8212USB
or via Bluetooth communication.

Fig. 16-1

MODEL 8212USB

The saved data can be transferred by either of the following methods.
1. Data transfer by using MODEL 8212USB(1) Download“KEW Report2”and the driver for MODEL 8212USB from our website
and install them in your PC before starting data transfer.
(2) Disconnect the test leads from the instrument.
(3) Insert the plug of MODEL 8212USB into the USB
terminal into the USB terminal of your PC.
(4) Connect MODEL 8212USB to the instrument asshown in Fig. 16-2.
(5) Turn on the instrument. (Any function is ok.)(6) Run“KEW Report2”and click“Download”.
The save data will be downloaded from the internal
memory to the PC. For further details, refer to HELP
of“KEW Report2”.
2. Data transfer via BluetoothFig. 16-2(1) Download and install“KEW Report2”in your PC
before starting data transfer.
(2) Turn on the Bluetooth connection on your PC.
(3) Disconnect the test leads from the instrument.
(4) Power on the instrument. There's no need for concern about the position of therotary switch: any function is ok.
(5) Run“KEW Report2”and click“Download”. The save data will be downloaded
from the internal memory to the PC. For further details, refer to HELP of“KEW
Report2”.

54

17. Bluetooth communication function
17.1 Bluetooth communication
This instrument has a Bluetooth communication function and can perform data
communicate with Android/ iOS tablet devices.
Before starting to use this function, install the special application "KEW Smart
Advanced" in your tablet device. Then you can check the measurement result not only
on site but also in a remote place.
To use this function, connect the tablet device to the internet and download theapplication "KEW Smart Advanced". Some functions are available only while connectedto the internet. For further detail, please refer to "17.2 KEW Smart Advanced".
# WARNING
Radio waves at Bluetooth communication may affect the operations of medical
electronic devices. Special care should be taken when using Bluetooth connection in
the areas where such devices are present.
Cautions:• Using the instrument or tablet devices near wireless LAN devices (IEEE802.11.b/g) may cause radio interferences, lowering of communication speed, resulting insignificant time lag in the display update rate between the instrument and tablet
device. In this case, keep the instrument and the tablet device away from the wireless
LAN devices, or turn off the wireless LAN devices, or shorten the distance between the
instrument and the tablet device.
• It may be difficult to establish communication connection if either the instrument ortablet device is in a metal box. In such a case, change the measurement location or
remove the metal obstacle between the instrument and the tablet device.
• If any leaking of data or information occurs while making a communication using
Bluetooth function, we assume no responsibility for any released content.
• Some tablet devices, even if the application runs properly, may fail to establish
communication with the instrument. Please use another tablet device and try tocommunicate with. If you still cannot confirm the connection, there may be someproblem with the instrument unit. Please contact your local KYORITSU distributor.
• The Bluetooth word mark and logos are owned by Bluetooth SIG, Inc. and we,
KYORITSU, are licensed by them for use.
• Android, Google Play Store, and Google Maps are the trademark or registeredtrademark of Google Inc.
• iOS is the trademark or registered trademark of Cisco.
• Apple Store is the service mark of Apple Inc.
• In this manual, the "TM" and " ® " marks are omitted.
Contain FCC ID: SH6MDBT42Q
Contain IC ID : 8017A-MDBT42Q
CCAM16LP1180T2

55

17.2 Feature of KEW Smart Advanced
It is possible to check the measurement result from a distant place with your tablet
devices by installing the special application "KEW Smart Advanced" in your tablet
device.
The special application "KEW Smart Advanced" is available on download site for free:
Google Play Store for Android device and App Store for iOS devices. (An Internet
access is required.) Please note that communication charge is incurred separately for
downloading applications and using special features of them. For your information,"KEW Smart Advanced" is provided on-line only.
Features of“KEW Smart Advanced”:• Remote monitoring/ checking• Data save/ recall function• Map display
Measured locations can be checked on the Google Maps if the saved data includes
GPS location info.
• Comment editing
Measured result can be saved with comments.
The latest information about "KEW Smart Advanced" can be checked with the site on
Google Play Store or App Store.
• Settings of KEW 6514BT
It is possible to change various settings: ON/ OFF of each function, limitation of
measurement function, and reference value of comparator function.
The following setting items are available.
(1) Date and Time setting (changeable from the setup menu)(2) Download of internal memory data
(3) Measurement restriction on each function(4) Safety lock setting (Insulation resistance)(5) Change of over-range limit value (Insulation resistance)(6) Change of reference value on comparator function (Continuity/ Earth/ Insulation
resistance)(7) Testing duration setting (RCD test) * ×1/2 range only
(8) Number of test items/ sequence/ Help display settings (EVSE test)
Please note that the above listed items may be changed according to the version
upgrade of application.

56

18. Battery and fuse replacement# DANGER• Do not open the battery compartment cover if the instrument is wet.
• Do not replace batteries during a measurement. To avoid getting electrical shock,power off the instrument and disconnect all test leads before replacing batteries orfuse.
• The battery compartment cover must be closed and screwed before making
measurement.
• Fuse for replacement shall be the one rated to 500 mA/ 600 V.
18.1 Battery replacement
Replace batteries with new ones when the battery indicator is "almost empty.

": battery level is# CAUTION• Do not mix new and old batteries nor different types of batteries.
• Install batteries in correct polarity as marked inside.
(1) Power off the instrument and disconnect all test leads from the terminals.
(2) Unscrew two screws and remove the battery compartment cover. (Fig. 18-1)(3) Replace all eight batteries with new ones at once. Observe correct polarity wheninserting new batteries. Use of size AA Alkaline battery (LR6) is recommended.
(4) Attach the battery compartment cover and secure it with two screws.
Date and time setting will be cleared if no batteries were inserted in the instrument 10
min. or longer. When battery replacement is required, be careful not to exceed thisperiod. If the date and time setting is cleared and restored to the default, please do thesetting again.
18.2 Fuse replacement
The continuity measurement circuit is protected by the HRC ceramic type fuse situatedin the battery compartment.
Fuse: F 500 mA, 600 V (Φ6.3 × 32 mm)
SIBA 7009463.0,5• Procedures(1) Power off the instrument and disconnect all test leads from the terminals.
(2) Unscrew two screws and remove the battery compartment cover. (Fig. 18-1)(3) Replace the fuse with new one and check for continuity with another tester. If thefuse has been blown, replace it with the spare fuse.
(4) Attach the battery compartment cover and secure it with two screws.

57

Screw

-

+
-

+

+
Spare fuse

-

+

Fuse

Fig. 18-1

58

19. Strap belt assembly
Attach the strap belt according to the following procedures. By hanging the instrument
around the neck, both hands will be left free for testing.
(1) Attach the Buckle to KEW 6514BT as shown in Fig. 19-1.

Match the hole of the Buckle and the
protrusion at the side face of KEW 6514BT
and slide it upwards.
Fig. 19-1(2) Let the shoulder pad through the strap belt.

Fig. 19-2(3) Pass the strap belt down throughthe buckle from the top, and up.

(4) Pass the strap through the buckle,
adjust the strap for length and secure.

Fig. 19-3

Fig. 19-4

59

Contents
1. Safety warnings ........................................................................................................... 1
2. Features ...................................................................................................................... 4
3. Specifications .............................................................................................................. 6
3.1 Measuring range and accuracy ............................................................................. 6
3.2 Possible number of measurements within the effective battery voltage .............. 10
3.3 Others .................................................................................................................. 10
3.4 Operating uncertainty .......................................................................................... 11
4. Instrument layout ....................................................................................................... 14
5. Accessories ............................................................................................................... 16
6. Setup ......................................................................................................................... 20
7. Getting started ........................................................................................................... 21
7.1 Attachment of metal tip/ adapter to test leads ..................................................... 21
7.2 Battery voltage check .......................................................................................... 22
7.3 Time adjustment .................................................................................................. 22
7.4 Help function........................................................................................................ 22
8. Insulation resistance .................................................................................................. 23
8.1 Measurement method.......................................................................................... 23
8.2 Continuous measurement ................................................................................... 25
8.3 Voltage characteristics of measurement terminals .............................................. 25
8.4 DAR/ PI measurement, 1-min value display ........................................................ 26
8.5 Comparator function ............................................................................................ 26
8.6 SPD ..................................................................................................................... 27
8.7 Safety lock function ............................................................................................. 27
9. Voltage....................................................................................................................... 28
10. Continuity................................................................................................................. 29
10.1 0 Ω ADJ. function .............................................................................................. 29
10.2 Measurement method........................................................................................ 29
10.3 Comparator function .......................................................................................... 31
11. Earth resistance ....................................................................................................... 32
11.1 Measurement principle ...................................................................................... 32
11.2 3W (Precision measurement) and 2W (Simplified measurement) method ........ 33
11.3 Loop 2W measurement method (2-Wire loop impedance test) ......................... 36
11.4 Comparator function .......................................................................................... 37

DISTRIBUTOR

Instruction manual

Kyoritsu reserves the rights to change specifications or designs described in thismanual without notice and without obligations.

Multifunction Tester

KEW 6514BT
02-24
02-24

92-2453
92-2453