KYORITSU KEW6024PV User manual

Instruction manual
PV insulation earth tester
KEW6024PV
06-16 92-2290
DISTRIBUTOR
Kyoritsu reserves the rights to change specifications or designs described in this
manual without notice and without obligations.
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 60 
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Memo
Contents
1. Safety warnings ................................................................................... 1
2. Features............................................................................................... 7
3. Specifications....................................................................................... 9
4. Name of parts .................................................................................... 14
5. Accessories........................................................................................ 19
6. Preparations for measurement .......................................................... 21
6-1 Battery voltage check ................................................................... 21
6-2 Attaching metal tip/ adapter to test leads...................................... 21
7. Insulation resistance measurement on PV systems .......................... 23
7-1 Measuring method ........................................................................ 25
8. Insulation resistance measurement ................................................... 31
8-1 Measuring method ........................................................................ 32
9. Earth resistance measurement.......................................................... 36
9-1 Measurement principle ................................................................. 36
9-2 Simplified measurement ............................................................... 37
9-3 Precision measurement (with MODEL7228A test leads).............. 40
10. Voltage measurement...................................................................... 44
10-1 Measuring method ...................................................................... 44
11. Alarm function .................................................................................. 46
11-1 Alarm function ............................................................................. 46
11-2 How to set alarm ......................................................................... 46
11-3 Display example – Alarm setting ................................................. 48
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12. Memory function .............................................................................. 49
12-1 How to save ................................................................................ 50
12-2 How to recall ............................................................................... 52
12-3 How to delete.............................................................................. 53
13. System clock settings ...................................................................... 54
13-1 How to adjust .............................................................................. 54
14. Data communication function .......................................................... 56
14-1 How to transfer data...................................................................... 56
15. Battery replacement......................................................................... 57
16. Shoulder strap and soft case attachment ........................................ 58
16-1 How to attach shoulder strap ...................................................... 58
16-2 How to attach soft case............................................................... 59
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 1 
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1. Safety warnings
This instrument has been designed, manufactured and tested according to
IEC 61010: Safety requirements for Electronic measuring apparatus, and
delivered in the best condition after passing quality control tests.
This instruction manual contains warnings and safety rules which have to be
observed by the user to ensure safe operation of the instrument and to
maintain it in safe condition. Therefore, read through these operating
instructions before using the instrument.
WARNING
●Read through and understand the instructions contained in this manual
before starting to use 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 and/or damage to the instrument.
The symbol indicated on the instrument, means that the user must
refer to the related parts in the manual for safe operation of the instrument.
It is essential to read the instructions wherever the symbol appears in the
manual.
DANGER : is reserved for conditions and actions that are likely to
cause serious or fatal injury.
WARNING : is reserved for conditions and actions that can cause
serious or fatal injury.
CAUTION : is reserved for conditions and actions that can cause
injury or instrument damage.
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Measurement category
To ensure safe operation of measuring instruments, IEC 61010 establishes
safety standards for various electrical environments, categorized as O to
CAT IV, and called measurement categories. Higher-numbered categories
correspond to electrical environments with greater momentary energy, so a
measuring instrument designed for CAT III environments can endure greater
momentary energy than one designed for CAT II.
O (None, Other) : Circuits which are not directly connected to the mains
power supply.
CAT II : Electrical circuits of equipment connected to an AC
electrical outlet by a power cord.
CAT III : Primary electrical circuits of the equipment connected
directly to the distribution panel, and feeders from the
distribution panel to outlets.
CAT IV : The circuit from the service drop to the service
entrance, and to the power meter and primary
overcurrent protection device (distribution panel).
DANGER
●Never make measurements on a circuit in which earth potentials of
300 V or higher (in CAT IV)/ 600 V or higher (in CAT III) exist.
●Use the metal parts for test probes appropriate for the measurement
category they are used in.
●When test probes are connected to the instrument, the lower category
either of them belongs to is applied. Confirm that they are rated for the
measurement voltage of the instrument to be used.
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DANGER
●The instrument is to be used only in its intended applications or
conditions. Otherwise, safety functions equipped with the instrument
don’t work, and instrument damage or serious personal injury may
occur.
●Verify proper operation on a known source before taking actions as a
result of the indication of the instrument.
●Do not attempt to make measurement in the presence of flammable
gasses. Otherwise, the use of the instrument may cause sparking,
which can lead to an explosion.
●Never attempt to make connections of test leads if instrument surface or
your hand is wet.
●Be careful not to short-circuit a power line with the un-insulated metal
tip of the test probes to avoid injuries.
●Do not exceed the maximum allowable input of any measuring range.
●Do not press TEST button when connecting test leads to the instrument.
●Keep the battery compartment cover screwed and closed during a
measurement.
●Do not touch the circuit under test while measuring insulation resistance
or right after measurement to avoid electrical shock.
[Voltage test leads]
●Always use the test leads supplied with this instrument.
●Connect the test leads which are required for the measurement.
●Connect the test leads to the instrument first, and then to the measure-
ment line.
●Keep your fingers behind the barrier during a measurement.
Barrier provides protection against electrical shock and ensuring the
minimum required air and creepage distances.
●Never try to disconnect the test leads from the connectors of the
instrument during a measurement - while the instrument is energized.
●Do not touch two lines under test, at the same time, with the metal tips.
●Never touch the metal tips.
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WARNING
●The instrument is to be used only in its intended applications.
Understand and follow all the safety instructions contained in the
manual. Failure to follow the instructions may cause injury, instrument
damage and/or damage to the equipment under test. Kyoritsu is by no
means liable for any damage resulting from the instrument in
contradiction to these cautionary notes.
●Never attempt to make any measurements if the test leads and/or the
instrument has any structural abnormality, such as a crack or exposed
metal parts.
●Do not install substitute parts or make any modifications to the
instrument. Return the instrument to your local KYORITSU distributor for
repair or re-calibration in case of suspected faulty operation.
●Do not try to replace batteries if the surface of the instrument is wet.
●Connect the test leads firmly to the connectors.
●When replacing batteries, power off the instrument first, and then open
the battery compartment cover.
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 5 
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CAUTION
●Select an appropriate function before starting a measurement.
●Power off the instrument after use, and disconnect the test leads.
Remove batteries if the instrument is to be stored and will not be in use
for a long period.
●Do not expose the instrument to direct sunlight, high temperature,
humidity or dew.
●Use a damp cloth with neutral detergent or water for cleaning the
instrument. Do not use abrasives or solvents.
●Wipe the instrument with a soft cloth, if it is wet, and store it after it’s dry.
Carefully read and observe the precautions with a mark of DANGER,
WARNING, CAUTION and Note: described in each chapter.
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Symbols marked on the instrument
CAT III
Primary electrical circuits of the equipment connected
directly to the distribution panel, and feeders from the
distribution panel to outlets
CATIV
The circuit from the service drop to the service
entrance, and to the power meter and primary
over-current protection device (distribution panel)
Instrument with double or reinforced insulation
User must refer to the explanations in the instruction
manual.
Earth
Never use on a circuit with voltages higher than
600V.
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 7 
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2. Features
KEW6024PV can measure insulation resistances of PV systems with open
voltages of 1000 V or less and of low-voltage installations with voltages of
600 V or less; moreover, earth resistance and AC/ DC voltage of distribution
lines and electrical appliances.
●Designed to meet the following safety standards.
IEC 61010-1,-2-030 CAT III 600V/ CAT IV 300V Pollution degree 2
IEC 61010-031
IEC 61557-1, -2, -5, -10
●Designed, produced and tested according to IEC60529 (IP54)
●Compact and light weight
●Backlight facilitating working in dimly lit areas
* The light automatically turns off if any button isn’t pressed for two minutes.
●The instrument automatically turns off if any button isn’t pressed for 10
minutes. This feature is disabled during a continuous measurement.
●Test probe with a remote control switch is supplied as standard accessory.
●Soft case – instrument is accessible while in use
●Strap belt allowing both hands free
●Replaceable metal tips are supplied as standard accessories
●Audible and visible live circuit warning
●Internal memory can store up to 1000 results. Data transfer and analysis to/
on a PC is possible by using the special software.
●Automatic AC/ DC detection at voltage measurement
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●Insulation resistance measurement
- When insulation resistance like a capacitive load is measured, electric
charges stored in a capacitive circuit are automatically discharged after
measurement. Discharge can be checked with the live warning LED, red
backlight, blinking symbol on the LCD and buzzer.
- Bar graph display
- Buzzer beeps when the measured value drops below or exceed the
pre-set threshold value.
- For safety reasons, a long press is required to select 1000V range.
It is possible to disable 1000V range.
* Special features for measurement on PV systems
- Measured voltages are displayed in stand-by mode.
- Elapsed time, after starting a measurement, is displayed with the
measured values.
- Auto-discharge with voltage display and also with the measured value
●Earth resistance measurement
- Measured earth voltage is displayed in stand-by mode. The LED lights up
if the measured voltage is relatively high.
- In precision measurement, warning indication will be displayed and the
LED lights up if the auxiliary earth resistance it too high.
- Easy to perform simplified measurement with two test probes on simplified
measurement function.
- Buzzer beeps when the measured value drops below or exceed the
pre-set threshold value.
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 9 
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3. Specifications
●Measuring range and accuracy (23ºC±5ºC, RH 75% or less)
PV insulation resistance measurement
Rated measurement
voltage (DC) 500V 1000V
Range
(3-range auto) 20/ 200/ 2000MΩ
Display range
20MΩrange : 0.00 - 19.99 MΩ
200MΩrange : 15.0 - 208.9 MΩ
2000MΩrange : 159 - 2099 MΩ
Open voltage (DC)
Rated measurement voltage x
1 - 1.2 times
* Output voltage is to be divided by the
current-limiting resistor of 1 MΩat
Earth terminal and the resistor at the
connected terminal.
Short-circuit current 1.5 mA or less
Measuring range 1.51 - 200.0 MΩ1.51 – 1000 MΩ
Accuracy ±(1.5%rdg+5dgt)
Measuring range 0.00 - 1.50 MΩ
200.1 – 2000 MΩ
0.00 - 1.50 MΩ
1001 – 2000 MΩ
Accuracy ±(5%rdg+6dgt)
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 10 
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Voltage/ Earth voltage measurement
Measuring range Display range (2-range auto) Accuracy
5 to 600 V AC
(45 - 65Hz)
300V range: 0.0 to 314.9 V
600V range: 240 to 629 V ±1%rdg±4dgt
±5 to ±1000 V DC 500V range: 0.0 to ±524.9 V
1000V range: ±400 to ±1049 V
Measuring method: True RMS
* Automatically detect AC/ DC when an input voltage is 5 V or higher and
show AC or DC symbol on the LCD.
* Input terminals are shown in the following table.
LINE-EARTH when selecting a voltage function
C(H)-E when selecting a simplified measurement function
P(S)-E when selecting a precision measurement function
Earth resistance measurement
Precision/
simplified
Range
(3-range auto)
Measuring
range
Display
range Accuracy*1
20Ωrange
0.00 - 2000 Ω
0.00 - 20.99 Ω±3%rdg±0.1 Ω
200Ωrange 16.0 - 209.9 Ω±3%rdg±3dgt
2000Ωrange 160 - 2099 Ω
Measuring method: Constant current inverter/ 825 Hz
20Ωrange : approx. 3 mA
200Ωrange : approx.2 mA
2000Ωrange : approx. 1 mA
* For precision measurement, auxiliary earth resistance should be 100 Ω
±5% or less.
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 11 
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Insulation resistance measurement
Rated measure-
ment voltage (DC) 250V 500V 1000V
Range
(3-range auto) 20/ 200/ 2000MΩ
Effective display
range
20MΩrange : 0.00 - 20.99 MΩ
200MΩrange : 16.0 - 209.9 MΩ
2000MΩrange : 160 - 2099 MΩ
Open-circuit
voltage (DC) Rated measurement voltage x 1 - 1.2 times
Short-circuit current 1.5 mA or less
Rated current
(Lower limit resistance)
1.0 - 1.2 mA
0.25 MΩ0.5 MΩ1 MΩ
1st
effective
measuring
range
Measuring
range [MΩ] 1.51 - 100.0 1.51 - 200.0 1.51 - 1000
Mid. value 50 MΩ50 MΩ50 MΩ
Accuracy
(Intrinsic
error)
±1.5%rdg±5dgt
2nd
effective
measuring
range
Measuring
range [MΩ]
1.20 - 1.50
100.1 - 2000
1.20 - 1.50
200.1 - 2000
1.20 - 1.50
1001 - 2000
Accuracy
(Intrinsic
error)
±5%rdg±6dgt
Other measuring
range 0.00 - 1.19 MΩ
Accuracy
(Intrinsic error) ±5%rdg±6dgt
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 12 
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Complies with the following standards:
●IEC 61010-1, -2 -030 CAT III 600V, CAT IV 300V Pollution degree 2
●IEC 61557-1, -2, -5, -10
●IEC 60529 IP54 (MODEL7196A/ IP40, MODEL7243/ IP42)
●IEC 61326-1, -2-2 Class B
●IEC 61010-031 MODEL7196A ......... CAT III 1000V, CAT IV 600V
MODEL7244A......... CAT III 1000V, CAT IV 600V*1
*1 Using the flat test prod is CAT II 600V rated.
* When test probes, sometimes with metal tips, are connected to the
instrument, the lower category either of them belongs to is applied.
●EN 50581 RoHS directive
●Location for use Altitude 2000m or less, in-door use
●Display Segment display with backlight
●Temperature & humidity range 23ºC±5ºC, RH85% or less
(accuracy guaranteed) (no condensation)
●Operating temperature -10ºC to 50ºC, RH80% or less (no condensation)
& humidity range * In a range of 40ºC to 50ºC, RH70% or less
●Storage temperature -20ºC to 60ºC, RH75% or less (no condensation)
●Withstand voltage 5160 V AC (50/60Hz) / 5 sec
Between electrical circuit and enclosure
●Insulation resistance 50MΩor more/ 1000 V DC
Between electrical circuit and enclosure
●Auto-power-off Turns off the instrument automatically, after
a beep sound , if there is no function change,
range change or button press for about 10 min.
(*not work while performing a measurement)
●Backlight Automatically turns off if there is no activity for
about 2 min.
(*Auto-off is disabled during a measurement.)
●Dimensions 84(L) × 184(W) × 133(H) mm
●Weight Approx. 900g (including batteries)
●Power source Six size AA batteries
* Use of alkaline battery (LR6) is recommended.
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 13 
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●Operating uncertainty
Operating uncertainty (B) is an error obtained under the nominal operating
conditions, and calculated with the intrinsic error (A), which is an error of the
instrument used, and the error (En) due to variations. According to
IEC61557, the maximum operating error should be within ± 30%.
●Operating uncertainty in insulation resistance measurements (IEC61557-2)
* Formula: 󰇡 


󰇢
A Intrinsic uncertainty
E1Not applicable
E2Variation due to changing the Battery voltage
(till the battery indicator becomes empty” ”)
E3Variation due to changing the temperature
(-10ºC to 50ºC)
* E1 is not applicable since this is a digital instrument.
* The measuring range to keep operating uncertainty of ± 30% is the same
as the 1st effective measuring range.
●Operating uncertainty in earth resistance measurements (IEC61557-5)
* Formula:   󰇡 






󰇢
A Intrinsic uncertainty
E1Not applicable
E2Variation due to changing the Battery voltage
(till the battery indicator becomes empty” ”)
E3Variation due to changing the temperature
(-10ºC to 50ºC)
E4Variation due to series interference voltage
16·2/3 Hz, 50 Hz, 60 Hz, 10 V DC
400 Hz: 3 V
E5Variation due to resistance of the auxiliary earth
electrode
20Ωrange: 0 – 2 kΩ
200Ωrange: 0 – 20 kΩ
2000Ωrange: 0 – 50 kΩ
* The measuring range to keep operating uncertainty of ± 30% is within
5.00 Ω– 2000 Ω.
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 14 
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●Possible number of measurements where battery voltage is within the
effective range (measurement of 5 sec., pause of 25 sec.)
Function Test
resistor
Possible number of
measurements
PV Insulation
resistance
measurement
500V 0.5 MΩApprox. 2500 times
1000V 1 MΩApprox. 2000 times
Insulation
resistance
measurement
250V 0.25 MΩ
Approx. 2500 times
500V 0.5 MΩ
1000V 1 MΩApprox. 1500 times
Earth measurement
(Simplified/ Precision) 10 ΩApprox. 2500 times
4. Name of parts
(1) Test lead
WARNING
Barrier is a part providing protection against electrical shock and ensuring
the minimum required air and creepage distances. Always keep your
fingers behind the barrier during a measurement.
Alligator clip
Flat test bar
Barrier
Test probe with remote control switch
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 15 
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(2) Panel side
(3) Terminal part (Connector block)
Fig. 4-2
⑱
⑲ ⑳
Fig. 4-1
③ ④ ⑤ ⑥ ⑦
①
②
⑭
⑬
⑫
⑪
⑩
⑰ ⑯⑮
⑧⑨
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 16 
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Items – Panel side Description
①LCD LCD with backlight
②Test button Starts/ stops a continuous measurement
③Backlight button Turns on/ off the backlight
④Save button Saves the measured result
⑤Read/ delete button Reads out or deletes the saved data
⑥Voltage button Measures voltages
⑦Buttons for earth resistance
measurement
Selects simplified or precision earth
resistance measurement .
⑧LED for aux. earth
Lights up in earth measurement to show the
auxiliary earth electrodes are connected properly.
⑨Earth voltage warning LED
Lights up in earth measurement if the earth voltage
is relatively high.
⑩Power button Powers on/ off the instrument.
(A long press: 1 sec. or longer)
⑪Back button Returns to the previous step at setting.
⑫Down (cursor) button Decreases setting values.
⑬Up (cursor) button Increases setting values.
⑭Setup button Configures each setting.
⑮LED for live circuit warning Alerts the circuit to be tested is live.
⑯Button for insulation
resistance measurement
Selects insulation resistance measurement for PV
system or for the other objects.
⑰Button for rated measure-
ment voltages
Selects a measurement voltage for insulation
resistance measurement. (A long press of
2 sec or longer is required to select 1000V.)
Items – Terminal part Designated function
⑱
●LINE
●EARTH
●PV/ ordinary insulation measurement
●Earth (simplified) measurement
●Voltage measurement
⑲
●C(H)
●P(S)
●E
●Earth (precision) measurement
⑳ OPTICAL ADAPTER For a connection of MODEL8212USB
to transfer saved data to PC
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 17 
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(4) LCD
●Symbols common to all functions
Battery level indicator
Bar graph
(For PV insulation, insulation, earth measurements)
Segments for numerical display
Indicates “Over-range” status – the measured
value is exceeding the positive display limit.
e.g.: In earth measurements, “>2099Ω” may be
displayed. It indicates that the measured value is
exceeding 2099 Ω.
Indicates that a measurement completes and the
result is being held and displayed on the LCD.
Flashes to provide live circuit warning (for PV
insulation, insulation, earth measurement). This
mark also flashes during an insulation resistance
measurement.
Indicates that alarm function is enabled.
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