KYORITSU KEW 3128 User manual

Instruction Manual
High Voltage Digital Insulation Tester
KEW 3128

2KEW3128
Contents KEW3128
Contents
Contents ････････････････････････････････････････････････････････････ 2
1. Safety Warnings･･･････････････････････････････････････････････････ 4
2. Feature ･･･････････････････････････････････････････････････････････ 7
3. Specification ･･････････････････････････････････････････････････････ 9
4. Instrument Layout ････････････････････････････････････････････････16
4. 1 FRONT VIEW ･････････････････････････････････････････････････16
4. 2 SIDE PANEL ･･････････････････････････････････････････････････18
4. 3 TEST LEADS ･････････････････････････････････････････････････19
4. 4 HARD CASE･･････････････････････････････････････････････････19
5. Preparation for Measurement･･････････････････････････････････････20
5. 1 CHECKING THE BATTERY VOLTAGE･･･････････････････････････20
5. 2 TEST LEAD CONNECTION･････････････････････････････････････20
6. Measurement ････････････････････････････････････････････････････21
6. 1 BASIC OPERATION ･･･････････････････････････････････････････21
6.1.1 How to start measurements ･･････････････････････････････････21
6.1.2 Steps for Measurements･････････････････････････････････････23
6.1.3 Setting for Measurement･････････････････････････････････････30
6.1.4 Graph Operation････････････････････････････････････････････33
6.1.5 Menu･･････････････････････････････････････････････････････37
6.1.6 Filter Mode･････････････････････････････････････････････････41
6.1.7 Save Data ･････････････････････････････････････････････････42
6.1.8 Clock Setting･･･････････････････････････････････････････････47
6.1.9 Demo Mode････････････････････････････････････････････････47
6. 2 INSULATION DIAGNOSIS TESTS ･･･････････････････････････････48
6. 3 IR MEASUREMENT ･･････････････････････････････････････49
6.3.1 Setting Item ････････････････････････････････････････････････49
6.3.2 Measured Result ･･･････････････････････････････････････････49
6. 4 PI MEASUREMENT (POLARIZATION INDEX) ･･･････････････50
6.4.1 Polarization Index･･･････････････････････････････････････････50
6.4.2 How to measure PI･･････････････････････････････････････････50

KEW3128 3
KEW3128 Contents
6.4.3 Measured Result ･･･････････････････････････････････････････53
6. 5 DAR MEASUREMENT (DIELECTRIC ABSORPTION RATIO) ･54
6.5.1 Dielectric Absorption Ratio ･･･････････････････････････････････54
6.5.2 How to measure DAR ･･･････････････････････････････････････55
6.5.3 Measured Result ･･･････････････････････････････････････････57
6. 6 DD MEASUREMENT (DIELECTRIC DISCHARGE)･･･････････58
6.6.1 Dielectric Discharge･････････････････････････････････････････58
6.6.2 How to measure DD･････････････････････････････････････････59
6.6.3 Measured Result ･･･････････････････････････････････････････61
6. 7 SV MEASUREMENT (STEP VOLTAGE) ････････････････････62
6.7.1 Step Voltage ･･･････････････････････････････････････････････62
6.7.2 Measurement Setting Items ･･････････････････････････････････62
6.7.3 Measured Result ･･･････････････････････････････････････････64
6. 8 MEASUREMENT SCREEN ･････････････････････････････････････65
6. 9 CAPACITANCE MEASUREMENT ･･･････････････････････････････68
6.9.1 Measurement Screen ･･･････････････････････････････････････68
6. 10 VOLTAGE MEASUREMENT･･････････････････････････････69
6.10.1 Measurement Screen ･･････････････････････････････････････69
6. 11 OTHER FUNCTIONS ･････････････････････････････････････････70
6.11.1 Use of Guard Terminal･･････････････････････････････････････70
6.11.2 Backlight Function ･････････････････････････････････････････71
6.11.3 Auto-power-off function ･････････････････････････････････････71
7. Battery Charging and Replacement ････････････････････････････････72
7. 1 HOW TO CHARGE BATTERY ･･････････････････････････････････72
7. 2 HOW TO REPLACE BATTERY･･････････････････････････････････73
8. Communication Function/ Supplied Software･･･････････････････････75
8. 1 HOW TO INSTALL THE SOFTWARE ････････････････････････････76
8. 2 HOW TO STARTKEW WINDOWS FOR KEW3128･･････････････80
9. Accessories･･････････････････････････････････････････････････････81
9. 1 METAL PARTS FOR LINE PROBE, AND REPLACEMENT ･････････81
10.Disposing the Product ･･･････････････････････････････････････････82

4KEW3128
1. Safety Warnings KEW3128
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
●This instrument outputs high voltages. 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.
○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.

KEW3128 5
KEW3128 1. Safety Warnings
#DANGER
●Put a pair of insulated gloves and use this instrument.
●Never make measurement on a circuit in which the electrical potential
exceeds AC/DC600V.
●Do not attempt to make measurement in the presence of flammable
gasses. Otherwise, the use of the instrument may cause sparking, which
can lead to an explosion.
●Never attempt to use the instrument if its surface or your hand are wet.
●Be careful not to short-circuit the power line with the metal part of the test
leads when measuring voltage. It may cause personal injury.
●Do not exceed the maximum allowable input of any measuring range.
●Do not press the Test Button without test leads connected to the
instrument.
●Never open the Battery Compartment Cover while making measurement.
●Do not touch the circuit under test when measuring insulation resistance or
right after a measurement. You may get an electric shock by a test voltage.
●Stop a measurement if contamination or carbonization which may impair
insulation characteristics is found on the test leads or around the terminals.
●Do not repeat short-circuiting/ opening of test leads intentionally during
insulation resistance measurements. Otherwise, measurements may be
ceased or LCD may become blank due to a malfunction of the instrument.
Aerial discharges occur at the tips of test leads when short-circuiting and
opening the test leads; excessive discharges may impair the performance
of the instrument.
#WARNING
●Never attempt to make any measurement if any abnormal conditions are
noted, such as broken case and exposed metal parts.
●Do not rotate the Range Switch with the test leads connected to the equipment
under test.
● Do not install substitute parts or make any modification to the instrument. Return
the instrument to Kyoritsu or your distributor for repair or re-calibration.
●Do not try to replace battery if the surface of the instrument is wet.
●Be sure to insert the plug into the terminal firmly when using test leads.
●Make sure to power off the instrument when opening the Battery Compartment
Cover for battery replacement.

6KEW3128
1. Safety Warnings KEW3128
#CAUTION
●Always make sure to set the Range Switch to the appropriate position
before making measurement.
●Be sure to set the Range Switch to theOFFposition after use and
remove the test leads. When the instrument will not be in use for a long
period, place it in storage after removing the battery. Instructions how
to remove a battery are described at Clause 7. Battery Charging and
replacement (=>P.72).
●Do not expose the instrument to the direct sun, high temperature and
humidity or dewfall.
●Use a cloth dipped in water or neutral detergent for cleaning the instrument.
Do not use abrasives or solvents.
●When this instrument is wet, please store it after it dries.
●Remove a battery from the instrument and pack it carefully at the time of
transportation.
Symbol
Danger of possible electric shock
Instrument with double or reinforced insulation
DC
AC
Earth terminal
#Must refer to the Instruction Manual to protect humans and devices
CAT. Ⅳ
The circuit from the service drop to the service entrance, and to the
power meter and primary overcurrent protection device (distribution
panel)

KEW3128 2. Feature
KEW3128 7
2. Feature
KEW3128 is a digital high voltage insulation resistance tester with 6-range:
500V, 1000V, 2500V, 5000V, 10000V and 12000V, and can measure up
to 35TΩ. Fine adjustment of voltage setting at each Range is available.
Measured results can be saved in the internal memory; they can be transferred
to a PC via a special USB cord. Measuring data can also be transferred to a
PC in real-time.
● Designed to meet following safety standards:
IEC 61010-1 CAT.IV 600V
● Insulation Resistance Measurement
Test Voltage 12kV (max), Resistance 35TΩ(max),
Short-Circuit Current 5mA (max)
● Insulation Diagnosis Tests
Values of Polarization Index (PI), Dielectric Absorption Ratio (DAR) and
Dielectric Discharge (DD) are displayed automatically, and measurements
of Step Voltage (SV), Leakage Current and Capacitance can be performed.
* Further details of Insulation Diagnosis Test is described in clause
6. 2 (=>P.48).
● Saving the Measured Data
The internal memory can store 32 files (max).
Use of Print Screen Function enables save of screenshots.
● Dual Power Supply
Lead storage battery (12V, 5Ah) should be used for KEW3128. In the
event of interruption, while operating with AC power supply, power to the
instrument is automatically restored by the battery in the instrument.

8KEW3128
2. Feature KEW3128
● Large Display
5.7-inch (320 x 240 dots)
● Graph Display
Variations in insulation resistances and leakage currents under
measurements are displayed as graphs.
When a measurement period exceeds 90 min (IR measurement only),
90min or later portion of the measured result isnt displayed on a graph.
● Application
Data in the internal memory or measuring in real-time can be transferred to
a PC via a special USB adapter. The supplied software facilitates setting of
the instrument and data analysis.
● Live Circuit Warning
LIVE circuit warning symbols plus audible warning
● Auto Discharge Function
When insulation resistance like a capacitive load is measured, electric
charges stored in capacitive circuits are automatically discharged after
measuring. Discharge can be checked with a voltage monitor.
● Backlight Function
Backlight function to facilitate working at dimly illuminated location or at
nighttime work.
● Auto-Power-Off Function
To prevent the instrument being left powered on and conserve battery
power, the instrument automatically turns off approx. 10 min after the last
switch operation.
● Filter Function
KEW3128 provides 3 kinds of Filter functions to alleviate fluctuations in
readings. Details of Filter function are described at 6.1.6 Filter Mode
(=> P.41).

KEW3128 9
KEW3128 3. Specification
3. Specification
● Applicable Standards:
IEC61010-1 CAT.IV 600V Pollution Degree2
IEC61010-031 For Hand-held Probe Assemblies
IEC61326 EMC Standard for electrical equipment for
measurement, control and laboratory use
IEC60529 IP64（with the Bottom Case closed）
CISPR22, 24

10 KEW3128
3. Specification KEW3128
● Measuring Range and Accuracy（under 23±5ºC and 45 – 75%RH）
【Insulation Resistance Tester】
Rated Voltage 500V 1000V 2500V 5000V 10000V 12000V
Max value 500GΩ1.00TΩ2.50TΩ5.00TΩ35.0TΩ35.0TΩ
Accuracy
400k to 50GΩ
±5%rdg±3dgt
800k to 100GΩ
±5%rdg±3dgt
2M to 250GΩ
±5%rdg±3dgt
4M to 500GΩ
±5%rdg±3dgt
8M to 1TΩ
±5%rdg±3dgt
8M to 1TΩ
±5%rdg±3dgt
50G to 500GΩ
±20%rdg
*Accuracy is
not guaranteed
with setting of
250V or less.
100G to 1TΩ
±20%rdg
250G to 2.5TΩ
±20%rdg
500G to 5TΩ
±20%rdg
1T to 10TΩ
±20%rdg
1T to 10TΩ
±20%rdg
10T to 35TΩ
Values are
displayed, but
accuracy isnt
guaranteed.
10T to 35TΩ
Values are
displayed, but
accuracy isnt
guaranteed.
Display Range 400k to 999k
1.00M to 9.99M
10.0M to 99.9M
100M to 999M
1.00G to 9.99G
10.0G to 99.9G
100G to 600G
800k to 999k
1.00M to 9.99M
10.0M to 99.9M
100M to 999M
1.00G to 9.99G
10.0G to 99.9G
100G to 999G
1.00T to 1.20T
2.00M to 9.99M
10.0M to 99.9M
100M to 999M
1.00G to 9.99G
10.0G to 99.9G
100G to 999G
1.00T to 3.00T
4.00M to 9.99M
10.0M to 99.9M
100M to 999M
1.00G to 9.99G
10.0G to 99.9G
100G to 999G
1.00T to 6.00T
8.00M to 9.99M
10.0M to 99.9M
100M to 999M
1.00G to 9.99G
10.0G to 99.9G
100G to 999G
1.00T to 9.99T
10.0T to 35.0T
8.00M to 9.99M
10.0M to 99.9M
100M to 999M
1.00G to 9.99G
10.0G to 99.9G
100G to 999G
1.00T to 9.99T
10.0T to 35.0T
Out-of-
range
display
Lower
limit
<400kΩ<800kΩ<2.00MΩ<4.00MΩ<8.00MΩ<8.00MΩ
<1.8mA <1.65mA <1.65mA <1.65mA <0.263mA <0.315mA
Upper
limit
>600GΩ>1.20TΩ>3.00TΩ>6.00TΩ>35.0TΩ>35.0TΩ
Short-circuit
current
Max 5.0mA
Leakage
current
0.01nA 〜
Output
current
1mA or more,
1.2mA or less
under a load of
0.5MΩ
*Should be
500V or more
1mA or more,
1.2mA or less
under a load of
1MΩ
1mA or more,
1.2mA or less
under a load of
2.5MΩ
1mA or more,
1.2mA or less
under a load of
5MΩ
0.15mA or
more, 0.25mA
or less under a
load of 10MΩ
0.15mA or
more, 0.25mA
or less under a
load of 12MΩ
Note: The Lower limit value within the Display Range is shown when the test
leads are short-circuited and the Upper limit value within the Display
Range is shown when measured values exceeds the Display Range.

KEW3128 11
KEW3128 3. Specification
【Output Voltage】
Rated Voltage 500V 1000V 2500V 5000V 10000V 12000V
Monitor Accuracy ±10%rdg±20V ±10%rdg±20V ±10%rdg±20V ±10%rdg±20V ±10%rdg±20V ±10%rdg±20V
Output Accuracy 0~+20% 0~+10% 0~+10% 0~+10% -5~+5% -5~+5%
Selectable Range 50~600V
(in steps of 5V)
610~1200V
(in steps of 10V)
1225~3000V
(in steps of 25V)
3050~6000V
(in steps of 50V)
6100~10000V
(in steps of 100V)
10100~12000V
(in steps of 100V)
Incorrect readings are displayed when external AC voltages are applied.
【Graph of Resistance-Output voltage Characteristic】
Rated current at 500V, 1000V, 2500V, 5000V Ranges : max 1mA or higher
Rated current at 10kV, 12kV Ranges : max 0.5mA
Above graphs show the relations between output voltages and measurement
resistances.
10kV/12kV Range
0
2,000
4,000
6,000
8,000
10,000
12,000
14,000
0.0001 0.001 0.01 0.1 1 10 100
Insulation Resistance (GΩ)
Output Voltage (V)
12kV
10kV
500V/1000V/2500V/5000V Range
0
1,000
2,000
3,000
4,000
5,000
6,000
0.0001 0.001 0.01 0.1 1 10 100
Insulation Resistance (GΩ)
Output Voltage (V)
500V
1000V
2500V
5000V

12 KEW3128
3. Specification KEW3128
【Volt Meter】
Range Voltage Test
Measuring Range DC Voltage AC Voltage
±30~±600V 30~600V(50/60Hz)
Accuracy ±2%rdg±3dgt
【Frequency】
Range Voltage Test
Measuring Range 45.0 ~ 65.0Hz
Accuracy ±0.2Hz
【Ammeter】
Measuring Range
0.00nA〜2.40mA
Minimum resolution 0.01nA
(determined by resistance
and voltage values)
Depending on the
effective range of
insulation resistances
* The output current can throw 5mA. The current that flows by the lower
bound within the range of the resistance measurement is shown in the table
【Insulation Resistance Tester】of page 10.
When resistance that is lower than the lower bound within the range of
the resistance measurement is measured, the measurement current might
become larger than 2.4mA.
The display in that case becomes>2.40mA".
【Capacity Meter】
Range 500V ~ 5000V Range 10000V / 12000V Range
Accuracy 5.0nF ~ 50.0μF 5.0nF ~ 1.0μF
±5%rdg±5dgt
* Measurements of capacitance of 0.5μor more shouldnt be repeated at
10000V/ 12000V Ranges in a short time. (Rough guide: 5 times/ hour)
* A messageNoise Errormay be displayed on the LCD and a measurement
may be ceased at 10000/12000V Ranges. In this case, select a lower Voltage
Range and test again.
【Calculated Value】
PI,DAR,DD
Measurement Mode PI DAR DD
Display Range 0.00 ~ 999 0.00 ~ 999 0.00 ~ 999
Computational error ±2dgt ±2dgt ±2dgt
● Electromagnetic compatibility (IEC61000-4-3)
Radio-frequency electromagnetic field
= 10V/m : 20times of the specified accuracy

KEW3128 13
KEW3128 3. Specification
●Operating system Dual integration
●Display 320 x 240 dots, 5.7-inch
Monochrome Display
●Low battery warning Battery mark display (in 4 levels)
●Response time approx 30 sec in a range of ±5% of accuracy
approx 60 sec in a range of ±20% of
accuracy (Response time becomes slower
when output voltage becomes lower.)
●Auto-power-off Power-off function operates when 10 min
pass without any key operation.
●Altitude 2000m or less
●Temperature & humidity
range(guaranteed accuracy) 23ºC±5ºC/Relative humidity 85% or less
(no condensation)
●Operating temperature &
humidity range
-10ºC~50ºC/Relative humidity 85% or less
(when operating with an external power
supply, no condensation)
0ºC~40ºC/Relative humidity 85% or less
(when operating with battery, no condensation)
●Storage temperature &
humidity range -20ºC~60ºC/Relative humidity 75% or less
(no condensation)
●Overload protection AC720V/10 sec.
●Withstand voltage AC8770V : between line terminal and
enclosure /5sec (50/60Hz)
AC6880V : between the measuring
terminal and enclosure /5sec (50/60Hz)
AC2330V : between the power connector
and enclosure /5sec (50/60Hz)
●Insulation resistance 1000MΩor more/DC1000Ｖ
(between electrical circuit and enclosure)
●Dimension 330(L)×410(W)×180(D)mm
(Instrument and Hard case )
●Weight approx 9kg (including battery)
(Instrument and Hard case )
●Power source
Rechargeable Lead storage battery
( PXL-12050:12V 5Ah), AC Power supply
(100V ~ 240V, 50 / 60Hz)

14 KEW3128
3. Specification KEW3128
● Current Consumption (representative values at 12V of battery voltage)
Range 500V 1000V
Short-circuiting the output 2650mA 2300mA
Short-circuiting the output
of rated current 1350mA/0.5MΩ1500mA/1MΩ
Opening the output 210mA 220mA
Range 2500V 5000V
Short-circuiting the output 1700mA 1600mA
Short-circuiting the output
of rated current 1650mA/2.5MΩ2000mA/5MΩ
Opening the output 280mA 380mA
Range 10000V 12000V
Short-circuiting the output 1550mA 1550mA
Short-circuiting the output
of rated current 500mA/10MΩ540mA/12MΩ
Opening the output 570mA 650mA
Range Voltage Test
Measuring voltages 210mA
Range All Ranges
On Stand-by 210mA
Backlight is On Increased by 80mA

KEW3128 15
KEW3128 3. Specification
●Continuous measurement: No limitation (IR measurement mode)
* recorded data and graph are max 90 min.
Max 90 min (SV measurement mode)
Max 60 min (PI/DAR/DD measurement mode)
●
Max current consumption and measurement time while rated currents are maintained.
Condition Current consumption Measurement time
500V / 300kΩ
2100mA
or less
Approx
2 hours
1000V / 600kΩ
2500V / 2.4MΩ
5000V / 4.8MΩ
10000V / 20MΩ
12000V / 24MΩ
* Current consumption may exceed above values when low resistances,
which influence the output of rated currents, are measured.
* Measurement time (approx 4 hours) described at page 15 and the
Measurement time in above table are the periods that full-charged
battery voltage drops to the lowest level
* It is recommended to charge the battery with reference to 7.1 How to
charge batterydescribed in the manual before stating to use with the
instrument since the battery voltage may be low due to self-discharge.
●Accessories Line Probe (MODEL7226)
Line Probe with Alligator Clip (MODEL7227)
Earth Cord (MODEL7224)
Guard Cord (MODEL7225)
Communication Adapter
(MODEL8212 USB)
PC Software
Straight Type Metal Parts (MODEL8029)
Power Cord (MODEL7170)
Instruction Manual

16 KEW3128
4. Instrument Layout KEW3128
4. Instrument Layout
4. 1 Front View

KEW3128 17
KEW3128 4. Instrument Layout
Keys
Keys Details
Print Screen/
Backlight Key
Short press : Turn on/ off the LCD Backlight
Long press : Save the displayed screen as a
(1sec or longer) BMP (bitmap) file.
ESC Key Cancel a process, or return to the previous screen.
ENTER Key Confirm entries, or move to the next screen.
UP/DOWN Key Move a cursor or alter setting values.
TEST Button Start measurements.
Range Switch Power on/off the instrument, or select a
Measurement Range.
Shuttle Switch Move a cursor or alter setting values.

18 KEW3128
4. Instrument Layout KEW3128
Connectors
4. 2 Side Panel
バックライト
Power Connector
ESCキー
Battery Cover
ENTERキー
USB Connector

KEW3128 19
KEW3128 4. Instrument Layout
4. 3 Test Leads
Line Probe (red)
Earth Cord (Black)
Guard Cord (Green)
Line Probe
w/Alligator Clip (red)
4. 4 Hard Case
Regulating valve is to balance the air pressure in the Case hermetically sealed
and external atmosphere for easy opening/closing of Case lid.
Do not force to turn it or remove it.
Depending on usage, either Line Probe or Line Probe with Alligator Clip is
connected to the Line terminal.
Regulating valve

20 KEW3128
5. Preparation for Measurement KEW3128
5. Preparation for Measurement
5. 1 Checking the battery voltage
Set the Range Switch to any position other thanOFFwithout connecting
the Power Cord to the Power Connector.
When the Battery Mark shown at the upper right on the LCD is last 1 level
( ), the battery is almost exhausted. Replace or recharge battery
to continue measurements. The instrument operates properly even if
under such a low battery, and such a low battery status may not affect the
accuracy.
When the Battery Mark is vacant ( ), the battery voltage is below the
lower limit of the operating voltage. So the accuracy cannot be guaranteed.
No measurement can be performed even the TEST Button is pressed
down. Refer to Battery Charge and Replacement (=>P.72) and charge or
replace battery.
5. 2 Test Lead Connection
Insert the test lead firmly to the Connector Terminal on the instrument.
Connect the Line Probe (red) or Line Probe with Alligator clip (red) to
the Line Terminal, Earth Cord(black) to the Earth Terminal and Guard
Cord(green) to Guard Terminal. No need to connect Guard Cord when
establishing a guard is not necessary.
Refer toHow to use Guard Terminal(=>P.70) in this manual for further details.
#DANGER
●If the TEST Button is pressed while the Range Switch is at a Range other
thanOFF, high voltages may applied to the test leads and you may get
an electric shock.
●Do not connect the Earth Cord (black) nor Guard Cord (green) to the Line
Terminal.
Carefully read through1. Safety Warnings(P.4) in this manual.