KYORITSU 3128 User Manual

Rated Voltage

500V

1000V

2500V

5000V

10000V

12000V

Max value

500GΩ

1.00TΩ

2.50TΩ

5.00TΩ

35.0TΩ

35.0TΩ

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

Upper limit

<400kΩ

<800kΩ

<2.00MΩ

<4.00MΩ

<8.00MΩ

<8.00MΩ

Lower 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

Measuring Range

0.00nA∼ 2.40mA

Minimum resolution 0.01nA

(determined by resistance and voltage values)

Depending on the effective range

of insulation resistances

Cautionary statement/ Errata sheet

Followings are corrections and additional explanations for KEW3128 Instruction manual.
The contents of this sheet apply to the instrument with firmware ver.1.12 or later.

Specification tale for [Insulation Resistance Tester] on page 10 & 11 of the Instruction manual for KEW3128 is
modified as follows. The lower accuracy limit, display range and out-of-range display at each Voltage Range
are added.
[Insulation Resistance Tester]

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.

P12 Additional explanation to [Ammeter]

[Ammeter]

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

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/1 000V/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

P.11 Additional graph of “Resistance-Output voltage Characteristic” for each Voltage range

[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.
* “Rated measurement current” described in the table at page 11 should be corrected to “Output current”.

P.15 Additional description about current consumption and battery life

 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.

* 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.

P32 Additional explanation to “Setting of Measurement Period”

The smallest value of selectable period is 15 seconds.

P41 Additional explanation to “6.1.6 Filter Mode”

Filter 1 : It uses it to cut the exchange element more than industrial frequency (50/60Hz) when a high electric field

has been generated around the circuit under test.

Filter 2 : Five measured latest data are averaged.

Filter 3 : Filter 1 and Filter 2 are used at the same time.

P.41 Additional explanations to “6.1.7 Save data”

Logging data (REC file) is recorded and saved in 15 seconds later from the beginning of a measurement.
The data 15 seconds or earlier is shown as “--“. When viewing a graph on the LCD of the instrument, the
measured results for 15 seconds from the beginning of a measurement are displayed with a straight line.

* It is same in real-time measurements using the supplied software “KEW Windows”.
The measured value is saved in 15 seconds later from the beginning of a measurement and the data
15 seconds or earlier is shown as “--“.

Following is an example of the display to be shown on “KEW Windows”.

P.48 Additional sentences at “6.3.1 Setting Item”

At IR measurements, continuous measurements over 90 min are possible , however, the displayable area of
the recorded data, graph and analyzed data are 90 min of measured results. The later portions are displayed
with numbers only.

P. 49 Additional sentences at “6.4.2 How to measure PI”

Displayed Items

Details

Insulation Resistance

Measured insulation resistance value

PI Resistance at TIME1,2

PI Resistance value at TIME1 and TIME2

DAR Resistance at TIME1,2

DAR Resistance value at TIME1 and TIME2

PI

Polarization Index value

Pre-set Voltage

Pre-set output voltage value

Output Voltage

Voltage being output

Current value

Current value being measured

Capacitance

Capacitance measured at discharge

DAR

Dielectric Absorption Ratio

PI value

DAR Resistance

at TIME1,2

PI Resistance

at TIME1,2

Pre-set Voltage

Output Voltage

Capacitance

DAR value

Current value

Insulation

DAR Simultaneous display

DAR value is displayed during PI measurements and the measured results are being displayed.
TIME 1 and 2 values for DAR are the ones pre-set in the DAR mode. Refer to 6.5.2 How to measure DAR
and set the time for DAR.
In case that DAR TIME 2 value is higher than PI TIME 2 value, DAR value isn’t displayed on the LCD. A
measurement stop when the PI TIME 2 comes. PI value isn’t displayed in the DAR measurement mode.

P. 52 Amendments to the illustration and table at “6.4.3 Measured Result”

P. 61 Additional sentence at “6.7.2 Measured Setting Items”

In the SV measurement mode, measurements continue after the preset Step time (V5) comes and
automatically stop when 90 min pass.

P.70 Amendments to the description at “6.11.3 Auto-power-off Function”.

The instrument automatically turns off when approx 10 min pass after a measurement with Timer function
activated or 90 min of continuous measurement in SV mode completes.

Instruction Manual

High Voltage Digital Insulation Tester

KEW 3128

2 KEW3128

Contents KEW3128

Contents

Contents ････････････････････････････････････････････････････････････ 2

1. Safety Warnings ･･･････････････････････････････････････････････････4

2. Feature ･･･････････････････････････････････････････････････････････ 7

3. Specification ･･････････････････････････････････････････････････････ 9

4. Instrument Layout ････････････････････････････････････････････････ 16

 4. 1 FRONT VIEW ･･･････････････････

 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･･･

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 Ope

  6.1.5 Menu･･････････････････････････････････････････････････････37

  6.1.6 Filter Mode･････････････････････････････････････････････････41

  6.1.7 Save Data ･････････････････････････････････････････････････ 41

  6.1.8 Clock Setting ･･･････････････････････････････････････････････46

  6.1.9 Demo Mode ････････････････････････････････････････････････46

6. 2 INSULATION DIAGNOSIS TESTS ･･･････････････････････････････47

 6. 3

  6.3.1 Setting Item ････････････････････････････････････････････････ 48

  6.3.2 Measured Result ･･･････････････････････････････････････････48

 6. 4

  6.4.1 Polarization Index ･･･････････････････････････････････････････49

  6.4.2 How to measure PI･･････････････････････････････････････････49

IR MEASUREMENT ･･････････････････････････････････････48

PI MEASUREMENT (POLARIZATION INDEX) ･･･････････････49

ration ････････････････････････････････････････････33

･･････････････････････････････16

･･････････････････････････････････20

KEW3128 3

KEW3128 Contents

  6.4.3 Measured Result ･･･････････････････････････････････････････52

 6. 5

DAR MEASUREMENT (DIELECTRIC ABSORPTION RATIO) ･53

  6.5.1 Dielectric Absorption Ratio ･･･････････････････････････････････53

  6.5.2 How to measure DAR ･･･････････････････････････････････････ 54

  6.5.3 Measured Result ･･･････････････････････････････････････････56

 6. 6

DD MEASUREMENT (DIELECTRIC DISCHARGE) ･･･････････57

  6.6.1 Dielectric Discharge ･････････････････････････････････････････57

  6.6.2 How to measure DD･････････････････････････････････････････58

  6.6.3 Measured Result ･･･････････････････････････････････････････60

 6. 7

SV MEASUREMENT (STEP VOLTAGE) ････････････････････61

  6.7.1 Step Voltage ･･･････････････････････････････････････････････61

  6.7.2 Measurement Setting Items ･･････････････････････････････････61

  6.7.3 Measured Result ･･･････････････････････････････････････････63

 6. 8 MEASUREMENT SCREEN ･････････････････････････････････････64

 6. 9 CAPACITANCE MEASUREMENT ･･･････････････････････････････ 67

  6.9.1 Mea

 6. 10

surement Screen ･･･････････････････････････････････････67

VOLTAGE MEASUREMENT ･･････････････････････････････68

  6.10.1 Measurement Screen ･･････････････････････････････････････ 68

 6. 11 OTHER FUNCTIONS ･････････････････････････････････････････ 69

  6.11.1 Use of Guard Terminal ･･････････････････････････････････････ 69

  6.11.2 Backlight Function ･････････････････････････････････････････70

  6.11.3 Auto-power-off function ･････････････････････････････････････7

7. Battery Charging and Replacement ････････････････････････････････71

 7. 1 HOW TO CHARGE BATTERY ･･････････････････････････････････71

 7. 2 HOW TO REPLACE BATTERY ･･････････････････････････････････72

8. Communication Function/ Supplied Software ･･･････････････････････74

 8. 1 HOW TO INSTALL THE SOFTWARE ････････････････････････････ 75

 8. 2 HOW TO START KEW WINDOWS FOR KEW3128 ･･････････････79

9. Ac

cessories ･･････････････････････････････････････････････････････80

 9. 1 METAL PARTS FOR LINE PROBE, AND REPLACEMENT ･････････80

10.Disposing the Product ･･･････････････････････････････････････････81

0

4 KEW3128

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 with 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.

# WARNIG

● 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.

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. Bat
replacement (=>P.71).

● 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.

tery Charging and

Symbol








#

CAT. Ⅳ

6 KEW3128

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

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

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.47).

● 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.

KEW3128 7

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.

● 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 Circ

uit 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.40).

8 KEW3128

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

KEW3128 9

10 KEW3128

3. Specification KEW3128

 ● Measuring Range and Accuracy （under 23±5ºC and 45 – 75%RH）

【Insulation Resistance Tester】

Rated Voltage 500V 1000V

Max value 500GΩ 1TΩ

0~50GΩ

±5%±3dgt

Accuracy

50G~500GΩ

±20%

* Accuracy

is not
guaranteed
with setting

of 250V

or less.

Short-circuit

current

Rated

measurement

current

1mA or more, 1.2mA

or less under a load of

0.5MΩ

* Should be 500V or more

Max 5.0mA

or less under a load of

Rated Voltage 2500V 5000V

Max value 2.5TΩ 5TΩ

0~250GΩ

Accuracy

±5%±3dgt

250G~2.5TΩ±20% 500G~5TΩ±20%

Short-circuit

current

Max 5.0mA

0~100GΩ
±5%±3dgt

100G~1TΩ±20%

1mA or more, 1.2mA

1MΩ

0~500GΩ
±5%±3dgt

Rated

measurement

current

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

KEW3128 11

KEW3128 3. Specification

Rated Voltage 10000V 12000V

Max value 35TΩ 35TΩ

Accuracy

Short-circuit

current

Rated

measurement

current

0~1TΩ

±5%±3dgt
1T~10TΩ

±20%

10T~35T

Values are displayed, but

accuracy isnt guaranteed

Max 5.0mA

0.15mA or more, 0.25mA
or less under a load of

10MΩ

Values are displayed, but

accuracy isnt guaranteed

0.15mA or more, 0.25mA
or less under a load of

0~1TΩ

±5%±3dgt
1T~10TΩ

±20%

10T~35T

12MΩ

【Output Voltage】

Rated Voltage 500V 1000V

Monitor Accuracy ±10%±20V ±10%±20V

Output Accuracy 0~+20% 0~+10%

Selectable Range

50~600V

(in steps of 5V)

610~1200V

(in steps of 10V)

Rated Voltage 2500V 5000V

Monitor Accuracy ±10%±20V ±10%±20V

Output Accuracy 0~+10% 0~+10%

Selectable Range

1225~3000V

(in steps of 25V)

3050~6000V

(in steps of 50V)

Rated Voltage 10000V 12000V

Monitor Accuracy ±10%±20V ±10%±20V

Output Accuracy -5~+5% -5~+5%

Selectable Range

6100~10000V

(in steps of 100V)

10100~12000V

(in steps of 100V)

 Incorrect readings are displayed when external AC voltages are applied.

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

0.0nA ~ 2.40mA
(determined by

resistance and voltage

values)

Depending on the

effective range of

insulation resistances

【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 0.5μ or 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 operatio

n.

● Altitude 2000m or less

● Temperature & humidity

range(guaranteed accuracy)

● Operating temperature &

humidity range

23ºC±5ºC/Relative humidity 85% or less
(no condensation)

-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 1000MΩ or more/DC1000Ｖ

● Dimension

(between electrical circuit and enclosure
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/0.5MΩ 1500mA/1MΩ

Opening the output 210mA 220mA

Range 2500V 5000V

Short-circuiting the output 1700mA 1600mA
Short-circuiting the output

of rated current

1650mA/2.5MΩ 2000mA/5MΩ

Opening the output 280mA 380mA

Range 10000V 12000V

Short-circuiting the output 1550mA 1550mA
Short-circuiting the output

of rated current

500mA/10MΩ 540mA/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

● Measurement time approx 4 hours (continuous use)

Applying a load of 100MΩ at the Insulation
resistance 12000V Range

● 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

ESC

ENTER

UP/DOWN

TEST

Range Switch

Shuttle Switch

Key

Key

Key

Key

Button

Short press : Turn on/ off the LCD Backlight
Long press : Save the displayed screen as a

(1sec or longer) BMP (bitmap) file.

Cancel a process, or return to the previous screen.

Confirm entries, or move to the next screen.

Move a cursor or alter setting values.

Start measurements.

Power on/off the instrument, or select a
Measurement Range.

Move a cursor or alter setting values.

18 KEW3128

4. Instrument Layout KEW3128

バックライト

Power Connector

ESCキー

Battery Cover

ENTERキー

USB Connector

Connectors

4. 2  Side Panel

KEW3128 19

KEW3128 4. Instrument Layout

Line Probe (red)

Earth Cord (Black)

Guard Cord (Green)

Line Probe
w/Alligator Clip (red)

Regulating valve

4. 3  Test Leads

Depending on usage, either Line Probe or Line Probe with Alligator Clip is
connected to the Line terminal.

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.

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.71) 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.69) 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.

20 KEW3128

KEW3128 6. Measurement

 6. Measurement

 6. 1 Basic Operation

  6.1.1 How to start measurements

Start-up Screen

    Setting the Range Switch to any position other than the OFF position

powers on the instrument. Setting the Switch to the OFF position powers
off the instrument.

    Following Start-up Screen with Model name and Version info is displayed

when powering on the instrument. Then KEW logo will appear.

* Pressing the Enter Key skips the opening screen.

    The Mode Selection Screen app

purchase.

    The instrument remembers the previous selected mode, and starts with

the mode next time it is powered on.

KEW3128 21

ears at the initial operation after

22 KEW3128

6. Measurement KEW3128

How to select a Measurement Mode

    A long press (1 sec or more) of the ESC Key displays the Mode Selection

Screen.

    Measurement modes which are selectable on the Model Selection Screen

are mentioned at Insulation Diagnosis test (=>P.47).

Move the cursor with the UP/ DOWN Key
or Shuttle Switch, and confirm the mode
with the ENTER Key.
Then a process from making settings to a
start of measurement is displayed at the
bottom of the LCD. Measurement Modes
can be switched directly from the Menu.
(=>P.37 Menu)

KEW3128 23

KEW3128 6. Measurement

  6.1.2 Steps for Measurements

Insulation Resistance Measurement

   ①  Check the voltage which can be applied to the circuit under test,

and set the Range Switch to any desired Voltage Range.

   ②  Select the IR (Insulation Resistance) on the Mode Selection

Screen, and press the ENTER Key.

    The instrument gets started with the previously selected mode, and enters

into the stand-by mode.

   ③ Set a voltage value, and confirm it with the ENTER Key.

   ④  Confirmation Screen is displayed. Press the ENTER Key and

confirm the value.