Kewtech KT65DL User Manual

15. Back Light .................................................................................. 47

16. Memory Function ........................................................................ 48

  16.1 How to save the data ......................................................... 48

  16.2 Recall the saved data ......................................................... 50

  16.3 Delete the saved data .

  16.4 Transfer the stored data to PC ............................................ 53

17. General ...................................................................................... 54

18. Battery replacement .................................................................... 55

19. Fuse replacement ........................................................................

20. Servicing and Calibration ............................................................. 56

21. Pat test with the Pat adapter 1 ..................................................... 57

22. Zs tables .................................................................................... 58

23. Case and strap assembly .............................................................

The KT65DL incorporates Anti Trip Technology (ATT) which electronically
bypasses RCDs when performing loop impedance tests. This saves time and
money by not having to take the RCD out of the circuit during testing and is a
safer procedure to follow.
With the ATT function enabled, a test of 15mA or less is applied between
line & earth. It enables l
rated at 30mA and above.
Please read this instruction manual carefully before using this equipment.

oop impedance measurements without tripping RCDs

....................................................... 51

55

60

Contents

1

1 Safe Testing

Electricity is dangerous and can cause injury and death. Always treat
it with the greatest of respect and care. If you are not quite sure how
to proceed, stop and take advice from a qualified person.

1 This instrument must only be used by a competent and trained person

and operated in strict accordance with the instructions. Kewtech will
not accept liability for any damage or injury caused by misu
c

ompliance with the instructions or with the safety procedures.

2 It is essential to read and to understand the safety rules contained

in these instructions. They must always be observed when using the
instrument.

3 This instrument is designed to work in distribution systems where the line

to earth has a maximum voltage of 300V 50/60Hz and for some ranges
where line to line has a maximum

B

e sure to use it within this rated voltage.

For use in the continuity testing and insulation testing modes this

instrument must be used ONLY on circuits which are de-energized.

4 When conducting tests do not touch any exposed metalwork associated

with the installation. Such metalwork may become live for the duration of
the test.

5 Never open the instrument case (except

replacement and in this case disconnect all leads first) because
dangerous voltages are present. Only fully trained and competent
electrical engineers should open the case. If a fault develops, return the
instrument to Kewtech for inspection and repair.

6 If the overheat symbol appears in the display disconnect the instrument

from the mains supply and allow to cool down.

abnormal conditions of any sort are noted (such as a faulty display,

7 If

unexpected readings, broken case, cracked test leads, etc) do not use
the tester and return it to Kewtech for repair.

8 For safety reasons only use accessories (test leads, probes, fuses,

cases, etc) designed to be used with this instrument and recommended
by Kewtech. The use of other accessories is prohibited as they are

y to have the corre

unlikel

9 When testing, always be sure to keep your fingers behind the finger

guards on the test leads.

10 During testing it is possible that there may be a momentary degradation

of the reading due to the presence of excessive transients or discharges
on the electrical system under test. Should this be observed, the test
must be repeated to obtain a correct reading.
Kewtech.

ct safety features.

voltage of 500V 50/60Hz.

for fuse and battery

If in doubt, contact

se or non-

2

11 Do not operate the function selector whilst the instrument is connected to

a circuit. If, for example, the instrument has just completed a continuity
test and an insulation test is to follow, disconnect the test leads from the
circuit before moving the selector switch.

12 Do not rotate rotary switch when test button is depressed. If the function

switch is inadvertently moved to a new function
depressed or in lock-down position the test in progress will be halted.

13 Always check the test lead resistance before carrying out tests. This

ensures the leads are ok before taking measurements. The resistance
of leads and/or crocodile clips may be significant when measuring
low resistances. If crocodile clips can be avoided for low resistance
measurements, this will red

14 When carrying out Insulation Resistance tests, always release the test

button and wait for charged capacitances to totally discharge before
removing the test leads from the test circuit.

uce the erro

r due to lead accessories

when the test button is

Safe Testing

3

2 Instrument

(6)

(1)

(3)

(4)

(5)

(7)
(8)

(2)

(9)

layout  

Fig. 1

Name Operation

(1) Back Light Button

(2) Test Button

(3) Touch Pad

(4) Power Switch Power Switch

(5) Function Switch Function setting (F1 ~ F4)

(6) Display (LCD) Dot Matrix LCD 160(W)X240(H)

(7) Insulation resistance LED

(8) Rotary Switch Selects measurement functions.

(9) MEM (ESC) Button Activates Memory Function, or ESC Key

Switches on/of f the Backlight of the
Display(LCD)

Starts measurements. (press and rotate
for lock down feature)

Checks the electrical potential at the PE
terminal

Aler ts that the test voltage is
output

being

4

Input Terminal

(1)

(2)
(3)

(4)

Instrument
layout

Fig. 2

Function Terminal

Terminal Names for :
INSULATION,
CONTINUITY

(1)

LOOP,
PFC/PSC,
RCD,
VOLTS

Terminal Name for

(2)

PHASE ROTATION

Te r mi n al Na m e fo r

(3)

EARTH

(4) Optical Adapter Co

L : Line

PE : Protective Earth

N : Neutral (for LOOP,PSC/PFC, RCD)

L1 : Line1

L2 : Line2

L3 : Line3

H(C) : Terminal for auxiliary earth spike

E : Terminal for the earth electrode

S(P) : Terminal for auxiliary earth spike

(current)

(potential)

mmunication port

for Model8212USB

5

Accessories

Blue(Neutral)

Brown(Line)

Green(Protective Earth)

Blue(Neutral or L3)

Green(Protective Earth
or L2)

Brown(Line or L1)

Yellow S(P)10m

Green E 5m

Red H(C) 20m

Auxiliary Earth Spikes x2

3

1. Main Test Lead (KAMP12)

Fig. 3

2. Remote Test Lead (ACC064SP)

Fig. 4

3. Distribution Board Test Lead (ACC065)

g. 5

Fi

4. Test Lead Carry pouch･･･x1

5. Carrying Bag･･･x1

6. Instruction Manual･･･x1

7. Shoulder Strap･･･x1

8. Buckle･･･x2

9. Battery･･･x8

10. Optional Accessory

PAT ADAPTER - See Page57

・

Earth Tests Lead(Model7228) and Auxiliary Earth Spikes

・

Fig. 7

Fig. 6

Model8212USB with PC Software KEW Report.

・

Fig. 8

6

The KT65DL Multi-Function tester performs eight functions in one instrument.
1 Continuity
2 Insulation resistance
3 Loop impedance
4 Prospective short circuit current
5 RCD
6 Voltage
7 Phase rotation
8 Earth resistance

Continuity function has the following features:
Live circuit warning Live Circuit warning on the display.
Fuse Protection Continuity Function has a fuse protection function

to prevent a

Wi th this func tion, a fuse ra rely bl ow while

measuring continuity on live conductors.

Continuity Null Allows automat i c sub t r a ction of test lead

resistance from continuity measurements.

Continuity 2Ω Buzzer Buzzer sounds at 2Ω or le ss at Conti nuity

function. (Switchable on or off)

Insulation function has the following features:
Live circuit warning Live Circuit wa
Auto discharge Electric charges stored in capacitive circuits

are discharged automatically after testing by
releasing the test button.

Insulation Resistance LED LED lights up while making measurements at

Insulation function and alerts that test voltage is
being output.

fuse blow at live working.

rning on the display.

4 Features

Loop impedance, PSC/PFC and RCD testing functions have the following
features:

ymbols indicate if the wiring of the

Wiring check Three Wirin

circuit under test is correct.

Over temperature protection

Phase angle selector The test can be selected from either the positive

Detects overheating of the internal resistor (used

for LOOP and PSC/PFC tests) and of the current
control MOS FET (used for RCD tests) displaying
a wa rning symbol and automatic ally halting
further measurements.

(0 ° ) or from th
voltage. This selector is used in the RCD mode to

g s

e n

egative (180 ° ) half cycle of

7

Features

obtain the maximum trip time of an RCD for the
test selected.

UL value selector Select UL (limit of contact voltage) 25V or 50V.

Where Uc (contact voltage) exceeds UL value at
RCD testing, Uc > UL will be displayed without
starting the measurement.

ALL testing functions have the following
Touch Pad Gives an alert, when touching the Touch Pad,

while the PE terminal is connected to Line by

take.

mis

Memory Function Save the measured data in the internal memory.

The da t a can be ed i t e d on a PC by us i n g

Communication Adapter Model8212USB and PC
Software KEW Report.

Auto power off Automatically switches the instrument off after

a period of approxim ately 10 mi nutes. Th e
Auto power off mode can only be cancelled by
switching the instrument on again.

8

5.1 Measurement Specification

Continuity

5 Specification

Open Circuit
Voltage (DC)

5V±20%(*1)

2Ω Buzzer : Buzzer sounds when measured resistance is 2Ω or less.
2Ω Buzzer Accuracy : 2Ω±0.4Ω
(*1) Voltages are output when measurement resistance is under 2100 ohm.

Insulation Resistance

Open Circuit
Voltage (DC)

250V+25% -0%

500V+25% -0%

1000V+20% -0%

Short Circuit

Current

Greater than

200mA

Rated Current Range Accuracy

1mA or greater

@ 250kΩ

1mA or greater

@ 500kΩ

1mA or greater

@ 1MΩ

Range Accuracy

20/200/2000Ω

Auto-Ranging

20/200MΩ

Auto-Ranging

20/200/1000MΩ

Auto-Ranging

20/200/2000MΩ

Auto-Ranging

0~0.19Ω ±0.1Ω

0.2~2000Ω

0~19.99MΩ:

±(2%rdg+6dgt)

20~200MΩ:

±(5%rdg+6dgt)

0~199.9MΩ:

±(2%rdg+6dgt)

200~1000MΩ:

±(5%rdg+6dgt)

0~199.9MΩ:

±(2%rdg+6dgt)

200~2000MΩ:

±(5%rdg+6dgt)

±(2%rdg+8dgt)

9

Specification

Loop Impedance

Function

0.01

ΩRes

L-PE

0.001

ΩRes

L-PE

(ATT)

L-N / L-L

*2 : at 230V
*3 : 230V+10%-15%
*4: 50V~100V
*5: voltages except for *3 and *4

Rated

Voltage

50~260V
50/60Hz

230V

+10%-15%

50/60Hz

100~260V

50/60Hz

50/60Hz

L-N:50~300V

L-L:300~500V

Nominal Test Current
at 0Ω External Loop:

Magnitude/Duration(*2)

20Ω: 6A/20ms

200Ω: 2A/20ms

2000Ω:

15mA/500ms

2Ω: 6A/90ms

L-N: 6A/60ms

N-PE: 10mA/

approx. 5s

20Ω: 6A/20ms

Range Accuracy

20/200/2000Ω

Auto-Ranging

2Ω

20/200/2000Ω

Auto-Ranging

(L-N < 20Ω)

20Ω

±(3%rdg+4dgt) *3

±(5%rdg+15dgt) *4

±(3%rdg+8dgt) *5

±(3%rdg+35mΩ)

±(3%rdg+6dgt) *3
±(3%rdg+8dgt) *4

±(3%rdg+4dgt) *3

±(5%rdg+15dgt) *4

±(3%rdg+8dgt) *5

PSC (L-N/L-L) / PFC (L-PE)

Nominal Test Current
at 0Ω External Loop:

Magnitude/Duration(*6)

Function

PSC

PFC

PFC (ATT)

*6: at 230V

Rated

Voltage

50~500V

50/60Hz

50~260V

50/60Hz

100~260V

50/60Hz

6A/20ms

6A/20ms
2A/20ms

15mA/500ms

L-N: 6A/60ms

N-PE: 10mA/

approx. 5s

Range Accuracy

2000A/20kA
Auto-Ranging

PSC/PFC

accuracy is

derived from

measured loop

impedance

specification and

measured voltage

specification

10

RCD

Accuracy

Function Rated Voltage

X1/2

X1 +2%~+8% 0%~+10%
X5 +2%~+8% 0%~+10%

Ramp(◢) ±4% ± 10%

Auto

RCD Trip Current Duration

Function Type

Trip

Current

Duration

(ms)

230V+10%-15%

50/60Hz

Depending on the accuracy at each function.
Measurement sequence:
X1/2 0°→X1/2 180°→X1 0°→X1 180°→X5 0°→X5 180°
Measurements with x5 are not carried out for RCDs with nominal
current of 100mA or more.

AC 2000 2000 2000 2000 2000 2000

G

X1/2

X1

X5

Ramp

(◢)

A 2000 2000 2000 2000 2000 n.a

AC 2000 2000 2000 2000 2000 n.a

S

A 2000 2000 2000 2000 2000 n.a

AC 550 550 550 550 550 550

G

A 550 550 550 550 550 n.a

AC 1000 1000 1000 1000 1000 n.a

S

A 1000 1000 1000 1000 1000 n.a

AC 410 410 410 n.a n.a n.a

G

A 410 410 410 n.a n.a n.a

AC 410 410 410 n.a n.a n.a

S

A 410 410 410 n.a n.a n.a

AC

G

A n.a

AC

S

A n.a

Trip Current

AC Type A Type

-8%~-2% -10%~0%

RCD Trip Current Duration

10 30 100 300 500 1000

Goes up by 10% from 20% to 110%

00ms×10 times

3

Goes up by 10% from 20% to 110%

500ms×10 times

Trip Time

±(1%rdg+3dgt)

.a

n

n.a

Specification

Earth

Measuring
Frequency

825Hz

Range Accuracy

20/200/2000Ω

Auto-Ranging

20Ω range : ±(3%rdg+0.1Ω)

200/2000Ω range : ±(3%rdg+3dgt)

(Auxiliary earth resistance 100±5%)

11

Specification

PHASE ROTATION

Rated Voltage

Remarks

50-500V

50/60Hz

Volts

Function Rated voltage Measuring Range Accuracy

Frequency

Possible number of tests with fresh batteries.
Continuity : Approx. 2000 times min. at load 1Ω
Insulation Resistance : Approx. 1000 times min. at load 1MΩ (1000V)
LOOP/PFC/PSC : Approx. 1000 times min. (ATT)
RCD : Approx. 2000 times min. (G-AC X1 30mA)
EARTH : Approx. 10

OLT/PHASE ROTATION : Approx. 50H

V

Reference Conditions

Correct phase sequence: are displayed 1.2.3 and
Reversed phase sequence: are displayed 3.2.1 and

Volts

Ambient temperature 23±5℃

Relative humidity 45% to 75%

25~500V
45~65Hz

25~500V
45~65Hz

25~500V ±(2%rdg+4dgt)

45~65Hz ±(0.5%rdg+2dgt)

00 times min. at load 10Ω

mark

mark

Nominal system voltage and

frequency

Altitude Less than 2000m

5.2 Operating error

Continuity (EN61557-4)

Operating range compliant with

EN61557-4 operating error

0.20~1999MΩ ±30%

The influencing variations used for calculating the operating error are denoted
as follows;
Temperature : 0℃ and 35℃
Supply voltage : 8V to 13.8V

230V, 50Hz

Maximum percentage

operating error

12

Insulation Resistance(EN61557-2)

Volt

250V 0.25~199.9MΩ

1000V 1.00~1999MΩ

The influencing variations used for calculating the operating error are denoted
as follows;
Temperature : 0℃ and 35 ℃
Supply voltage : 8V to 13.8V

Loop Impedance(EN61557-3)

Volt

L-PE

L-N 0.40~19.99Ω

The influencing variations used for calculating the operating error are denoted
as follows;
Temperature : 0 ℃ and 35 ℃
Phase angle : At a phase angle 0° to 18°
System frequency : 49.5Hz to 50.5Hz
System voltage : 230V+10%-15%
Supply voltage : 8V to 13.
H

armonics :

D.C quantity : 0.5% of the nominal voltage

Operating range compliant with

EN61557-2 operating error

Operating range compliant with

EN61557-3 operating error

0.40~1999Ω

(0.001ΩRes:0.400~1.999Ω)

8V
5% of 3rd harmonic at 0° phase angle, 5% of 5th harmonic
at 180° phase angle, 5% of 7th harmonic at 0° phase angle

Maximum percentage

operating error

±30%500V 0.50~999MΩ

Maximum percentage

operating error

±30%

Specification

RCD(EN61557-6)

Function Operating error of trip current

X1/2 -10%~0%

X1, X5 0%~+10%

Ramp -10%~+10%

The influencing variations used for calculating the operating error are denoted
as follows;
Temperature : 0 ℃ and 35 ℃
Earth electrode Resistance (shall not exceed below) :

IΔn (mA)

10 2000 2000

30 600 600
100 200 200
300 130 65
500 80 40

1000 40 20

System voltage : 230V+10%-15%
Supply voltage : 8V to 13.8V

Earth electrode resistance (Ω max.)

UL50V UL25V

Table.1

13

Specification

Earth Resistance (EN61557-5)

Operating range compliant with EN61557-5

operating error

5.00~1999Ω ±30%

The influencing variations used for calculating the operating error are denoted
as follows;
Temperature : 0 ℃ and 35℃
Series interference voltage : 3V
Resistance of the probes and auxiliary
earth electrode resistance : 100 x RA, 50kΩ or less
Supply voltage : 8V to 13.8V

5.3 General specification

ment dimensions 2

Instru

Instrument weight:- 1350g (including batteries.)

Reference conditions Specifications are based on the following

1. Ambient temperature: 23±5° C:

2. Relative humidity 45% to 75%

3. Position: horizontal

4. AC power source 230V, 50Hz

5. DC power source: 12.0 V, ripple content 1%

6. Altitude up to 2000m, Indoor use

tery type E

Bat
Operating temperature and humidity.

0 to +40 ℃ , relative humidity 80% or less, no

Storage temperature and humidity

-20 to +60℃ , relative humidity 75% or less, no

Display Dot Matrix LCD 160(W) X 240(H) pixels.
Overload protection The continuity test circuit is protected by a

The insulation resistance test circuit is protected

35 X 136 X 114mm

conditions, except where otherwise stated:-

or less

ight LR6,AA or R6 batteries.

condensation

condensation.

0.5A/600 V fast acting (HRC) ceramic fuse
mounted in the batt
spare fuse is also stored.

by a resistor against 1000 V AC for 10 seconds.

Maximum percentage

operating error

ery compartment, where a

14

5.4 Applied standards

Instrument operating IEC/EN61557-1,2,3,4,5,6,7,10
Standard
Safety standard IEC/EN 61010-1(2001),

CATIII (300V) -Instrument
IEC/EN 61010-031(2008)
CATII (250V)-Test Lead KAMP12
CATIII (600V)-Test Lead ACC065
CATIII (1000V)-Test Lead ACC064SP
CATIII (300V)-Test Lead Model7228

Protection degree IEC 60529 (1989 + A1) IP40
EMC EN 61326

EN55022/24

Specification

This manual and product may use the foll
a

dopted from International Safety Standards;

CAT.III Measurement category CAT III applies to;

Primary electrical circuits of the equipment connected directly
to the distribution panel, and feeders from the distribution
panel to outlets.








Equipment protected throughout by DOUBLE INSULATION or
REINFORCED INSULATION;

Caution (refer to accompanying documents)

Caution, risk of electric shock

Protection against wrong connection is up to 500V

Earth Ground

owing symbols

15

Specification

5.5 List of Display Message

Low battery warning

Tem p erat u re moni t o r f o r in t e r nal resistan c e ,
available at Loop, PSC/PFC & RCD function. Further

measurements are suspended until the 
disappears.

Measuring Measurements in progress

Live Circuit Live circuit warning (Continuity / Insulation Function)

PE Hi V

L-N >20Ω

Noise

N - PE Hi V

Uc > UL

no

Caution : Presence of 100V or more at PE terminal,
appears when touching the Touch Pad

Alert : Presence of 20Ω or more between Line ­Neutral at ATT measurement

Caution : Presence of noise in the circuit under test
during ATT measurement. ATT function should be

isabled to continue measurements.

d

Caution: Presence of high voltage between NEUTRAL

- EARTH during ATT measurement. ATT function
should be disabled to continue measurements.

Caution : Uc at RCD measurement is exceeding the
preset UL value (25 or 50V).

Error message : When on the RCD function, RCD
tripped before measuring RCD trip time. Selected
IΔn value may not be correct.

on the LOOP, PSC/PFC function, supply may

When
have been interrupted.

 symbol

OK

NO

×

Hi, RS Hi

R

H

No 3-phase system

Wiring check for LOOP, PSC/PFC function

Appears when all results passed during the RCD Auto
Test function.

Appears when any results failed during the RCD Auto
Test function.

Appears when a Probe resistance of H terminal
(RH) or of S terminal (RS) at Earth measurement is
exceeded the measurable range.

Appears to indicate wrong connection at Phase
Rotation check.

16

Setting for following three parameters

1. Press the Config Button
(F4) when powering on
KT65. (Fig.9)

2. Then, Configuration
Screen (Fig.10) is
displayed.

KT65

TESTER

MULTI FUNCTION

Config

Push

Touch Pad :

UL :

OFF

Configuration

Back Light :

ON

50V

ESC

▲ UL value････････Selects a UL value for RCD function
▲ Touch Pad･･････Enables / disables Touch Pad function
▲ Back Light･･････Selects Backlight ON / OFF. When ON is selected, the

Backlight automatically turns on at powering on the instrument.

Setting method

Fig. 9 Fig. 10

6 Configuration

3. Press the F1 – F3 Button to change following setting.

Parameter Selection Initial value

F1 UL value 25V, 50V 50V

F2 Touch Pad ON, OFF ON

F3 Back Light ON, OFF OFF

4. Press the ESC Button (F4) when setting change is completed, and return to
the normal screen.

17

7 Continuity

NULL OFF

PAT OFF

ON

Ω

Brown
(Red)

Green

Warning: Ensure that circuits to be tested are not live.

Disconnect the instrument from the circuit under test before operating
the function switch.
To select the low resistance range select CONTINUITY.

7.1 Test Procedure

The object of continuity testing is to measure only the resistance of the parts
of the wiring system under test. This measurement should not include the

s u

resistance of any test lead

sed. The resistance of the test leads needs to
be subtracted from any continuity measurement. The KT65DL is provided with
a continuity null feature which allows automatic compensation for any test

lead resistance.

You should only use the test leads supplied with the instrument.

Operation of Function Switch

F1 Switches on / off NULL function

F2 Switches on / off 2Ω buzzer

PAT mode setting.

F3

(PAT OFF, CL1 0.1Ω, CL1 0.3Ω)

Fig. 11

F4 N/A

Proceed as follows:­1 Select the continuity test by rotating the Rotary switch.
2 Press F3 switch to select PAT mode setting.
3 Insert the Test Leads to the L and PE terminal on KT65DL respectively as

shown in Fig.12.

L terminal
Brown cord of ACC065, or
ACC064SP Remote Test Lead

PE terminal
Green cord of ACC065

Fig. 12

4 Connect the ends of the test leads firmly together (see Fig.13) and press

and lock down the test button. The value of the lead resistance will be
displayed.

18

NULL

ON

Ω

Measuring

NULL

ON

Ω

Measuring

PAT OFF

Fig. 13

5 Press the Continuity Null (F1) button, this will null out the lead resistance and

the indicated reading should go to zero.

6 Release the test button. Press the test button and ensure the display reads

zero before proceeding. While using the Continuity null function, NULL

is displayed on the LCD as indicated in Fig.13. The null value will be stored

even if the instrument is powered off. This memorised null value can be
cancelled by disconnecting the test leads and pushing the Continuity Null
button (F1) with the test button pressed or locked. When this is cancelled
you will know because NULL OFF is displayed on the LCD.

CAUTION - before taking any measurements

always check the leads have

been zeroed.

7 Connect the test leads to the circuit whose resistance is required (see

Fig.14 for a typical connection arrangement), having first made sure that
the circuit is not live. Note that Live Circuit warning will be displayed on
the LCD if the circuit is live - but check first anyway!

8 Press the test button and read the circuit resistance from the display. Th

re

ading will have the test lead resistance already subtracted if the Continuity

null function has been used.

9 Note that if the circuit resistance is greater than 20Ω the instrument will

autorange to the 200Ω, if it is greater than 200Ω it will autorange to the
2000Ω range.

Note: If the reading is greater than 2000Ω the overange symbol >
will remain displayed.

The results of measurements can be

adversely affected by impedances of

additional operating circuits connected in parallel or by transient currents.

Continuity



e