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Kewtech KT64 Скачать руководство пользователя страница 24

21

4

If the Live Circuit warning will be displayed on the LCD and/or the buzzer

sounds,

do not press the test button

but disconnect the instrument from

the circuit. Make the circuit dead before proceeding.

5

Press the test button, the display will show the insulation resistance of the

circuit or the appliance to which the instrument is connected.

6

Note that if the circuit resistance is greater than

20

M

Ω

, the instrument will

autorange to the

200

M

Ω

range. If it is greater than

200

M

Ω

at the

500

V

or

1000

V range, it will autorange to the

2000

M

Ω

range.

7

When testing is complete release the test button before disconnecting

the test leads from the circuit or from the appliance. This will ensure that
the charge built up by the circuit or the appliance during insulation test
is dissipated in the discharge circuit. In the discharging process, Live
Circuit warning will be displayed on the LCD and the live circuit warning
buzzer will sound.

Fig.

17

Fig.

18

Insulation

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Содержание KT64

Страница 1: ......

Страница 2: ...Damage to voltage sensitive equipment 19 8 3 Preparation for measurement 19 8 4 Insulation resistance measurement 20 9 LOOP PSC PFC test 22 9 1 Principles of Measurement of fault loop impedance and PF...

Страница 3: ...ey 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 loop...

Страница 4: ...may become live for the duration of the test 5 Never open the instrument case except for fuse and battery replacement and in this case disconnect all leads first because dangerous voltages are present...

Страница 5: ...uit before moving the selector switch 13 Do not rotate rotary switch when test button is depressed If the function switch is inadvertently moved to a new function when the test button is depressed or...

Страница 6: ...te for lock down feature 3 Touch Pad Checks the electrical potential at the PE terminal 4 Power Switch Power Switch 5 Function Switch Function setting F1 F4 6 Display LCD Dot Matrix LCD 160 W X240 H 7...

Страница 7: ...cting ceramic Test Lead Carry pouch Carrying Bag The KT64 Multi Function tester performs six functions in one instrument 1 Continuity tester 2 Insulation resistance tester 3 Loop impedance tester 4 Pr...

Страница 8: ...nce PSC PFC and RCD testing functions have the following features Wiring check Three Wiring symbols indicate if the wiring of the circuit under test is correct Over temperature protection Detects over...

Страница 9: ...inuity Open Circuit Voltage DC Short Circuit Current Range Accuracy 5V 20 Greater than 200mA 20 200 2000 Auto Ranging 0 0 19 0 1 0 2 2000 2 rdg 8dgt 2 Buzzer Buzzer sounds when measured resistance is...

Страница 10: ...gt 3 L N L L 50 60Hz L N 100 300V L L 300 500V 20 6A 20ms 20 3 rdg 4dgt 2 3 rdg 8dgt 3 1 at 230V 2 230V 10 15 3 voltages except for 2 PSC L N L L PFC L PE Function Rated Voltage Nominal Test Current a...

Страница 11: ...tion ms X1 2 G AC 2000 2000 2000 2000 2000 2000 A 2000 2000 2000 2000 2000 n a S AC 2000 2000 2000 2000 2000 n a A 2000 2000 2000 2000 2000 n a X1 G AC 550 550 550 550 550 550 A 550 550 550 550 550 n...

Страница 12: ...e denoted as follows Temperature 0 and 35 Supply voltage 8V to 13 8V Insulation Resistance EN61557 2 Volt Operating range compliant with EN61557 2 operating error Maximum percentage operating error 25...

Страница 13: ...3 General speci cation Instrument dimensions 235 X 136 X 114mm Instrument weight 1300g including batteries Reference conditions Specifications are based on the following conditions except where other...

Страница 14: ...2001 CATII 250V Test Lead KAMP12 CATIII 600V Test Lead ACC064 CATIII 1000V Test Lead ACC064SP Protection degree IEC 60529 1989 A1 IP40 EMC EN 61326 EN 55022 EN 61000 4 2 performance criterion C EN 61...

Страница 15: ...easurement ATT function should be disabled to continue measurements N PE Hi V Caution Presence of high voltage between NEUTRAL EARTH during ATT measurement ATT function should be disabled to continue...

Страница 16: ...instrument Setting method 1 Press the Con g Button F4 when powering on KT64 Fig 6 2 Then Con guration Screen Fig 7 is displayed 3 Press either F1 or F2 or F3 for setting change on UL value or Touch P...

Страница 17: ...ovided 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 S...

Страница 18: ...have been zeroed 6 Connect the test leads to the circuit whose resistance is required see Fig 11 for a typical connection arrangement having rst made sure that the circuit is not live Note that Live...

Страница 19: ...e of insulation resistance Live conductors are separated from each other and from earth metal by insulation which has a resistance which is high enough to ensure that the current between conductors an...

Страница 20: ...ved from the system at the end of the test a function which is automatically performed by the KT64 If an alternating voltage is applied between the conductors the system continuously charges and disch...

Страница 21: ...is the sum of the capacitive conduction and surface leakage current described above Each of the currents and hence the total leakage current is affected by factors such as ambient temperature conduct...

Страница 22: ...d items of equipment are being connected to electrical installations The solid state circuits in such equipment are likely to be damaged by the application of the levels of voltage used to test insula...

Страница 23: ...he KT64 has three selectable test voltages of 250V 500V and 1000V DC 1 Select INSULATION function with the Rotary switch 2 Press the VOLT Switch F4 and select desirable voltage range 3 Insert the Test...

Страница 24: ...tance is greater than 20M the instrument will autorange to the 200M range If it is greater than 200M at the 500V or 1000V range it will autorange to the 2000M range 7 When testing is complete release...

Страница 25: ...rent high enough to allow automatic disconnection of the electrical supply by the circuit protection device within a prescribed time interval Every circuit must be tested to ensure that the earth faul...

Страница 26: ...ted line the Fault loop impedance for TN systems In accordance with the international standard IEC 60364 for a TT system the following condition shall be ful lled for each circuit RA must be 50 Ia whe...

Страница 27: ...1667 the loop tester reads 12 74 and consequently the condition RA 50 Ia is met It is also important to test the operation of the RCD using the RCD function in accordance with BS7671 The following co...

Страница 28: ...be Rating Disconnecting Time 5s Disconnecting Time 0 4s A Ia A Zs Ia A Zs 6 28 8 20 47 4 90 10 46 5 00 82 2 80 16 65 3 60 110 2 10 20 85 2 70 147 1 56 25 110 2 10 183 1 25 32 150 1 53 275 0 83 40 190...

Страница 29: ...ult current at any point within an electrical installation is the current that would ow in the circuit if no circuit protection operated and a complete very low impedance short circuit occurred The va...

Страница 30: ...27 Fig 24 Connection for Line Neutral measurement Fig 25 Connection for Line Neutral measurement using an outlet Fig 26 Connection for Line Line measurement LOOP PSC PFC...

Страница 31: ...F2 ATT setting on or off F3 N A F4 N A PSC PFC F1 Switches measurement mode PFC or PSC F2 ATT setting on or off F3 N A F4 N A 1 Operate the Power button and turn on the instrument Turn the Function s...

Страница 32: ...played on the LCD it is recommended to disable the ATT mode and take a measurement RCDs may trip If an impedance of 20 or more is measured between L N during measurements with ATT enabled L N 20 is di...

Страница 33: ...tween Line PE Carry out the initial checks Press the test button A beep will sound as the test is conducted and the value of loop impedance will be displayed If the display shows then this usually mea...

Страница 34: ...allation In the case where the current difference is higher than the RCD tripping current the device will trip and disconnect the supply from the load There are two parameters for RCDs the rst due to...

Страница 35: ...sted in the table below for I n and 5I n Type of RCD I n 5I n General G 300ms max allowed value 40ms max allowed value Selective S 500ms max allowed value 150ms max allowed value 130ms min allowed val...

Страница 36: ...otary switch and select the RCD function 2 Press the MODE switch F1 and select any desirable measurement mode X1 2 For testing RCD s to verify that they are not too sensitive X1 For measuring the trip...

Страница 37: ...it will display the line earth voltage which is updated every 1s If this voltage is not normal or as expected DO NOT PROCEED NOTE This is a single phase 230V AC instrument and under no circumstances...

Страница 38: ...tting is greater than the rated residual current of the RCD the RCD will trip and no may be displayed on LCD If a voltage exists between the protective conductor and earth it may in uence the measurem...

Страница 39: ...not appear and the buzzer does not sound Initial value ON Pressing the Back Light Button selects Backlight ON OFF Backlight automatically turns off in 30 sec after it turns on Backlight at powering o...

Страница 40: ...attery cover The continuity test circuit is protected by a 600V 0 5A HRC ceramic type fuse situated in the battery compartment together with a spare If the instrument fails to operate in the continuit...

Страница 41: ...of the instrument It directly affects the accuracy of the loop and PSC PFC readings As such always keep it with the instrument and remember to return it with the instrument when servicing and calibrat...

Страница 42: ...to install the Strap belt 3 How to fasten the Strap belt Match the hole of the Buckle and the protrusion at the side face of KT64 and slide it upwards Pass the strap belt down through the buckle from...

Страница 43: ...Kewtech Corporation Ltd Midas House Unit 2b Stones Courtyard High Street Chesham Buckinghamshire HP5 IDE www kewtechcorp com 40...

Страница 44: ...92 1885A 06 11...

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