Kewtech KT45 Manuale utente

KEWTECH

KT45 digital LOOP PSC tester with

Instruction manual

Contents

1 Safety Notice 1

2 Features 3

3Principles of measurement 10

4Operating instructions 16

5 General 21

6Battery Replacement 22

7Servicing & Calibration 23

The KT45 incorporates Anti Trip Technology (ATT) which

electronically by-passes most RCDs at Distribution

Boards. This saves time and money by not having to take

the RCD out of circuit during testing and is a safer

procedure to follow.

With the ATT function, a test current of 15mA or less is

applied between line - earth. It enables LOOP

measurement without tripping most RCDs.

If there is doubt as to whether this tester will by-pass a

particular RCD, contact Kewtech with details of

manufacturer, model no., rating and sensitivity.

Pleasereadthisinstructionmanualcarefullybeforeusing

thisinstrument.

1 Safety Notice

Electricity can cause severe injuries even with low voltages

or currents. Therefore it is extremely important that you

read the following information before using this Tester.

1.1 This instrument must only be used by a competent trained

person and in strict accordance with the instructions.

Kewtech will not accept liability for any damage or injury

caused by misuse or non-compliance with instructions or

safety procedures.

1.2 This instrument is only intended for single phase operation,

230V AC+10%-15% phase to earth or phase to neutral

operation. Although fully protected (no bangs), it must never

be connected phase to phase (400 VAC).

1.3 When conducting a test, particularly on earth spikes, do not

touch any exposed metal work. This is because the earth has

a current flowing through it for the duration of the test.

1.4 Never open the instrument case (except for battery

replacement and in this case disconnect all leads first)- there

are dangerous voltages present. Only trained, competent

Electronic engineers should open the case. Send the unit to

Kewtech, if a fault develops.

1.5 This instrument is primarily protected by HRC Ceramic

fuses. Do not attempt to replace them if they fail. If they do,

contact Kewtech.

1.6 If the overheat symbol appears in the display, disconnect the

instrument from the mains and allow to cool down.

1.7 When testing, always be sure to keep your fingers behind

the safety barriers on the test leads.

1.8 Always inspect your Instrument and test leads before use for

any sign of abnormality or damage. If any abnormal

conditions exist (broken test leads, cracked case, display

faulty, inconsistent readings, etc) do not attempt to take any

measurements. Return to Kewtech for repair.

1.9 This meter has been designed with your safety in mind.

However, no design can completely protect against

incorrect use. Electrical circuits can be dangerous and/or

lethal when a lack of caution or poor safety practice is used.

Use caution in the presence of voltages above 33V as these

pose a shock hazard.

1.10 Pay attention to cautions and warnings which will inform

you of potentially dangerous procedures.

1.11 Never assume an installation circuit is not live. Confirm it is

de-energized before commencing testing using a suitable

tester.

1.12 Replace worn and/or damaged leads with new ones

approved by Kewtech immediately. Only use accessories

recommended by Kewtech as they are designed to work

with the tester. The use of any other items is prohibited as

they may not have the same safety features built in, and may

degrade performance.

1.13 Users of this equipment and/or their employers are

reminded that Health and Safety Legislation require them to

carry out valid risk assessments of all electrical work so as

to identify potential sources of electrical danger and risk of

electrical injury such as from inadvertent short circuits.

Where the assessments show that the risk is significant then

the use of fused test leads constructed in accordance with

HSE guidance note GS38 Electrical test Equipment for use

by Electricians should be used.

2 Features

2-1 Instrument layout

1......LCD

2......Power Switch

3......Test Button

4......Function / Range Switch

5......Wiring Check LEDs

LED indication of correct polarity is that the P-E and P-N LEDs

are lit. P and N are reversed when the reverse LED is lit.

6......Noise override Switch

LCD display

Fig 1

Fig 2

2-2 Accessories

▲KAMP11UK mains test lead with IEC Connector

▲ACC016E Distribution board fused test lead

(Fuse: 10A/600V fast acting ceramic)

▲Test lead carry pouch

forhandsfree

Black

neutral

Red

KAMP11UK

ACC016E

phase

Green

earth

Fig 3

2-3 Features

▲ATT In the ATT mode, LOOP

(Anti Trip Technology) measurement can be done without

tripping RCDs rated at 30mA or more.

▲Wiring Check Three LEDs indicate if the wiring of

the circuit under test is correct.

▲Over temperature Detects overheating of the internal

protection resistor displaying a warning symbol

()and automatically halting

further measurements.

▲Main Voltage When connecting Test Lead to circuit,

Indication voltage between L- PE is displayed. If

the voltage is lower than 100V,

displayed as "V L- PE Lo". If the

voltage is between 260V and 300V,

voltage and "V L- PE Hi" is displayed

alternately. When the voltage is 300V

or more, "V L- PE Hi" is displayed.

▲Low battery warning " "symbol appears in the display if

the battery voltage drops below

8V(ATT 9.2V).

▲Auto power off Automatically switches the instrument

off after approximately 10 minutes.

2-4 Measurement specification

Loop impedance

Prospective Short-circuit Current

(*1): If the impedance between L-N is 20Ωor more, "no" is

displayed on the LCD and no measurement can be made. In this

case, disables ATT function and make measurement.

Measuring Nominal test current at Intrinsic

Range range 0Ωexternal loop: accuracy

Magnitude/Duration

20Ω0.00-19.99Ω25A/10ms

200Ω0.0-199.9Ω2.3A/20ms ±(3%rdg+4dgt)

2000Ω0-1999Ω15mA/360ms

20Ω0.00-19.99Ω

(ATT) (*1)L-N<20ΩP-N:25A/30ms ±(3%rdg+6dgt)

200Ω0.0-199.9ΩN-E:11mA/approx. 2s

(ATT) (*1)L-N<20Ω

Measuring Nominal test current at Intrinsic

Range range 0Ωexternal loop: accuracy

Magnitude/Duration

200A 0.0-199.9A 2.3A/20ms

2000A 0-1999A 25A/10ms

20kA 0.00-1.99kA 25A/10ms

200A 0.0-199.9A

(ATT) (*1)L-N<20Ω

2000A 0.0-1999A P-N:25A/30ms

(ATT) (*1)L-N<20ΩN-E:11mA/approx. 2s

20kA 0.00-1.99kA

(ATT) (*1)L-N<20Ω

PSC accuracy is

derived from the

loop impedance

accuracy

PSC(ATT)

accuracy is

derived from the

loop (ATT)

impedance

accuracy

Measuring range Intrinsic accuracy

100-300V (*2): ±(2%rdg+4dgt)

Voltage

(*2): The voltage and "V L- PE Hi" is displayed on the LCD

alternately when the voltage is 260V or more and under 300V.

2.5 Reference conditions

Ambient temperature: 23±5℃

Relative humidity: 60±15%

Nominal system voltage 230V, 50Hz

and frequency:

Altitude: Less than 2000m

2-6 Operating error

Loop impedance(IEC61557-3)

The influencing variations used for calculating the Operating

error are:

2.7 General specification

Operating 0 to 40℃,relative humidity

temperature and 85%or less, no condensation.

humidity.

Storage -20 to+60℃,relative humidity

temperature and 85%or less, no condensation.

humidity.

Battery type Eight AA R6 or LR6 batteries

Measurement times: approx 1500 times or more.

(ATT 500 times or more.)

Dimensions: 175 x 115 x 85.7mm

Weight: 810g

Maximum altitude: 2000m

Over range indication: 'OL'

Range Operating range compliant

with EN61557-3 operating error

20Ω0.35 to 19.99Ω

200Ω20.0 to 199.9Ω

2000Ω200 to 1999Ω

Ambient temperature: 0゜and 35℃

Phase angle: 0゜to 18℃

System frequency: 49.5Hz to 50.5Hz

System voltage: 195V to 253V

Supply voltage: 8V to 13.8V

Indice

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