Megger MIT1020/2 Bedienungsanleitung

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MIT1020/2

10kV Digital Insulation Tester

USER MANUAL

GSAFETY WARNINGS

Safety Warning must be observed during use.

nThe circuit under test must be switched off, de-energised, isolated and checked to be safe before insulation test connections are made. Make sure the

circuit is not re-energised whilst the instrument is connected.

nCircuit connections must not be touched during an insulation test.

nAfter completing a test, capacitive circuits must be completely discharged before disconnecting the test leads. Capacitive charges can be lethal.

nTested items should be firmly shorted out with a shorting link, after discharge, until required for use. This is to guard against any stored dielectric

absorption charge subsequently being released thereby raising the voltage to potentially dangerous levels.

nThe voltage indicator and automatic discharge features should be regarded as additional safety features and not a substitute for normal safe working

practice.

nIt is rare, but in certain circumstances, breakdown of the circuit under test may cause the instrument to terminate the test in an uncontrolled manner,

possibly causing a loss of display while the circuit remains energised. In this event, the unit must be turned off and the circuit discharged manually.

nTest leads, including crocodile clips, must be in good order, clean and with no broken or cracked insulation.

nThe instrument should not be used if any part of it is damaged.

nInsulation testing in wet weather conditions might be hazardous. It is recommeded that this instrument is not used in these circumstances. If this

unavoidable, the user must take all necessary precautions.

nThis instrument is not intrinsically safe and must not be used in hazardous atmospheres.

nIf this instrument is used in a manner not specified by the manufacturer, the protection provided by the equipment may be impaired.

NOTE

THE INSTRUMENT MUST ONLY BE USED BY SUITABLY TRAINED AND COMPETENT PERSONS.

Users of this equipment and/or their employers are reminded that National Health and Safety Legislation requires 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 inadvertent short circuits. Where the assessments

show that the risk is significant then the use of fused test leads may be appropriate.

Test mode summary 16

Insulation resistance ‘IR’ test 16

Breakdown mode / burn mode 16

Alarm limit mode 16

Step voltage ‘SV’ test 17

Polarisation index ‘PI’ test, and dielectric absorption

ratio ‘DAR’ test 17

Dielectric discharge ‘DD’ test 17

Measurements above 100 GΩ18

Circuit block diagram 19

Specifications 20

Accessories 21

Repair and warranty 22

Battery replacement 22

Symbols used on the instrument are:

F Caution: risk of electric shock

G Caution: refer to accompanying notes

t Equipment protected throughout by Double

Insulation (Class II)

c Equipment complies with current EU directives.

This equipment should be recyled as electronic

waste.

Terms used in this manual

The word must is used to indicate that the instructions following should

be followed under all circumstances. Failure to follow these instructions

could result in damage to the instrument and / or a hazard to the operator.

The word should is used to indicate that the instructions indicate best

practice.

CONTENTS

Safety warnings 2

Introduction 4

General description 4

Features 4

Cleaning 4

Power lead and battery charging 5

Instrument controls and indicators 6

Power On/Off button 7

Test voltage sand tbuttons 7

Test start / stop button 7

Ω/I button 7

Bbutton 10

Fn button 10

Mode button 10

Timer sand tbuttons 11

Record button 11

Recording to on-board memory 11

Downloading results 11

Deleting results 11

Recording to a PC 11

High voltage warning LED 12

Line input present LED 12

Test terminals 12

Guard terminal 12

RS232 / USB connections 12

Battery bar graph 13

Voltage at terminals 13

Timer indicator 13

Digital display 13

Analogue display 14

Secondary display 14

Pre-Test / during test key action table 14

Breakdown detection 15

Noise detection 15

Features

nContinuous resistance or current measurement on main display.

nOptional resistance, current, or figure of merit measurements on

secondary display.

nStandard test voltages – 250 V, 500 V, 1 kV, 2.5 kV, 5 kV, 10 kV

nNon-standard test voltages – selectable between 50 V and 1 kV in 10 V

steps, and selectable between 1 kV and 10 kV in 25 V steps.

nTest modes include insulation resistance, polarisation index, step

voltage and dielectric discharge.

nThe dielectric absorption ratio is automatically calculated if the

corresponding timers are set.

nEither burn or breakdown selectable in insulation resistance mode.

nInsulation ‘Alarm Limit’ available in insulation resistance mode.

nProgrammable timers include a main test duration timer, plus T1 and

T2 timers for time resistance method type tests.

nLoad capacitance and time constant measurements – displayed at end

of test.

nLCD backlight.

nData storage, data retrieval and real time data output.

nUSB or RS232 communications.

nBattery level / charge level indicator.

Cleaning

Disconnect the instrument and wipe it with a clean cloth slightly damped

with soapy water or Isopropyl alcohol (IPA).

INTRODUCTION

General Description

The MIT1020/2 is a microprocessor controlled 10 kV insulation tester

offering measurement capability of up to 35 TΩ. The instrument performs

automatic tests and has data storage and data retrieval facilities.

Polarization index and dielectric discharge tests are performed

automatically, and test duration and voltages can be adjusted according

to user preference for these tests. A step voltage test can be performed

automatically, with a default voltage of 1 kV, and test duration of 5

minutes. It is possible for the user to set different voltages and test

durations for the step voltage test.

The MIT1020/2 can be powered from the mains supply or by its own

internal rechargeable battery, which provides for at least 4 hours of

continuous testing with a 100 MΩload. A battery level indicator on the

LCD display indicates battery capacity. Connecting power to the mains

supply connector will automatically charge the battery whether the

instrument is switched ‘on’ or ‘off’, except during testing. A high level

of internal isolation allows the instrument to be used while the unit is

supplied from the mains. An internal battery management system switches

the instrument off after ten minutes of inactivity. If the battery approaches

a very low state of charge the instrument turns itself off, and mains power

must be applied before the instrument can be used again. Recorded test

results and settings will not be lost when the instrument is switched off.

A comprehensive LCD display shows resistance, current, capacitance, time

constant, voltage, timer measurements, and figure of merit measurements

such as polarisation index.

POWER LEAD AND BATTERY CHARGING

If the power lead supplied is not suitable for your mains connection, do

not use an adaptor. Always use a power lead fitted with the correct plug.

The instrument is fitted with a two-pin IEC60320 power inlet. Most power

leads are made with three-core cable, so the ground connection will not

be used.

Power lead connection table

Connection UK/International USA

Earth/Ground Yellow/Green Green

Neutral Blue White

Live (Line) Brown Black

If using a fused plug, ensure that it is fitted with a 3 Amp fuse.

The instrument can be powered from 85 - 265 Vrms a.c. at 50/60 Hz. The

battery will charge as long as the mains supply is connected, except when

a test is in progress. The power On/Off button has a green LED, which

illuminates when mains power is present. For optimum battery life, charge

the battery after each use. A completely exhausted battery will take 14

hours to recharge.

INSTRUMENT CONTROLS AND INDICATORS

Measurement terminals

-ve guard +ve

RS232

USB

Line

input

Time s and

t selectors

Voltage s

t selectors Line input

Present

indicator

Power on/off

Ω/I selector

Burn indicator Alarm Data recording

Test modes

Voltage at

terminals

Battery level

Breakdown

indicator

High voltage

warning

indicator

High

voltage

warning

indicator

Analogue

display

Timers

Main, T1,

Dielectric

absorption

ratio/T1 timer

Digital

display

Polarisation

index/timer T2

Time

constant

Capacitance

display

Data record

High voltage

warning indicator

Test start/stop

ModeFunction

Backlight

on/off

When the test has stopped, the display continues to show the voltage

present on the test leads. Pressing either test voltage sor tbutton will

then display the test voltage immediately before the end of the test.

Test start / stop button

A test will only start if this button is pressed, held and then released as

soon as the red high voltage warning indicator LED lights. The LCD and

red LED high voltage warning indicators flash when the test starts.

A test will not start if the button is released before the red LED shows, or

pressed continuously for longer than 5 seconds. This is a safety feature to

prevent a test being started inadvertently.

The presence of a voltage greater than 50 V on the test leads is indicated

with flashing high voltage warning indicators. Testing is disabled if the

external voltage exceeds 80 V.

Testing will stop if the test start / stop button is pressed again, the

preset test time is reached, or, if the unit is not in burn mode, insulation

breakdown is detected.

When a test has finished, the instrument will discharge the load, which

may take some time. The operator must always check the load has been

discharged before touching the test leads.

Ω/I button

Pressing this button toggles the digital and secondary displays. The details

available when scrolling the secondary display will depend upon the test

mode selected, whether timers T1 and T2 have been set, and the duration

of the test. The digital display toggles between insulation resistance and

current.

Power On/Off button

The instrument will only turn on if this button is pressed, held and then

released when the display responds. The instrument will not turn on if

the button is released before the display responds, or if the button is held

down for too long. This is a safety feature to prevent the instrument being

inadvertently turned on.

The instrument is turned off either by pressing the button again, or if the

instrument is running on the battery, by timing out after 10 minutes of

inactivity.

Upon switching the instrument on the display will first show ‘Ini’ while it

undergoes a self-checking routine. When Ini disappears, the instrument is

ready for use.

Test voltage sand tbuttons

Using these buttons one of six test voltages can be selected: 250 V, 500 V,

1 kV, 2.5 kV, 5 kV, and 10 kV. The selected voltage is shown on the display.

A non standard voltage between 50 V and 10 kV can be selected by holding

down the ‘Fn’ function button whilst operating the buttons. The selectable

voltage is adjustable in 10 V steps between 50 V and 1 kV, and adjustable in

25 V steps between 1 kV and 10 kV. An auto repeat facility is enabled when

the button is held down, allowing faster travel through the range.

If there is an external voltage greater than 50 V on the test leads, the high

voltage warning indicators are flashed, and the display shows this voltage

instead. The instrument will not perform a test if this voltage is greater than

80 V.

During a test the display shows the actual voltage on the test leads. If the

test voltage is changed during a test, the new test voltage will be displayed

briefly.

Figure 1 - The result of an insulation resistance test (IR)

Test settings: T1 and T2 times set in order to measure the DAR

Test conditions: test runs for longer than 10 minutes as this is required for

a PI reading.

In the ‘IR’, ‘PI’, and ‘DD’ modes the secondary display initially shows the

PI (polarity index), DAR (dielectric absorption ratio), and, on completion

of the test, the TC (time constant) and capacitance measurements.

Toggling the display shows insulation resistances and currents.

In the ‘SV’ (step voltage) mode, the secondary display toggles between

insulation resistances and currents.

Figures 1 to 4 illustrate the display status for sequential ‘Ω/I’ key presses in

the different modes. Press Ω/I

Press Ω/I

Figure 3 - The result of a dielectric discharge test (DD)

Test settings: T1 and T2 times set in order to measure the DAR

Test condition: test runs for longer than 10 minutes as this is required for

a PI reading.

Figure 2 - The result of a polarity index test (PI)

Test settings: T1 and T2 times set in order to measure the DAR

Test conditions: timer defaults to 10 minutes, as this is required for a PI

reading

Press Ω/I

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