Megger MIT300 Manuale utente

MIT300 Series

Insulation and Continuity Testers

USER MANUAL

GSAFETY WARNINGS

nSafety Warnings and Precautions must be read and understood before the instrument is used. They must be observed during use.

nThe circuit under test must be switched off, de-energised and isolated before test connections are made when carrying out insulation and continuity

tests.

nCircuit connections and exposed metalwork of an installation or equipment under test must not be touched.

nThe live circuit warning and automatic discharge are additional safety features which may fail and therefore safe working practices must be

observed.

nThe voltage function will only work if the instrument is functional and switched on.

nAfter insulation tests, capacitive circuits must be allowed to discharge before disconnecting test leads.

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

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

nEnsure that hands remain behind guards of probes/clips when testing.

nNational Safety Authorities may recommend the use of fused test leads when measuring voltage on high-energy systems.

nReplacement fuses must be of the correct type and rating. Failure to fit the correctly rated fuse may result in a safety hazard and may cause damage to

the instrument in the event of an overload.

nThe battery cover must be in place whilst conducting tests.

n The MIT310A is designed for use only in a controlled electromagnetic environment.

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.

NOTE

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

CAT II - Measurement category II: Equipment

connected between the electrical outlets and the

user’s equipment.

CAT III- Measurement category III: Equipment

connected between the distribution panel and

the electrical outlets.

CAT IV - Measurement category IV: Equipment

connected between the origin of the low-voltage

mains supply and the distribution panel.

Insulation testing 15

Test lock 15

SP4F Switched (optional accessory for MIT320) 16

Test result storage (MIT330 only) 16

Replacing batteries and fuses 18

Low battery warning symbol 18

To replace batteries 18

Fuse replacement (user replaceable) 19

Preventive maintenance 19

Technical specification 20

Accessories and equipment 23

Repair and Warranty 24

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.

Equipment complies with ‘C tick’ requirements

CONTENTS

Safety warnings 4

Introduction 2

General description 4

Case contents 5

LCD display 6

Front panel (digital instruments) 6

Connection panel 7

Lid open/closure 7

Preparations for use (all instruments) 8

Batteries 8

Preliminary test lead check 8

General operating instructions 8

General functions 8

Test lead connection. 9

Continuity measurement (MIT300, 310, 320, 330) 10

Test lead null 10

Continuity test (MIT300, 310,320, 330) 10

Continuity Buzzer (MIT300, 310, 320, 300) 11

Continuity buzzer mode: 11

Setup mode (MIT320/330 only) 11

Insulation testing - General 12

Insulation test 12

Test lock 13

Insulation test (MΩ alarm ON/OFF (MIT320 only) 13

MΩ threshold adjustment (MIT320/330 only) 13

Insulation test lock disable (MIT320/330 only) 13

AC / DC Voltage measurement 14

Analogue Instrument MIT310A 14

Test lead null 14

Continuity test 15

Continuity buzzer test 15

The MIT300 series variants have the following features:

MIT300 MIT310 MIT310A MIT320 MIT330

Insulation testing

1 kV Insulation range nnn n

500 V Insulation range nnnn n

250 V Insulation range nnnn n

Insulation test full scale 999 MΩ 999 MΩ 999 MΩ 999 MΩ 999 MΩ

Insulation limit alarm

0.01 MΩ to 1 GΩ n n

Continuity

Voltmeter range

(600 V digit) nnn n

Continuity buzzer nnnn n

Adjustable buzzer

threshold 1 Ω to 20 Ω nn

Audible buzzer disable nn

Lead null to 9.0 Ω

(0.5 Ω for MIT310A) nn0.5Ω nn

Stored test lead null nnnn n

Resistance

10 Ω to 1M Ω resistance

range nn

INTRODUCTION GENERAL DESCRIPTION

Thank you for purchasing the Megger Insulation Tester.

For your own safety and to get the maximum benefit from your

instrument, please ensure that you read and understand the following

safety warnings and instructions before attempting to use the

instruments.

This user guide describes the operation and functions of the following:

MIT300 Series of insulation and continuity testers:

MIT300

MIT310

MIT310A

MIT320

MIT330

Please complete the warranty card and return it to Megger Limited as

soon as possible to help us reduce any delays in supporting you, should

the need arise.

Case contents

1 x MIT300 series insulation tester

1 x Red/Black test lead set with clips

8 x AA (LR6) batteries fitted

1 x Warranty card

1 x Certificate of test

1 x Calibration certificate

1 x CD containing user manual

1 x Printed quick start guide

1 x USB lead (MIT330 only)

1 x SP4F switched probe (MIT320 and MIT330 only)

CASE CONTENTS

MIT300 MIT310 MIT310A MIT320 MIT330

Features

Locking test button nnnn n

Backlight and rotary

switch illuminations nn

Voltage warning n

Default voltmeter nnn n

Auto-power-down with

defeat nnnn

Switched test probe

connector nn

Switched test probe nn

Results storage n

Downloading n

USB n

LCD DISPLAY FRONT PANEL (DIGITAL INSTRUMENTS)

MIT300, 310, 320 and 330

MIT310A

Voltage warning LED

Test Lock LED

Test lead null

Battery check

Battery condition

indication

Moving coil

Analogue

display

indication

Test lead

connections

Insulation test

ranges

LCD Display

Test lock

Measurment

ranges

Analogue

pointer

Battery

condition

indicator

Warning - refer

to user guide

Multi-fuction

analogue

range display

Fuse blown

indicator

Continuity

indicator

Test lock

warning

Infinity

symbol

Lead null

indicator Digital range

Test button &

test lead null

Back light On/Off

(MIT320 & MIT330

only)

Continuity buzzer

and Resistance

range (MIT320 &

MIT300)

Voltage

range

Neck strap

slots

Range knob

Setup menu

(MIT320 & 330)

Front panel cover

(folded under

instrument)

Memory control keys:

STORE: Store initiates the storing of a test result.

LAST/NEXT: Selects the type of location; ie Job, distribution

board, circuit, phase etc.

ESC: Aborts a save at any time.

OK: Final operation to save the result.

sSelects the job, db, circuit number; ie 01,02,03 etc

Lid open/closure

1. Open lid by lifting up front panel tab (1).

2. Fold-away underneath instrument (2 & 3) and push into retaining slot

(4).

Connection Panel

MIT300 Series test lead connections

An interlock sliding panel prevents connection of unsafe test lead

configurations. (MIT320/MIT330 only)

MIT330 Additional Controls

Warning!

Refer to user

manual

Memory controls

Last

results

recall

Stored

data

download

Last

result

delete

Voltage

measurement

Minimum input

voltage USB download

Lead connection

(330 only)

Red and black test lead

connections

Switch probe Connection

(320 & 300 only)

GENERAL OPERATING INSTRUCTIONS

Safety note:

If a voltage greater than 25 V appears on the circuit under test the

instrument will default to a voltage measurement and display the

supply voltage.

On supply voltages over 50 V the instrument will prevent the

test button from performing an insulation test, protecting your

instrument from damage.

General functions

Voltage Testing on High Energy Systems

Use extreme care when using or measuring voltages above 30 V,

particularly in high energy systems. Fused test leads are available as

optional accessories for local situations where increased protection is

required. See accessories section.

Tests lock

The LOCK Lindicates when an INSULATION test range is locked ON.

It is activated by holding down the [TEST] button, and pressing the LOCK

Lbutton.

Note: See analogue section for MIT310A

Warning: Hazardous voltages can exist on the insulation test range all the

time the [TEST] button is locked down.

Voltage warning (MIT300 only)

If a voltage exists on the circuit under test, the instrument will emit a

warning beep.

If a voltage greater than 50 V exists, testing will be automatically

inhibited.

Batteries

The Megger MIT300 series of instruments are supplied with batteries

fitted. When batteries become exhausted, refer to page 18, battery

replacement.

Warning: Do not switch the instrument on with the battery cover

removed.

Preliminary test lead check

Functional verification

1. Before each use of the instrument visually inspect the test leads, prods

and crocodile clips to confirm that their condition is good, with no

damaged or broken insulation.

2. Check continuity of the test leads by firmly shorting the leads together

and read the test lead resistance measurement directly from the display,

which should be less than 1.0 Ω.

Refer to page 10 for operation guide.

3. Supply voltage

Using an approved method, ensure the circuit to be tested has been

fully disconnected from the supply prior to using the instrument.

PREPARATIONS FOR USE (ALL INSTRUMENTS)

Voltage warning (MIT310A only)

If a voltage exists on the circuit under test the voltmeter will indicate this.

However voltages under 50 V will be displayed but may be difficult to read

from the analogue display.

Default voltmeter (MIT310, MIT320 and MIT330)

The default voltmeter automatically operates if a voltage is present across

the test probes of greater than 25 V.

In Volts range the meter operates at greater than 2 V.

If the voltage exceeds 50 V any further testing is inhibited for safety.

The voltage will be displayed.

Backlight operation (MIT320 and MIT330 only)

Both the display and test ranges are backlit. The backlight function can be

selected at any time while the instrument is switched on by pressing the

BACKLIGHT Jbutton.

The backlight function will switch off automatically 20 seconds after the

instrument has finished testing.

Display warning symbols

GRefer to user manual

Any time the warning triangle is displayed the operator should refer to

the user manual for further information.

LRange lock

Displayed at any time the [TEST] button is locked in the on position.

zLead nulled

Indicates that the test lead resistance has been removed from the test

result.

Battery condition indication. Refer to page 18.

fFuse blown indicator, appears when an instrument fuse has failed.

Refer to page 19.

Test lead connection

The Red/Black test lead set should be connected to the appropriate

sockets on the rear of the instrument marked + and – respectively.

Test probes and crocodile clips are supplied for connection to the circuit

under test.

Fused test leads are available as an optional accessory, please refer to

accessories list at the end of this document.

Application

Do NOT connect this instrument to conductors that exceed the rated

voltage with respect to each other or with respect to earth.

This instrument may be connected to CAT III conductors up to 600 V AC,

or CAT IV conductors up to 300V AC.

See the safety warnings for the definition of CAT ratings.

To maintain user safety and ensure accurate measurements, only use the

test leads supplied by Megger Limited.

4. The display shows the resistance value. (Maximum 99,9 Ω)

5. Disconnect the test probes to terminate the test.

6. On completion of testing switch to the [OFF] position. Alternatively auto

shut off operates after a period of instrument inactivity.

All continuity measurements are AUTO ranging from 0.00 Ω to 100 Ω on

Digital/analogue scale).

The MIT310A has manual range selection to 2 kΩ.

From 0.00 Ω to 10 Ω test current is greater than 200 mA. From 10 Ω to

100 Ω test current is greater than 20 mA. (See page 15 for MIT310A)

Test lead Null

(See page 14 for MIT310A)

Before using the continuity range or buzzer range for the first time, the test

lead resistance should be ‘zeroed out’. This ensures any measurement does

not include the resistance of the test leads.

1. Connect the test leads to the instrument and firmly short both leads

together.

2. Wait for the reading to stabilise and press the [TEST] button.

3. Display of the zconfirms test leads zeroing. The display

should be 0.00 Ω.

Note: Lead zeroing is retained when the instrument is switched off, or auto

shut-off operates.

To remove the ‘lead zero’ press the [TEST] button again.

Continuity test (MIT300, 310,320 and 330)

(See page 15 for MIT310A)

To make a continuity measurement:

1. Turn the instrument ‘On’ by selecting the continuity Ω range.

2. If required, zero test lead resistance, see test lead null (above).

3. Connect the test probes to the isolated circuit under test. The test will

start automatically.

CONTINUITY MEASUREMENT (MIT300, 310, 320, 330)

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