Megger ME1000351 Manuale utente

MIT400 Series

Insulation and continuity testers

USER GUIDE

USER GUIDE CONTENTS

1. Introduction 3

2. SafetyWarnings 4

3. Symbolsusedontheinstrument 5

4. GeneralDescription 6

Unpackingthecarton 6

Cartoncontents(allinstruments) 6

5. Preparationsforuse(allinstruments) 7

Batteries 7

Preliminarytestleadcheck 7

6. General operating instructions 8

Generalfunctions 8

LCDDisplay 9

Backlightoperation 10

7. Testleadconnections 11

Standardtestleads 11

SP5 Switched probe (not MIT400, MIT480 and MIT40X) 11

8. AC/DC voltage and frequency measurements 12

9. Insulationresistancetesting-general 13

Standard insulation resistance testing 13

Insulation resistance testing – timed modes ‘t’, PI and DAR 14

10. MIT40Xtesting 17

11. Continuity testing [] and buzzer [ ] 18

12. Resistance measurements (kRange) 19

13. Capacitancemeasurements 20

Capacitance measurement procedure 20

Distance measurement by capacitance 20

14. Setupoptions 21

15. Saving , recalling and downloading test results. 23

Savingtestresults 23

Testresultsrecall 23

PIandDARrecall. 24

16. Deletingtestresults 26

Procedure for deleting a single test result (refer to Figure 16) 26

Procedure for deleting all test results (refer to Figure 19) 27

Preparing your MIT430 or MIT485 for “Bluetooth” Communications 29

Preparing your MIT430 or MIT485 to your PC 29

Standard download operation 32

17. Batteryandfusereplacement 32

Battery condition and replacement 32

Blownfuseindicator 33

18. Preventivemaintenance 33

19. Specification 34

20. Basicandserviceerrors 36

Basicerror 36

Serviceerror: 36

21. Accessories 37

22. RepairandWarranty 39

1. Introduction

Thank you for purchasing the Megger insulation test instrument.

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 MIT400 series of insulation and

continuity test instruments:

These instruments are designed and manufactured by:

Megger Ltd

Archcliffe Road

Dover Kent

CT17 9EN

England

Megger Limited reserves the right to change the specification of these instruments at any

time without prior notice.

2. Safety Warnings

MIT400 series insulation testers

Safety Warnings

and Precautions must be read and understood before the instrument is

used. They must

be observed during use.

The circuit under test must be switched off, de-energised, securely isolated and

proved dead before test connections are made when carrying out insulation and

continuity tests.

Circuit connections and exposed-conductive-parts and other metalwork of an

installation or equipment under test must not be touched during testing.

The live circuit warning and automatic discharge are additional safety features,

which may fail, and therefore safe working practices must be observed.

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

After insulation tests, capacitive circuits must be allowed to discharge before

disconnecting test leads.

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

All test leads, probes and crocodile clips must be in good order, clean and with no

broken or cracked insulation.

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

National Safety Authorities may recommend the use of fused test leads when

measuring voltage on high-energy systems.

Replacement 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.

The battery cover m

must

be in place whilst conducting tests.

N O TE

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.

3. Symbols used on the instrument

F Caution: risk of electric shock

GCaution: refer to accompanying notes

Displayed on the LCD during an insulation test, warns that a hazardous

voltage may exist at the test lead probes also observe voltage discharges

to a safe level.

On battery cover see section 2.0 notes 10 and 11.

At terminals do not exceed rated input voltage.

Equipment protected throughout by Double Insulation (Class II)

Equipment complies with relevant EU Directives

Equipment complies with ‘C tick’ requirements

Do not dispose of in the normal waste stream

G>600 V Maximum input voltage 600 V rms

General Description

4.1 Case contents

There are important documents that you should read and keep for future reference.

Please complete the pre-paid 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.

4.2 Case contents (all instruments)

1 x MIT400 series instrument

1 x Hard carry case

1 x Red/black test lead set with clips

5 x AA (LR6) batteries fitted

1 x Warranty card

1 x Calibration certificate

1 x Owners CD manual

1 x SP5 remote switched probe (Not MIT400 &MIT480)

1 x Download Manager software CD (MIT430 and MIT485 only)

MIT400 storage with holster MIT400 storage with no holster

5. Preparations for use (all instruments)

5.1 Batteries

The Megger MIT400 series instruments are supplied with batteries fitted. When batteries

become exhausted, refer to section17 for battery replacement.

Warning: Do not switch the instrument on or connect test leads with the battery cover

removed.

5.2 Preliminary test lead check

Functional verification

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.

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 .

Supply voltage

With the exception of voltage measurement range, this instrument is designed for

use on isolated (dead) circuits. Prior to any testing and using an approved method,

ensure the circuit to be tested has been fully disconnected and is securely isolated

from the supply prior to using the instrument.

6. General operating instructions

Safety note:

If 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 be prevented from performing an insulation

test, protecting your instrument from damage.

Note: This limit is increased on MIT480, MIT481 and MIT485 to 75 V, but a warning

buzzer will indicate voltages above 50 V.

Use extreme care when using or measuring voltages above 30 V, particularly in high energy

systems.

Fused test leads are available as an optional accessory for local situations where increased

protection is required.

Hazardous voltages can exist on the insulation test range all the time the [TEST] button

is locked down.

6.1 General functions

Figure 3 Main features (MIT430 shown)

Figure 4 Function buttons (MIT430 shown)

Red test lead or

switched probe

Black Test lead

connection

Test button and

lead null

Insulation lock

button

Function

buttons

Battery/internal

fuse access

panel at rear

Result recall and

transfer

Insulation test

ranges

OFF positon

Resistance ranges

Capacitance (μF)

Insulation, PI test, DAR test

or timed test button Up/down buttons

μA/s/V button

Buzzer on/off

Backlight button

Store/last button

TRMS/DC button

Test button

Next button

LCD screen

Voltage range

6.2 LCD Display

6.3 Voltage warning

If the voltage is greater than 25 V the meter automatically displays the voltage.

For MIT400, MIT405, MIT410, MIT420, MIT430 and MIT40X instruments, if a voltage greater

than 50V exists, testing will be automatically inhibited and voltage measurement will be

displayed.

For MIT480, MIT482, MIT485 instruments, if a voltage greater than 75 V exists, testing will be

automatically inhibited and a voltage measurement will be displayed. Voltages higher than 50

V will be indicated by a warning buzzer.

In continuity mode, if a voltage greater than 25 V exists, testing will be automatically inhibited

and voltage measurement will be displayed.

6.4 Backlight operation

All instrument displays are backlit. The backlight function can be selected at any time while

the instrument is switched on by pressing the BACKLIGHT [ ] button. Refer to figure 4.

The backlight function will switch off automatically after 20 seconds.

Multifunction

analogue display

Units of parameters on

auxiliary display

Battery condition

indicator

Audible alarm indicator

TRMS indicator

Units of parameters on

main display

Auxiliary digital display

Continuity indicator

Lock indicator

Warning – refer to

user manual

Fuse blown indicator

Out of range

indicator

Lead null indicator

ure 1 LCD displa

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