Megger ME1000351 User manual

M
MIT400 Series
Insulation and continuity testers
USER GUIDE

2
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

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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.

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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.
1
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.
2
Circuit connections and exposed-conductive-parts and other metalwork of an
installation or equipment under test must not be touched during testing.
3
The live circuit warning and automatic discharge are additional safety features,
which may fail, and therefore safe working practices must be observed.
4
The voltage function will only work if the instrument is functional and switched on.
5
After insulation tests, capacitive circuits must be allowed to discharge before
disconnecting test leads.
6
The instrument should not be used if any part of it is damaged.
7
All test leads, probes and crocodile clips must be in good order, clean and with no
broken or cracked insulation.
8
Ensure that hands remain behind guards of probes/clips when testing.
9
National Safety Authorities may recommend the use of fused test leads when
measuring voltage on high-energy systems.
10
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.
11
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.

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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