Megger MIT415 User Manual

M

Megger Limited
Archcliffe Road, Dover
Kent CT17 9EN England
T [phone]
F [phone]
E

[e-mail]

Megger
Z.A. Du Buisson de la Couldre
23 rue Eugène Henaff
78190 TRAPPES France
T +33 (0)1 30.16.08.90
F +33 (0)1 34.61.23.77
E [e-mail]

Megger Pty Limited
Unit 26 9 Hudson Avenue
Castle Hill
Sydney NSW 2125 Australia
T [phone]
F [phone]
E [e-mail]

Megger Limited
110 Milner Avenue Unit 1
Scarborough Ontario M1S 3R2
Canada
T [phone] (Canada only)
T [phone]
F [phone]
E [e-mail]

Megger products are distributed in 146 countries worldwide.

This instrument is manufactured in the United Kingdom.
The company reserves the right to change the specification or design
without prior notice.

Megger is a registered trademark

Part No. MIT415_2000-171_V01 1107
www.megger.com

M

MIT415

Insulation and continuity
tester

User Guide

G Safety warnings

n Safety Warnings and Precautions must be read and

understood before the instrument is used. They must be
observed during use.

n 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.

n Circuit connections and exposed-conductive-parts and other

metalwork of an installation or equipment under test

must not

be touched during testing.

n The live circuit warning and automatic discharge are additional

safety features, which may fail, and therefore safe working
practices

must be observed.

n The voltage function will only work if the instrument is

functional and switched on.

n After insulation tests, capacitive circuits must be allowed to

discharge before disconnecting test leads.

n The instrument should not be used if any part of it is damaged.
n All test leads, probes and crocodile clips must be in good order,

clean and with no broken or cracked insulation.

n Ensure that hands remain behind guards of probes/clips when

testing.

n National Safety Authorities may recommend the use of fused test

leads when measuring voltage on high-energy systems.

n 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.

n The battery cover must be in place whilst conducting tests.

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.

Symbols used on the instrument:

F Caution: risk of electric shock

G Caution: 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.

t Equipment protected throughout by Double Insulation

(Class II)

c Equipment complies with relevant EU Directives

Equipment complies with ‘C tick’ requirements

Do not dispose of in the normal waste stream

Maximum input voltage 600 V rms

>

600V

G

LCD Display

Figure 3 LCD display

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

SP5 Switched probe

The SP5 switch probe allows the user to start a test by pressing the
[TEST] button on the probe, instead of on the instrument. This
allows for complete hands-free testing and increases user safety.

AC/DC voltage and frequency measurements

Note: Measured voltage must not exceed 600 V phase to earth or
Phase to Phase.

Note on TRMS measurement:

IN TRMS mode the MIT415 will measure both AC and DC
components of the supply voltage (AC+DC). In DC mode only the
DC component is measured.

1. Rotate selector switch to the ‘V’ position.

2. Connect test leads to the circuit under test.

3. Press the [TRMS] button to select DC or return to TRMS.

4. The measured voltage will be displayed on the main digital scale
in units of V or mV, as appropriate In TRMS mode, the measured
frequency (Hz) will be simultaneously displayed.

Insulation resistance testing - general

Safety note:

Insulation resistance testing is performed at high DC voltages and is

Auxiliary digital display

Continuity indicator

Lock indicator

Warning-refer to
user guide

Fuse blown
indicator

Out of range
indicator

Lead null indicator

Audible alarm
indicator

Battery
condition
indicator

TRMS
indicator