MEGGER MIT400 CAT IV Installation Manual
MIT400 CAT IV
Industrial Insulation Testers
■ CAT IV 600 V applications
■ TRMS & DC Voltage measurement
■ Insulation testing up to 1000 V and
200 GΩ
■ Continuity testing at 200 mA or 20 mA
down to 0.01 Ω
■ Pass/Fail limit alarms
■ Combined Analogue and dual digital
display
■ PI/DAR and Timer function
MIT400 CAT IV
Industrial Insulation Testers
DESCRIPTION
The new Megger MIT400 series insulation and continuity
testers has been designed for electrical testing by the
utilities, industrial, commercial and domestic electricians.
The wide range of features also makes the MIT400 series
ideal for the maintenance and service/repair engineer.
They replace the well-established BM400 insulation tester
range, given greater functionality with simplified operation,
greater application range and increased safety.
The range
The range consists of five instruments:
MIT400 250 V, 500 V and 1000 V
MIT410 50 V, 100 V, 250 V, 500 V and 1000 V + PI, DAR
MIT420 50 V, 100 V, 250 V, 500 V & 1000 V + PI, DAR and
result storage
MIT430 50 V, 100 V, 250 V, 500 V & 1000 V + Bluetooth
download
MIT40X 10 V to 100 V in 1 V steps
INSULATION TESTING
■
Test voltages - 250 V to 1000 V or 50 V to 1000 V
insulation test voltages available
■
Test Lock - Locks insulation test on continuously.
■
Test voltage display - The actual test voltage is displayed
on the smaller digital readout, with the insulation result
on the larger digital display.
■ Test result storage (MIT420)
■ Bluetooth
®
wireless data transfer
(MIT430)
■
Analogue arc - The display also features an analogue arc
to replicate the response of a moving coil display.
■
PI and DAR - Polarisation Index (PI) and Dielectric
Absorption Ratio (DAR) functions
■
200 GΩ - Insulation testing from 20 GΩ (MIT400) to
200 GΩ (MIT420 and MIT430).
■
Silicone leads - High quality flexible silicone test leads
are comfortable to use and prevent measurement errors
on higher GΩ ranges.
■
Test inhibit - prevents testing if voltages in excess of 50 V
are detected when making insulation tests.
■
Insulation buzzer - The buzzer can be set to buzz if the
insulation resistance is above a preset limit, set via the
Setup menu.
CONTINUITY TESTING
■
Auto-test - Auto test on circuit contact enables real two
handed operation without the need to press the test
button.
■
200 mA or 20 mA - Either 200 mA or 20 mA continuity
test currents are available. 20 mA test current will
considerably increase battery life.
■
Lead null - Lead resistance compensation (NULL)
operates up to 9.99 Ω of resistance.
■
Buzzer - ON-OFF selected by simple push button.
■
Buzzer limit - Continuity buzzer limit alarm provides
adjustment of the maximum resistance the continuity
buzzer sounds. This is adjustable from 1 Ω to 20 Ω in 5
steps.
MIT400 Series
Industrial Insulation Testers
■
kΩ range extends resistance measurement to 1 MΩ.
DISPLAY
The display offers a combination of analogue arc and a dual
digital readout:
Analogue arc:
■
Full display width analogue arc.
■
Patented arc display shows essential charge and discharge
characteristics not visible on a digital display.
■
Single pointer “needle” response is similar to a moving
coil meter.
■
Logarithmic display for better low insulation value
measurements.
Dual digital display:
■
Large main digital readout for good visibility of all main
measurement results
■
Second digital display for additional data such as:
Insulation test voltage.
Insulation leakage current.
Supply frequency (when measuring volts).
Test mode eg. PI, DAR or TI (Timed mode).
MIT40X - VARIABLE INSULATION VOLTAGE
TESTER.
The MIT40X provides a unique solution for awkward
insulation voltage measurement applications. The MIT40X
has a variable insulation test voltage from 10 V to 100 V in
1 V steps, selectable in the “Set-Up” menu. Once selected
this can only be changed by re-configuring in the Setup
menu.
Typical applications include:
■
Commercial avionics
■
Military land, marine and air communications
■
Manufacturing/production line goods
■
Electrostatic measurement
■
Component testing
■
Battery powered traction and lifting equipment
STORAGE & DOWNLOADING RESULTS
MIT420
The MIT420 is capable of saving test results for recall to the
screen. A simple storage structure allows for a test number
and screen results to be recalled individually.
MIT430
The MIT430 supports both test result storage and downloading.
Test results can be stored in the instrument and subsequently downloaded to a computer with the Megger download manager software.
Data transfer is by Bluetooth, with the MIT485 Bluetooth
transmitter being enabled when the Download mode is
selected on the instrument.
NOTE: The receiving PC needs to have Bluetooth capability
or a USB port fitted a Bluetooth receiver. Class II (10m) is
acceptable.
SAFETY
Designed to be exceptionally safe to use, fast detecting
circuitry prevents damage to the instruments if accidentally
connected to live circuits or across phases. Specifically, all
instruments:
■
Meet the international requirements of IEC1010-2 and
EN61557.
■
Live circuit detection inhibits insulation testing on circuits
above 50 V.
■
Live circuit detection and test inhibit on continuity
measurements.
■
Default display of live circuit voltage on all ranges.
■
Detection and inhibit functions even if the protection
fuse has failed.
■
Suitable for use on CAT IV applications and supply
voltages to 600 V.
600 V CAT IV
All MIT400 instruments are designed to meet the safety
requirements for use on CAT IV 600 V.
APPLICATIONS
(A) Electrical installations testing:
The MIT400 includes all the features required for
electricians and engineers working in a range of industries.
Available features are selected to make testing easy and fast
in a range of situations. Typical industries include:
Electrical supply companies
Large and small scale electrical installation
Periodic inspection and testing
Cable testing
(B) Service, repair and maintenance:
The MIT410 and MIT420 add additional features required
for engineers working on more demanding applications.
Functions such as PI and DAR, capacitance measurement
and higher insulation range increase the suitability for
applications such as:
Manufacturing/production testing
Panel building
Railway and other transportation
Motor testing
Cable inspection/quality control
Street lighting maintenance
Avionics ground testing and maintenance
Military applications
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