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

Industrial Special

Apps

Insulation Voltage range 400 410 420 430 40X

10-100 V variable (2 GΩ - 20 GΩ)

■

50 V ■■ ■

100 V ■■ ■

250 V ■■■ ■

500 V ■■■ ■

1000 V ■■■■

Insulation range 20 GΩ 100 GΩ 200 GΩ 200 GΩ 2-20 GΩ

Leakage current display

■■ ■ ■

INS test voltage display ■■■ ■■

Continuity measurement

0.01 to 100 Ω

■■■ ■■

Variable current limit. 200 mA/20 mA ■■■ ■■

Fast buzzer- selectable threshold ■■■ ■■

k Ω range to 999 k Ω ■■■ ■

Other functions and features

Live circuit warning at 50 V

■■■ ■■

Default voltmeter ■■■ ■■

TRMS measurement to 600 V ■■■ ■■

Frequency Hz - 40 to 400 Hz ■■ ■ ■

Capacitance (0.1 nf to 10 µF) ■■

Backlight ■■■ ■■

Battery condition display ■■■ ■■

Insulation Timed - PI – DAR Tests ■■ ■

Test button plus lock button ■■■ ■

Limit alarm pass band on INS ■■■

Auto power down ■■■■■

Other functions and features

Result storage

■■

Bluetooth downloading ■

Included accessories

MIT400 Series

Industrial Insulation Testers

Red/black silicone lead set with clips ■■■ ■■

Protective rubber boot ■■■ ■■

Remote switch probe ■■ ■

Calibration certificate with product ■■■ ■■

Batteries ■■■ ■■

3 Year warranty ■■■ ■■

MIT400 Series

Industrial Insulation Testers

SPECIFICATION

All quoted accuracies are at +20°C.

Insulation
Nominal test voltages

MIT400 250 V, 500 V, 1000 V
MIT410, 420,430 50 V, 100 V, 250 V, 500 V, 1000 V
MIT40X 10 V to 100 V variable (1 V increments)

Insulation resistance range

MIT400 20 GΩ
MIT410 100 GΩ
MIT420, 430 200 GΩ
MIT40X 200 GΩ

Range Full Scale Accuracy

All ranges ±2% ±2 digits up to 100 MΩ.

Then:
1000 volts ±3% ±2 digits ±0.2% per GΩ
500 volts. ±3% ±2 digits ±0.4% per GΩ
250 volts. ±3% ±2 digits ±0.8% per GΩ
100 volts. ±3% ±2 digits ±2.0% per GΩ
50 volts. ±3% ±2 digits ±4.0% per GΩ
10 volts ±3% ±2 digits ±2.0% per 100 MΩ

Analogue range: 1 GΩ full scale

Buzzer: Variable limit 1 Ω, 2 Ω, 5 Ω,

10 Ω, 20 Ω

Resistance

Measurement: 0.01 kΩ to 1000 kΩ (0 to 1 MΩ

on analogue scale)

Accuracy: ±3% ±2 digits up to 50 kΩ

then ±5% ±2 digits

Open circuit voltage: 5 V ±1 V
Short circuit current: 1.5 mA ±0.2 mA

Voltage range

0 to 600 V d.c. ±2% ±2 digits
10 mV to 600 V TRMS sinusoidal (40 to 400 Hz) ±2% ±2 digits
0 to 1000 V on Analogue scale
Unspecified input level 0 - 10 mV (40 to 400 Hz)

For non-sinusoidal waveforms additional specification
apply:

±3% ±2 digits 101 mV to 600 V TRMS and ±8% ±2 digits 10 mV to
100 mV TRMS

Default Voltmeter: Operates at >25 V a.c. or d.c.

on any range except OFF

Frequency: 40-450 Hz (40 Hz - 99.9 Hz)

±0.5% ±1 digit (100 Hz to
450 Hz)

Short Circuit Current: 1 mA ±0.2 mA
Terminal voltage: -0% +20% ±1 V

Test Current on load:

1 mA at min. pass value of insulation specified in BS7671, HD384
and IEC364, 2 mA max.

EN61557 Operating range: 0,10 MΩ to 1,00 GΩ

Leakage current range 10 µA 2000 µA

Leakage current: 10% ±3 digits

Voltage display: 3% ±3 digits ±0.5% of rated

voltage

Polarisation Index (PI): 10 min / 1minute ratio

Dielectric Absorption Ratio (DAR): 60 sec / 30 sec ratio

Notes:

(1) All ranges measure from 0,00 MΩ upwards.

(2) Above specifications only apply when high quality silicone leads

are being used.

Continuity

Measurement: 0,01 Ω to 99,9 Ω (0 to 100 Ω on

analogue scale)

Accuracy: ±2% ±2 digits (0 to 100 Ω)
Open circuit voltage: 5 V ±1 V

Capacitance measurement

MIT420, MIT430

Measurement range: 100 pF to 10 µF
Accuracy: ± 5.0% ±2 digits

Distance by capacitance:

MIT420, MIT430
Arithmetic conversion from capacitance measurement on
Default capacitance measurement: 50nF/km

Capacitance range: 40 nF/km to 60 nF/km

Result storage

Capacity: >1000 test results
Download: Bluetooth wireless
Bluetooth Class: Class II
Range: up to 10 m

Power Supply:

5 x 1,5 V cells type IEC LR6 (AA, MN1500, HP7, AM3 R6HP) Alkaline
NiMH rechargeable cells may be used.

Battery life: 2200 insulation tests with duty cycle of 5 sec ON /55
sec OFF @ 1000 V into 1 MΩ

Dimensions

Instrument: 220 x 92 x 50 mm (8.66 in. x 3.63 in. x 1.97 in.)

Instrument + case: 456 x 178 x 89 mm (18 in. x 7 in. x 3.5 in.)

Test current: 205 mA (±5 mA)

(0.01 Ω to 9.99 Ω)
20mA (±1 mA )
(10.0 Ω to 99.9 Ω)

Zero offset at probe tips: 0,10 Ω typical
Lead resistance zeroing: Up to 9.99 Ω

Weight

Instrument only: 590 gms, 775 gms with boot (20.73 oz.

27.22 oz.)
Instrument plus case: 1.75kg (3.86 lb)

Fuse

Use only a 500 mA (FF) 1000 V 32 x 6 mm ceramic fuse of high
breaking capacity HBC 50 kA minimum. Glass fuses MUST NOT be
fitted.

Safety Protection

The instruments meet EN 61010-1 (1995) to 600 V phase to earth,
Category IV. Refer to safety warnings supplied.

E.M.C.

In accordance with IEC 61326 including amendment No.1

Temperature effects

Temperature coefficient: <0,1% per °C up to 1 GΩ

Environmental

Operating range: -20 to +55°C
Operating humidity: 95% RH at 0°C to +35ºC,

70% RH @ +35ºC to +55ºC

Storage temperature range: -30ºC to +80°C
Calibration Temperature: +20°C
Maximum altitude: 2000 m
Dust and water protection:

IP54 Protected against dust and splashing water

MIT400 CATIV

Industrial Insulation Testers

The Bluetooth word mark and logo are owned by the Bluetooth SIG, Inc. and
any use of such marks by Megger is under license.

ORDERING INFORMATION

Item (Qty) Order No.

Basic CATIV 600 V with 250 V/500 V/1000 V insulation

MIT400-EN
As MIT400 + 50 V, 100 V, PI and DAR MIT410-EN
As MIT410 + result storage and recall MIT420-EN
Bluetooth downloading version of MIT420 MIT430-EN
Special selectable voltage 10-100 V MIT40X-EN

Included accessories

Hard case
Test leads: 2 wire lead set to CAT IV 600 V, consisting of :
1 x Red lead 1.25m complete with probe
1 x Black lead 1.25m complete with probe

Item (Qty) Order No.

1 x Red croc clip
1 x Black croc clip
1 x instrument rubber boot
1 x Calibration certificate (not included with MIT40X)
1 x Switched probe (not included with MIT400 and MIT40X)
Owners information CD

Accessories

Replacement lead set 6220-813
SP5 remote switch probe 6220-812
Rubber boot with stand 6231-802
Hard case 5410-420

UK

Archcliffe Road Dover
CT17 9EN England
T [phone]
F [phone]
[e-mail]

UNITED STATES

4271 Bronze Way
Dallas TX 75237-1088 USA
T 800 723 2861 (USA only)
T [phone]
F [phone]
[e-mail]

OTHER TECHNICAL SALES OFFICES

Norristown USA, Sydney AUSTRALIA,
Toronto CANADA, Trappes FRANCE,
Kingdom of BAHRAIN, Mumbai INDIA,
Johannesburg SOUTH AFRICA and
Conjure THAILAND.

Registered to ISO 9001:2000 Cert. no. Q 09290

Registered to ISO 14001-1996 Cert. no. EMS 61597

MIT400_410_420_430_40X_DS_en_V05

www.megger.com
Megger is a registered trademark