MIT400 Series CAT IV
Insulation Resistance and Continuity Testers
DESCRIPTION
The Megger MIT400 Series insulation and continuity testers
has been designed for electrical testing by power utilities,
industrials, telecommunication companies, commercial/
domestic electricians and anyone with unique test voltage
requirements. The wide range of features also makes
the MIT400 Series ideal for maintenance technicians and
engineers.
They replace the well-established BM400 insulation tester
range, giving greater functionality with simplified operation,
greater application range and increased safety.
The range
The range consists of eight instruments:
MIT400 250 V, 500 V and 1000 V
MIT410 50 V, 100 V, 250 V, 500 V and 1000 V plus PI
and DAR
MIT420 Same as Model 410 plus result storage
MIT430 Same as Model 420 plus Bluetooth® download
MIT480 50 V, 100 V
MIT481 50 V, 100 V, 250 V, 500 V, 1000 V plus PI, DAR and
result storage
MIT485 Same as Model 481, plus Bluetooth® download
MIT40X 10 V to 100 V in 1 V steps
n Insulation testing up to 1000 V and 200 GΩ
n Patented analog arc and dual digital display
n CAT IV 600 V rating
n TRMS & DC Voltage measurement
n Continuity testing at 200 mA or 20 mA down to 0.01
n Pass/Fail limit alarms
n PI/DAR and Timer function
n Test result storage
(MIT Models 420, 430, 481 and 485)
n Bluetooth® wireless data transfer
(MIT Models 430 and 485)
n Measurement of capacitance and distance by capaci-
tance (MIT Models 481 and 485)
n User selectable test voltage in 1V increments from
10V to 100V (MIT Model 40X)
n Three year product warranty
n IP54 rated
MIT400 Series CAT IV
Insulation Resistance and Continuity Testers
APPLICATIONS
MIT Models 400, 410, 420 and 430
Industrial and Power Electrical Installation Testing:
These models include all the features required for
electricians, technicians and engineers working in a range
of industries. Available features are selected to make testing
easy and fast in a range of situations. Typical applications
include:
n Building/Campus electrical maintenance
n Large and small scale electrical installations
n Periodic electrical systems inspection and testing
n Cable testing
Panelboard testing is faster, easier and safer with the new MIT400 Series.
Service, Repair and Maintenance:
The MIT Models 410, 420 and 430 add additional features
required for technicians and engineers working on more
demanding applications. Functions such as PI and DAR,
capacitance measurement and a higher insulation range
increase the suitability for applications such as:
n Plant maintenance and production testing
n Panelboard testing
n Railway and other transportation maintenance and testing
n Motor testing
n Cable inspection/quality control
n Street lighting maintenance
n Avionics ground testing and maintenance
n Military hardware and facility maintenance
MIT Models 480, 481 and 485
Telecommunication Testing
Designed to cope with the additional requirements of the
telecommunications industry, MIT Models 480, 481 and 485
include 50 V and 100 V range insulation testing as standard,
plus higher voltages as required.
In addition, the voltage detection test inhibit feature has been
raised to 75 V (from 50 V), to allow testing of cables with
coactivity coupled induced voltages, which would normally
inhibit such testing with a 50 V protected instrument.
Finally the MIT481 and MIT485 models include measurement
of cable distance by capacitance, providing a convenient
cable length without the need to use TDR technology, with
adjustable cable capacitance from 40 nF/Km to 60 nF/Km
(default is 50 nF/Km).
MIT Model 40X
Special Applications Testing
The MIT40X provides a new solution for unique
insulation voltage measurement requirements. The MIT40X
has a variable insulation test voltage from 10 V to 100 V
in 1 V steps, selectable in the “Set-Up” menu.
Typical applications include:
n Commercial avionics testing
n Military land, marine and air communications testing
n Manufacturing/production line testing
n Electrostatic test and measurement
n Component testing
n Battery powered traction and lifting equipment testing
MIT400 Series CAT IV
Insulation Resistance and Continuity Testers
FEATURES AND BENEFITS
n CAT IV 600 V rating – provides greater safety when testing
at higher voltage levels
n Adjustable insulation test voltages – provides 250 V to 1000
V or 50 V to 1000 V. The special applications instrument
(Model MIT40X) offers test voltages from 10 V to 100 V in
1 V steps.
n Dual digital display readout – allows display of
complimentary test information simultaneously
(for example: MΩ plus test voltage or MΩ plus
leakage current)
n Digital and analog arc display – includes not only the
digital readout but also Megger’s patented analog arc to
replicate the response of a moving coil display
n Exceptional measurement range from 20 GΩ to 200 GΩ
- highest insulation test range available on the market,
providing a superior range of measurement applications.
n Choice of 20 mA or 200 mA continuity testing – allows
user to select lower continuity range thus increasing
battery life considerably
n Continuity auto-test capability – enables real two-handed
operation without the need to press the test button
n Adjustable continuity limit alarm – allows pass/fail limits to
be sent to speed testing
n Automatically perform PI and DAR tests – user is able
to quickly perform two important diagnostic tests. . .
Polarization Index (PI) and Dielectric Absorption Ratio
(DAR)
n True RMS voltage measurement – allows accurate voltage
measurement on noisy lines
n Auto ranging voltage measurement – automatically adjusts
range from millivolts to 600 V AC or DC, eliminating the
need to keep changing ranging
n Live circuit warning – automatically warns of contact to a
live circuit, voltage is displayed and testing is inhibited
n Auto fuse warning – warns of fuse failure automatically.
No need to test the fuse manually.
n Buzzer select button – enable or disable buzzer as required
with resistance also displayed on the screen
MIT40X shown measuring electrostatic charge in a computer
control room.
Industrial and Power Telcommunications Special
Applications Applications Application
Insulation Voltage range 400 410 420 430 480 481 485 40X
10-100 V variable (2 GΩ - 20 GΩ) n
50 V n n n n n n
100 V n n n n n n
250 V n n n n n n
500 V n n n n n n
1000 V n n n n n n
Insulation range 20 GΩ 100 GΩ 200 GΩ 200 GΩ 100 GΩ 200 GΩ 200 GΩ 2-20 GΩ
Leakage current display n n n n n n
INS test voltage display n n n n n n n n
Continuity measurement
0.01 to 100 Ω n n n n n n n n
Variable current limit. 200 mA/20 mA n n n n n n n n
Fast buzzer- selectable threshold n n n n n n n n
k Ω range to 999 k Ω n n n n n n
Other functions and features
Live circuit warning at 50 V n n n n n
Live circuit warning at 75 V n n n
Default voltmeter n n n n n n n n
TRMS measurement to 600 V n n n n n n n n
Frequency Hz - 40 to 400 Hz n n n n n n
Capacitance (0.1 nf to 10 µF) n n n n
mV/transducer (0.1 to 19.99 V) n n n n n n n n
Backlight n n n n n n n n
Battery condition display n n n n n n n n
Insulation Timed - PI – DAR Tests n n n n n
Test button plus lock button n n n n n n n n
Limit alarm pass band on INS n n n
Auto power down n n n n n n n
Other functions and features
Result storage n n n n
Bluetooth downloading n n
Included accessories
Red/black silicone lead set with clips n n n n n n n n
Protective rubber boot with built-in stand n n n n n n n n
Remote switch probe n n n n n n
Calibration certificate with product n n n n n n n
Batteries n n n n n n n n
3 Year warranty n n n n n n n n
MIT400 Series CAT IV
Insulation Resistance and Continuity Testers
Instrument Comparison Chart
MIT400 Series CAT IV
Insulation Resistance and Continuity Testers
n MIT Models 480, 481 and 485 for telecommunication
testing applications also include:
n 75 V live circuit inhibit
n Cable length by capacitance measurement
(Model 481 & 485)
n Cable distance in feet or km (Model 481 & 485)
n Extensive results storage capability – store test date for
later recall (Models MIT420, 430, 481 and 485)
n Bluetooth download capability – wireless transfer of stored
results to a PC (Models MIT430 and 485)
n Stylish tapered design and center button placement – easy
to use with either hand
n Each instrument comes complete with:
n New flexible, long-lasting silicone leads
n Rugged instrument rubber boot
n Calibration certificate
n High-impact polypropylene carry case
n Three year product warranty
Instrument Safety
The MIT400 Series instruments are designed to meet all of
the requirements of IEC1010-2 and EN61557 and meets the
safety requirements for use on CAT IV 600 V.
Specific safety features include:
n Any live circuit detection inhibits any insulation testing on
circuits above 50 V (75 volts on Telecom models)
n Any live circuit detection and test inhibit on continuity
measurements
n Default display of live circuit voltage on all ranges
n Detection and inhibit features function even if the
protections fuse has failed
Also, fast detection circuitry prevents damage to the
instruments if accidentally connected to live circuits or across
phases.
Included with every instrument
Each MIT400 Series instrument comes complete with the
following:
n Set of silicone test leads – Flexible and long lasting,
these leads prevent errors from test lead leakage on high
resistance type of insulation testing. They also provide
increased accuracy above 10 GΩ.
n Rugged instrument rubber boot with built-in stand–
Protects the instrument from dings and drops and provides
an easier, better grip of the instrument.
n Plug-in switch probe – Allows the user to remotely
perform insulation tests, reducing the time taken to
perform a test. Not included with the MIT400 and 40X.
n High-impact polypropylene carry case – Further protects
the instrument and provides space for the leads, switch
probe, etc.
n Free calibration certificate (not included with the MIT40X).
n Owner information CD.
n Three year product warranty.
SPECIFICATIONS
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
MIT480 50 V, 100 V
MIT481, 485 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
MIT480 100 GΩ
MIT481, 485 200 GΩ
MIT40X 20 GΩ
Range Full Scale Accuracy
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
Analog range: 1 GΩ full scale
Short Circuit Current: 2 mA +0% -50%
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: 10% ±3 digits
Voltage display: 3% ±3 digits ±0.5% of rated
voltage
Polarization Index (PI): 10 min/1 minute 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
analog scale)
Accuracy: ±3% ±2 digits (0 to 100 Ω)
Open circuit voltage: 5 V ±1 V
Test current: 200 mA (–0 mA +20 mA)
(0.01 Ω to 9.99 Ω)
20mA (±1 mA )
(10.0 Ω to 99.9 Ω)
MIT400 Series CAT IV
Insulation Resistance and Continuity Testers
Zero offset at probe tips: 0.10Ω typical
Lead resistance zeroing: Up to 9.00 Ω
Buzzer: Variable limit 1Ω, 2Ω, 5Ω,
10Ω, 20Ω
Resistance
Measurement: 0.01 kΩ to 1000 kΩ
(0 to 1 MΩ on analog scale)
Accuracy: ±3% ±2 digits
Open circuit voltage: 5 V ±1 V
Short circuit current: 20 µA ± 5 µA
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 Analog 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)
Capacitance measurement
MIT420, MIT430, MIT481 and MIT485
Measurement range: 100 pF to 10 µF
Accuracy: ± 5.0% ±2 digits
Distance by capacitance:
MIT481 and MIT485
Arithmetic conversion from capacitance measurement on
Default capacitance measurement: 50 nF/m
Capacitance range: 40 nF/m to 60 nF/m
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 and case: 456 x 178 x 89 mm (18 in. x 7 in. x 3.5 in.)
Weight
Instrument only: 590 gms (20.73 oz.), 775 gms (27.22 oz.) with boot
Instrument and 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: -10 to +55° C
Operating humidity: 90% RH at 40° C max.
Storage temperature range: -25 to +70° C
Calibration Temperature: +20° C
Maximum altitude: 2000 m
Dust and water protection:
IP54 Protected against dust and splashing water
The Bluetooth word mark and logo are owned by the Bluetooth SIG, Inc.
and any use of such marks by Megger is under license.
Registered to ISO 9001:2000 Cert. no. Q 09290
Registered to ISO 14001-1996 Cert. no. EMS 61597
MIT400Combo_DS_US_en_V04
www.megger.com
Megger is a registered trademark
ORDERING INFORMATION
Item (Qty) Order No.
Model MIT400 250 V, 500 V and 1000 V Insulation & Continuity Tester MIT400EN
Model MIT410 50 V, 100 V, 250 V, 500 V and 1000 V Insulation and
Continuity Tester with PI, DAR and switch probe MIT410EN
Model MIT420 Same as Model MIT410 PLUS capacitance and data storage MIT420EN
Model MIT430 Same as Model MIT420 PLUS wireless Bluetooth® download MIT430EN
Model MIT40X 10 V to 100 V (in 1 V steps) Insulation and Continuity Tester MIT40XEN
Model MIT480 50 V and 100 V Insulation and Continuity Tester MIT480EN
Model MIT481 50 V, 100 V, 250 V, 500 V and 1000 V Insulation and Continuity Tester
with capacitance, cable length measurement, data storage/download and switch probe MIT481EN
Model MIT485 Same as Model MIT481 PLUS wireless Bluetooth® download MIT485EN
Included Accessories
Red/Black silicone test lead set with crocodile clips
Hard carry case
Instrument rubber boot with built-in stand
Calibration certificate (not included with Model MIT40X)
SP5 remote switch probe (not included with MIT400 and MIT40X)
Owner information CD
Optional Accessories
Replacement lead set 6220-813
SP5 remote switch probe 6220-812
Instrument rubber boot with built-in stand 6231-802
Hard carry case 5410-420
Test and carry pouch 6220-860
Instrument Dual Digital Display Example
The MIT400 Series offers an impressive dual digital display readout.
It allows complimentary information to be displayed simultaneously
such as:
n MΩ plus test voltage
n MΩ plus leakage current
n Capacitance plus cable length (a test measurement for telecom ap-
plications)
The following display example shows the key elements of the first
digital display:
MIT400 Series CAT IV
Insulation Resistance and Continuity Testers
The second digital display simultaneously displays the following
information, depending upon the mode of operation or function
chosen:
n Insulation voltage being delivered
n INS test modes
n Leakage current
n Test current
n Timer modes
n Countdown times
n Cable length
Patented
Analog Arc
Single Point
”Pointer”
Test in Progress
Warning
Test Lock
Warning
Battery
Monitor
Second Digital
Display
Autoranging Main
Digital Diplay
Test Result Range
Indicator
UK
Archcliffe Road, Dover
CT17 9EN England
T +44 (0) 1 304 502101
F +44 (0) 1 304 207342
UKsales@megger.com
UNITED STATES
4271 Bronze Way
Dallas, TX 75237-1019 USA
T 1 800 723 2861 (USA only)
T +1 214 333 3201
F +1 214 331 7399
USsales@megger.com
OTHER TECHNICAL SALES OFFICES
Valley Forge USA, College Station
USA, Sydney AUSTRALIA, Täby
SWEDEN, Ontario CANADA, Trappes
FRANCE, Oberursel GERMANY, Aargau
SWITZERLAND, Kingdom of BAHRAIN,
Mumbai INDIA, Johannesburg SOUTH
AFRICA, and Chonburi THAILAND
