MIT300 Series
Insulation and Continuity Testers
DESCRIPTION
The Megger MIT300, MIT310 and MIT320 all featurethe
popular Megger digital/analog display. Large 20mm high
characters provide very clear readout, combined with an
analog arcfor the feel of an analog instrument, with a true
analog response.
The Megger MIT310A has a moving coil display for those
who prefer a real moving needle. Black decals on a white
background give high contrast, even in poor light
conditions.
Tough:
■Designed to take the bashing that testers receive on site,
the Megger MIT insulation testers arerubber armoured.
■The rigid display cover folds right out of the way during
testing and locks down to protect the display when it is
finished.
Simple to use:
■No buried functions mean it is obvious how to use the
Megger MIT.
■Colour coded ranges help test selection, reducing testing
time and help with fault location.
■Auser guide in the lid provides all the basic
information.
Hands free use:
■It hangs comfortably around the neck for hands-free use
because the instrument is carefully balanced.
■Continuity and buzzer testing starts automatically on
connection to the circuit.
■Insulation tests being activated from the instrument or
the switch probe, supplied with MIT320 and MIT330
(not suitable for the use with the MIT300 or MIT310).
Backlighting:
■Both the display and the range selected can be read in
the dark because the MIT 320/330 has a backlit display
and range selection.
Safety features: To protect the user and the tester from
incorrect use the MIT series all have an extensive range of
features known as the Megger Intelligent Safety System
including:
■Safety Interlock – prevents unsafe connection of test
leads
■Safe contact detectors – Even if the MIT is connected to
alive circuit whilst on continuity setting the tester will
remain safe and not be damaged.
■Live voltage warning – alerts the operator when a circuit
voltage over 25 V exists.
■Safety lockout – Prevents the test from operating when
the circuit voltage is >50 V.
■Continuity check – prevents a continuity test or buzzer
test on a live circuit.
All the MIT instruments meet or exceed the UK and
International Wiring Regulations, including requirements of
BS7671 and VDE 0413 parts 1 and 4, HD 384, IEC 364,
NFC15-100, NEN3140, ES59009 and EN 61557.
■Extremely easy to use
■Tough rubber armoured case
■Self contained protective cover
■Live circuit warning
■Weatherproof to IP54
■Intelligent Safety System for protection
■Result storage and downloading
■Download software included
■USB interface
MIT300 Series
Insulation and Continuity Testers
MIT300 Series
Insulation and Continuity Testers
In addition the range meets the requirements of IEC
61010-1 for safe connection to a 440 V Installation
Category III supply (600 V Phase to Earth).
The MIT330 additionally offers the facility to save test
results to internal memory. Over 1000 result can be saved
onsite, and downloaded to a computer when convenient.
Data is stored in non-volatile memory, being retained
when the instrument is switched off or batteries are
exhausted.
AJob reference number can be selected for a range of
results, allowing separate locations to be tested with the
same tester and easily separated when downloaded.
Amemory bar graph acts as a ‘Fuel Gauge’ showing how
much memory has been used.
Test results are downloaded to CSV (Coma Separated
Variable) spreadsheets, and can be imported into
Microsoft Excel. If certificates or reports are required, the
results can be downloaded directly into Megger
Powersuite Professional with a range of features for
creating professionally finished documentation.
APPLICATIONS
The MIT300 series has applications in all aspects of
domestic, commercial and industrial electrical contracting,
building maintenance, testing, inspection and servicing.
Combining both Insulation testing and continuity testing,
each instrument caters for all aspects of fixed wiring
installations.
Further applications can be found in panel building,
testing of motors, generators, switchgear and power tools,
street lighting and low volume manufacturing
environments etc.
The MIT300 range is supplied with a full 3 year warranty.
SPECIFICATIONS
Insulation ranges
Nominal Test Voltage
MIT310, 310A, 320, 330 1000 V, 500 V, 250 V (d.c.)
MIT300 500 V, 250 V (d.c.)
Measuring Range
All instruments 10 kΩ-999 MΩon all ranges
Short Circuit Current 1.5 mA nominal
Test Current on Load 1mA at min. pass values of
insulation (as specified in BS7671,
HD 384 and IEC 364)
Accuracy (at 20° C)
MIT300, 310, 320, 330 ±3%, ±2 digits up to 10 MΩ,
±5% up to 100 MΩ,±30% up to
full scale
MIT310A <2.5% of scale length (or 30% of
reading 200 kΩto 10 MΩ)
Continuity ranges
Measuring Range: 0.01 Ω-99.9 Ω(0 -50 Ωon
analog scale)
Open Circuit Voltage: 5 V ±1 V
Short Circuit Current:
MIT300, 310, 320, 330 205 mA +10 mA –5 mA
MIT310A 200 - 250 mA
Terminal Characteristics
Accuracy (at 20° C)
MIT300, 310, 320,330 ±3% ±2 digits
MIT310A ±2.5% of scale length (or 30% of
reading 0.2 Ωto 2 kΩ)
Zero Offset Adjust:
MIT300, 310,320, 330 0-9Ω
MIT310A 0 - 0.5 Ω
Continuity Buzzer
MIT300, 310 Operates at < 5 Ω
MIT320, 330 Adjustable 1 Ωto 20 Ω
MIT310A Operates at < 5 Ω
MIT300, 310, 320, 330 Response time <20 ms
MIT310A Response time <100 mS
Resistance range MIT320/330
(can be used for diode testing)
Measuring Range: 10 Ω-1MΩ
Open Circuit Voltage: 5 V
Short Circuit Current: 1.5 mA
Accuracy (at 20° C): ±5% ±2 digits up to 100 kΩ
Measuring Range (MIT310A) 0 - 2kΩ(refer to continuity)
Voltage range
Measuring Range: 0-600 V a.c. (50/60 Hz) or d.c.
Accuracy (at 20° C)
MIT300, 310, 320, 330 d.c. or a.c. (50/60 Hz):
±1%, ±2digits
MIT310A ±2.5% of scale length for 50/60Hz
Temperature coefficient: <0.1% per °C on all ranges.
Default voltmeter
All modes except off
MIT310, 320, 330 >25 V a.c. or d.c. is applied display
will operate as a voltmeter.
MIT300 Beeps and flash ‘V’ on the display
MIT310A All modes including OFF
Test inhibit:
If more than 50 volts is detected, testing will be inhibited.
AutoPower Down (MIT310, 320, 330)
Auto power down operates after 10 minutes if left in standby
mode.
Temperature and humidity
Operating Range: 14°F to 140°F (-10°C to +60°C)
Operating Humidity: 93% R.H. at +40°Cmax.
Storage Range: -13°F to +158°F (-25°C to +70°C)
Test Result Storage (1000 results)
Job Number 255 locations
Distribution Board no. 99 locations
Circuits 99 locations
Phases P1, P2, P3
Last recorded result may be recalled to the display.
All data can be downloaded to a PC using Download Manager
(supplied) or Megger Powersuite Professional of Windows
software
MIT300 Series
Insulation and Continuity Testers
Power supply
Battery: 8 x 1.5 V cells IEC LR6 type(AA alkaline).
Rechargeable NiCd or NiMH cells may be used.
Battery condition is constantly shown on the display as
afour-section bargraph.
Battery Life
5000 consecutive tests (5 seconds per test) on any test using 2Ah
batteries.
Weight
All units: 980 gms
Dimensions
All units: 203 x 148 x 78 mm (8 x 5.7 x 3.2 inches)
E.M.C.
In accordance with IEC61326 including amendment No.1
MIT300 MIT310 MIT310A MIT320 MIT330
Analog
Insulation testing
250 V ■■■■ ■
500 V ■■■■ ■
1000 V ■■■ ■
Test range 999 MΩ999 MΩ999 MΩ999 MΩ999 MΩ
Insulation limit alarm (0.01 MΩto 999 MΩ)■■
Continuity testing
Continuity to 100 Ω■■■■ ■
Continuity buzzer ■■■■ ■
Lead null to 9ohms ■■0.5 Ω■■
Adjustable buzzer 1 to 20 Ω■■
Audible buzzer disable ■■
Voltage measurement
Volts AC/DC 600 V 600 V 600 V 600 V
Resistance measurement
10 Ωto 1 MΩrange ■■
Features
Voltage warning ■
Default voltmeter ■■■ ■
Backlit display ■ ■
Backlight selector ranges ■■
Locking test button ■■■■ ■
Auto powerdown ■■ ■ ■
Switched test probe ■■
IP54 weatherproof ■■■■ ■
Accepts rechargeable batteries ■■■■ ■
1000 Test result storage ■
Downloading ■
Calibration certificate ■■ ■ ■
3year warranty ■■■■
Communications
USB interface
Environmental Protection
IP54
Fuses
Terminals 500 mA (F) 600 V, 32 x 6 mm Ceramic HBC 10 kA
minimum.
Display shows if fuse is ruptured.
Safety
Meets the requirements of IEC61010-1 Cat III 600 V phase to
earth.
Automatic discharge
After an insulation test the item under test will be discharged
automatically. Any voltage present will be indicated on the
display so that the discharge can be monitored.
MIT300 SERIES BENEFITS INCLUDE:
ORDERING INFORMATION
Item (Qty) Cat. No.
MIT300 250 V , 500 V insulation tester MIT300-EN
MIT310 250 V, 500 V, 1000 V insulation tester MIT310-EN
MIT310A 250 V,500 V,1000 V analog
insulation tester MIT310A-EN
MIT320 250 V, 500 V, 1000 V insulation tester MIT320-EN
MIT330 250 V, 500 V, 1000 V insulation tester MIT330-EN
Item (Qty) Cat. No.
Included Accessories
Test lead set and crocodile clips 6220-779
SP4F Switch probe (MIT320 and MIT330 only) 6220-809
Optional Accessories
Fused test lead set 6220-789
PowerSuite Pro-Lite 16th 6111-695
Registered to ISO 9001:2000 Cert. no. Q 09290
Registered to ISO 14001-1996 Cert. no. EMS 61597
MIT300_DS_enUS_V10
www.megger.com
Megger is a registered trademark
MIT300 Series
Insulation and Continuity Testers
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
T1800 723 2861 (USA only)
T+1 214 333 3201
F+1 214 331 7399
USsales@megger.com
OTHER TECHNICAL SALES OFFICES
Täby SWEDEN, Norristown USA,
Sydney AUSTRALIA, Toronto CANADA,
Trappes FRANCE, Kingdom of BAHRAIN,
Mumbai INDIA, Johannesburg SOUTH
AFRICA, and Chonburi THAILAND
