Megger MIT320 Specifications

Insulation and Continuity Testers

MIT300 Series

Insulation and Continuity Testers

■ 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

MIT300 Series

DESCRIPTION

The Megger MIT300, MIT310 and MIT320 all feature the
popular Megger digital/analog display. Large 20mm high
characters provide very clear readout, combined with an
analog arc for 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,

ed.

the Megger MIT insulation testers ar

■ The rigid display cover folds right out of the way during

e rubber ar

mour

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.

■ A user guide in the lid provides all the basic

information.

Hands free use:

■ It hangs comfortably ar

ound the neck for hands-fr

ee use

because the instrument is carefully balanced.

■ USB interface

■ 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

es known as the Megger Intelligent Safety System

featur
including:

■ Safety Interlock – prevents unsafe connection of test

leads

■ Safe contact detectors – Even if the MIT is connected to

a live circuit whilst on continuity setting the tester will
remain safe and not be damaged.

■ Live voltage war

ning – alerts the operator when a cir

cuit

voltage over 25 V exists.

■ Safety lockout – Pr

cuit voltage is >50 V

the cir

■ Continuity check – prevents a continuity test or buzzer

events the test from operating when

.

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.

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

esults to internal memory. Over 1000 result can be saved

r

n site, and downloaded to a computer when convenient.

o
Data is stored in non-volatile memory, being retained
when the instrument is switched off or batteries are
exhausted.

A Job reference number can be selected for a range of
results, allowing separate locations to be tested with the

ame tester and easily separated when downloaded.

s

A memory 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 MΩ on all ranges
Short Cir
T

Accuracy (at 20° C)

MIT300, 310, 320, 330

MIT310A

Continuity ranges

Measuring Range:

Open Circuit Voltage: 5 V ±1 V
Short Circuit Current:

cuit Curr

est Curr

MIT300, 310, 320, 330 205 mA +10 mA –5 mA
MIT310A

ent

ent on Load

1.5 mA nominal
1 mA at min. pass values of
insulation (as specified in BS7671,
HD 384 and IEC 364)

±3%, ±2 digits up to 10 MΩ,
±5% up to 100 MΩ, ±30% up to
full scale
<2.5% of scale length (or 30% of

eading 200 k

r

Ω

0.01
analog scale)

200 - 250 mA

Ω to 10 MΩ)

- 99.9 Ω (0 -50 Ω on

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 Ω to 2 kΩ)

Zero Offset Adjust:
MIT300, 310,320, 330
MIT310A 0 - 0.5 Ω

Continuity Buzzer

MIT300, 310 Operates at < 5 Ω
MIT320, 330 Adjustable 1 Ω to 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 - 1 MΩ
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

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):

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

MIT300 Beeps and flash ‘V’ on the display
MIT310A All modes including OFF

est inhibit:

T
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:
Storage Range:

est Result Storage (1000 r

T

Job Number
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

0 - 9 Ω

(refer to continuity)

±1%, ±2 digits

will operate as a voltmeter.

C max.

93% R.H. at +40

°F to +158°F (-25°C to +70°C)

-13

esults)

255 locations

°