Megger MIT400/2 Series Manual de usuario

MIT400/2 Series

Insulation and continuity testers

User guide

www.megger.comMIT400/2

User guide contents

1. Introduction 3

2. GSafety Warnings 4

Symbols used on the instrument 4

WEEE Directive 5

Battery disposal 5

3. General description 6

Unpacking the carton 6

Carton contents (all instruments) 6

4. Preparations for use (all instruments) 7

Batteries 7

Preliminary test lead check 7

5. Instrument overview 8

General functions 8

Display contents 9

Terminal overview 10

6. General operating instructions 11

7. Input Terminals 12

2 terminal test lead connections 12

2 terminal + Guard (MIT2500) 12

3 terminal test lead connection 13

SP5 Switched probe (not MIT400/2) 15

8. AC/DC voltage and frequency

measurements 16

For 2 terminal instruments and MIT2500 16

For 3 terminal instruments

(MIT481/2, MIT485/2 only) 17

Result storage: 18

9. Insulation resistance testing 19

Measurement for 2 terminal instruments

and MIT2500 19

Variable voltage insulation testing

(MIT430/2, MIT485/2, MIT2500) 22

Polarisation Index (PI) and Dielectric

Absorption Ratio (DAR) 22

For 3 terminal instruments

(MIT481/2, MIT485/2 only) 25

ESD testing mode (MIT415/2 and

MIT400ESD) 26

REN mode 27

10. Continuity testing [Ω] 28

Measurement for 2 terminal instruments

and MIT2500 28

Single or bi-directional testing 29

Test lead null 29

Buzzer PASS/FAIL threshold 30

Buzzer ON/OFF 30

PASS / FAIL limit alarm 30

Test current - 20 mA / 200 mA 30

Measurement for 3 terminal instruments 30

Visual fast continuity (silent buzzer) mode 31

REL mode 31

11. Capacitance measurements 32

Capacitance measurement procedure

(2 terminals) 32

Distance measurement by capacitance 32

Capacitance measurement procedure

(3 terminals) 32

12. Saving, recalling and downloading

test results. 33

Saving test results 33

Test results recall 34

PI and DAR recall. 34

Deleting test results 35

Downloading test results 35

Procedure for pairing your MIT to the PC 35

Downloading data to the PC 36

13. SETUP Conﬁguration options 38

14. Speciﬁcation 39

15. Battery and fuse replacement 41

Battery condition and replacement 41

Procedure to replace batteries 41

Blown fuse indicator 42

Fuse replacement procedure 42

Preventive maintenance 42

16. Repair and Warranty 43

Calibration, Service and Spare Parts 43

www.megger.comMIT400/2

1. Introduction

Thank you for purchasing the Megger insulation test instrument.

For your own safety and to get the maximum beneﬁt from your instrument, please ensure that you read and understand the following

safety warnings and instructions before attempting to use the instruments.

This user guide describes the operation and functions of the MIT400/2 series of insulation and continuity test instruments.

These instruments are designed and manufactured by:

Megger Ltd

Archcliffe Road

Dover Kent CT17 9EN

England

Megger Limited reserves the right to change the speciﬁcation of these instruments at any time without prior notice.

www.megger.comMIT400/2

2. Safety Warnings

2.1 Safety Warnings

Safety warnings and precautions must be read and understood before the instrument is used. They must be observed during use.

 National Health and Safety Legislation requires users of this equipment and their employers, to carry out valid risk

assessments of all electrical work so as to identify potential sources of electrical danger and risk of electrical injury such

as inadvertent short circuits. Where the assessments show that the risk is signiﬁcant then the use of fused test leads

may be appropriate.

 The voltage indicator and automatic discharge features must be regarded as additional safety features and not a

substitute for normal safe working practice which MUST be followed.

 The circuit under test must be switched off, de-energized, securely isolated and proved dead before test connections

are made when carrying out insulation and continuity tests.

 Test voltages greater than 1000 V dc must not be used on capacitive circuits. Capacitive charges can be lethal.

 Circuit connections and exposed-conductive-parts and other metalwork of an installation or equipment under test must

not be touched during testing.

 The Voltmeter function will operate only if the instrument is switched on and working correctly.

 After an insulation test, the instrument must be left connected until the circuit has been discharged to a safe voltage.

 Do not handle test leads above the 1000 V range. (For use in dry conditions only).

 The instrument should not be used if any part of it is damaged.

 All test leads, probes and crocodile clips must be in good order, clean and with no broken or cracked insulation. Verify

the integrity of the test leads before making measurements. Only “Megger” approved test leads must be used with this

product.

 Ensure that hands remain behind ﬁnger guards of probes/clips.

 National Safety Authorities may recommend the use of fused test leads when measuring voltage on high-energy

systems. Fused Leads must be tested independently before use to ensure fuse integrity.

 Replacement fuses must be of the correct type and rating. Failure to ﬁt the correctly rated fuse may result in a safety

hazard and may cause damage to the instrument in the event of an overload.

 All covers must be in place whilst conducting tests.

 If this equipment is used in a manner not speciﬁed by the manufacturer, the protection provided by the equipment may

be impaired.

 The instrument must be used only by suitably trained and competent persons.

Grefer to user instructions

Frisk of electric shock

> 600 V

CATIV 600 V

g600 V ac rms maximum between

terminals, and between terminal

and earth

IP54 Enclosure is dust proof and

protected against water splashes

fFuse FF 500mA 1000V 30kA

t Equipment protected throughout

by Double Insulation.

Equipment complies with current

EU directives.

N13117 Equipment complies with

current “C tick” requirements.

Do not dispose of in the normal

waste stream.

Safety symbols marked on the instrument

www.megger.comMIT400/2

Installation Category Deﬁnitions:

CAT IV - Measurement category IV: Equipment connected between the origin of the low voltage mains supply and the distribution

panel.

CAT III - Measurement category III: Equipment connected between the distribution panel and the electrical outlets.

CAT II - Measurement category II: Equipment connected between the electrical outlets and the user’s equipment.

Measurement equipment may be safely connected to circuits at the marked rating or lower.

2.2 WEEE Directive

The crossed out wheeled bin symbol placed on Megger products is a reminder not to dispose of the product at the end

of its life with general waste.

Megger is registered in the UK as a Producer of Electrical and Electronic Equipment. The Registration No is WEE/

HE0146QT.

For further information about disposal of the product consult your local Megger company or distributor or visit your local

Megger website.

2.3 Battery disposal

The crossed out wheeled bin symbol placed on the batteries is a reminder not to dispose of them with general waste at the end of

their life.

This product contains the following batteries - AA alkaline batteries.

They are located under the battery cover at the rear of the instrument.

They can be safely removed by following the instructions in the battery replacement section of this guide.

Dispose of batteries according to local authority regulations.

Megger is registered in the UK as a producer of batteries.

The Registration number is BPRN00142.

For Further information see www.megger.com

www.megger.comMIT400/2

3.1 Unpacking the carton

There are important documents that you should read and keep for future reference.

3.2 Case contents (all instruments)

MIT400/2 MIT405/2 MIT410/2 MIT415/2 MIT417/2 MIT420/2 MIT430/2

MIT400/2 series instrument MIT400/2 MIT405/2 MIT410/2 MIT415/2 MIT417/2 MIT420/2 MIT430/2

Hard carry case 

Soft carry case

Red/black

test lead set with clips 

Red/Green/Black

test lead set

Red/Blue/Black

2.5 kV test lead set

AA (LR6) batteries ﬁtted 6666666

Warranty card 

Calibration certiﬁcate 

Owners CD manual 

Quick start guide 

SP5 remote switched probe 

Download Manager software CD 

MIT481/2 MIT485/2 MIT2500

MIT480/2 series instrument MIT481/2 MIT485/2 MIT 2.5 kV series instrument MIT2500

Hard carry case   Hard carry case 

Soft carry case Soft carry case

Red/black

test lead set with clips

Red/black

test lead set with clips 

Red/Green/Black

test lead set   Red/Green/Black

test lead set

Red/Blue/Black

2.5 kV test lead set

Red/Blue/Black

2.5 kV test lead set 

AA (LR6) batteries ﬁtted 6 6 AA (LR6) batteries ﬁtted 6

Warranty card   Warranty card 

Calibration certiﬁcate   Calibration certiﬁcate 

Owners CD manual   Owners CD manual 

Quick start guide   Quick start guide 

SP5 remote switched probe   SP5 remote switched probe

Download Manager software CD Download Manager software CD 

IMPORTANT -

To extend your warranty to 3 years, please register your Instrument at www.megger.com within one month of purchase.

3. General Description

www.megger.comMIT400/2

4. Preparations for use (all instruments)

4.1 Batteries

The Megger MIT400/2 series instruments are supplied with batteries ﬁtted. When batteries become exhausted, refer to section 15 for

battery replacement.

Warning: Do not switch the instrument on or connect test leads with the battery cover removed.

4.2 Preliminary test lead check

Functional veriﬁcation

1. Before each use of the instrument visually inspect the test leads, prods and crocodile clips to conﬁrm that their condition is

good, with no damaged or broken insulation.

2. Check continuity of the test leads by ﬁrmly shorting the leads together and read the test lead resistance measurement directly

from the display, which should be less than 1.0 W.

Note: Supply voltage

This instrument is designed for use on isolated (dead) circuits. Prior to any testing and using an approved method, ensure the circuit to

be tested has been fully disconnected and is securely isolated from the supply prior to using the instrument.

www.megger.comMIT400/2

5. Instrument overview

5.1 General functions

5.1.1 Rotary knob position:

Test functions are selected by turning the rotary knob from the OFF position to the desired function. The display will show the initial

screen for that function.

Press a black keypad button to change the test mode from the standard measurement, or to select the Backlight and Buzzer ON/OFF.

The rotary knob should always be returned to the OFF position after use. Do not rely on the AUTO OFF function as this unnecessarily

wastes battery life.

OFF Instrument OFF – no live circuit warning

VTrms Voltage AC/DC

500 V Insulation test range –

Press & hold button

500 V

LInsulation test range with gate*–

Press & hold Lto enable range

when selecting test function with rotary knob

(* where available)

WContinuity measurement from 0.01Wto

999 kW(automatic)

µF Capacitance measurement ( automatic)

Insulation test lock - Press and Lto

LOCK test ON

Start insulation test Press & HOLD to start

INSULATION test

W+ Nulls test lead resistance to 0.00W

when leads short circuit

Enter SETUP conﬁgurator (use and

Lto adjust settings)

5.1.2 Keypad button functions:

TRMS

Selects AC-Trms or DC mode

Insulation testing - Selects DAR, PI, Timed test

(t) or standard measurement (INS)

Insulation testing – Press during test for;

leakage (uA), test voltage (V) or timer (t))

Buzzer ON/OFF – not warning functions

Backlight ON/OFF

SETUP – Change setup value / After test –

SAVE result

SETUP – Select setup function

SETUP – Change function value

A+E+B

T+G+R Swaps measurement connection between

A-B, A-E & B-E (T-R, T-G & R-G)

Continuity testing – Press after “Continuity

measurement” to make “difference

measurement”

Insulation testing – Measures REN value

during insulation test

Capacitance testing – Measures REN value

during capacitance test

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5.2 Display contents

Symbol Description Symbol Description

GW, MW, kW, W, V, mV,

A, mA, Hz, nF, uF Units of measurement Measurement FAIL / PASS

Primary digital readout 3 Terminal selection status

Secondary digital readout REN measurement function enabled

Analogue readout with needle Transfer data to PC

Buzzer is enabled Save test measurement to memory

Lock enabled / disabled Test result recall to screen

FHazard voltage warning Delete test results

GWarning - Read user manual Bluetooth®enabled

zLead Null is enabled Battery condition

DW Difference between two ohms

measurements fFuse fail warning

+35

100.01

8100.1

61004100

2100

-1510

8765

+30

+20

+10

-10

A E B

T G R

G mA

W WD

FdB

k V kft

kVs

Main digital

display

Secondary digital

display

Analogue arc and

pointer

Warning and

Advisory symbols

Storage and

downloading

symbols

A E B

T G R

www.megger.comMIT400/2

5.3 Terminal Overview

2 terminal connection 2 terminal connection 3 terminal connection

+ Guard

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