Megger MIT417 Manuale utente

MIT415 / MIT417

Insulation and continuity

tester

User Guide

GSafety warnings

nSafety Warnings and Precautions must be read and

understood before the instrument is used. They must be

observed during use.

nThe circuit under test must be switched off, de-energised,

securely isolated and proved dead before test connections are

made when carrying out insulation and continuity tests.

nCircuit connections and exposed-conductive-parts and other

metalwork of an installation or equipment under test must not

be touched during testing.

nThe live circuit warning and automatic discharge are additional

safety features, which may fail, and therefore safe working

practices must be observed.

nThe voltage function will only work if the instrument is

functional and switched on.

nAfter insulation tests, capacitive circuits must be allowed to

discharge before disconnecting test leads.

nThe instrument should not be used if any part of it is damaged.

nAll test leads, probes and crocodile clips must be in good order,

clean and with no broken or cracked insulation.

nEnsure that hands remain behind guards of probes/clips when

testing.

nNational Safety Authorities may recommend the use of fused test

leads when measuring voltage on high-energy systems.

nReplacement 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.

nThe battery cover must be in place whilst conducting tests.

NOTE

THE INSTRUMENT MUST ONLY BE USED BY SUITABLY

TRAINED AND COMPETENT PERSONS.

Users of this equipment and/or their employers are reminded

that National Health and Safety Legislation requires them 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.

Symbols used on the instrument:

F Caution: risk of electric shock

GCaution: refer to accompanying notes

Displayed on the LCD during an insulation test, warns that a

hazardous voltage may exist at the test lead probes also

observe voltage discharges to a safe level.

On battery cover see section 2.0 notes 10 and 11.

At terminals do not exceed rated input voltage.

tEquipment protected throughout by Double Insulation

(Class II)

c Equipment complies with relevant EU Directives

Equipment complies with ‘C tick’ requirements

Do not dispose of in the normal waste stream

Maximum input voltage 600 V rms

>600V

LCD Display

Figure 3 LCD display

In continuity mode, if a voltage greater than 25 V exists, testing

will be automatically inhibited and voltage measurement will be

displayed.

SP5 Switched probe

The SP5 switch probe allows the user to start a test by pressing the

[TEST] button on the probe, instead of on the instrument. This

allows for complete hands-free testing and increases user safety.

AC/DC voltage and frequency measurements

Note: Measured voltage must not exceed 600 V phase to earth or

Phase to Phase.

Note on TRMS measurement:

IN TRMS mode the instrument will measure both AC and DC

components of the supply voltage (AC+DC). In DC mode only the

DC component is measured.

1. Rotate selector switch to the ‘V’ position.

2. Connect test leads to the circuit under test.

3. Press the [TRMS] button to select DC or return to TRMS.

4. The measured voltage will be displayed on the main digital scale

in units of V or mV, as appropriate In TRMS mode, the measured

frequency (Hz) will be simultaneously displayed.

Insulation resistance testing - general

Safety note:

Insulation resistance testing is performed at high DC voltages and is

hazardous if touched. Always observe the safety precautions when

Auxiliary digital display

Continuity indicator

Lock indicator

Out of range

indicator

Lead null indicator Audible alarm

indicator

Battery

condition

indicator

TRMS

indicator

Warning-refer to

user guide

performing an insulation resistance test, and ensure all necessary

health and safety precautions are observed.

Automatic Discharge: Capacitive circuits are automatically

discharged when the test button is released following an insulation

test.

The circuit under test must be completely de-energised and

securely isolated before test connections are made.

Standard insulation resistance testing

1. Connect the test probes to the isolated circuit under test.

2. Turn the instrument ‘ON‘ by rotating the selector switch to the

desired test voltage.

3. Press and hold the [TEST] button to start the test.

4. The insulation resistance value, in both analogue and digital form

is displayed together with the actual test voltage displayed on the

secondary display.

5. The insulation test can be locked on, by pressing the lock button

[ ] whilst holding down the [TEST] button. To disable lock

press the [TEST] button or lock [ ] button.

6. By pressing the [uA/V/s] button, the leakage current can be

displayed.

7. Release the [TEST] button before removing the test leads (to

enable the instrument to discharge the circuit under test). If the

display shows VOLTS, wait until it reaches zero.

8. On completion of testing, switch to the ‘OFF’ position.

Insulation resistance testing – timed modes ‘t’, PI and

DAR

Three types of timed test are possible:

(a) Standard count down timer (t)

Timed tests are performed over a timed period defined by

parameter ‘t’ (also refer to Set-up procedures 13).

(b) Polarization Index (PI)

PI is the ratio between the insulation resistance values recorded at

1 minute (assigned t1) and at 10 minutes interval (assigned t2). i.e.

after 1 minute and 10 minutes.

PI = 10 minute value/1 minute value

Audible alarm

indicator

DAR is the ratio between the insulation resistance values at

30seconds (assigned t1) and at 60 second interval (assigned t2). i.e.

after 30seconds and 60seconds.

DAR = 60 second value/30 second value

During all insulation tests the symbol Gwill flash indicating that a

test voltage is present.

(a) Insulation resistance testing-timed procedure.

1. Connect the test probes to the isolated circuit under test.

2. Turn the instrument ‘ON‘ by rotating the selector switch to the

required test voltage position.

3. Select the timed test (t) by pressing ‘PI/DAR/t’ function button

repetitively until the desired function is displayed.

4. Once selected, press and hold the [TEST] button to start the test.

5. To abort the test early, press TEST or LOCK [ ] buttons.

6. At the end of the tests, the voltage will be discharged.

(b) Insulation resistance testing – PI and DAR

The PI test will run for a period of 10minutes. After one minute a

test result is stored (t1). After 10 minutes a second test result is

stored (t2). The resultant ratio is then displayed on the screen.

The same procedure applies for the DAR timed tests, however the

test duration is 60 seconds, with the first result (t1) taken at 30

seconds and the second at 60 seconds (t2).

Results can be recalled to screen using the uA/v/s [t] keys.

Note: DO NOT press PI/DAR/t [s] as it will change the test mode

and erase the current results.

Continuity testing [Ω] and buzzer [ ]

1. Turn the instrument ‘ON’ by rotating the selector switch to the

desired Ωposition.

2. If required the test lead resistance can be set to Zero (null) by

shorting the test leads together and pressing TEST. The null

[z] symbol will show when this has been achieved and the

display will read 0.00 Ω.

3. Press the [ ] button to enable/disable the audible buzzer

function. When enabled, the sounder symbol will be shown on

the screen display. The pass threshold is set to 2 Ωby default,

but is adjustable, as defined in Setup.

Note that the buzzer defaults to OFF on power-up.

4. Connect the test leads to the isolated conductor(s) under test.

5. Observe the test result, displayed automatically. The auxiliary

display indicates the actual test current (e.g. 205 mA. The

maximum is defined in setup menu.

Note: The test current displayed is the actual test current used

during the test, which will depend on the resistance of the circuit

under test.

Resistance measurements (kΩRange)

1. Turn the instrument ‘ON’ by rotating the selector switch to the

desired [kΩ] position.

2. Connect the test leads to the isolated conductors under test.

3. Observe the test result, displayed automatically.

Setup options

The setup position permits the user to adjust various threshold

values and default settings. When SETUP is selected, the instrument

firmware revision is displayed, followed by the buzzer alarm

threshold.

Displayed Meaning

symbol

Default

setting

Setting

options

BUZ Set top threshold for

continuity buzzer in

ohms.

2 Ω

1, 2, 5, 10, 20

Buzzer sounds if

result is less than set

value.

Loc Lock button ON/OFF ON ON / OFF

ISC

Setup maximum

continuity short-circuit

current.

200 mA 20 mA, 200 mA

(default 200 mA)

Setup procedure

1. Turn the instrument ‘ON’ by rotating the selector switch to the

Setup position. The firmware version is displayed prior to the first

setting BUZ.

2. Press the TEST button repeatedly to select the desired parameter,

BUZ, Loc, ISC etc.

3. When the function to be changed is displayed, press and

hold the TEST button to change the value. Each subsequent

press increments the limit. Holding down the TEST button will

automatically increment.

4. Changing a value will start the lock [ ] symbol flashing. This

indicates a value has been changed

but not saved.

5. Save new limit by pressing the Lock [ ] button. Saved changed

are effected when the Screen Lock symbol stops flashing and

disappears.

Battery and fuse replacement

Battery condition and replacement

The battery condition indicator is displayed at all times that the

instrument is switched on, as below: 100%, 75% and 50%.

Replacement batteries type is: 5 x LR6 (AA), 1.5 V alkaline, or 5 x

1.2 V NiMH.

Note: NiMH or NiCAD rechargeable batteries show a lower charge

than alkaline batteries, and may not give much warning before

becoming exhausted.

Procedure to replace batteries

When the low battery symbol appears, the cells are nearly

exhausted and should be replaced as soon as possible. To

install or replace the cells, disconnect the test leads, switch

the instrument OFF and loosen the screws holding the battery

compartment cover in place. Remove the cover and lift out the

cells. Ensure that the replacement cells are fitted with the correct

polarity in accordance with the label in the battery compartment.

Replace and re-secure the battery compartment cover. Remove

the cells if the instrument is not going to be used for an extended

period of time.

WEE Directive

The crossed out wheeled bin symbol on the instrument and on the

batteries is a reminder not to dispose of them with general waste at

the end of their life.

Megger is registered in the UK as a producer of electrical and

electronic equipment.

Registration number WEE/H0146QT.

Battery disposal

Instructions on the safe removal of batteries can be found in this

document.

Batteries in this product are classified as portable batteries under

the Batteries Directive and when spent, should be disposed of in

the UK according to Local Authority requirements.

For disposal of batteries in other parts of the EU contact your local

distributor.

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

Registration number BPRN00142.

Blown fuse indicator

To check the instrument fuse, switch to an insuation range and

press the TEST button. If the fuse is ruptured, the flashing symbol

is displayed.

Note: The voltmeter will continue to operate for voltages greater

than 100 V at 50 Hz. To replace the fuse, disconnect the test leads,

switch the instrument OFF and loosen the screws holding the

battery compartment cover in place. Remove the cover and replace

the fuse of the correct type and rating. Replace and re-secure the

battery compartment cover.

Follow the same procedure as for battery replacement

A replacement fuse must be of the correct type and rating:

i.e. 500 mA (FF) H.B.C.50 kA min 1000 V (32 mm x 6 mm)

Preventive maintenance

When necessary, the instrument can be cleaned with a damp cloth.

Do not use alcohol based cleaners.

Specification

All quoted accuracies are at +20 °C.

Insulation

Nominal test voltages for MIT415:

10 V, 25 V, 50 V, 100 V, 250 V, 500 V

Nominal test voltages for MIT417:

10 V, 25 V, 50 V, 100 V, 250 V, 500 V,

1000 V

Range full scale accuracy

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

Then:

1000 volts. ±3% ±2 digits 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

25 volts. ±3% ±2 digits ±8% per GΩ

10 volts. ±3% ±2 digits ±20% per GΩ

Analogue range: 1 GΩfull scale

Short circuit current: 2 mA +0% -50%

Terminal voltage: -0% +20% ±1 V (Ii <1 mA)

Test current on load:

1 mA at min. pass value of insulation specified in BS7671,

HD384 and IEC364, EN61152-2, 2 mA max.

EN61557 operating range: 0,10 MΩto 1,00 GΩ

Leakage current range: 10 µA to 2000 µA

Leakage current: 10% ±3 digits

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

voltage

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

Notes:

(1) All ranges measure from 0,00 MΩupwards.

(2) Above specifications only apply when high quality

silicone leads are being used.

Continuity

EN61557 operating range: 0,01 Ωto 99,9 Ω(0 to 100 Ωon

analogue scale)

Accuracy: ± 2% ± 2 digits (0 to 100 Ω)

Open circuit voltage: 5 V ± 1 V

Test current: 205 mA (±5 mA) (0.01 Ωto 9.99 Ω)

20 mA (±1 mA) (10.0 Ωto 99.9 Ω)

Lead resistance zeroing: Up to 9,99 Ω

Buzzer:

Variable limit 1 Ω, 2 Ω, 5 Ω, 10 Ω, 20 Ω

Resistance

EN61557 operating range:

0,01 kΩto 1000 kΩ(0 to 1 MΩon analogue scale)

Accuracy: ±3% up to 50 kΩthen ±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 – 400 Hz) ±2% ±2 digits

0 to 1000 V on analogue scale

Unspecified input level 0 – 10 mV (40 – 400 Hz)

For non sinusoidal waveforms additional specifications apply:

±3% ±2 digits 101 mV – 600 V TRMS and

±8% ±2 digits 10 mV – 100 mV TRMS

Default Voltmeter

Operates at >25 volts a.c. or d.c., on any range except OFF

Frequency: 15-400 Hz (15 Hz - 99,9 Hz) ±0.5% ±1 digit

(100 Hz to 400 Hz)

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

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