Megger MTB7671 Manuale utente

MTB7671/2

Test box

User Guide

GSafety warnings

Safety Warnings and Precautions must be read and

understood before the instrument is used. They must be

observed during use.

Only use the MTB7671/2 when both polarity indicator

LEDs are lit.

The MTB7671/2 is protected by an integral RCD plug which

MUST NOT be removed from the tester.

The interlock protected 13 A socket should only be used with

double insulated RCD and Loop testers.

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

Replacement fuses must be of the correct type and rating. Failure

to fit the correctly rated fuse may result in a safety hazard.

Only shrouded test leads should be used when measuring the

230 V a.c. mains supply

Users of this equipment and/or their employers are reminded that 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

CAT II - Measurement category II: Equipment connected between the

electrical outlets and the user’s equipment.

CAT III - Measurement category III: Equipment connected between the

distribution panel and the electrical outlets.

CAT IV - Measurement category IV: Equipment connected between the origin

of the low-voltage mains supply and the distribution panel.

NOTE

THE INSTRUMENT MUST ONLY BE USED BY SUITABLY

TRAINED AND COMPETENT PERSONS.

Symbols used on the instrument:

F Caution: risk of electric shock

GCaution: refer to accompanying notes

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

Interlock cover AC out supply

Fuse Fuse

RCD and loop

test supply

socket

Continuity and

insulation test

select switch

Continuity

and insulation

connection

sockets

Supply

check

indicators

RCD and loop

test select switch

MTB7671/2

LOOP

+10Ω

OPERATION

The MTB7671/2 is intended for use with double insulated test

instruments only.

The MTB7671/2 has a combined earth and neutral which stops

it from tripping RCD protected circuits. To prevent the danger of

electric shock the MTB7671/2 is protected by a RCD plug and uses

a safety interlock for all live circuit tests.

1. SWITCHING ON

To switch on the MTB7671/2, plug the unit into the 230 V 50 Hz

mains supply using the integral RCD plug and depress the button

on the top of this plug and release, this will switch the plug on.

The bars on the plug should show red to indicate the unit is pow-

ered and the supply LEDs on the MTB7671/2 will be on.

To test the RCD plug, lightly press the button on the top (‘Test’

button). The red indicator bars should disappear and the supply

LEDs on the MTB7671/2 go out.

2. SUPPLY POLARITY CHECK

2.1 Supply Pass

The supply polarity check section on the MTB7671/2 should be on,

showing 2 green LEDs.

Do not use the test box unless both of these LEDs are lit.

NOTE: The polarity check will not detect if neutral and earth are

reversed.

3. AC Voltage output

The unit provides connection to the input mains supply to provide

a voltmeter check. The status of this supply is indicated by the

[230 V AC] LED. If this is not lit then the protection fuse has blown

and will need to be replaced.

Connect the tester to the voltage output terminals.

✍- Record the reading on the record card.

4. TESTING A CONTINUITY TESTER

Connect the tester to the continuity and insulation connection sock-

ets in the orange and red section of the test box.

Warning: Do not apply more than 250 mA.

4.1 Current Test

Set the continuity and insulation test select switch to [I TEST] and

perform a continuity test. If the test instrument delivers more than

200 mA the [I TEST] pass LED will light.

✍- Record the reading on the record card.

4.2 Voltage Test

Set the continuity and insulation test select switch to [V TEST] and

perform a continuity test.

If the open circuit voltage from the tester is between 4 V and 24 V dc

the [V TEST] pass LED will light.

NOTE: The MFT1700 will require the buzzer to be turned on during

this test.

✍- Record the reading on the record card.

NOTE: If in either of the tests listed above the LEDs fail to light, the

test instrument under test should be returned for a full calibration.

4.3 0.5 ΩTest

Set the continuity and insulation test select switch to [0.5 Ω] and

perform a continuity check. This connects a resistor between the test

sockets of 0.5 Ω+/-3%. The tester should indicate a measured value

of 0.5 Ω(+/- operational errors including the tester’s accuracy).

✍ - Record the reading on the record card.

4.4 5.0 ΩTest

Set the continuity and insulation test select switch to [5 Ω] and

perform a continuity check. This connects a resistor between the test

sockets of 5 Ω+/-3%. The tester should indicate a measured value of

5 Ω(+/- operational errors including the test instrument’s accuracy).

✍- Record the reading on the record card.

4.5 If an instrument fails the above tests, refer to note 5.6 for reverse

polarity instruments.

5. TESTING AN INSULATION TESTER

Connect the test instrument to the continuity and insulation connec-

tion sockets in the orange and red section of the test box.

Warning: Do not apply more than 1250 V d.c.

5.1 Voltage load test @ 250 V

Set the continuity and insulation test select switch to [250 V] and per-

form an insulation test with the test instrument set to 250 V output.

If the test voltage is 250 V d.c. the [V] LED will be on. If the current

delivered from the unit is greater than 1 mA the [I] LED will also be

on, showing that the test criteria have been met. A fixed resistor of

0.25 MΩ+/-3% is used to provide the test reference. The test instru-

ment should indicate a measured value of 0.25 MΩ(+/- operational

errors including the test instrument’s accuracy).

If either of the LEDs fail to light the test instrument should be re-

turned for a full calibration.

✍Record the reading on the record card.

5.2 Voltage load test @ 500 V

Set the continuity and insulation test select switch to [500 V] and per-

form an insulation test with the test instrument set to 500 V output.

If the test voltage is 500 V d.c. the [V] LED will be on. If the current

delivered from the unit is greater than 1 mA the [I] LED will also be

on, showing that the test criteria have been met. A fixed resistor

of 0.5 MΩ+/-3% is used to provide the test reference. The tester

should indicate a measured value of 0.5 MΩ(+/- operational errors

including the test instrument’s accuracy).

If either of the LEDs fail to light the tester should be returned for a

full calibration.

✍Record the reading on the record card.

5.3 Voltage load test @ 1 kV

Set the continuity and insulation test select switch to [1 kV] and per-

form an insulation test with the test instrument set to 1 kV output.

If the test voltage is 1 kV dc the [V] LED will be on. If the current de-

livered from the unit is greater than 1 mA the [I] LED will also be on,

showing that the test criteria have been met. A fixed resistor of

1 MΩ+/-3% is used to provide the test reference. The tester should

indicate a measured value of 1 MΩ(+/- operational errors including

the tester’s accuracy).

If either of the LEDs fail to light the tester should be returned for a

full calibration.

✍ Record the reading on the record card.

5.4 9 MΩTest

Set the continuity and insulation test select switch to [9 MΩ] and

perform an insulation check using the tester. This connects a

9.0 MΩ+/-3% resistor between the test sockets. This test can be

performed at any voltage up to 1 kV. The tester should indicate

a measured value of 9.0 MΩ(+/- operational errors including the

tester’s accuracy).

✍Record the reading on the record card.

5.5 90 MΩTest

Set the continuity and insulation test select switch to [90 MΩ] and

perform an insulation check using the tester. This connects a 90 MΩ

+/-3% resistor between the test sockets. This test can be performed

at any voltage up to 1 kV. The tester should indicate a measured val-

ue of 90 MΩ(+/- operational errors including the tester’s accuracy).

✍Record the reading on the record card.

5.6 In some instances contintuity and insulation testers have reversed

outputs. If the voltage and current LEDs are not lit when checking

the testers outputs it is recommended that you reverse the polrity

connections i.e. connect the RED test lead to the black continuity/

insulation socket and the BLACK test lead to the RED continuity/insu-

lation socket and repeat the tests.

6. TESTING A LOOP TESTER

Connect the tester to the RCD and loop test supply socket. When

the interlock cover is closed, the earth pin of this socket is connected

to the supply neutral.

Note: The MTB7671/2 can be used to perform either ‘No Trip’ or

‘High Current’ loop tests.

6.1 Conducting a Loop Test

Set the RCD and loop test select switch to [Loop] and perform a loop

test using the tester. This returns a value for the initial test condi-

tions.

✍Record the reading on the record card

6.2 Conducting a +10 ΩLoop Test

Set the RCD and loop select switch to [Loop + 10 Ω] and perform a

loop test using the tester. Check that the loop impedance reading

has increased from the reading in 6.1 by a nominal 10 Ω.

NOTE: allow at least 10 seconds between tests if conducting a high

current loop test.

✍- Record the reading on the record card.

6.3 Conducting a +180 Ωloop test

Set the RCD and loop select switch to [Loop + 180 Ω] and perform

a loop test using the tester. Check that the loop impedance reading

has increased from the reading in 6.1 by a nominal 180 Ω.

✍- Record the reading on the record card.

NOTE: Some 3 wire loop testers give a >50 V touch voltage on this

range. A 2 wire test can be used for calibration checks.

6.4 Performing a PFC test

Set the RCD and loop select switch to [PFC] and perform a loop test

using the tester. The tester will perform a PFC test using

[Loop + 10 Ω] circuit.

NOTE: allow at least 10 seconds between tests if conducting a high

current PFC test.

✍Record the result on the record card

NOTE: The MTB7671/2 performs a real loop test, the test results for

which can vary from test to test, particularly with ‘No Trip’ tests. It

is recommended that several (No Trip) tests are performed and the

average result recorded.

7. TESTING AN RCD TESTER

Connect the tester to the RCD and loop test supply socket. When the

interlock cover is closed, the earth pin of this socket is connected to

the supply neutral.

7.1 Pre-Test Setup

Set the RCD test current on the tester and move the RCD and loop

test select switch to the appropriate position (e.g.10 mA, 30 mA or

100 mA). Check that the “mains socket power on” LED is lit. If not

then press the [reset] button.

7.2 Conducting 1/2 I Test

To perform a 1/2 I test set the tester to 1/2 I mode and perform the

test. The tester should not indicate a tripped RCD (if it does then it

should be returned for a full calibration). This can be repeated for

180° 1/2 I if provided on tester.

- Record the results on the record card

7.3 Conducting an I @ 0° Test

To perform a 0° I test set the tester to 0° I mode and perform the

test. The test box will trip and disconnect power. The [Tripped] LED

will light. The trip time should be a nominal 40 ms.

If the tester fails to indicate a tripped RCD then the tester should be

returned for a full calibration.

✍- Record the reading on the record card.

To reset the test box press the [reset] button in the yellow panel.

7.4 Conducting an I @ 180° Test

To perform a 180° I test set the tester to 180° I mode and perform

the test. The test box will trip and disconnect power. The [Tripped]

LED will light. The trip time should be a nominal 50 ms.

If the tester fails to indicate a tripped RCD then the tester should be

returned for a full calibration.

✍- Record the reading on the record card.

To reset the test box press the [reset] button in the yellow panel.

7.5 Conducting a 5I @ 0° Test

To perform a 0° 5I test set the tester to 0° 5I mode and perform the

test. The test box will trip and disconnect power. The [Tripped] and [5

I TEST] LEDs will light. The trip time should be a nominal 10 ms.

If the tester fails to indicate a tripped RCD then the tester should be

returned for a full calibration.

✍- Record the reading on the record card.

To reset the test box press the [reset] button in the yellow panel.

7.6 Conducting a 5I @ 180° Test

To do a 180° 5I test set the tester to 180° 5I mode and perform the

test. The unit will trip and disconnect power. The [Tripped] and

[5 I TEST] LEDs will light. The trip time should be a nominal 20 ms.

If the tester fails to indicate a tripped RCD then the tester should be

returned for a full calibration.

✍- Record the reading on the record card.

To reset the test box press the [reset] button in the yellow panel.

7.7 Conducting 10 mA, 30 mA and 100 mA tests

The test sequence can be repeated for the 10 mA, 30 mA and

100 mA tests by selecting the appropriate current setting on the RCD

and loop test select switch and repeating the tests as described in

sections 7.2 to 7.6.

NOTE: RCD Protection

In order to protect the current sense circuit the RCD simulator is

protected by a 500 mA fuse. If the fuse blows then the earth pin of

the RCD and loop supply socket will float. If an RCD test is attempted

the fuse blown LED will light. Note that this will only illuminate if the

test instrument does not inhibit testing if the correct voltages are not

present, or the test instrument provides sufficient leakage to light the

LED when connected.

8. Fuse replacement

The MTB77671/2 is protected by two x 500 mA (F) fuses and a 7 A

fuse in the RCD plug. Fuse failure is indicated by either the 230 V

AC LED failing to light or the [Fuse Blown] LED lighting. In the event

of a fuse failing, fuses must be replaced with the same fuse type.

Disconnect the test box from the mains supply. Disconnect any test

instruments from the test box. Remove the failed fuse from the fuse

holder and replace with an identical fuse:

Fuse Type: 500 mA (F) 20 mm

7 A BS1362

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