Megger BM80/2 Series Manuale utente

BM80/2 Series

Multi-Voltage Insulation and Continuity Tester

User Guide

Guide de l’utilisateur

Gebrauchsanleitung

Guía del usuario

Contents

Safety Warnings 2

Notes 3

General Description 4-5

Operation

Testing is automatically inhibited if... 6

Voltage testing on high energy systems 6

Auto-shut Off 6

Insulation Tests (MΩ)7

Polarization Index Testing 7

Continuity Testing (Ω) 8

Continuity Bleeper ( ) 8

Zeroing of Test Lead Resistance 8

Resistance Tests (kΩ)9

Voltage Tests (V)9

Live Circuit Warning 9

Battery Check ( )10

Battery Replacement 10

Fuse Checking and Replacement 10

Application Notes

Preventive Maintenance 11

Insulation Testing Concepts 12-13

Speciﬁcation 14-17

Typical Terminal Voltage Characteristics 18

Accessories 19

Repair and Warranty 20

Mode d’emploi 22 - 43

Betriebsanleitung 44 - 65

Instrucionnes de Uso 66 - 87

SAFETY WARNINGS

•Safety Warnings and Precautions must be read and understood before

the instrument is used. They must be observed during use.

• The circuit under test mustbe de-energized and isolated before

connections are made except for voltage measurement.

• Circuit connections must not be touched during a test.

• After insulation tests, capacitive circuits must be allowed to discharge

before disconnecting the test leads.

• The Live Circuit Warning and Automatic Discharge are additional safety

features and should not be regarded as a substitute for normal safe

working practice.

• Replacement fuses must be of the correct type and rating.

• Test leads, including crocodile clips, must be in good order, clean and

have no broken or cracked insulation.

• U.K. Safety Authorities recommend the use of fused test leads when

measuring voltage on high energy systems.

NOTE

THIS INSTRUMENT MUST ONLY BE USED BY SUITABLY TRAINED AND COMPETENT PERSONS.

Notes

BEFORE USING THE INSTRUMENT,follow

the separate instructions provided to ﬁt either

the locking or non-locking test button. Megger

Limited recommend the ﬁtting of the non-

locking test button. Hands free operation is

provided on all ranges except the insulation

ranges. If the locking button is ﬁtted, extra care

must be taken.

Symbols used on the instrument:

Risk of electric shock.

Refer to User Guide.

Equipment protected throughout by

Double Insulation (Class II).

Equipment complies with current EU

Directives.

NOTE

Users of this equipment and or their employers are reminded that Health and Safety Legislation require 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 from inadvertent short circuits. Where the assessments show that the risk

is signiﬁcant then the use of fused test leads constructed in accordance with the HSE guidance note GS38

‘Electrical Test Equipment for use by Electricians’ should be used.Users of this equipment and or their

employers are reminded that Health and Safety Legislation require 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

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

test leads constructed in accordance with the HSE guidance note GS38 ‘Electrical Test Equipment for use by

Electricians’ should be used.

General Description

The BM80/2 Series instruments are battery

powered Insulation and Continuity testers, with a

measurement capability from 0,01 ΩContinuity

to 200 GΩInsulation.

Offering multi-voltage facilities, the instruments

take full advantage of microprocessor

technology and feature a large liquid crystal

display combining digital and analogue

readings. The analogue display has the beneﬁt

of indicating trends and ﬂuctuations in

readings, while the digital readout gives direct

accurate results.

The BM80/2 Series instruments have the

unique option of either a locking or non-locking

button which is user selected. The chosen test

button is easily pushed into the instrument

casing without the use of a tool. The procedure

for inserting the test button is provided on the

separate instruction sheet included with the

test buttons.

Acustomized connector on the top of the

instrument enables the optional Megger SP6F

Switched probe to be used for two handed

probe operation.

The TEST button is used to initiate the

insulation tests, for operating the null facility

and for adjusting the auto shut-off time. Grey

markings on the range label denotes when the

use of the TEST button is necessary. All other

tests (Voltage, Continuity and Resistance)

have the advantage of hands free operation

and are activated when the probes make

contact.

The 250 V, 500 V and 1000 V ranges can be

used to test electrical installations in

compliance with BS7671 (16th Edition IEE

Wiring Regulations) IEC364 and HD384, since

each range has a 1 mA minimum test current

at the minimum pass values of insulation

speciﬁed in these documents. The 100 V

range is ideal for testing telecommunications

equipment which would be damaged by higher

voltages. The 50 V range is useful for testing

sensitive equipment, such as electronic

components, and computer peripherals.

Available as an optional accessory, the

Megger DLB Downloading Base can be ﬁtted

for realtime downloading of measured test

General Description

results to a Palmtop, Laptop or Personal

computer via an RS232 serial lead. The

optional miniature clip-on current transducer

MCC10 enables the instrument to measure

a.c. currents from 1 A to 10 A.

Instrument power is supplied by six 1,5 V

alkaline battery cells, which are constantly

monitored. When battery power is nearly

exhausted, the symbol appears on the

display. Remaining battery life can be

monitored at any time using the battery check

switch position. This is beneﬁcial before going

on-site, to ensure enough battery power for the

day’s work.

Designed to IEC1010-1 the BM80/2 Series

are protected against connection to a 440 V

Category III supply. The instruments have a

basic accuracy of ± 2% at 20 °C.

The instruments are waterproof and dustproof

to IP54. This helps maintain accuracy and

ensures maximum reliability in harsh

environments.

Operation

Testing is automatically inhibited if......

•An external voltage >55 V is present when

switched to any Insulation position above

50 V.

•An external voltage >25 V is present on all

other ranges (excluding Voltmeter

position).

The external voltage is indicated on the display

and the bleeper sounds intermittently.

Voltage Testing on High Energy Systems

Use extreme care when using or measuring

voltages above 30 V, particularly in high

energy systems. Fused test leads are available

as optional accessories. These are strongly

recommended for use when making voltage

tests. (GS38 H.S.E document).

Auto-shut Off

To conserve battery life, Auto-shut Off

(preceded by a series of bleeps) operates after

12 minutes of instrument inactivity in all

insulation test switch positions, and after 5

minutes of instrument inactivity in all other

switch positions. If desired, the 5 minute shut-

off can be changed to 60 minutes (non

insulation test switch positions). To do this, ﬁrst

perform a battery check, then press the TEST

button twice to show (➔60).

If an insulation test, or OFF is subsequently

selected, the shut-off time reverts to the default

times. It is therefore not possible to generate

dangerous voltages for more than 12 minutes,

even with a locking test button.

To restore operation after Auto-shut Off, select

OFF followed by the required switch position.

Note: Auto-shut Off has a small power

consumption and it is recommended that the

instrument is switched to OFF when not in use.

This is particularly important at the end of the

working day, since no battery power is used in

the OFF position.

The circuit under test must be completely de-energized

and isolated before test connections are made.

Operation

Insulation Tests (MΩ)

Insulation tests operate only when the TEST

button is pressed. (See the separate

instructions for ﬁtting the TEST button). These

tests produce high voltages at the terminals

and are initiated when the TEST button is

pressed. When the TEST button is released,

the reading will be held for a few seconds, the

item under test will automatically be

discharged, and the capacitive charge decay

shown on the Live Circuit Warning voltmeter.

When the 1 kV range has been selected

(BM80/2 &BM82/2 only) and the TEST

button pressed, there will be a safety delay of

3seconds and ‘1000 V’will ﬂash before the

test voltage is applied. This delay only occurs

as a warning the ﬁrst time that the button is

pressed after the range has been selected.

The delay will not occur on subsequent tests.

1. Set the selector switch to the test

voltage required.

2. Connect the test leads, ﬁrst to the

instrument, and then to the isolated

item under test.

3. Press the TEST button to activate the test

voltage.

4. Release the TEST button at the end of the

test. The reading will hold for a few

seconds.

5. Any capacitive circuits charged during a

test will automatically discharge. If

signiﬁcant voltage remains the voltage

warning will occur.

6. Remove the test leads only when no

voltage is indicated.

Polarization Index Testing

Polarization Index (PI)is the term applied to

the Dielectric Absorption Ratio when

resistance values are measured after 1 minute

and again after 10 minutes. Polarization Index

is then the resistance value after 10 minutes

divided by the resistance value after 1 minute.

The test can be run at any voltage.

More detailed information on PI Testing and

value assessment can be found in Megger

Limited publications listed in the Accessories

page.

Continuity Testing (Ω)

(BM80/2 &BM81/2 only)

The continuity tests are activated when the

probes make contact. The test operates

without the need to press the TEST button.

When the test leads are removed the reading

will hold for a few seconds and then reset.

This range is not suitable for diode testing

since the automatic contact detector will not be

activated when connected to a diode. The kΩ

range can be used for diode testing.

1. Set the selector switch to Ω.

2. Connect the test leads. The pointer will

appear when connection to <10 MΩis

made.

3. The test will activate automatically.

4. After the test probes are disconnected, the

reading will be held for a few seconds.

Continuity Bleeper ( )

(BM80/2 &BM81/2 only)

The continuity bleeper sounds continuously

when less than 5 Ωis detected. Short bleeps

will sound for resistances lower than a few kΩ

and above 5 Ω.If contact to less than 5 Ωis

maintained for ﬁve seconds, the bleeper stops,

and the display shows the measured

resistance.

1. Set the selector switch to .

2. Connect the test leads.

Zeroing of Test Lead Resistance

(BM80/2 &BM81/2 only)

The resistance of the test leads can be nulled

on the continuity ranges. To zero the

resistance (up to 9,99 Ω), short the test leads

together, wait for a stable reading, and press

the TEST button. The symbol will appear to

indicate the zero has been adjusted.

1. Select either Continuity range.

2. Short the test leads across a known good

conductor.

3. When the reading has stabilized, press the

TEST button. A short ‘bleep’ will sound

and the zero offset symbol will appear.

4. To release the zero offset press the test

button again or switch the instrument off.

Operation

Resistance Tests (kΩ)

This is a low voltage (5 V) low current (20 µA)

test for sensitive electronic equipment. It

operates in the same way as the continuity

ranges. This range can be used for diode

testing.

1. Set the selector switch to kΩ.

2. Connect the test leads.

3. The test will activate automatically.

Voltage Tests (V)

The measured a.c. or d.c. voltage is indicated

on the display. The analogue scale display can

be toggled between the default range of 0 to

500 V (1 V resolution) or the 1 to 50 V (0,1 V

resolution) range by pressing the TEST button.

When a.c. volts are detected the ----- symbol

will appear next to the 'V'. The presence of

negative d.c. is indicated by '-dc'on the

display, but no reading is given.

If the voltmeter operation is in question, test the

voltmeter on a known source.

1. Set the selector switch to V.

2. Connect the test leads.

3. After a short settle time,the reading will be

displayed automatically.

Live Circuit Warning

When more than 25 V is applied to the

terminals, the instrument defaults to a

voltmeter on all switch positions except OFF

and Battery Check. In addition, the audible

bleeper will sound on all switch positions

except OFF and V.All selected tests will be

inhibited except for Insulation tests of 100 V

and above, which will remain available until the

voltage exceeds 55 V.

Note: If the 500 mA fuse has ruptured, the

voltmeter will continue to operate for voltages

greater than 100 V at 50 Hz.

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