Megger BMM500 Series Bedienungsanleitung

This instrument is manufactured in the United Kingdom.

The company reserves the right to change the speciﬁcation or design without prior notice.

Part No 6172-697 - Edition 1 - Printed in England - 06FF

AVO INTERNATIONAL

Archcliffe Road PO Box 9007 4271 Bronze Way MEGGER SARL

Dover Valley Forge Dallas 29 Allée de Villemomble

Kent, CT17 9EN. PA 19484-9007 TX 75237-1017 93340 Le Raincy

England. U.S.A. U.S.A. Paris, France

Tel: +44 (0) 1304 502100 Tel: +1 (610) 676-8500 Tel: +1 (800) 723-2861 (U.S.A. only) Tel: +33 (1) 43.02.37.54

Fax: +44 (0) 1304 207342 Fax: +1 (610) 676-8610 Tel: +1 (214) 330-3203 (International) Fax: +33 (1) 43.02.16.24

MEGGER®

User Guide

Guide d’Utilisateur

Benutzeranleitung

Guía del Usuario

INSULATION & CONTINUITY

TESTERS

MEGGER®BMM500 SERIES

Contents

Safety Warnings 2

Description 3

Operation 4

Live Circuit warning 4

Voltage testing 4

Auto-shut off 4

Backlight 4

Insulation tests 5

Locking Test Button (ltb) 5

Polarisation Index Testing 5

Automatic Discharge 6

Zeroing of Test Lead Resistance 7

Possible sources of error 7

Continuity Bleeper 8

Resistance Tests (kΩ)8

Diode Testing 8

Voltage Tests (V) 9

Battery Replacement 10

Fuse Checking and Replacement 10

Using the MEGGER SP1

Switched Probe 11

Speciﬁcation 12

Repair and Warranty 19

Symbols used on the instruments are:

Caution, risk of electric shock.

Caution, refer to User Guide.

Equipment protected throughout

by Double Insulation (Class II).

Equipment complies with

current EU Directives.

Equipment must not be

connected to voltage sources

>600V CAT II. Suitable for

electrical installations CAT III

300V to Earth

>600V

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 must be de-energised 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. Failure to ﬁt the correctly rated fuse will result

in damage to the instrument in the event of an overload.

•Test leads, including crocodile clips, must be in good order, clean and have no broken or cracked

insulation.

•Ensure that hands remain behind guards of probes/clips when testing.

•U.K. Safety Authorities recommend the use of fused test leads when measuring voltage on high energy

systems.

NOTE

THE INSTRUMENTS MUST ONLY BE USED BY SUITABLY TRAINED AND COMPETENT PERSONS

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.

Description

Congratulations on your purchase of a genuine

Megger insulation/continuity tester. Megger has

over 100 years experience in insulation testing

which is reﬂected in its product designs. Your

BMM500 has been carefully developed to

address the real needs and beneﬁts of the user.

The MEGGER BMM500 Series instruments

are battery powered Insulation and Continuity

testers, with a measurement capability from

0,01ΩContinuity to 10GΩInsulation.

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 display is also backlit

giving clear visibility even in low light

conditions.

The BMM500 Series instruments have the

unique capability of being able to measure

voltages down to a resolution of 0,1mV. This

gives the user the option to ﬁt a wide variety of

transducers to further enhance the capabilities

of the BMM Series instruments, eg temperature

or humidity measurement.

A customised connector on the top of the

instrument enables the optional MEGGER SP1

Switched Probe to be used for two handed

probe operation.

The 250V, 500V and 1000V 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 1mA minimum test current at

the minimum pass values of insulation

speciﬁed in these documents. Designed to

IEC1010-1 the BMM500 Series are protected

against connection to a 300V 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

Refer to Safety Warnings before using

the instrument

Testing is automatically inhibited if:

•An external voltage >55V is present when

switched to any insulation range position

•An external voltage >10V is present on all

other ranges (excluding OFF/V).

The external voltage is indicated on the display,

on insulation ranges an audible bleeper will

sound if a test is attempted.

Live Circuit Warning

When more than 25V is applied to the terminals

in the insulation ranges, the instrument defaults

to a voltmeter and gives an audible warning.

On all other switch positions except OFF/V

when approx 10V is applied the default

voltmeter will be activated. Testing will be

inhibited.

Voltage Testing on High Energy Systems

Use extreme care when using or measuring

voltages above 30V, particularly in high energy

systems. Fused test leads are available as

optional accessories for local situations where

increased protection is required.

Auto-shut Off

To conserve battery life, Auto-shut Off

(preceded by a series of bleeps) operates after

approx. 10 minutes of instrument inactivity on

insulation, 5 minutes on all other ranges. If the

instrument is switched on whilst holding the

key, the Auto shut-off time is extended to

60 minutes. To restore operation after Auto-

shut Off, select OFF followed by the required

switch position.

Note: It is recommended that the instrument is

switched to the OFF position when not

in use.

Backlight

The backlight is activated by pressing the

key. The backlight will remain illuminated

for approx. one minute before automatically

switching off to conserve battery life,

∼

Operation

alternatively the key can be re-pressed.

Insulation Tests (MΩ)(See ﬁg. 1)

The insulation tests apply a known voltage to

the circuit under test and measure the resulting

leakage current. The circuit under test must be

completely de-energised and isolated before

test connections are made.

Insulation tests are only initiated when the

TEST button is pressed.

1. Set the range 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. Take the reading.

4. Release the TEST button at the end of the

test.

5. Any capacitive circuits charged during a test

will automatically discharge. If signiﬁcant

voltage remains the voltage warning will

occur and the voltage present displayed.

6. Remove the test leads only when no

voltage is indicated.

Locking Test Button (ltb)

When it is desired to do a long insulation test,

the test can be ‘locked on’by pressing the

key while the test button is held down.

The warning will appear on the display and

both buttons may be released whilst the test

continues. The next press of the test button will

terminate the test.

Note: There is a short delay on the ﬁrst operation

of ‘1000V’ range, each time the range is

selected. This is to prevent accidental

application of 1kV.

Polarisation Index Testing

Polarisation 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

∼

Operation

on PI Testing and value assessment can be

found in AVO International publications listed in

the Accessories page.

Automatic Discharge

When the TEST button is released after an

insulation test (or re-pressed if ltb feature is

enabled), a 200kΩload is automatically

switched across the terminals to discharge the

item under test. Any voltage present will be

indicated on the display so that the discharge

can be monitored.

Typical Terminal Voltage Characteristics

Continuity Testing (Ω)(See ﬁg.2)

The continuity tests are activated when the

probes make contact of less than a few kΩ. The

tests apply a constant current and measure the

resulting volt drop across the circuit under test.

The test operates without the need to press the

TEST button. When the test leads are removed

Fig.1

1100

1000

900

800

700

600

500

400

300

200

100

0.01 0.1 1 10 100 1000

1000V

500V

250V

RESISTANCE (MΩ)

VOLT (d.c.)

Operation

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.

1. Set the selector switch to Ω.

2. Connect the test leads.

3. The test will activate automatically.

4. After the test probes are disconnected, the

reading will be held for a few seconds.

Zeroing of Test Lead Resistance

The resistance of the test leads can be nulled

on the continuity range (up to 9,99Ω). The null

information is retained in non-volatile memory

and so will be remembered when the

instrument is switched off.

1. Select the Continuity range.

2. Short the test leads across a known good

conductor using prods.

3. When the reading has stabilised, press the

TEST button. The zero offset symbol

will appear.

4. To release the zero offset press the TEST

button again.

Possible sources of error

Measurements and results can be effected by

the following:

•The impedance of operating circuits

connected in parallel

•Impedance such as inductors that vary during

the measurement

•A poor connection to the circuit under test.

Fig.2

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