BM80/2 SERIES

Multi-Voltage Analogue/Digital Insulation and Continuity Testers

BM80/2 Series
Multi-Voltage Analogue/Digital
Insulation and Continuity Testers
■ Fully complies with the requirements of
BS 7671, HD 384 and IEC 364
■ Multiple insulation test voltages from
50 V to 1000 V d.c. (according to model)
■ Remote control switched probe option
■ Optional RS232 port
■ Optional current clamp accessory
■ Waterproof and dustproof to IP54

DESCRIPTION
The Megger® BM80/2 Series are multi-voltage insulation analogue scale. Due to the low test voltage and current of
and continuity testers offering advanced performance, this range, it can be used to test circuits with sensitive
specification and features, and simplicity of use. They have equipment connected, without causing damage.
insulation test voltages from 50 V to 1000 V d.c., (500 V Two voltage ranges measure up to 50,0 V and 600 V a.c. or
max. on BM81/2.) The comprehensive specification is d.c. respectively, and indicate the presence of negative
achieved using the latest electronic design and technology. d.c. A voltage warning is provided in these models,
The analogue/digital LCD incorporates the benefits of alerting the user to the presence of external voltage
electronic arc analogue indication with unambiguous greater than 25 V, by displaying the voltage level, even
digital readings. The analogue scale helps to make rapid when measuring on insulation and continuity ranges. The
identification of insulation condition, and to monitor voltage range will indicate if capacitive charge remains
variable readings, and is complemented by the precision after a test, and will monitor the automatic discharge.
and simplicity of a digital display. All 3 instruments in the On all models testing is inhibited if 55 V is detected.
range are identical except that the BM81/2 has a maximum
test voltage of 500 V and the BM82/2 has no continuity Hands free operation is offered as standard on all ranges
range. except the insulation ranges. Locking and non-locking test
buttons are provided with each instrument for user
In compliance with BS 7671, IEC 364, HD 384 and VDE selection. Use of the non-locking button is recommended
0413 Part 1 and 4, the 250 V, 500 V and 1000 V insulation to prevent accidental mis-use and injury, and in cases
ranges have a 1 mA test current at the minimum pass where continuous operation of an insulation test is
values specified. The BM80/2 and BM81/2 continuity required the locking button can be fitted. Alternatively the
ranges have a short circuit test current of approximately optional accessory Switched Test Probe SP1 can be used
205 mA in order to comply with the requirements of these enabling remote operation of the test button from the
documents. Also on the continuity ranges, is the facility to negative test probe.
null the resistance of the test leads.
The BM80/2 series is rugged, and therefore suited to tool
This enables direct readings of low resistance to be taken. bag treatment, as well as having an IP54 environmental
A continuity buzzer is included on the second continuity protection rating which ensures product reliability in wet
range. and dusty conditions. Exceptional battery life is provided
In addition to the insulation and continuity ranges, the by six cells housed in separate battery compartment. The
BM80/2 series has a resistance range which measures up instruments are designed to IEC 1010-1, VDE0411 and
to 100 kΩ on the digital scale and up to 10 MΩ on the BS4743 safety standards.
 BM80/2 SERIES
Multi-Voltage Analogue/Digital Insulation and Continuity Testers

Model Selection Chart

Insulation Test Voltage Cont
50 100 250 500 1000 Range
BM80/2 ✓ ✓ ✓ ✓ ✓ ✓
BM81/2 ✓ ✓ ✓ ✓ ✘ ✓
BM82/2 ✓ ✓ ✓ ✓ ✓ ✘

ELECTRICAL CONTRACTORS
The BM80/2 series, designed for flexibility and versatility, has a wide variety of applications and is ideal for testing
electrical installations to the British and International Wiring Regulations. Each instrument in the series conforms to the
requirements of Table 71 A in BS 7671, and to VDE 0413 parts 1 and 4, HD384 and IEC364.
The BM80/2 series can be used in both the domestic and industrial contracting environments. Test voltages of 250 V,
500 V and 1000 V d.c. are available. A 250 V insulation test voltage is necessary to test low voltage circuits supplied by an
isolating transformer. 500 V d.c. is the most commonly required voltage, since it is used to test all circuits except low
voltage circuits with a nominal voltage up to and including 500 V. The 1000 V d.c. test voltage is used on circuits with a
nominal voltage greater than 500 V and less than 1000 V.
The continuity ranges can be used to test the continuity of protective and ring final circuit conductors, and the polarity of
the conductors.
The BM80/2 series instruments can also be used for insulation and continuity tests on transformers, motors, generators,
domestic appliances, power tools, such as electric drills, and many other pieces of electrical equipment.
On high energy systems it is recommended that test leads with fused prods are used when measuring voltage. These are
available as an optional accessory.
SERVICE ORGANISATIONS
The BM80/2 series is ideal for use by Service Organisations due to the wide range of parameters which can be measured
with the instrument and its associated optional accessories.
The insulation test ranges are available for establishing the integrity of the insulation of internal parts such as motors and
transformers, as well as other equipment, and the continuity ranges can be used for circuit tracing and operational
checking of switches, etc.
With the resistance range measuring up to 100 kΩ on the digital display, and 10 MΩ on the analogue scale, basic
components such as resistors, capacitors and diodes can be tested for functionality.
Two voltage ranges (1-50,0 V and 0-600 V a.c./d.c.) enable internal mains voltages and power supply rail levels to be
measured, and with the addition of the MCC10 optional Current Clamp, appliance current consumptions can be measured
and compared to the rating plate.
These unique features offer measurement ranges and facilities not normally found in an Insulation Tester and could
therefore reduce the number of test instruments required by the Service Engineer.
ADVANCED APPLICATIONS
The addition of the DLB1 RS232 communication base will enable the BM80/2 family to produce a continuous output of
information corresponding to the value which is shown on the instrument display. The DLB1 is supplied complete with
DATA software which will enable the test information to be transferred to an IBM compatible computer.
This opens up applications for continuous monitoring of insulation resistance for the advanced user who may wish to
use the results for calculating Dielectric Absorption Ratios including Polarisation Index. The Polarisation Index Ratio is
defined as the ratio between insulation resistance values measured after 1 minute and 10 minutes; it is useful for
determining insulation quality without the need for temperature compensation or necessary referral to historical test
information.
The DLB1 when used in conjunction with the SP6F can also facilitate limited remote operation of the BM80/2 series for
applications where the product may need to be permanently installed in or near a piece of equipment.
TELECOMMUNICATIONS APPLICATIONS
In addition to the Installation Testing capabilities of the 1000 V, 500 V and 250 V insulation test ranges the BM80/2 series
incorporates 100 V and 50 V testing facilities. These low voltage insulation tests enable the instrument to be used for
checking delicate components and equipment which would otherwise be damaged by higher voltages.
The instruments are designed to perform insulation tests on systems with up to 55 V of electrical interference, or
 BM80/2 SERIES
Multi-Voltage Analogue/Digital Insulation and Continuity Testers

crosstalk, without the accuracy or reliability of results Open Circuit Voltage: 5 V, ±1 V

being effected and with no damage to the instrument. Short Circuit Current: 20 µA, ±5 µA Accuracy (at 20°C):
A wide resistance measuring capability across the ranges ±3%, ±2 digits
enables a degree of cable fault pre-location to be VOLTAGE RANGE
performed by using resistance to fault methods, and the wide Measuring Range
voltage measuring capability allow accurate measurement of (i) 0 - 600 V a.c./d.c.
line and battery voltages.
(ii) 1,0 - 50,0 V a.c./d.c.

SPECIFICATIONS
INSULATION RANGES Accuracy (at 20° C)
Nominal Test Voltage (d.c.):
0-600 V Range <450 V a.c. (50/60 Hz) and d.c. ±1%, ±2 digits
50 V, 100 V, 250 V, 500 V and 1000 V
>450 V a.c. (50/60 Hz) and d.c. ±2%, ±2 digits
(1000 V not available on BM81/2.)
<450 V a.c. 400 Hz: ±5%, ±2 digits
Measuring Range
1,0 - 50,0 V Range a.c./d.c. ±2%, ±3 digits
50 V range: 0–10 GΩ
100 V range: 0–20 GΩ TEMPERATURE COEFFICIENT
250 V range: 0–50 GΩ <0,1% per °C on all ranges.
500 V range: 0–100 GΩ DEFAULT VOLTMETER
1000 V range: 0–200 GΩ The default voltmeter operates when an external voltage >25 V
Resolution: 0,01 MΩ a.c. or d.c. is detected on any range except OFF and . If this
voltage exceeds 55 V then insulation testing will be inhibited.
Terminal Voltage on Open Circuit (d.c.): +15% maximum Reverse polarity d.c. will cause ‘-d.c.’ to appear on the DISPLAY.
Test Current BATTERY CONDITION TEST
1 mA minimum at the minimum pass values of insulation If the batteries are low during a test, the symbol will
specified in BS 7671 (formerly the 16th Edition IEE Wiring appear automatically. The batteries can also be checked by
Regulations)on the 250V, 500 V and 1000 V ranges. selecting the battery condition test position. This will indicate the
50 V range: 0,2 mA at 250 kΩ result as volts and as a bar.
100 V range: 0,4 mA at 250 kΩ AUTO SHUT-OFF
Accuracy (at 20°C) The instrument auto shut off operates 5 minutes after the start of
a test, on all ranges, except the insulation ranges where it
50 V range: ±2% ±2 digits ±4% per GΩ operates after 12 minutes. This can be adjusted to 60 minutes for
100 V range: ±2% ±2 digits ±2% per GΩ the voltage, continuity and KΩ ranges. Selecting an insulation
250 V range: ±2% ±2 digits ±0,8% per GΩ range or off will revert the shut-off to 5 minutes.
500 V range: ±2% ±2 digits ±0,4% per GΩ
1000 V range: ±2% ±2 digits ±0,4% per GΩ
GENERAL SPECIFICATION
Operating Range -20 - +40°C
Operating Humidity 90% R.H. at 40°C max.
Storage Range -25 - +65°C
Environmental Protection IP54
Fuse
Type
500 mA (F) 440 V, 32 x 6 mm Ceramic HBC 10 kA minimum.
Glass fuses must not be fitted.
Indication of a ruptured fuse is provided by the symbol .
Typical Terminal Voltage Characteristics:
Safety
The instruments meet the requirements for double insulation to
CONTINUITY RANGES (not BM82/2) IEC 1010-1 (1995), EN61010-1 (1995) to Category III, 300 V phase
Measuring Range: 0,01 - 99,9 Ω to earth (ground) and 440 V phase to phase. Over voltage
(0-50 Ω on analogue scale) measuring facilities exist to indicate capacitive discharges.

Open Circuit Voltage: 5 V, ±1 V FUSE PROTECTED TO 440 V.

Short Circuit Current: 205 mA, ±5 mA INSTALLATION CATEGORIES

Accuracy (at 20° C) ±2%, ±2 digits Category III: Fixed wiring and installations within a building.
Zero Offset Adjust: 0 - 9,99 Ω
AUTOMATIC DISCHARGE
Continuity Buzzer Operates at less than 5 Ω approx.
When the test button is released after an insulation test the item
RESISTANCE RANGE under test will be discharged automatically. Any voltage present
(can be used for diode testing) will be indicated on the display so that the discharge can be
Measuring Range: 0,1 - 100 kΩ (0 - 10 MΩ on monitored.
analogue scale)
 BM80/2 SERIES
Multi-Voltage Analogue/Digital Insulation and Continuity Testers

POWER SUPPLY Accuracy: ±2%

Battery Type 6 x 1,5 V cells IEC LR6 type only. Operating Temperature: -10°C to +50°C <75% RH
Battery Life 3000, 5 second operations, at 1 kV worst Storage Temperature: -20°C to +75°C
case
Type of Sensing: Induction coil for a.c. current
Weight 625g (1,377 lbs approx.)
Max. Output Impedance: 75Ω
Dimensions 220 x 92 x 55 mm
EMC
(5,5 in x 2,33 x 2,16 in approx.)
In accordance with IEC61326 including Amendment No.1
EMC
Max. Conductor Size: 15 mm dia. cable, or a
In Accordance with IEC61326 including Amendment No.1
15 mm x 17 mm busbar.
Size (without leads):- 43 mm x 23 mm x 94 mm
Weight: 105 g

DLB1
The DLB1 optional accessory communication interface provides
an RS232 serial data output simultaneous to the displayed
readings.
SP6F When used in conjunction with the DATA software provided and
an IBM-compatible PC, long-term insulation monitoring and data
The SP6F switched probe is available as an optional accessory. By storage are possible.
simply plugging the standard red positive lead into the
instrument, and with the switched test probe inserted into a DATA also enables test data to be presented in tabular form and
unique socket on the top of the insulation tester, tests can be facilitates the printing of certificates.
made by pressing the remote switch on the probe.
This remote operation significantly increases the ease of use of SPECIFICATION
the product and reduces the time taken to perform a test.
Baud Rate: 9600
Operating Range: -20°C to +40°C
SPECIFICATION
Operating Humidity: 90% RH @ 40°C max.
Operating Temperature Range: -20°C to +40°C Storage Temperature Range: -25°C to +65°C
Operating Humidity: 90% RH @ 40°C max. Safety:
Storage Temperature Range: -25°C to +65°C Meets the safety requirements for double insulation to
Protection: IP54 IEC1010-1(1995) EN61010-1(1995) to Cat. III, 300 V phase
to earth (ground) and 500 V phase to phase.
Safety
Meets the safety requirements for double insulation to E.M.C.
IEC1010-2-31 (1995) EN61010-2-31 (1995) IEC1010-1 (1995) In accordance with IEC61326 including Amendment No.1
EN61010-1 (1995) Category III, 300 V phase to earth and 500 V Dimensions: 94 mm x 46 mm x 42 mm
phase to phase. Weight: 80 g
Weight: 155 g
ORDERING INFORMATION
MCC1 Item (Qty) Order Code
Multivoltage Insulation & Continuity Testers BM80/2
The MCC10 Current Clamp will connect to the instrument test
(no 1000 V range) BM81/2
leads and enable direct indication of a.c. current to be displayed
on the 50,0 V measuring range. Measurement in the range of (no continuity range) BM82/2
1,0 A to 10,0 A a.c. can be made, with overload up to 16 A at Included Accessories
marginally reduced accuracy, and the clamp will span a Test lead set 6220-437
conductor of 15 mm. This current measuring feature, not Test & carry case 6420-112
normally associated with insulation testers, greatly enhances the
User Guide 6171-188
product versatility and further increases the applications for
Electrical Contractors, Utilities and Service Organisations. Optional Accessories
Fused lead set FPK8 6111-218
SP6F 6220-836
SPECIFICATION
MCC10 6111-290
Current Range: 1,0 A to 10 A a.c. R.M.S DLB2 6220-602
Output Voltage: 1 V a.c. per 1 A a.c. Test record card (Pack of 20) 6111-216

UK UNITED STATES OTHER TECHNICAL SALES OFFICES Registered to ISO 9001:2000 Reg no. Q 09290
Archcliffe Road Dover 4271 Bronze Way Norristown USA, Toronto CANADA, Registered to ISO 14001 Reg no. EMS 61597
CT17 9EN England Dallas TX 75237-1088 USA Mumbai INDIA, Trappes FRANCE,
BM80_2_DS_en_V11
T +44 (0) 1304 502101 T 800 723 2861 (USA only) Sydney AUSTRALIA, Madrid SPAIN
F +44 (0) 1304 207342 T +1 214 333 3201 and the Kingdom of BAHRAIN.
www.megger.com
F +1 214 331 7399
Megger is a registered trademark