Megger MJ15 Specifications
Analogue 5 kV Insulation Tester
BM15 MJ15
Analogue 5 kV Insulation Tester
■ Four test voltages to 5 kV
■ Dual power supply option giving the best
of both worlds
■ Resilient mounted analogue scale for
robustness
■ Voltage range to 600 V indicates auto
discharge
■ Pass/fail overlays for rapid testing
■ Single scale for insulation values to avoid
operator error
BM15 MJ15
DESCRIPTION
The Megger®BM15 & MJ15 are compact 5 kV insulation
testers. They are very simple to use and provide a quick
and accurate reading of insulation resistance. The
instruments use an analogue display with a maximum
reading of 20 GΩ. The BM15 is powered by batteries. The
MJ15 has an additional hand-cranked generator.
The instrument operation is extremely simple. A voltage
range enables measurement of a.c. or d.c. conductor
potential. Four test voltages are available at 500 V, 1 kV,
2,5 kV and 5 kV. A choice of push buttons is supplied; a
locking button simplifies long term testing, or a nonlocking version is preferred for maximum safety.
A bezel allows a scale plate overlay to be added with
pass/fail bands for go/no go testing. This is particularly
useful for less experienced users and enables a rapid
decision to be made.
The new instruments have a choice of power source. The
BM15 is powered by 8 x LR6 (AA) alkaline cells. The MJ15
comes with a hand cranked generator plus batteries. If the
test button is pressed the MJ15 uses battery power.
Otherwise the crank handle is turned to save battery
power or for use when the batteries are unavailable.
Both units are built into a rugged case designed for
outdoor use. The instruments are also supplied with a soft
carrying case, a test lead set, test record cards and
batteries.
Safety terminals suitable for locking connectors are used
for connection to the test piece. An automatic discharge
circuit eliminates the voltage on capacitive loads after a
test. The decaying voltage can also be viewed on the
scale.
Fused test leads are available as an option for voltage
measurement. The instruments meet the IEC1010 safety
specification and EMC specifications and are fully CE
marked.
FEATURES
■ Large, single scale analog display
■ Auto voltage measurement function indicates conductor
and auto discharge potential
■ Supplied with optional locking test button
■ Safety recessed terminals and long connectors
■ Four output test voltages
■ Simple to use
■ CE marked
■ Dual power supply option on MJ15
■ Unique scale overlay for pass/fail bands
■ Resilient mounted analogue scale for robustness
■ Single scale for insulation values to avoid operator error
■ Light weight and rugged
■ Range down to 100kΩ ideal for go/no go testing
BM15 MJ15
Analogue 5 kV Insulation Tester
APPLICATIONS
Insulation is important for the safety of all electrical
systems, providing a barrier to hazardous live conductors.
Insulation can deteriorate due to the affects of moisture,
sunlight and heat. A reduction in the value of insulation
resistance can lead to a potentially dangerous situation
caused by the dangers of electric shock, or arcing causing
fire. If insulation resistance is regularly monitored
unusually low values can be investigated before they
cause danger, or inconvenience and cost due to
equipment downtime for repairs.
The BM15 & MJ15 are general purpose, 5 kV insulation
testers for electrical contractors and engineers who test
machinery, transformers, switchgear, cables, etc.
This Product is used by:
■ Electrical Contractors
■ Maintenance Engineers
■ Telecommunications Engineers
■ Gas and Water Utilities
■ Railway Companies
■ Cable Manufacturers
■ Mining Companies
SPECIFICATION
Insulation Range:
100 kΩ to 20 GΩ (also 0 Ω and ∞)
Test Voltages (d.c.)
500 V, 1000 V, 2500 V & 5000 V
Test Voltage Accuracy
±5% of nominal test voltages on 20 MΩ load
Test Voltage Stability
<±1% (180 r.p.m. to 240 r.p.m. MJ15)
Insulation Accuracy (at 0 - 30˚C) (32 to 86˚F)
±2,5% of full scale deflection
Short Circuit Current
1,5 mA ± 0,5 mA
Maximum capacitance of load
5 µF
Interference Rejection
1 mA rms at 50 to 60 Hz
Discharge Resistor
<500 kΩ
Voltage RANGE
Range
0 to 600 V a.c.
Indication of d.c.
Accuracy
± 2,5% f.s.d. a.c.
(with rotary switch in the V position)
General
Overload rating
720 V a.c. or d.c.
Scale Length
2,8 in. (72 mm) (96˚)
Power Supply
BM15
8 x AA cells (LR6)
MJ15
Low voltage brushless Generator and 8 x AA cells (LR6)
Battery Life
Typically 2000 five second tests at 5 kV on 100 MΩ load
Battery Indicator
Loaded battery test
Safety
Meets the safety requirements for double insulation to IEC 1010-1
(1995) EN61010 (1995) to installation Category III***, 300 V phase
to earth (ground) or 600 V Category I*
***Relates to transient overvoltage likely to be found in fixed
installation wiring.
*Relates to transient overvoltage likely to be found in special
equipment or parts of equipment, telecommunication, electronic
etc.
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