The Megger® BM25 is a compact,automated 5 kV Insulation Tester,used to carry out Polarization Index
The Megger® BM25 is a compact, automated 5 kV Insulation Tester, used to carry out Polarization Index, Step Voltage and Dielectric Discharge diagnostic tests as well as standard Insulation Test up to 5 TOhms.
Results and test options are shown on a large, clear analogue/digital display for both practicality and precision. The BM25 combines the rapid assessment of changing readings with the precision and clarity of a digital readout. The BM25 also provides an optically isolated RS232 port for the direct downloading of test results.
Features
Automatic testing
Polarized index and step voltage tests voltage tests
RS232 download capability
Insulation resistance measured to 5 T Ohms
Dielectric discharge test for multilayer insulation
Robust field tester, weatherproof to IP54
Large custom display with analog and digital readouts
0 to 90 minute Timer
Holds the CE mark
SPECIFICATIONS
Insulation Resistance Ranges
10 kΩ to 5 TΩ digital
100 kΩ to >1 TΩ
Accuracies (0°C to 30°C)
±5% 1 MΩ to 1 TΩ at 5 kV
From 100 kΩ to 1 MΩ and 1 TΩ to 5 TΩ ±20%
Upper limits reduced pro-rata at lower voltages
For extended temperature range (-20°C to +50°C) percentage error doubles
Test Voltages (D.C.)
500 V, 1000 V, 2500 V, 5000 V and variable in 25 V steps to 5000 V
Test Voltage Accuracy
±5% of nominal for load resistance >10 MΩ
Short Circuit Current
2 mA nominal
Leakage Current
0.01 nA to 999 nA ±5% ±0.2 nA
Capacitance
0.01 μF to 10.0 μF ±15% ±0.03 μF
Voltage measurement
50 V to 1000 V a.c. or d.c. (Does not distinguish between a.c. and d.c.)
Voltage accuracy
±5% ±1V
Interference Rejection
1 mA rms per kV Test Voltage up to 2 mA maximum
Guard terminal
Guards out parallel resistance down to 250 kΩ
Capacitance response
<5 secs/μF to charge to 5 kV
<2 secs/μF to discharge to <50 V
Power Supply
Two rechargeable sealed lead-acid batteries (12 V, 2 Ah). Battery life typically 8 hrs' continuous testing
Built-in charger operates from 95 V to 265 V a.c., recharge time: 8 hrs to 90%, 16 hrs to 100%
Weatherproof
IP54 with charging cover closed
RS232
Optically isolated and protected to IP54
Safety
Maximum continuous overload up to 1 kV rms, Double Insulation to IEC 1010-1 (1992), EN 61010 (1993) to installation category III, 500 V phase to phase and 300 V phase to earth.
EMC
Meets EN 50081-1 and EN 50082-1 (1992) covering both Electromagnetic emissions and susceptibility
Dimensions/Weight
344 mm x 245 mm x 158 mm/5.6 kg
CAT NO.
MODEL
DEscRIPTION
AVAIL
PRICE
BD121021
BM25
ANALOG/DIG 5 kV MEG 500, 1000,2500, 5000 V 5 TOhms
Yes
9,709,200
Automated Insulation Tester — Includes high voltage 3M test lead, mains supply lead for charging, accessory pouch, PC connector lead, 1.8 m long (9 way D female to 9 way D female), BM 25 Download 3 1/2" disk, & test record cards.
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