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Megger BM121
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Digital Hand-Held Megger Insulation Tester; 500 V


  • Tests insulation at rated voltage into a 1 mA load
  • 200 mA short circuit continuity current
  • Automatic discharge of circuit under test
  • Visual warning of energized circuits above 25V
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Megger BM121

Megger BM121 500V Digital Insulation & Continuity Tester Megger BM121

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Product Information

The Megger® BM120 Series of Digital Insulation and Continuity Testers offers a cost effective solution to testing where only basic test facilities are required. Instruments are available with single insulation test voltages of 500V DC or 1000 V DC. and test results are displayed on a clear 3-digit autoranging liquid crystal display. Full rated test voltage is produced when supplying up to 1 mA load.

Both instruments offer hands free continuity measurement with a short circuit current of greater than 200mA and an open circuit voltage of 5 V. If either instrument is connected to a system which is energized to greater than 25 V, a warning symbol on the display will flash. Under this condition an insulation or continuity test cannot be carried out and the instrument will therefore automatically inhibit any further action until the source of voltage has been removed.

Although insulation tests should only be carried out on de-energized systems, the instruments are protected against accidental connection to phase to earth voltages up to 300 V AC and phase to phase voltages of 440 V AC, Installation Category III. Further indicators illuminate to show a low battery state and if the protective fuse has ruptured. The instruments will automatically shut down after 5 minutes of non use.

What's In The Box

  • 1 - User Guide
  • 1 - Test lead set
  • 1 - Pouch


Insulation Ranges  
Voltage (DC): 500V
Measuring Range: 0.01 m-Ohm to 999 m-Ohm
Terminal Voltage on Open Circuit: -0% +30% of rated voltage
Short Circuit Current: 2 mA
Test Current on Load: 1 mA minimum pass values of insulation
Accuracy: ±3% of reading ±2 digits up to 10 m-Ohm
±5% of reading ±2 digits up to 100 m-Ohm
±30% of reading up to 999 m-Ohm
Voltage Warning: Symbol flashes on the display in the presence of more than 25V AC or DC
Continutiy Ranges  
Measuring Range: 0.01 ohms to 9.99 ohms
10.0 ohms to 99.9 ohms
Open Circuit Voltage: 5V ±1V DC
Short Circuit Current: 0.01 ohms to 9.99 ohms 210mA
10.0 ohms to 99.9 ohms 21mA
Accuracy: 0.01 ohms to 9.99 ohms ±3% ±2 digits
10.0 ohms to 99.9 ohms ±5% ±2 digits
Battery Condition: If the battery condition becomes low during a test, a symbol will illuminate on the display
Auto Shut Off: The instrument will automatically switch off after 5 minutes of inactivity
Fuse: The instrument is fitted with 500mA (F) 440V ceramic 32mm x 6mm. HBC 10 ka fuse
Temperature Range: -20°C to 60°C up to 100 m-Ohms
-20°C to 40°C over full range
Storage Temperature: -25°C to 65°C
Operating Humidity: 90% Relative Humidity at 40°C maximum
Power Supply: 6 x 1.5 V cells IEC LR6 type
Dimensions 5 (H) x 1 (W) x 2.4 (L) in.
195mm (H) x 40mm (W) x 98mm (L)
Weight Approximately 530g (1.16 lbs)



ManualsSpec Sheets


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