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Megger ®
BM11, BM11D Series
5 kV Analog/Digital Insulation Testers		  
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Megger BM11 and BM11D Insulation Testers
 
  Characteristics:  
 
 
  • BM11
    • Choice of test voltages
    • Direct reading display
    • Unique rugged case
    • Guard terminal
    • Large direct reading analog scale
    • Guard terminal
    • Rugged case design
    • 123 mm scale length
  • BM11D
    • Large analog/digital display
    • Built-in timer
    • Locking test leads for safety
    • Battery indicator
    • Weatherproof to IP54
    • Voltage measurement and warning BM11D
    • Large, custom analog/Digital LCD
    • Built-in timer
    • Locking test leads for safety
    • Battery indicator
    • Automatic discharge of capacitance
    • Voltage measurement and warning
    • Tests to 500 GΩ
    • Weather proof to IP54
  
 
  Product Description:  
 

 

 

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The Megger® BM11 series of 5 kV Insulation Testers provides a choice of features to suit all applications and budgets.

The traditional BM11 instrument became the industrystandard 5 kV tester. It is battery-powered, housed in a rugged case and has a large, simple white-on-black scale. The series has been extended with three analog/digital instruments; the BM11D, BM21 and BM25. These instruments show results and test options on a large, clear analog/digital scale for both practicality and precision. A built-in timer makes both spot tests and PI testing easier to carry out.

  
 
  General Information:  
 
  • APPLICATIONS
     The BM11 series is designed for testing the insulation of high voltage electrical equipment and the wide voltage range also allows it to be applied to low voltage equipment.
  • Generators, motors, transformers, cables and switchgear all require effective maintenance and the test techniques on the Megger range give valuable diagnostic information. ‘Spot’ Insulation tests that are the most widely used, check on the general condition of electrical insulation, called up in most standards covering equipment design, testing, installation and maintenance.
  • Insulation suffers from gradual steady decline, as well as occasional sudden damage; the effects of dirt, grease, moisture, vibration and chemical attack can be tracked through the recording of Polarisation Index tests which remove the temperature dependence of raw Insulation Resistance measurements.
  • For finding more localised insulation problems, the BM25 includes both Step Voltage and Dielectric Discharge tests. Step Voltage identifies local weak spots because they respond differently as the electrical stress is increased, while the Dielectric Discharge test can show up a single bad layer in multilayer insulation.
  • The key to Predictive Maintenance is the trending of diagnostic tests and this is facilitated on the BM25 by the ability to use a PC to store results over time for trend analysis.
  
 
  Specifications:  
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Insulation Ranges BM11 BM11D
Test Voltages: 500, 1000, 2500, 5000 V
Insulation Resistance Range: 100 kΩ to 100 GΩ; at all test voltages Digital
10 kΩ - 50 GΩ @ 500 V
10 kΩ - 100 GΩ @ 1000 V
10 kΩ - 250 GΩ @ 2500 V
10 kΩ - 500 GΩ @ 5 kV

analog
100 kΩ to 1 TΩ @ all voltages
Accuracy ±1,5% of arc length ±5% of reading 10 MΩ to 100 GΩ @ 5 kV
Short Circuit Current 1 mA nominal, 2 mA max. 1,8 mA nominal, 2 mA max.
Voltage Range 50 to 1000 V d.c. or a.c. 50 to 1000 V d.c. or a.c.
Accuracy: ±5% ±10 V ±2% ±1 V
General    
Display : Analog Analog / Digital
Operating Temperature : -15 to +55°C
(5 to +131°F)		 -20°C to +50°C
(-4 to 122°F)
Storage Temperature -40 to +65 °C
(-40 to +149°F)		 -25°C to +65°C
(-13 to 149°F)
Temperature Coeffecient: < 0,04% of arc length per °C (0.2%/°F) 0,2% per °C (0.1%/°F) for test currents >100 nA (Applies over range 0 to 30°C) 0,2% per °C for test currents >100 nA (0.1%/°F) 0,1% per °C for test voltage (0.05%/°F)
Humidity Range 90% RH @ 40°C max. (104°F) 90% RH @ 40°C max. (104°F)
Safety Safety IEC348 IEC1010-1 (1995), EN61010 (1995) to installation category III, 300 V, phase to earth, 500 V phase to phase
 
 
  Downloads:  
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  pdf_pic Downloads: General Specifications  
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BM11
Power Supply
 NiCd battery pack of 2 Ah capacity.

Battery life:
typically 8 hrs continuous (varying between 2 h and 20 h depending upon load conditions). Battery charging: built-in-charging unit, operating from 100 V to 250 V a.c. supply, 50 Hz or 60 Hz, charging time: 16 hrs.

Low battery voltage indication:
small oscillations of the pointer occur with an approx. 80% exhausted battery, large pointer oscillations occur when the battery must be recharged.

Dimensions
344 x 245 x 158 mm
(13 1⁄2 x 9 5⁄8 in approx.)

Weight
4,8 kg (10 1⁄2 lb approx.)

BM11D
 Humidity Range:
90% RH at 40°C max. (104°F)

Safety
IEC1010-1 (1995), EN61010 (1995) to installation category III, 300 V, phase to earth, 500 V phase to phase

Power Supply
 Rechargeable sealed lead-acid batteries (12 V, 4 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% d.c. emergency charge socket from 12 V d.c. Comprehensive battery state indicator on display.

Dimensions
344 x 245 x 158 mm
(13 1⁄2 x 9 5⁄8 in approx.)

Weight
5,6 kg (12 1⁄2 lb approx.)
 

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Head office located at: 900 McKay Rd., Pickering, Ontario L1W 3X8 (click for map)
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All descriptions and specifications are subject to change without notice
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