Biddle BM25

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 industry-standard 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. They are powered by a built-in rechargeable lead-acid battery which can be charged directly from any supply from 95 V to 265 V. All testers incorporate a guard terminal to allow surface leakage to be removed. Pre-set standard test voltages at 500 V, 1000 V, 2500 V and 5000 V are supplemented on the BM21 and BM25 unit switch a variable test voltage in 25 V steps. These top of the range units also allow measurement of resistance to 5 TΩ,leakage current to 0,01 nA and can display capacitance at the end of a test to 10 µF.  The BM25 extends the diagnostic testing capability of the range by performing automatic Polarization Index, Step-Voltage and Dielectric Discharge tests as well as providing an optically isolated RS232 port for downloading results during a test.

Features

• Spot Tests and Diagnostic insulation tests
• Simplicity and Ease of Use
• User safety features
• Unique rugged casing
• Analog and Analog/Digital Displays
• Wide range of test voltages
• Automated Testing (BM25 Only)

■ Choice of test voltages
■ Direct reading display
■ Unique rugged case
■ Guard terminal
■ Designed for user safety ■Large, custom Analogue/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

■ Variable test voltage in 25 V steps
■ Breakdown or ‘Burn’ modes allow choice of diagnostic approach
■ Shows capacitance at end of test
■ Timer sets test duration for easier test control
■ Tests to 5,000 GΩ
■ Leakage current mode

■ Automated testing for increased productivity
■ Polarisation Index and Step Voltage tests
■ Dielectric Discharge test for multilayer insulation
■ Optically isolated RS232 port for real-time download

■ Variable test duration controlled by timer

■ Variable test voltage in 25 V steps to 5000 V

■ Leakage current and capacitance measurement

■ Breakdown or Burn modes

■ Tests to 5,000 GΩ