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.
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 units with a variable
test voltage in 25 V steps. These top of the range units also
allow measurement of resistance to 5 T½, 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 Polarisation Index, Step Voltage and Dielectric
Discharge tests as well as providing an optically isolated RS232
port for downloading results during a test.
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