M4000 Insulation Analyzer User Guide
72A-1230 Rev. F 3-25
July 22, 2005
Using A Resonator
Figure 3.16 The Doble Resonator
The Doble Type C Resonating Inductor is an iron-core reactor with an
adjustable air gap, capable of resonating capacitances within a range of 0.05 to
1.0 microfarads at 60 Hz, and a range of 0.07-1.4 at 50 Hz. It is designed to
extend the current range of Doble 10 kV Power-Factor Test Sets up to four
Amps, assuming a lossless specimen, at voltages up to 10 kV. It extends the
use of the set for testing relatively long cable lengths, large rotating machines,
and other high-capacitance specimens. The ultimate range of the resonator
depends not only on the capacitance of the specimen but also the total losses of
the specimen under test.
Figure 3.17 Power-Factor Test Set and Type C Resonating Inductor
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