M4100 Instrument
1-2 72A-1230 Rev. F
July 22, 2005
Both an operator and safety supervisor must be present when specimens are
tested. Each person holds a safety switch that directly controls the output of
the power amplifier through redundant electromechanical relays. In addition,
the control processor can vote to disable the dc supply to the safety relay coils,
thereby disabling the amplifier output if certain conditions are not met.
NOTE For greater safety details, see ”Safety Practices – General Rules”
on page 1-20.
M4000 Components
The M4000 Insulation Analyzer consists of the following components:
• M4100 Instrument
• M4200c Controller or Third-Party Controller
• M4000 Software
The following auxiliary components are optional:
• M4150 or M4151 Field Calibration Reference
• M4300 Transport
• Leakage Reactance Test Software
• External Reference Test Software
•DTA Software
• M4110 Leakage Reactance Interface
• M4120 External Reference Module
• Doble Standard Turns Ratio Capacitor
• Safety Strobe
• Temperature and Humidity Probe
M4100 Instrument
The M4100 instrument supplies test voltage and test current to insulation
specimens. The M4100 instrument also contains measuring circuits to
determine the condition of the insulation under test, as well as direct control
safety circuits to ensure electrical safety of personnel and test apparatus.
The M4100 instrument has a time base generator that may be synchronized
either with the power system supplying power to the test instrument, or with
an internal crystal oscillator. This choice allows the test operator to select one
of two modes of test operation, Line Sync Reversal or Line Frequency
Modulation. When Line Sync Reversal Mode is selected, the time base is
synchronized to the power source and the test will use the standard Doble
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