Avoiding Problems
4-10 72A-1230 Rev. F
July 22, 2005
Safety Board
04D-0544
The Safety Board latches off the Amplifier
Assembly and opens the safety relays when
a potential operator safety hazard or
hardware overload is detected. It also
reports safety status and receives safety
commands from the DSP/CPU Board.
Main Reference Assembly
04D-0583
The Main Reference Assembly stores
calibration standard values used in
comparing the measured specimen power
factor and capacitance values.
Guard Board
04D-0527
The Guard Board provides signal
conditioning of the specimen and reference
currents for A/D conversion. Its functions
include shunt selection, signal scaling,
anti-alias filtering and A/D conversion. The
optimum current range is selected
automatically unless the operator manually
specifies a range.
Low Voltage Power Supply
Board
384-0138
The Low Voltage Power Supply Board
supplies +5 VDC, –5 VDC, +15 VDC and
–15 VDC for internal use throughout the
M4100 Instrument.
Heater/Temperature
Controller Board
04D-0547
The Heater/Temperature Controller Board
senses the internal temperature and controls
the fan.
Field Calibration Reference
(Optional)
04D-0524
The Field Calibration Reference provides a
means for checking calibration of the
M4100 in the field using pre-calibrated,
precision resistors. It can also be used as an
external reference for other types of
measurements, such as transformer
short-circuit impedance tests and turns-ratio
tests.
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