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Caution Statements
The following equipment cautions appear in the text whenever the
equipment is in danger of damage, and are repeated here for emphasis.
CAUTION
Long-term storage of this instrument can affect battery performance and
reduce battery life. Do not store the instrument for long periods of time
without recharging the batteries (refer to page 19). Failure to comply may
result in reduced battery charge and shortened battery life.
CAUTION
If the element cannot be fully inserted into the socket, do not force
it. You might damage the element.
CAUTION
Internal batteries are connected. Remove one of the battery tubes before
unsoldering wires connected to the Main PCB. Failure to comply may result
in permanent equipment damage and severe shock to individuals.
CAUTION
Never apply RF power to the Model 4391A Wattmeter unless both line
section sockets are filled with either an element or a dust plug. If an
element is used it is advisable to place the element with the arrow at a 90°
angle to the coaxial line.
CAUTION
Always be certain the 115/230 voltage selector is set to the proper voltage
before ac power is applied.
CAUTION
Always disconnect AC power before opening the Model 4391 enclosure.
Removal of at least one battery cell is also recommended when servicing the
instrument.
CAUTION
This instrument contains static sensitive electronic components. Before
opening or servicing the unit, make sure that you understand and practice
electrostatic discharge component handling. Failure to comply may result
in permanent damage to sensitive components.