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SAFETY PRECAUTIONS
The following
safety precautions should be observed before operating the Model 485.
This instrument is intended for use by qualified personnel who recognize shock hazards and are familiar
with the safety precautions
required to avoid possible injury. Read over the manual carefully before
operating this instrument.
Exercise extreme caution when a shock hazard is present at the instrument's
input. The American
National Standards Institute (ANSI) states that a shock hazard exists when voltage levels greater than
30V rms or 42.4V peak are present. A good safety practice is to expect that a hazardous voltage
is present in any unknown
circuit before measuring.
Do not exceed 30V rms between the input connector shell and earth ground.
Inspect the test leads for possible weer, cracks or breaks before each use. If any defects are found,
replace with test leads that have the same measure of safety as those supplied with the instrument.
For optimum safety do not touch the test leads or the instrument while power is applied to the circuit
under test. Turn the power off and discharge all capacitors, before connecting or disconnecting
the in-
strument.
Do not touch any object which could provide a current path to the common side of the circuit under
test or power line (earth) ground. Always make measurements with dry hands while standing on a dry,
insulated surface, capable of withstanding
the voltage being measured.
Do not exceed the instrument's maximum allowable input as defined in the specifications and operation
section.
Safe operation and good measurement practice dictates use of an external resistor when necessary to
limit input currents to less than 3mA.
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