Fluke Biomedical 190M - Manual (Page 17)

If Safety Features are Impaired
7
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Warning
• Do not operate the test tool with covers
removed or the case open. Hazardous voltage
exposure is possible.
• Remove the input signals before you clean
the test tool.
• Use only specified replacement parts.
Voltage ratings that are mentioned in the warnings are
given as limits for “working voltage.” They represent V AC
RMS (50 or 60 Hz) for ac sinewave applications and V DC
for DC applications.
Measurement Category IV refers to the overhead or
underground utility service of an installation.
Measurement Category III refers to distribution level and
fixed installation circuits inside a building.
Measurement Category II refers to local level, which is
applicable for appliances and portable equipment.
The terms “Isolated” or “Electrically floating” are used in
this manual to indicate a measurement in which the test
tool input BNC is connected to a voltage different from
earth ground.
The isolated input connectors have no exposed metal and
are fully insulated to protect against electrical shock.
The BNC jacks can independently be connected to a
voltage above earth ground for isolated (electrically
floating) measurements and are rated up to 1000 V RMS
CAT III and 600 V RMS CAT IV with respect to earth
ground.
If Safety Features are Impaired
Use of the test tool in a manner not specified may
impair the protection provided by the equipment.
Do not use test leads if they are damaged. Examine the
test leads for damaged insulation, exposed metal, or if the
wear indicator shows.
Whenever it is likely that safety has been impaired, turn off
the test tool and disconnect it from any external signal
sources and line power. Refer to qualified personnel.
Safety is likely to be impaired if, for example, the test tool
fails to perform the intended measurements or shows
visible damage.