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92B/96B/99B/105B
Users Manual
If Safety-Protection is Impaired
Use of equipment in a manner not specified may
impair the protection provided by the equipment.
Before use, inspect probes for mechanical damage
and replace damaged probes!
Whenever it is likely that safety has been impaired, the
instrument must be turned off and disconnected from line
power. The matter should then be referred to qualified
personnel. Safety is likely to be impaired if, for example,
the instrument fails to perform the intended measurements
or shows visible damage.
MAKING ISOLATED MEASUREMENTS
Isolating from Earth Ground
The ScopeMeter test tool uses a three-lead connection
system for dual input, isolated (electrically floating)
measurements. Use a test lead connected to the black 4-mm
banana jack as common ground.
There are only three wires to connect for dual input isolated
ground operation, useful for three-phase industrial voltage
measurements. You can connect the three leads on the
test tool (INPUT A, INPUT B, and common) to a three-
phase electrical power line in any order. Use the A-B mode
(see Chapter 5) to display all three phases of electrical
power at the same time.
For three-phase electrical or other isolated ground
industrial measurements, we strongly recommend that you
use the black Industrial Alligator Clip and the red and grey
Industrial Probe Alligator Clips (see Figure 4). These parts
are included with original purchase ScopeMeter test tools
and are also available as accessories from your FLUKE
representative.
Isolating from Input to Input
The ScopeMeter test tool is not isolated between inputs but
uses the black 4-mm banana jack for measurements
isolated from earth ground.
Complete isolation between INPUT A and INPUT B is
useful for some floating measurement applications, such
as measuring different isolated transformer windings at the
same time.
For those applications requiring true
isolated grounds
(commons) between inputs, we recommend that you make
two separate measurements or use two ScopeMeter test
tools.