Hioki MR8740, Instruction Manual

Page: 23 / 424

Operating Precautions
11
Before Connecting a Logic Probe to the Measurement Object
To avoid electric shock and short circuit accidents or damage to the instru-
ment, pay attention to the following:
• The ground pin in the LOGIC connector (plug) of the Model 9320-01 and
9327 Logic Probes (and legacy Models 9306 and 9320) is not isolated
from this instrument’s ground (common ground).
Use grounding-type polarized power cords for the measurement object
and this instrument, and obtain power from the same mains circuit.
Connecting to different mains circuits or using a non-grounding power
cord may cause damage to the measurement object or this instrument
because of current flow through the logic probes resulting from potential
difference between the grounds of the different wiring systems.
To avoid these problems, we recommend the following connection pro-
cedure:
Measurement
Object
Memory
HiCorder
Logic probe
Connect this instrument to the same
outlet as the measurement object us-
ing the (supplied) grounding polar-
ized power cord.
ground to the GND terminal
(functional earth terminal) of this
instrument.
(Always obtain power from the
same mains circuit.)
Measurement
Object
Logic probe
Functional
Earth Termi-
nals
GND
Memory
HiCorder
Before Turning the Power Supply On
• To avoid electrical accidents and to maintain the safety specifications of this
instrument, connect the power cord provided only to an outlet.ïï
• Before turning the instrument on, make sure the supply voltage matches that
indicated on its power connector. Connection to an improper supply voltage
may damage the instrument and present an electrical hazard.
Avoid using an uninterruptible power supply (UPS), DC/AC inverter with rectan-
gular wave or pseudo-sine-wave output to power the instrument. Doing so may
damage the instrument.
Turn off the power before disconnecting the power cord.