User Manual

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Notes on Use
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DANGE
R
The external I/O terminal and the unit have a common GND.
The maximum rated voltage to earth rating applies also if an input
attenuator or similar is used. Ensure that voltage does not exceed these
ratings.
When measuring power line voltages with the 8936 or 8938, always
connect the probe to the secondary side of the circuit breaker.
Connection to the primary side involves the risk of electric shock and
damage to the units.
Before using the instrument, make sure that the insulation on the
connection cords is undamaged and that no bare conductors are
improperly exposed. Using the instrument under such conditions could
result in electrocution. Replace the connection cords specified by Hioki.
■Logic Probe Connection
The logic input and 8826 Unit share a common ground. Therefore, if powe
r
is supplied to the measurement object of the logic probe and to the 8826
from different sources, an electric shock or damage to the equipment may
result. Even if power is supplied from the same system, if the wiring is such
that a potential difference is present between the grounds, current will flow
through the logic probe so that the measurement object and 8826 could be
damaged. We therefore recommend the following connection method to
avoid this kind of result. Refer to Section 2.5 for details.
(1) Before connecting the logic probe to the measurement object, be sure
that power is supplied from the same outlet box to the measuremen
t
object and the 8826 using the supplied grounded 2-wire power cord.
(2) Before connecting the logic probe to the measurement object, connec
t
the ground of the measurement object to the 8826 ground terminal. Also
in this case, power should be supplied from the same source. Refer to
Section 2.2 for grounding terminal details.