Hioki ST5520, Instruction Manual, Page: 64 / 201

56
Checking Faulty Contact and Contact Status (Contact check function)
5.1
Checking Faulty Contact and Contact Status
(Contact check function)
The faulty contact of the equipment to be measured and probes and the broken wires
of the measurement cables are detected.
The measurement terminals on the rear panel of the instrument are used for contact
check. The contact check function monitors the contacts from the start to the end of
measurement in every sampling and can detect faulty contacts and broken wires of
the probes not only before and after tests but also during the tests. If faulty contacts
are detected, a contact error (ContLo M
Ω
, ContHi M
Ω
, or ContHL M
Ω
) is displayed
in the measured value display section, and the test stops. (The ERR signal is output
from EXT.I/O.) When this error is displayed, check the probe contact and for any
broken wires of the measurement cables. (The instrument needs to be repaired if the
error does not disappear even when the measurement cables that are not broken are
short circuited.)
IMPORTANT
•
Even if the measurement speed is set to [FAST] , the sampling time takes 100
ms when the contact check function is ON. (The sampling time is 500 ms if the
measurement speed is set to
[SLOW] regardless of the function check setting.)
•
When the contact check function is set to OFF, a measured value is displayed
even if the probe is not in contact with the equipment to be measured.
•
If the set test duration is shorter than the sampling time, a proper measurement
cannot be performed. (The measured value may not be displayed.) Set a test
duration that is longer than the sampling time.