MR8740T_Quick guide_eng_20191016H.pdf - 第21页
15 Operation Precautions Built-in battery The instrument contains a battery (sealed lead acid battery) to shut down Windows ® in case power is cut (power outrage or turning off a breaker). Since the battery has a limited…
14
Operation Precautions
Handling storage devices
CAUTION
• Do not carry the instrument with a USB ash drive inserted. Damage could result.
•
Do not subject the instrument to extreme shock or vibration. Shock can cause damage to
the built-in SSD unit.
• Do not insert a storage device upside down, backward, or in the wrong direction.
Doing so may damage the storage device or instrument.
Exercise care when using such products because static electricity could damage the
external storage device or cause a malfunction of the instrument.
IMPORTANT
• Do not extract any external storage device or turn off the instrument while the instrument is
accessing the storage device (while the green DIAG LED is lighting up). Data stored in the
device could be lost.
• No compensation is available for loss of data stored on the external storage device (USB ash
drive) or the built-in SSD unit of the instrument, regardless of the content or cause of damage
or loss. Be sure to back up any important data stored on the device (USB ash drive) and the
built-in SSD unit of the instrument.
• When the instrument is left powered off for a long period of time (about 1 year or more), the
data saved to the built-in SSD may be lost. Be sure to back up the data if the instrument is to
be left powered off for a long time.
• With some external storage device, the instrument may not start up if power is turned on while
the device is inserted. In such a case, turn off and cycle the instrument.
• The instrument supports not all commercially available USB ash drives.
• The number of times data can be written on external storage devices (USB ash drive) and the
built-in SSD unit of the instrument is limited by their ash memory. If data has been rewritten
many times, data reading and writing capabilities will be degraded. In that case, replace the
device.
• Model Z4006 USB Drive can be used to save data. Use the product available as Hioki’s option
only. (p. 5)
15
Operation Precautions
Built-in battery
The instrument contains a battery (sealed lead acid battery) to shut down Windows
®
in case power
is cut (power outrage or turning off a breaker). Since the battery has a limited life expectancy,
it must regularly be replaced. When replacing batteries, please contact your authorized Hioki
distributor or reseller.
Expected lifetime: About 2 years (Operated at an ambient temperature of
25°, when the instrument is turned off once a day)
About 4 years (Operated at an ambient temperature of
25°, when the instrument is turned off ve times a year)
CAUTION
• You have to charge the battery periodically even if you do not use the instrument.
Periodically charge the battery every three months at a storage temperature of 35°C;
every six months at a storage temperature of 25°C. Failure to do so may reduce the
battery life expectancy.
• Do not install the instrument in a sealed space or near a re. Doing so may cause an
explosion or re.
• Do not use the instrument at high ambient temperature. Do not use the instrument
with the end-of-life battery. Doing so may cause electrolyte leakage, resulting in a bad
inuence that includes a re at a worst. Make sure that you use the instrument within
the operating temperature range and inspect and replace the battery periodically.
16
Operation Precautions
Before connecting cords
For detailed precautions and instructions on connections, refer to the instruction manuals of your
connection cords.
DANGER
• If the insulation on a connecting cable melts, the metal conductor may be
exposed. Do not use any cable whose metal conductor is exposed. Doing so
could result in an electric shock, burn, or other hazards.
When measuring power line voltage
• Only connect connection cords on the secondary side of a distribution panel. If
a short-circuit occurs on the secondary side of the distribution panel, the panel
will interrupt the short-circuit current. Do not connect the connection cords on
the primary side of the distribution panel because an unrestricted current ow
can damage the connection cords and facilities if a short-circuit occurs.
• To prevent an electrical shock and bodily injury, do not touch any input
terminals on the VT (PT), CT or the instrument when they are in operation.
• Do not leave the measurement cables connected to the instrument in an
environment where voltage may surge beyond the maximum input voltage.
Applying voltage may result in damage to the instrument, or serious accidents.
• Do not cause a short-circuit between another wire and the wire to be measured
with the metal tip of the connection cord. Arcs or such grave accidents are
likely to occur.
• To avoid a short-circuit or electric shock, do not touch the metal tip of the
connection cord.
WARNING
• To prevent an electric shock, conrm that the white or red portion (insulation
layer) inside the cable is not exposed. If a color inside the cable is exposed, do
not use the cable.
• Do not place a cable in contact with the lines to be measured. Any contact
can cause the instrument to malfunction and lead to a short-circuit or electric
shock, resulting in bodily injury.
• Be sure to connect the voltage input and current input terminals correctly. An
incorrect connection could damage or a short-circuit.
• Use only the specied connection cords. Using a non-specied cable may
result in unsafe measurements. Using a non-specied cable may also result in
incorrect measurements due to poor connection or other reasons.
• To avoid electric shock, do not exceed the lower of the ratings shown on the
modules and connection cords.