MR8740T_Quick guide_eng_20191016H.pdf - 第149页
143 6 Maintenance and Service W ARNING T ouching any of the high-voltage points inside the instrument is very dangerous. Do not attempt to modify , disassemble, or repair the instrument. Doing so may cause a re, electri…
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Specications of the Options
Specications of output connector
Connector used: 25 pins, female, locking-block screws #4-40
Connector pin-out
Pin Signal name Pin Signal name
1 NC 14 CH8_GND
2 CH8_RESERVE 15 CH8_OUTPUT
3 CH7_GND 16 CH7_RESERVE
4 CH7_OUTPUT 17 CH6_GND
5 CH6_RESERVE 18 CH6_OUTPUT
6 CH5_GND 19 CH5_RESERVE
7 CH5_OUTPUT 20 CH4_GND
8 CH4_RESERVE 21 CH4_OUTPUT
9 CH3_GND 22 CH3_RESERVE
10 CH3_OUTPUT 23 CH2_GND
11 CH2_RESERVE 24 CH2_OUTPUT
12 CH1_GND 25 CH1_RESERVE
13 CH1_OUTPUT
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6
Maintenance and Service
WARNING
Touching any of the high-voltage points inside the instrument is very dangerous.
Do not attempt to modify, disassemble, or repair the instrument. Doing so may
cause a re, electric shock, or injury.
Calibration
The calibration period varies depending on the state of the instrument and installation environment.
We recommend that the calibration period be determined in accordance with the state of the
instrument and installation environment. Please contact your authorized Hioki distributor or reseller
to have your instrument periodically calibrated.
Backing up the data
The instrument may be initialized (returned to the factory default settings) when it is repaired or
calibrated.
Before you ask for repair or calibration, it is recommended to back up (save or record) the
measurement conditions and measured data.
Precautions during shipment
Be sure to observe the following precautions:
• To avoid damage to the instrument, remove any accessories and optional equipment from the
instrument. Use the original packing materials the instrument was shipped in. Damage that
occurs during transportation is not covered by the warranty.
• When sending the instrument for repair, be sure to include a memo that describes the problem in
detail.
6 Maintenance and Service
6
Maintenance and Service
144
Replaceable parts and operating lifetimes
The characteristics of some of the parts used in the instrument may deteriorate with extended use.
To ensure the instrument can be used over the long term, it is recommended to replace these parts
on a periodic basis. When replacing batteries, please contact your authorized Hioki distributor or
reseller.
The service life of parts varies with the operating environment and frequency of use. Parts are not
guaranteed to operate throughout the recommended replacement cycle.
Part name
Recommended
replacement cycle
Remarks/conditions
Fan motor About 5 years –
SSD About 1,400 hours
(When the instrument
writes data
continuously)
At an ambient temperature of 25°C
Total bytes written (TBW): About 300 TB
Data retention period: About 1 year (When the instrument is
turned off)
Data backup at regular intervals is recommended.
Electrolytic
capacitors
About 10 years Deteriorates in about 10 years when the instrument is used
in a severe environment (at an ambient temperature of
40°C).
Lithium battery About 10 years The instrument contains built-in backup lithium batteries,
which offer a service life of about 10 years.
If the date and time deviate substantially at power-on, it is
the time to replace that battery. Contact your authorized
Hioki distributor or reseller.
Built-in battery About 2 years The instrument contains a built-in battery. Regularly
replacing the batteries is required because a powerless
battery can prevent Windows
®
from shutting down and thus
correctly restarting. When recommended replacing period
has passed, contact your authorized Hioki distributor or
reseller.
The fuse is housed in the power unit of the instrument. If the instrument is not powered on, the fuse
may be blown. Customers cannot replace the fuse or repair the instrument. Please contact your
authorized Hioki distributor or reseller.