MR8740、MR8741_user_manual_eng_20191016H.pdf - 第21页

Operating Precautions 9 Handling the Inst rument and Modules • Do not exceed the range of the specifications and the rated value of the cable or the module. Otherwise, the instru ment may b e damaged or may prod uce heat…

Operating Precautions

Follow these precautions to ensure safe operation and to obtain the full benefits of the various functions.

Installing To prevent overheating, be sure to leave the specified clearances around the unit.

• The instrument should be operated only with the bottom side downwards.

• Vents must not be obstructed.

• Do not install the instrument at a slanted angle.

When mounting the instrument in a system rack, make sure the operating tem-

perature range of the instrument will not be exceeded.

Operating Precautions

Before Use

If connection cables or instrument are damaged, there is a risk of electric shock.

Before using the instrument, perform the following inspection.

• Before using the instrument, check that the insulation of the connection cables

is not damaged and that no metal parts are exposed. Using the instrument

under such conditions could result in electric shock. Replace the connection

cable with those specified by our company.

• Verify that it operates normally to ensure that no damage occurred during stor-

age or shipping. If you find any damage, contact your authorized Hioki distribu-

tor or reseller.

Installing the instrument and modules

Installing the instrument and modules in inappropriate locations may cause a

malfunction of instrument or may give rise to an accident. Avoid the following

locations:

• Exposed to direct sunlight or high temperatures

• Exposed to corrosive or combustible gases

• Exposed to a strong electromagnetic field or electrostatic charge

• Near induction heating systems (such as high-frequency induction heating sys-

tems and IH cooking equipment)

• Susceptible to vibration

• Exposed to water, oil, chemicals, or solvents

• Exposed to high humidity or condensation

• Exposed to high quantities of dust particles

Do not place the instrument on an unstable table or an inclined place. Knockin-

gover or dropping the instrument can damage the instrument.

Rear

At least 5 cm

At least 5 cm on the left and right sides

Operating Precautions

Handling the Instrument and Modules

• Do not exceed the range of the specifications and the rated value of the cable

or the module. Otherwise, the instrument may be damaged or may produce

heat, resulting in personal injury.

The maximum rated voltage to earth does not change when an attenuator or

similar is used at the input. Take the connection method into consideration and

make sure that the rating is not exceeded.

• To avoid electric shock, do not remove the instrument’s cover and the module

case.

The internal components of the instrument carry high voltages and may

become very hot during operation.

• It is recommended to measure the secondary side of a distribution panel with

the U8974 High Voltage Unit. Do not connect the connection cords on the pri-

mary side of the distribution panel because an unrestricted current flow can

damage the connection cords and facilities if a short-circuit occurs.

• Each channel of Model U8979 Charge Unit has the BNC terminal and minia-

ture connector terminal with the common ground. Do not connect cords with

each of the terminals simultaneously to avoid a short-circuit.

• Setting the measurement mode to [PreAmp] allows Model U8979 Charge Unit

to constantly provide power (3.5 mA, 22 V) to sensors. Set any measurement

mode other than [PreAmp] or tum off the instrument before connecting a sen-

sor or probe with a BNC terminal to avoid an electric shock or damage to the

measurement target.

• To avoid electric shocks, confirm that the instrument is turned off and the con-

nection cables are disconnected before removing or replacing a module.

• To avoid electric shocks, do not operate the instrument with a module

removed.

To use the instrument after removing a module, install a blank panel over the

opening of the removed module.

• To prevent instrument damage or electric shocks, use only the screws for

securing the module in place that shipped with the instrument.

If you lose any screw or find that any screws are damaged, please contact

your Hioki distributor for a replacement.

• Model U8979 Charge Unit has miniature connectors with the maximum input

charge of ±500 pC (for six higher-sensitivity range) or ±50,000 pC (for six

lower-sensitivity range). Inputting a charge that exceeds these value causes

damage to the instrument.

• Use an acceleration sensor with a built-in pre-amplifier that conforms to the

specification of Model U8979 (3.5 mA, 22 V). Using a inapplicable sensor may

cause damaging itself.

• To avoid damage to the instrument, protect it from physical shock when trans-

porting and handling. Be especially careful to avoid physical shock from drop-

ping.

• The mounting screws must be firmly tightened or the module may not perform

as specified or may fail.

• To avoid damaging modules, do not touch the module connectors on this

instrument.

Operating Precautions

• Before transporting the instrument, disconnect all cables and USB memory

sticks.

• When there is no input, the waveform might be unstable due to the induced

voltage, but this is not an error.

• This instrument may cause interference if used in residential areas. Such use

must be avoided unless the user takes special measures to reduce electro-

magnetic emissions to prevent interference to the reception of radio and televi-

sion broadcasts.

Handling Media

• Do not remove the media while it is being accessed by the instrument. Data on

the media could be lost.

• Do not turn off the power to the instrument while the media is being accessed

by the instrument. Data on the media could be lost.

• Do not transport the instrument while a USB flash drive is connected. Damage

could result.

• If damage occurs to the data on the media, we cannot restore or analyze the lost

data. No compensation will be provided, regardless of the type or cause of the

problem or damage.We therefore recommend maintaining a backup of any

important data.

• Be careful to avoid inserting a media backwards or upside-down. The media or

the instrument could be damaged.

• Never insert or eject a media while it is being accessed by the instrument. Data

on the media could be lost.

• Do not operate the instrument at a slanted angle. It may not work properly.

• Do not transport the instrument while a USB memory stick is connected. Dam-

age could result.

• Some USB memory sticks are susceptible to static electricity. Exercise care

when using such products because static electricity could damage the USB

memory stick or cause malfunction of the instrument.

• With some USB devices, the instrument may not start up if power is turned on

while the device is inserted to the USB port. In such a case, turn power on first,

and then insert the USB device. It is recommended to try out operation with a

USB memory stick before starting to use it for actual measurements.

• Peculiar USB memory requiring fingerprint authentication or password cannot be

used.

• When saving or loading data, insert the storage media before selecting it. If the

media is not inserted, the file list display will not appear.

• All media (USB memory) have a limited service life. After extensive use over a

long period, data retention and readout may become stop working. In that

case, replace the card with a new one.

• Automatic saving of data is possible only on USB memory stick media.

• The data can be automatically stored in the USB flash memory; however, it is

not guaranteed to work.