MR8740T_Quick guide_eng_20191016H.pdf - 第15页

9 Operation Precautions CAUTION Failure to observe the following precaution may result in bodily injury . • The instrument weighs about 14 kg (20.8 kg with modules installed in all slots). It should be moved by at least …

Operation Precautions

Follow these precautions to ensure safe operation and to obtain the full benets of the various

functions.

Checks before Use

DANGER

If the connection cords or the instrument is damaged, there is a risk of an electric

shock. Perform the following inspection before using the instrument:

• Check that the insulation of the connection cords are neither ripped nor torn

and that no metal parts are exposed before using the instrument. Using the

instrument under such conditions could result in an electric shock. Replace the

connection cords with those specied by our company.

• Check if there is any damage to the instrument occurred during storage or

shipping and verify that it operates normally before using the instrument. If you

nd any damage, contact your authorized Hioki distributor or reseller.

Installing the instrument and modules

WARNING

Installing the instrument in inappropriate locations could cause a malfunction of

the instrument an accident, or re. Avoid the locations that are:

• Exposed to direct sunlight or high temperatures

• Exposed to corrosive or combustible gases

• Exposed to strong electromagnetic elds or electrostatic charges

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

systems 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

• Unplugging the power cord kills power to the instrument. Be sure to provide

enough unobstructed space to unplug the power cord immediately in an

emergency.

• Use M4 × 8 mm screws to x the rack-mount brackets on the MR8740-50.

Using a screw longer than 8 mm can cause damage to the inside of the instrument

or an electric shock.

Operation Precautions

CAUTION

Failure to observe the following precaution may result in bodily injury.

• The instrument weighs about 14 kg (20.8 kg with modules installed in all slots). It

should be moved by at least two people.

• The instrument is heavy. When transporting it, follow your company’s workplace safety

standards to assure safety (for example, by wearing non-slip gloves and protective

footwear).

• Do not place the instrument on an unstable table.

• Do not place the instrument on an inclined

surface.

• Do not stack the multiple instruments.

• Vents must not be blocked.

• To prevent overheating, be sure to leave 5 cm

(2 inches) around the instrument.

• The instrument should be operated only with the

bottom side downwards.

5 cm or wider

Operation Precautions

Handling the instrument and modules

DANGER

• Do not use the modules or the cables to measure circuits that exceed those

ratings or specications. Damage to the instrument or overheating can cause

bodily injury.

• The maximum input voltage and maximum rated voltage to earth of the modules

and connection cords are shown in the following table. To avoid an electric

shock and damage to the instrument, ensure that input voltage never exceeds

these limits. The lower maximum input voltage of the module or connection

cord must be used. Measuring a voltage exceeding this value can cause

damage to the instrument, resulting in bodily injury. The same applies to the

maximum rated voltage to earth using an input attenuator for the measurement.

Ensure that the connection does not allow the input voltage to exceed the

maximum rated voltage to earth.

Refer to “5.2 Specications of the Options” (p. 101).

Rating of input modules

Modules Maximum input voltage

Maximum rated voltage to

earth

Model 8966 Analog Unit 400 V DC 300 V AC/DC (CAT II)

Model 8967 Temp Unit – 300 V AC/DC (CAT II)

Model 8968 High Resolution Unit 400 V DC 300 V AC/DC (CAT II)

Model U8969 Strain Unit – 30 V rms / 60 V DC

Model 8970 Freq Unit 400 V DC 300 V AC/DC (CAT II)

Model 8971 Current Unit – Non-isolated

Model 8972 DC/RMS Unit 400 V DC 300 V AC/DC (CAT II)

Model 8973 Logic Unit – Non-isolated

Model U8974 High Voltage Unit

1000 V DC

700 V AC

1000 V AC/DC (CAT III)

600 V AC/DC (CAT IV)

Model U8975 4ch Analog Unit 200 V DC 300 V AC/DC (CAT II)

Model U8977 3CH Current Unit – Non-isolated

Model U8978 4CH Analog Unit

40 V DC (Direct input)

400 V DC (with Model 9665

10:1 Probe used)

30 V AC, 60 V DC

(Direct input)

300 V AC/DC (CAT II)

(with Model 9665 10:1

Probe used)

Model U8979 Charge Unit 40 V DC

30 V AC

60 V DC

Model

MR8990

Digital Voltmeter Unit 500 V DC 300 V AC/DC (CAT II)

Model U8991 Digital Voltmeter Unit 100 V DC 100 V AC/DC

ModulesModel MR8740T

High

Low

Maximum input voltage

Maximum rated voltage

to earth