MR8740T_Quick guide_eng_20191016H.pdf - 第16页

10 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…

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

Operation Precautions

Rating of generator modules

You can mixedly install generator modules and measurement modules in the instrument.

Intended use Model name Number of

channels

Maximum output

frequency

Output voltage

For generating sine

wave and DC

Model MR8790

Waveform Generator

Unit

4 20 kHz −10 V to 10 V

For generating pulse

Model MR8791

Pulse Generator Unit

8 20 kHz

TTL level

(amplitude: 0 to 5 V)

Open-collector output

For generating DC

voltage, DC current,

and resistance

generation

Model U8794

VIR Generator Unit

Voltage: −0.1 V to 5.3 V

Current: −5 mA to 5 mA

Resistance: 10

to 1 M

Ratings of connection cords

Connection Cord Maximum input voltage Maximum rated voltage to earth

Model L9197 Connection Cord 600 V AC/DC

600 V AC/DC (CAT III)

300 V AC/DC (CAT IV)

Model L9198 Connection Cord

(for measuring low-voltage)

300 V AC/DC

600 V AC/DC (CAT II)

300 V AC/DC (CAT III)

Model L9217 Connection Cord

Model L9790 Connection Cord 600 V AC/DC

• With Model L9790-01 Alligator Clip or

Model 9790-03 Contact Pin attached

600 V AC/DC (CAT II)

300 V AC/DC (CAT III)

• With Model 9790-02 Grabber Clip

attached

300 V AC/DC (CAT II)

150 V AC/DC (CAT III)

Model 9322 Differential Probe

2000 V DC

1000 V AC

• With grabber clips attached

1500 V AC/DC (CAT II)

600 V AC/DC (CAT III)

• With alligator clips attached

1000 V AC/DC (CAT II)

600 V AC/DC (CAT III)

Model L4940 Connection Cord 1000 V DC*

• With Model L4935 Alligator Clip Set or

Model L4932 Test Pin Set attached

600 V AC/DC (CAT IV)

1000 V AC/DC (CAT III)

• With Model 9243 Grabber Clip or

Model L4936 Bus Bar Clip Set attached

600 V AC/DC (CAT III)

• With Model L4937 Magnetic Adapter

Set attached

1000 V AC/DC (CAT III)

• With Model L4934 Small Alligator Clip

Set attached

300 V AC/DC (CAT III)

600 V AC/DC (CAT II)

Model P9000-01 Differential Probe

1000 V AC/DC 1000 V AC/DC (CAT III)

Model P9000-02 Differential Probe

Model 9166 Connection Cord

30 V AC

60 V DC

For inputting voltage into Model U8979

*: When Model U8974 High Voltage Unit is used