MR8740、MR8741_user_manual_eng_20191016H.pdf - 第19页

Safety Information 7 To ensure safe operatio n of measurin g instruments, IEC 61010 establishe s safety standards for vario us electrical environments, categorized as CAT II to CAT IV, called measurement categories. CAT …

Safety Information

Mouse Operations

Click: Press and quickly release the left button of the mouse.

Right-click: Press and quickly release the right button of the mouse.

Double-click: Quickly click the left button of the mouse twice.

Drag: Move the mouse while holding down the left button of the

mouse, and then release the button at the desired position.

Activate: Click on a screen to activate that screen.

Accuracy

We define measurement tolerances in terms of f.s. (full scale) values, with the following meanings:

f.s. (maximum display value or scale length)

The maximum displayable value or scale length. In this instrument, the maxi-

mum displayable value is the range (V/div) times the number of divisions (20) on

the vertical axis.

Example: For the 1 V/div range, f.s. = 20 V

rdg. (reading value, displayed value, or indicated value)

The value currently being measured and indicated on the measuring instrument.

Safety Information

To ensure safe operation of measuring instruments, IEC 61010 establishes

safety standards for various electrical environments, categorized as CAT II to

CAT IV, called measurement categories.

CAT II When directly measuring the electrical outlet receptacles of the primary

electrical circuits in equipment connected to an AC electrical outlet by a

power cord (portable tools, household appliances, etc.)

CAT III When measuring the primary electrical circuits of heavy equipment

(fixed installations) connected directly to the distribution panel, and feed-

ers from the distribution panel to outlets

CAT IV When measuring the circuit from the service drop to the service

entrance, and to the power meter and primary overcurrent protection

device (distribution panel)

Measurement categories

• Using a measuring instrument in an environment designated with a higher-

numbered category than that for which the instrument is rated could result in

severe accidents, and must be carefully avoided.

• Using a measuring instrument that has no category rating in an environment

designated with the CAT II to CAT IV category could result in severe accidents,

and must be carefully avoided.

The applicable measurement category is determined by the module being used.

Refer to "17.6 Specifications of Modules" (p.352).

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