MR8740、MR8741_user_manual_eng_20191016H.pdf - 第18页
Safety Information 6 Mouse Operations Click: Press and quickly release the left button of the mouse. Right-click: Press and quickly re leas e the right button of the mouse . Double-click: Quickly click the left button of…
Safety Information
5
Symbols in This Manual
Symbols Affixed to the Instrument
Indicates cautions and hazards. When this symbol is printed on the
instrument, refer to the corresponding topic in this Instruction Manual.
Indicates the ON side of the power switch.
Indicates the OFF side of the power switch.
Indicates DC (Direct Current).
Indicates AC (Alternating Current).
Indicates a grounding terminal.
Indicates a fuse.
Other Symbols
Indicates the prohibited action.
p. )
Indicates the location of reference information.
Indicates quick references for operation and remedies for troubleshoot-
ing.
*
Indicates that descriptive information is provided below.
[ ]
Menus, commands, dialogs, buttons in a dialog, and other names on the
screen and the keys are indicated in brackets.
Unless otherwise specified, "Windows" represents Windows 7, Windows
8, and Windows 10.
Indicates Memory function support.
Indicates FFT Recorder function support.
Safety Information
6
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
7
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).