Measurement category, W arnin g – KYORITSU 1052 User Manual
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2. Measurement Category
W ARNIN G
n Measurement Category (CAT.)
The restrictions on the maximum voltage level for which the KEW1051, KEW1052 can
be used, depend on the measurement categories specified by the safety standards.
Do not apply any input level higher than maximum allowable input.
AC/DC 1000V
CAT.III
AC/DC 600V
CAT.IV
Measurement
category
Description
Remarks
Ⅰ
CAT. I
For measurements performed on circuits not
directly connected to MAINS.
Ⅱ
CAT. II
For measurements performed on circuits directly
connected to the low voltage installation.
Appliances, portable
equipment, ect.
Ⅲ
CAT.III
For measurements performed in the building
installation.
Distribution board,
circuit breaker, ect.
Ⅳ
CAT.
Ⅳ For measurements performed all the source of the
low-voltage installation.
Overhead wire,
cable systems, ect.
Internal Wiring
Outlet
Entrance
Cable
Fixed Equipment,
etc.
Distribution
Board
CAT. II
Equipment
CAT.I
CAT.IV
CAT. III
Note
Radiation immunity affects the accuracy of the KEW1051, KEW1052 under the
conditions specified in IEC61326-1.
Use of this instrument is limited to domestic, commercial, and light industry
applications. If equipment generating strong electromagnetic interference is located
nearly, the instrument may malfunction.