CEM DT-9989, User Manual, Page: 7 / 68

OVERVOLTAGE CATEGORY III
Note
OVERVOLTAGE CATEGORY IV
Note
Equipment of OVERVOLTAGE CATEGORY III is equipment in fixed installations.
– Examples include switches in the fixed installation and some equipment for industrial
use with permanent connection to the fixed installation.
Equipment of OVERVOLTAGE CATEGORY IV is for use at the origin of the installation.
– Examples include electricity meters and primary over-current protection equipment
3.Safety Instructions
This meter has been designed for safe use, but must be operated with caution.
The rules listed below must be carefully followed for safe operation.
apply voltage or current to the meter that exceeds the specified maximum:
when working with high voltages.
measure voltage if the voltage on the “COM” input jack exceeds 1000V above
earth ground.
connect the meter leads across a voltage source while the function switch is
in the current, resistance, or diode mode. Doing so can damage the meter.
discharge filter capacitors in power supplies and disconnect the power when
making resistance or diode tests.
turn off the power and disconnect the test leads before opening the covers to
replace the fuse or batteries.
3-1.NEVER
3- .USE EXTREME CAUTION
3- .DO NOT
3- .NEVER
3- .ALWAYS
3- .ALWAYS
2
3
4
5
6
Maximum Input
1000VDC/AC RMS
500mA 1000V fast acting fuse
10A 1000V fast acting fuse
(20A for 30 seconds max every
15 minutes)
1000VDC/AC rms
1000VDC/AC rms
Input Protection Limits
Function
V DC or V AC
mA AC/DC
A AC/DC
Frequency, Resistance, Capacitance,
Duty Cycle, Diode Test, Continuity
Temperature
Surge Protection: 8kV peak per IEC 61010
OVERVOLTAGE CATEGORY II
Note
Equipment of OVERVOLTAGE CATEGORY II is energy-consuming equipment to be supplied
from the fixed installation.
– Examples include household, office, and laboratory appliances.
7
True RMS Multimeter