• Measurement category III is for measurements performed in the building
installation. Examples are measurements on distribution boards, circuit-breakers,
wiring (including cables, bus-bars, junction boxes, switches and socket-outlets) in
the fixed installation, and equipment for industrial use and some other
equipment. For example, stationary motors with permanent connection to a
fixed installation.
• Measurement category IV is for measurements performed at the source of a
low-voltage installation. Examples are electricity meters and measurements on
primary overcurrent protection devices and ripple control units.
1.4 Ventilation Requirement
This instrument uses a fan to force cooling. Please make sure that the air inlet and
outlet areas are free from obstructions and have free air. When using the instrument
in a bench-top or rack setting, provide at least 10 cm clearance beside, above and
behind the instrument for adequate ventilation.
CAUTION
Inadequate ventilation may cause an increase of temperature in the instrument, which
would cause damage to the instrument. So please keep the instrument well ventilated and
inspect the air outlet and the fan regularly.
1.5 Working Environment
Temperature
Operating: 0℃ to +50℃
Non-operating: -30℃ to +60℃
Humidity
• Operating:
Below +30℃: ≤90%RH (without condensation)
+30℃ to +40℃: ≤75% RH (without condensation)
+40℃ to +50℃: ≤45%RH (without condensation)
• Non-operating:
Below +60℃: ≤90%RH (without condensation)
WARNING
To avoid short circuit inside the instrument or electric shock, never operate the
instrument in a humid environment.
Safety Requirement
DHO900 User Guide
4
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