Keysight E4981A 120 Hz/1 kHz/1 MHz Capacitance Meter 13
Unpacking and Preparation
Environmental Requirements
Environmental Requirements
Set up the E4981A where the following environmental requirements are 
satisfied.
Operating environment
Ensure that the operating environment meets the following requirements.
Ventilation requirements
To ensure that the safety requirements, the specifications, and the 
measurement accuracy of the Capacitance meter are met, you must maintain 
the environmental temperature to within the specified range by providing an 
appropriate cooling clearance around the Capacitance meter or, for the 
rack-mounted type, by forcefully air-cooling inside the rack housing. For more 
information on environmental temperatures that satisfy the specifications and 
measurement accuracy of the Capacitance meter, see Chapter 10, “Specifications 
and Supplemental Information,” on page 167. 
The Capacitance meter conforms to the requirements of the safety 
standard.When the environmental temperature around the Capacitance meter 
is kept within the temperature range of the operating environment 
specifications (“Operating environment” on page 13).
The Capacitance meter still conforms to the requirements of the safety 
standard it is installed with the following cooling clearance:
Table 1-1  Operating environment requirements
Temperature 0 °C to 45 °C
Temperature range at 
calibration
23 °C ± 5 °C (|1 °C deviation from the temperature when 
performing calibration)
Humidity (~40 °C, no 
condensation)
15% to 85% RH
Altitude 0 to 2,000 m (0 to 6,561 feet)
Vibration Max. 0.5 G, 5 Hz to 500 Hz
The environmental requirements listed above are NOT for the specifications 
and measurement accuracy of the E4981A, but for its operating 
environment.
Requirements
Back 180 mm
Sides 60 mm (both right and left)