Keysight E4990A - Page 247

Product Information
237
written after shipment from the
factory (LAN setup, etc.)to be
initialized to the state at the time of
shipment. The programs and data
stored in Drive D (user directory) are
erased.
Main fan
50,000 operating hours. The service
life may be significantly shorter when
used in a dusty and dirty
environment.
5 years
CPU fan
Battery on
Mother
board
50,000 operating hours. The service
life may be shorter if E4990A power
has not been turned on for long time.
5 years
Power
supply
50,000 operating hours (Depends on
the service life of the power supply
cooling fun) The service life may be
significantly shorter when used in a
dusty and dirty environment.
5 years
LCD screen
backlight
50,000 operating hours. When the
unit is used for automatic
measurements in a production line
and the on-screen information is not
required, the life of the LCD backlight
can be saved by turning it OFF. As for
the method of turning the backlight
OFF, refer to Turning OFF the LCD
Screen Backlight.
5 years
Touch
screen
(function)
One million times (dotting life) 5 years
USB
receptacle
1,500 cycles insertion/extraction. The
service life may be shorter when
used in a dusty and dirty
environment. In case that the
insertion/extraction is in heavy usage
such as USB memory stick, using
USB extension cable may save the
USB receptacle life.
N/A