Keysight E4990A - USB Ports

E4990A Help
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To turn off the power of the E4990A, be sure to follow the steps described
below:
1. First, press this standby switch or send a shutdown command from
the external controller to activate the shutdown process (the
processing of software and hardware necessary to turn off the power
supply). This will put the E4990A into the standby state.
2. Next, if necessary, turn off power supply to the Power Cable
Receptacle (to LINE) on the rear panel.
Under normal use, never directly interrupt the power
supply to the power cable receptacle on the rear panel when
the power supply is on. Always keep the Line Switch (Always
ON) at (|). Never turn it off (O).
If you directly interrupt the power supply to the power
cable receptacle when the power supply is on, or turn off
the Line Switch (Always ON), the shutdown process will
not work. This could damage the software and hardware of
the E4990A and lead to device failure.
Turning on the power supply after a faulty shutdown may
cause the system to start up in a condition called "safe
mode." If this occurs, first shut down the system to set it
to the standby state and then turn on the power supply
again to start up the system in normal mode.
UNKNOWN Terminals
These connectors let you connect the instrument with a device under test
(DUT) via test accessories (such as an adapter, test fixture, or cable).
These accessories adopt a four-terminal pair design, thereby enabling
more accurate and wider-range dynamic measurements. Each test
connector has a pair of holes for securing the test accessory to the
instrument.
The test ports comply with Installation Category I of IEC 61010-1.
USB Ports
Two USB (Universal Serial Bus) Ports are provided that can be used for
connecting to USB keyboard, USB mouse, USB memory or a printer.
Connecting a compatible printer to this port enables screen information on
the E4990A to be printed. See Using USB for more detail.
Rear Panel: Names and Functions of Parts