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signal input connector of another device, the device can be phase-locked to
the internal reference signal of the E4990A and used under this condition.
High Stability Frequency Reference Output (REF OVEN, OPT 1E5)
When Option 1E5 (high stability time base) is installed, the reference
signal is output from this connector. Connect this connector to the REF IN
by using the BNC(m)-BNC(m) adapter included with the option.
Line Switch (Always ON)
Always keep this switch on (|).
Do not use this switch to turn off (O) the mains. Doing so
may cause the analyzer to fail. For more information, see the
description of the Standby Switch.
Power Cable Receptacle (to LINE)
The receptacle (outlet) to which the power cable is connected.
To connect the device to a power source (outlet), use the
supplied three-prong power cable with a ground conductor. The plug
attached to the power cable (on the power outlet side or device side
of the cable) serves as the disconnecting device (device that cuts off
power supply) of the E4990A. When the power supply must be cut
off to avoid such danger as electric shock, pull out the power cable
plug (on the power outlet side or device side of the cable). For the
procedure for turning off the main in normal use, see the description
in Standby Switch.
For more on the power supply, see the Installation Guide.
Serial Number Plate
The label showing the product number, serial number and the installed
option number. The accessary and system rack options are not listed on
this label. (CFGxxx or ATOxxx in the first line is Agilent Use Only.)
USB Interface Port (USBTMC)
Through this port, you can control the E4990A from external controllers.
For more information on the measurement system using the USB port, see
the USB Remote Control System.
Specification Value
Connector type
Universal serial bus (USB), type B (4 contact
positions), Female (jack)
Compliance
Standards
USBTMC-USB488 and USB2.0
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