28 Impedance Analyzer
1 Troubleshooting
Function Specific Troubleshooting
If the Keysight E4991B exhibits a failure symptom that is related
to a specific function or control such as a front panel key control,
data storage, remote control interface, external trigger, external
keyboard or mouse, isolate the trouble using the Function Specific
Troubleshooting procedures described below. The major functions
of the Keysight E4991B and the troubleshooting procedure for
each function are shown in Table 1.
Table 1 Major functions and troubleshooting procedures
Function Description Troubleshooting
Front panel keys All Keysight E4991B functions can be set
and controlled via the front panel keys.
Refer to “To Check the Front
Panel” on page 29
Touch panel The touch screen display on the Keysight
E4991B allows all functions in the menu
bars, setup windows and dialog boxes to
be set by a touch to the screen panel.
Refer to “To Check the
Touch Panel” on page 29
LCD display Almost all the information including the
measurement value, setup state, result
data processing, menu bar, softkey label
and others are indicated on the 10.4-inch
color LCD display.
Refer to “To Check the LCD”
on page 30
External keyboard The external keyboard can be used for the
entry of numerical and character data
when it is connected to the USB connector
on the front or rear panel.
Refer to “To Check the
External Keyboard” on
page 30
Mouse The mouse can be used to move the
pointer on the LCD display, select func-
tions and change settings, when it is con-
nected to the USB connected on the front
or rear panel.
Refer to “To Check the
Mouse” on page 31
External monitor An external color monitor can be used to
display the same information as the Key-
sight E4991B LCD display, when it is con-
nected to the External Monitor Output Port
(15-pin VGA connector) on the rear panel.
Refer to “To Check the
External Monitor Output
Port” on page 31
GPIB Interface The GPIB compatibility allows the Keysight
E4991B to be operated as a talker/listener
on IEEE 488 interface bus.
Refer to “To Check the
GPIB” on page 32
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