E4990A Help
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Port Extension Status
PEXT or PExt is displayed when Port Extension is turned on and Length or
Time is not zero.
• PEXT: Fixed point
• PExt: User point
Channel Number
Indicates the channel number. To make a channel active, use Channel Next
or Channel Prev. Clicking inside a channel window will also make the
channel active.
Channel Measurement Status
Displays the update status of traces on the channel.
!
Measurement in progress. When the sweep time exceeds
1.5 seconds, ↑ is displayed at the point on the trace.
#
Invalid traces. The measurement conditions have changed,
but the traces on the channel currently displayed have not
been updated to match the new conditions.
(No
display)
The measurement has not been executed.
Channel Title Bar
You can assign a title to each channel and have the title displayed on the
bar.
DC Monitor
DC Monitor values are displayed when the DC monitor function is turned
on.
Equivalent Circuit Model/Simulation Result
Equivalent Circuit Model/Simulation Result are displayed for the equivalent
circuit.
Graticule/Scale Labels
Y-axis divisions in the rectangular display format. When traces in the
rectangular display format are overlaid, the Y-axis divisions for the active
trace are displayed. The value of the reference line (the division line
between and ) is entered numerically by opening the data entry bar
using the keys: Scale > Reference Value. You can change values of the
reference line at one-division intervals by placing the mouse pointer in the
area of the graticule label (the pointer changes from to ), moving the
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