Anritsu MS2024A/MS2026A User Manual page 90

3-7 VNA Key Functions - Limit Menu
Limit Upper/Lower
This soft key selects which limit line will be active for editing. The limit line that is
currently selected for editing is underlined.
On/Off
This soft key turns the active limit line (upper or lower) on or off.
Limit Edit
The submenu that is displayed by this soft key allows creating or editing of single limit
lines or multi-segment limit lines. The currently active limit point is marked by a red
circle on the display.
Move Limit
This soft key allows an entire single limit line or multi-segment limit line to be
moved up or down by the amount that is entered by using the keypad, the
Up/Down arrow keys, or the rotary knob. The units for this amount will be the
current display units as selected under the
Frequency
The frequency of each point in a limit line can be individually set. When a new
point is added, it takes on a value halfway between two existing points, or the
stop frequency of the current sweep if there is no point higher in frequency than
the one being added. Refer to the
chapter for more details. Use the keypad, the Left/Right arrow keys, or the rotary
knob to change the frequency of a point.
Amplitude
The amplitude of each limit point can also be individually set. By default, when a
new point is added, it takes on the amplitude that is on the limit line at the
frequency where the point was added. Use the keypad, using the ± key as the
minus sign, the Up/Down arrow keys, or the rotary knob to move the point to the
desired value. The unit of the amplitude limit is the same as the current vertical
amplitude unit. Refer to the
more details.
Add Point
The precise behavior of this soft key depends upon which limit point is active at
the time that the key is pressed. If the active limit point is somewhere in the
middle of a multi-segment limit line, then a new limit point will be added
halfway between the currently active point and the point immediately to its
right. The amplitude of the point will be such that it falls on the limit line. For
example, if a limit point is at 2.0 GHz with an amplitude of -30 dBm and the next
point is 3.0 GHz with an amplitude of -50 dBm, then the added point will be at
2.5 GHz with an amplitude of -40 dBm. The frequency and amplitude values of
the new point can be adjusted as needed with the
keys.
If the last limit point is active (assuming that it is not at the right edge of the
display), then the new limit point will be placed at the right edge of the display at
the same amplitude as the point immediately to its left.
Points may not be added beyond the current sweep limits of the instrument.
3-36
Chapter 3 — Vector Network Analyzer
Amplitude
soft key description later in this
Add Point
soft key description in the next section for
Add Point
MS20xxA VNA Master UG 10580-00166 Rev. C
menu.
and
Frequency Amplitude
soft