Anritsu BTS Master, Руководство пользователя

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2-36 Limit Menu Spectrum Analyzer
2-98 PN: 10580-00349 Rev. M Spectrum Analyzer MG
Limit Move Menu
Key Sequence:
Shift > Limit
(
6
) key
> Limit Move
Move Limit to Current Center Freq: Pressing this submenu key moves the
center of the existing limit line to the center frequency of the measurement.
The span of the existing limit line is not changed by doing this. Use this
submenu key as an easy way to get an existing limit line on screen. If no limit
line is turned on, then a new, flat default limit line is turned on and is located
2.5 grid lines from the top of the screen for the upper limit line or 2.5 grid lines
from the bottom of the screen for the lower limit line.
Move Limit U/D: If the limit line is flat, use this submenu key to move the
limit line to an absolute power point in dBm. If the limit line is not flat, then use
this submenu key to move the limit line up or down by the selected number
of dB. Use the keypad to enter the desired value. The entire line moves by
the amount that is entered. The limit line can also be moved by using the
rotary knob. Turn the rotary knob clockwise to move the line to higher power
levels. The up or down arrows move the limit line by 5% of the screen height.
The left or right arrows move the limit line by 0.2% of the screen height or
0.2 dB when the scale is set to 10 dB/division. The submenu key displays a
zero value after the limit line has been moved.
Move Limit L/R: Pressing this submenu key allows you to adjust the
frequencies of the limit line. All inflection points are moved by the value
entered. The rotary knob can also be used to make this adjustment. Turn the
rotary knob clockwise to move the limit line to higher frequencies. The left or
right arrows move the limit line by 5% of the span while the up or down arrows
move the line by one display pixel. The submenu key displays a zero value
after the limit line has been moved.
Move Limit to Marker 1: Press this submenu key to move the frequency
and amplitude of the center frequency of the limit line to the frequency and
amplitude of Marker 1 (assuming that the Offset from Marker 1 submenu key
is set to 0 dB).
Offset from Marker 1: Press this submenu key to set a limit line offset value
from Marker 1 amplitude. This feature moves the limit line amplitude and
frequency as needed to place the center of the limit line the user-specified
number of dB from the position of Marker 1. Positive values place the limit
line above Marker 1, and negative values place the limit line below Marker 1.
Back: Press this submenu key to return to the “Limit Menu” on page 2-95 .
Figure 2-85. SPA Limit Move Menu
Back
Limit Move
Move Limit
to Current
Center Freq
Move Limit
U/D
0.0 dB
Move Limit
L/R
0 Hz
Move Limit
to Marker 1
Offset from Marker 1
10.0 dB