Anritsu Spectrum Master MS2720T, Руководство пользователя

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2-8 Amplitude Menu Chapter 2 —Fixed WiMAX Signal Analyzer
2-18 PN: 10580-00236 Rev. D WiMAX MG
2-8 Amplitude Menu
Key Sequence:
Amplitude
Scale: Press this submenu key to set the scale of the
Y axis on the measurement display. The units are in
dB/div. Scale can be set from 1 dB/div to 15 dB/div. The
default value is 10 dB/div.
When the
Spectral Flatness view is selected, the default
scale value changes to 1 dB/div (the range remains from
1 dB/div to 15 dB/div).
Scale / div: The Scale/div submenu key is displayed
instead of the Scale submenu key only when making
EVM vs Subcarrier and EVM vs Symbol
measurements. The units are in percent (%).
Power Offset: Press this submenu key to have the
instrument
automatically adjust for the loss through any
external cables, attenuators, or couplers. The power can
be offset from –100 dB to +100 dB. To set a power offset,
press the Power Offset submenu key, use the rotary
knob, the arrow keys, or the numeric keypad to enter the
offset value, and press the dB submenu key or the
Enter
key.
Auto Range: When Auto Range is activated, the
reference level is automatically adjusted. Press the Auto
Range submenu key to switch between On and Off.
Adjust Range: When Auto Range is set to the Off state,
press this submenu key to adjust the internal reference
level to be optimal, based on the measured signal. The
Range adjustment is performed once each time the
submenu key is pressed. When Auto Range is set to On,
pressing this submenu key causes Auto Range to be set
to Off.
Note that when the Adjust Range submenu key had been
pressed, the instrument no longer adjusts the internal
gain automatically because Auto Range has been set to
Off by pressing this Adjust Range submenu key. Press
the Auto Range submenu key to toggle the setting to On
in order to resume automatic gain ranging.
Y Axis Max: Press this submenu key to set the
maximum value of the Y axis. In combination with the
Scale control, this allows you to zoom in and zoom out on
the Y axis. This control is available only in the Spectral
Flatness, EVM versus Symbol, and EVM versus
Sub-carrier views.
Figure 2-14. Fixed WiMAX Amplitude Menu
Amplitude
Power Offset
0.0 dB
Adjust
Range
Y Axis Max.
5.00 %
Scale
10 dB/div
Scale / div
0.50 %
Auto Range
On Off
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