Anritsu Spectrum Master MS2720T, User Manual

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Chapter 3 —Mobile WiMAX Signal Analyzer 3-9 Amplitude Menu
WiMAX MG PN: 10580-00236 Rev. D 3-21
3-9 Amplitude Menu
Key Sequence:
Amplitude
Scale: Press this submenu key to set the scale of the
Y axis on the measurement display. Scale can be set from
1 dB/div to 15 dB/div. The default value changes from
10 dB/div to 1 dB/div when the Spectral Flatness view is
selected.
The Scale/div submenu key only appears when making
EVM vs. Subcarrier and EVM vs. Symbol measurements.
All other measurements use the dB/div Scale menu.
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
values, and press the dB submenu key or the
Enter key.
Auto Range: Press this submenu key to toggle the auto
range function On and Off. The active state is underlined
on the submenu key face. When Auto Range is activated
(the default state), the reference level is automatically
adjusted (automatic gain ranging).
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: 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 submenu key. Press the Auto Range
submenu key to toggle its 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 setting allows you to zoom in and zoom out on the
Y-axis.
This control is available in only 4 measurements: OTA
Channel Power Monitor and Demodulator Spectral
flatness, EVM versus Sub Carrier, and EVM versus
Symbol. When the instrument is set up for other
measurements, this submenu key is not displayed.
Figure 3-18. Mobile 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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