Anritsu Spectrum Master MS2720T, User Manual

Page: 417 / 1035

3-13 Amplitude Menu Interference Analyzer (Option 25)
3-38 PN: 10580-00349 Rev. H Spectrum Analyzer MG
3-13 Amplitude Menu
Key Sequence:
Amplitude
Note
On older versions of firmware, the Auto Ref Level function may be accessible only
from the
“Application Options” on page 3-90 , and Units & Detection may appear as
two separate submenu keys.
Auto Ref Level: Press this submenu key to adjust the position of a displayed
signal so that it is approximately two divisions down from the top of the sweep
window, if possible. When the key is pressed, the reference level is adjusted
once. Auto Ref Level may turn off the low-noise front-end preamplifier, but
does not turn it on. It has no effect on vertical scaling.
Reference Level: The reference level is the top graticule line on the display,
and can be set from +30 dBm to –150 dBm. A value may be entered from the
numeric keypad. Use the ± key to toggle between positive and negative
values. After entering the value, press the dBm submenu key or the
Enter
key. The up or down arrow keys change the reference level in 10 dB steps,
and the left or right arrow keys change the value by 1 dB. The rotary knob
changes the value by 0.1 dB per click. The reference level value may be
modified by the reference level offset value to compensate for an external
attenuator or amplifier.
Scale: The scale can be set in 1 dB steps from 1 dB per division to 15 dB per
division. The value can be changed using the keypad, the rotary knob, or the
arrow keys.
Auto Atten On/Off: Input attenuation can be either tied to the reference
level (On) or manually selected (Off). When input attenuation is tied to the
reference level, attenuation is increased as higher reference levels are
selected to make sure the instrument input circuits are not saturated by large
signals that are likely to be present when high reference levels are required.
Atten Lvl: Press this submenu key and use the numeric keypad, the rotary
knob, or the arrow keys to change the attenuation value.
RL Offset xx dB Ext Gain/Loss: RL Offset compensates for the presence
of external input attenuation or gain. Enter a positive value to compensate for
gain or loss, then press the appropriate submenu key (dB External Gain or dB
External Loss). The new RL Offset value will be displayed on the button.
Pre Amp On/Off: This submenu key turns the low-noise front-end
preamplifier on or off. To ensure accurate measurement results, the largest
signal into the instrument input when the preamplifier is turned on should be
less than –40 dBm.
Units & Detection: Press this submenu key to open the “Units & Detection
Menu” on page 3-39 .
Figure 3-31. SPA Amplitude Menu
Amplitude
Reference Level
10 dBm
Auto Atten
On Off
Auto Ref Level
RL Offset
0.0 dB Ext Gain
Units & Detection
Scale
10 dB/div
Pre Amp
On Off
Atten Lvl
30.0 dB
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