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5
Key Reference
Amplitude
Actives the reference level function and access the
associated softkeys to set functions that affect the
way data on the vertical axis is displayed or
corrected.
Ref level
Actives the reference level function.
The reference level is the amplitude power or
voltage represented by the top graticule on the
display. Changing the value of the reference level
changes the absolute amplitude level (in the
selected amplitude units) of the top graticule line.
The reference level can be changed using the arrow
keys, the knob, or the numeric keypad. Pressing
any digit (0 through 9) on the numeric keypad
brings up the terminator menu.
Key Access: [AMPTD]
Attenuation
Toggles the input attenuation between Auto or Man.
The input attenuation ranges from 1dB to 51 dB
and allows you to set the attenuation level in 1 dB
increments when Attenuation is set to Man.
The input attenuator, normally coupled to the
reference level control, reduces the power level of
the analyzer input signal at the input mixer. The
attenuator is recoupled when Attenuation is set to
Auto.
To prevent damage to the input mixer, do not exceed a
CAU T ION
CAU-
power level of +33 dBm at the input. A granted power
level for stable sensitive measurement is less than 20
dBm.
Key Access: [AMPTD]
68
N9340A User's Guide
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