q
Scale — Activates the scale function in a 1 through 15 dB per division loga-
rithmic amplitude scale. Enter the desired scale using the keypad or
Up/Down arrow key. Press
ENTER
to accept.
q
Atten/Preamp — Sets the Anritsu Spectrum Master input attenuator so that it
is either coupled automatically to the reference level (
Auto
), manually adjust-
able (
Manual
), or dynamically controlled (
Dynamic
).
q
Auto — Press this softkey to automatically couple the attenuation to the
reference level. The automatic attenuation value is displayed to the left of
the display below the
Atten
.
q
Manual — Sets the attenuation to manual mode. The attenuation can be
adjusted from 0 to 51 dB, in 1 dB increments, using the keypad or
Up/Down arrow key. Press
ENTER
to accept the selected value. The
value is displayed to the left of the display below the
Atten*
.
IMPORTANT!
Attenuation is normally a coupled function and is automatically
adjusted when the reference level changes. The reference level will not change
however, when the attenuator changes. The attenuator should be adjusted so
that the maximum signal amplitude at the input mixer is –30 dBm or less. For
example, if the reference level is + 20 dBm, the attenuation should be 50 dB for
an input signal of –30 dBm at the mixer (+20 – 50 = –30). This prevents signal
compression. (This is with the preamplifier off.)
q
Dynamic — Turns on the dynamic attenuation control feature. Dynamic
attenuation tracks the input signal level, automatically adjusting the atten-
uation and preamp to give the maximum dynamic range without com-
pressing the input mixer.
Dynamic attenuation is based on a broadband detector. This means that an
out of band signal may interfere and force the need to use a bandpass fil-
ter to eliminate the out of band interference and enable accurate measure-
ments.
q
Preamp Control Manual — Allows manual control of the preamplifier
on/off state. The
Preamp On/Off
soft key turns the preamplifier on or off.
The
Preamp Auto
soft key returns to automatic control of the
preamplifier.
q
Back — Returns to the previous menu level.
MEAS/DISP
Pressing
MEAS/DISP
in Transmission Measurement mode activates a menu of
bandwidth- and sweep-related functions. Use the corresponding soft key to se-
lect the desired function.
q
Bandwidth
— Activates a menu that allows the resolution and video
bandwidths to be either coupled automatically to the span (Auto) or manually
adjustable (Manual).
q
RBW Auto
— Sets the resolution bandwidth so that it is automatically
coupled to the span.
q
RBW Manual
— Sets the resolution bandwidth manually, independent of
the span.
q
VBW Auto
— Sets the video bandwidth so that it is automatically coupled
to the RBW.
Chapter 2 Functions and Operations
2-39
