Anrtisu Cell Master MT8212B, User Manual, Page: 65 / 294

AMPLITUDE
Pressing AMPLITUDE in Transmission Measurement mode activates a menu of
amplitude-related functions.
q
Ref Level
— Activates the amplitude reference level function. A specific ref-
erence level can be entered using the keypad or Up/Down arrow key. Press
ENTER to accept the reference level value. Valid reference levels are +20
dBm to –120 dBm.
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 Cell Master input attenuator so that it is ei-
ther coupled automatically to the reference level (
Auto
), manually adjustable
(
Manual
), or dynamically controlled (
Dynamic
).
q
Auto
— Press this soft key 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 ad-
justed 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 dis-
played 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 at-
tenuation tracks the input signal level, automatically adjusting the attenua-
tion and preamp to give the maximum dynamic range without compressing
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 filter
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.
Chapter 2 Functions and Operations
2-41