Anrtisu Cell Master MT8212B, Руководство пользователя, Страница: 43 / 294

AMPLITUDE
Choosing AMPLITUDE in Spectrum Analyzer mode causes the soft keys,
below, to be displayed and the corresponding values to be shown in the message
area.
q
Ref Level
— Activates the amplitude reference level function. Valid refer-
ence levels are from +20 to –120 dBm.
q
Scale
— Activates the scale function in a 1 through 15 dB logarithmic ampli-
tude scale. This soft key is not active if the units are set to linear.
q
Atten/Preamp
— Sets the internal input attenuator so that it is either coupled
automatically to the reference level (
Auto
), manually adjustable (
Manual
), dy-
namically coupled to the input signal (
Dynamic
) and provides control for the
preamplifier.
q
Auto
— Sets the input attenuator so that it is coupled automatically to the
reference level.
q
Manual
— Sets the input attenuator manually from 0 to 51 dB.
q
Dynamic
— Sets the input attenuator so that it is dynamically coupled to
the input signal and turns the preamp on or off as necessary.
q
Preamp Control Manual
— Activates the preamp menu.
q
Preamp On/Off
— Sets the preamplifier on or off.
q
Preamp Auto
— Automatically adjusts the preamplifier according to
the reference level.
q
Back
— Returns to the previous menu level.
q
Units
— Choose from the menu of amplitude related units. When Linear is
selected, the available selections are Volts or Watts. When Log is selected,
the selection of dBm sets absolute decibels relative to 1 mW as the amplitude
unit. Selection of dBV, dBmV or dB m V sets absolute decibels relative to 1
volt, 1 millivolt, or 1 microvolt respectively as the amplitude unit.
q
Ref Level Offset
— Sets the reference level offset. This feature allows mea-
surement of high gain devices in combination with an attenuator. It is used to
offset the reference level to view the correct output level. For example, to
measure a high gain amplifier with an output of 70 dBm, an external 50 dB
attenuator must be inserted between the Cell Master and the device. To com-
pensate, set the reference level offset to –50 dB.
MEAS/DISP Choosing MEAS/DISP in Spectrum Analyzer mode causes the soft keys be-
low to be displayed.
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 cou-
pled 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.
q
VBW Manual
— Sets the video bandwidth manually, independent of the
RBW.
Chapter 2 Functions and Operations
2-19