AMPLITUDE Displays the amplitude or scale menu depending on the measurement mode.
Amplitude
Menu
Provides for changing the status window scale. Selected values may be changed
using the Up/Down arrow key or keypad.
Choosing
AMPLITUDE in cable and antenna analyzer measurement modes
causes the soft keys, below, to be displayed and the corresponding values to be
shown in the message area.
q
Top — Opens the top parameter for data entry and provides for setting the
top scale value. Press ENTER when data entry is complete.
q
Bottom — Opens the bottom parameter for data entry and provides for setting
the bottom scale value. Press ENTER when data entry is complete.
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 dBmV 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 Site Master and the device. To com
-
pensate, set the reference level offset to –50 dB.
2-20
Chapter 2 Functions and Operations
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