4
Spectrum Master™ MS2720T Spectrum Analyzer Introduction
Overview (continued)
Interference Analysis
Interference is an ever-growing concern for anyone who
transmits a signal over the air. Spectrum Master is ideally
suited for tracking down interference with its great lineup of
interference measuring capability. Spectrogram shows you
what is happening over time so spotting intermittent interferers
becomes easy. Signal strength measurement, coupled with a
directional antenna, makes finding rogue transmitters much
easier. You can even get an audio indicator of the strength of
the signal so you can find the transmitter without having to
watch the display.
Storage
Measurements, limit lines, JPEG screen shots and setup
files can be stored internally or to an external USB memory.
There is sufficient internal memory to store thousands of
spectrum analyzer traces. By using external USB memory,
tens of thousands of measurements, limit lines and setup files
or hundreds of JPEG screen shots can be saved and easily
transferred onto a computer.
Smart Measurements
The Spectrum Master family has dedicated routines for
one-button measurements of field strength, channel power,
occupied bandwidth, Adjacent Channel Power Ratio (ACPR) and
C/I. These are increasingly critical measurements for today’s
wireless communication systems. The simple interface for
these complex measurements significantly reduces test time
and increases analyzer usability.
Field Strength
By using an antenna for which antenna factors are known,
the instrument calculates the field strength either in dBm/m
2
,
dBV/m, volts/meter, Watts/m
2
, Watts/cm
2
, dBw/m
2
, A/m, or
dbA/m.
Occupied Bandwidth
This measurement determines the amount of spectrum used
by a modulated signal. You can choose between two different
methods of determining bandwidth: the percent of power
method or the “x” dB down method, where “x” can be from
1 dB to 100 dB down the skirts of the signal.
Channel Power
This smart measurement delivers the total power integrated
across a specified channel bandwidth. The user can enter
the center frequency and the channel width or it can be
automatically set by selecting a signal standard and channel
number in the frequency menu.
Adjacent Channel Power Ratio
A common transmitter measurement is that of adjacent
channel leakage power. This is the ratio of the amount of
leakage power in an adjacent channel to the total transmitted
power in the main channel, and is used to replace the
traditional two-tone intermodulation distortion (IMD) test for
system non-linear behavior.
The result of an ACPR measurement can be expressed either
as a power ratio or a power density. In order to calculate
the upper and lower adjacent channel values, the Spectrum
Master allows the adjustment of four parameters to meet
specific measurement needs: main channel center frequency,
measurement channel bandwidth, adjacent channel bandwidth
and channel spacing. When an air interface standard is
specified in the Spectrum Master, all these values are
automatically set to the normal values for that standard.
Spectrogram in Interference Analysis option 25
Built-in Occupied Bandwidth measurement
Adjacent Channel Power Ratio (ACPR) is also built-in
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