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How to use a spectrum analyzer to do interference analysis
Release time :2017.12.20 Reading quantity:5 source:Salukirf, original

With the boosting development of wireless communication technology, it is more and more important ensure no interference signal occupy the communication channel. So many handheld spectrum analyzers have been equip with interference analysis function to find out and locate the inference source. In this article, we will introduce how interference analysis works on Saluki S3302 handheld spectrum analyzer.


The interference analyzer mode is an extension of the spectrum analyzer mode. In S3302 series spectrum analyzer, the interference analyzer mode is divided into the following three modes:

l  Spectrum measurement

l  Spectrogram measurement;

l  Received signal strength indicator (RSSI) measurement.


Spectrogram measurement

The cyclic or intermittent signal can be easily observed in the 3D spectrogram display, i.e. frequency, amplitude and time. The time signal amplitudes are reflected by various colors in the spectrogram display.

In order to better observe the measured signal, the following steps can be taken:


1)       Press [Frequency]→[Span]→[Full Span] and [Peak] to obtain the maximum value of the current signal. Then press [Marker→Center] and set the current peak as the center frequency. In this case, the maximum value will be displayed at the center of the trace zone.


2)       Press [BW]→[RBW Auto Man] and set the appropriate resolution bandwidth with the number keys, [↑], [↓] or knob. Similarly, set the appropriate video bandwidth.


3)       Press [Amplitude]→[Ref Level] and set the current maximum point close to the top of the display zone. Press [Scale/Div] and set the appropriate scale/division to facilitate viewing


4)       Press [Auto Save]-> [Sweep Interval] and set the sweep interval.


5)       Press [Sweep Time] and set the record time. Then press [Auto Save Off On] to enable the auto saving mode. In this case, the data will be saved automatically after sweeping of one screen.


6)       Press [Auto Save]→[Time Cursor] and move the horizontal line with the number keys, [↑], [↓] or knob in the vertical direction of the spectrogram. The following spectrogram will display the trace information on the line.


7)       The interference analyzer mode of S3302 series spectrum analyzer involves six independent markers, which are used for reading the amplitude and frequency corresponding of the marker. Specific operations are as follows: [Maker]→[Marker 1 2 3 4 5 6].


8)       Press [Save/Recall]→[Save Pic] to save the current spectrogram information in the picture form.


The spectrogram test UI is shown in Fig. 1


Fig. 1 Interference Analyzer Spectrogram

RSSI measurement

RSSI measurement is mainly applied to measure the strength changes of one CW signal within a certain period.

In order to better observe the measured signal, the following steps can be taken:


1)       Press [Auto Save]→[Sweep Interval] to set the sweep interval, which represents the sweep time between two adjacent points in each sweeping.


2)       Press [Auto Save]→[Sweep Time] to set the span record time. After reaching the set span time, the display interface will not be refreshed.


3)       Press [Auto Save]→[Auto Save Off On] to enable the auto saving function. The data will be automatically saved into the file after sweeping of each screen.


The RSSI test structure is shown in Fig. 2


Fig. 2 RSSI Test Diagram of Interference Analyzer


Now Saluki has following 5 series of spectrum analyzers to fit all your need on spectrum measurements.

S3302 series handheld spectrum analyzer (9kHz - 20GHz / 44GHz)

S3531 series spectrum analyzer (9kHz - 1.8GHz / 3GHz)

S3532 series spectrum analyzer (9kHz - 3.6GHz / 7.5GHz)

S3331 series handheld spectrum analyzer (9kHz - 3.6GHz / 7.5GHz)

S3503 series spectrum analyzer (3Hz - Max 50GHz)