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What Functions does S3302 Spectrum Analysis Mode Provide

This article mainly introduces relevant information of the spectrum analysis mode of S3302 series spectrum analyzer, including some typical measurement functions and methods. Users who operates this instrument for the first time can have a general knowledge of these typical applications and the spectrum analysis mode test operations.

Note: Functions mentioned below are under S3302 spectrum analysis mode only.


Fig.1 Main Measurement Functions of S3302 Handheld Spectrum Analyzer

The spectrum analysis mode of S3302 series handheld spectrum analyzer includes a number of complex functions. In addition to basic functions such as the frequency, amplitude, bandwidth average, trace, sweeping and marker parameters, S3302 also provides signal track, noise marker, peak track, counter, list scanner, trigger, limit, field strength measurement, channel power, occupied bandwidth, adjacent channel power, C/N ratio, emission mask, IQ capture, audio monitor, etc.

   ØSignal Track

If a drift signal is tested, the active marker should be placed onto the peak point of the signal by the signal tracking function of the spectrum analyzer. In this case, the marker peak will always be displayed at the center of the spectrum analyzer.

ØNoise marker

The noise marker displays the noise power at which noise near the active marker is normalized to the 1Hz bandwidth. When the noise marker is enabled, the detector is set into the "Sample" mode, and the amplitude scale is set as "Log", the marker reading unit will automatically change into dBm(1Hz) or dB/Hz. When the amplitude scale is set as "Linear", the marker reading unit will automatically change into V(1Hz) or %.

ØPeak Track

When the peak tracking function is enabled, the peak will be searched after each sweeping.


When the frequency counter function is enabled, the marker reading will be made more accurate, which can help to improve the accuracy of frequency measurement. The measurement accuracy is in Hz, and the uncertainty within 10Hz.

ØList Sweep

The list scanner function supports the user to edit the scanning segment, and the spectrum analyzer will scan the edited list based on the set frequency range and other parameters.

List Sweep.bmp

Fig.2  List Sweep


Select the trigger mode under "Sweep" or "Measure", including [Free Run], [Video], [External], [Slope] and [Delay]. User can select the corresponding mode according to needs. When the previous single or continuous sweep finishes, the next sweep or measurement is automatically triggered. Set the trigger mode as [Video]. When the positive slope part of input trigger signal passes through the video trigger level determined by [Trigger Polarity Positive Negative], the sweep will be triggered. In the [external] trigger mode, synchronize the "Sweep" or "Measure" with next voltage cycle.

Ø Limit

The limit function is applied to monitor signals within one band. The spectrum analyzer provides the upper and lower limit. User can set the limits. When the amplitude of one signal within one band exceed the upper limit or lower than the lower limit, the spectrum analyzer will send the alarm signal.

Limit Line.bmp

Fig.3  Limit Function

Ø Field strength measurement

The spectrum analyzer has the function of field strength measurement, including soft menus such as [Field Strength Off On],  [Recall Antenna],  [Edit Antenna] and  [Save Antenna]. The field strength can be rapidly tested with such menus and corresponding test antennas.

Field Strength Measurement.bmp

Fig.4 Field Strength Measurement


The C/N function is applied to measure the ratio of the carrier power to noise power, including the carrier bandwidth, noise bandwidth, offset frequency, span, carrier power, noise power and C/N.

Carrier to Noise Ratio.bmp

Fig.5 C/N Ratio

Ø Emission mask

The emission mask function is applied to recall the limit as the mask to measure whether the signal power exceeds the mask limit. The mask parameter is one limit, the value of which is determined by means of limit recalling. The mask can be moved right and left or up and down according to the center frequency and reference power. In the mask, the limit center is always moved right and left to the center frequency, and also moved up and down to the reference power point based on the calculated reference power. The reference power is divided into the peak power and channel power, which are determined by the reference power.

Emission Mask.bmp

Fig.6  Emission Mask

Ø  IQ capture

The IQ capture function is applied to capture IQ data and save such data into the instrument based on the capture time, sample rate and capture mode set by the user.

Ø Audio monitor

The spectrum analyzer has the tune listening function, which can be applied for radio monitoring. The sound effect can be improved by adjusting the resolution bandwidth during demodulation of the sound difference. In the demodulation mode, the resolution bandwidth should be preferably set as 300kHz-30kHz.