Comparison between Keysight Spectrum Analyzer vs Tektronix Spectrum Analyzer vs Rigol Spectrum Analyzer

This page compares spectrum analyzers from Keysight, tektronix and Rigol and mentions comparison between keysight spectrum analyzer, tektronix spectrum analyzer and Rigol spectrum analyzer.

The signal measurement in time domain is done using oscilloscope. Time domain representation does not give frequency insight of the waveform under study. Hence fourier transform is applied to convert time domain waveform to the frequency domain waveform. This will tell energy content of the waveform at different frequency points.

Unlike oscilloscope which plots amplitude versus time, Spectrum Analyzer plots power versus time. Spectrum Analyzer is useful to perform following tests:
• Frequency Vs Power
• Modulation
• Distortion measurements viz. harmonics, spurious, TOI point
• Phase Noise in dBc/Hz
• EVM (Error Vector Magnitude)
• IQ Imbalance

Modern Spectrum Analyzer comes with DSP and advanced signal processing algorithms. This helps in analyzing complex modulated signals transmitted from WLAN, WiMAX, LTE and Zigbee devices.

Here we will compare spectrum analyzers from Keysight (Model: N9322C), tektronix (Model: RSA3408A) and Rigol (Model: DSA875).

Keysight Spectrum Analyzer-N9322C

Following are the specifications of Keysight Spectrum Analyzer (N9322C):
• Frequency: 9KHz to 7 GHz
• Bandwidth (Maximum): 1 MHz
• Phase Noise: -90dBc/Hz @ 1GHz and 10 KHz offset
• Amplitude accuracy: +/-0.6 dB
• TOI: +15 dBm at 1 GHz
• Third Order Dynamic Range (Max.): 83 dB at 1 GHz
• Attenuator Range and Step Size: 50 dB , 1dB
• DANL ( Displayed Average Noise Level) : -152 dBm at 1 GHz
• USB and LAN interfaces
• Applications: Spectral Mask, Spectrogram, Field Strength etc.

Tektronix Spectrum Analyzer-RSA3408A

Following are the specifications of Tektronix Spectrum Analyzer (RSA3408A):
• Frequency: DC to 8 GHz
• Real time Bandwidth: 36 MHz
• Phase Noise: -110dBc/Hz @ 1GHz center frequency and 10 KHz offset
• amplitude accuracy: +/-0.5 dB (RF @ 100MHz, power level: -20dBm)
• P1dB (1 dB compression point) : +2 dBm at 2 GHz
• Attenuator Range: 0 to 55 dB , step size: 5 dB
• Works with analyzer applications for WLAN (802.11a/b/g) , 3G standard based technologies
• Acquisition memory: 16.4MSamples or 65.6 MSamples options available
• Applications: RF and baseband signal analysis and measurements • LAN port

Rigol Spectrum Analyzer-DSA875

Following are the specifications of Rigol Spectrum Analyzer (DSA875):
• Frequency: 9 KHz to 7.5 GHz
• DANL: -161 dBm at 1.5GHz
• Phase Noise: -98 dBc/Hz at 10KHz
• Amplitude uncertainty: less than 0.8 dB
• Bandwidth:
• Measure signals as small as -135dBm
• USB, LAN, GPIB supported
• Applications: useful for RF and baseband measurements viz. Adjacent channel power, power spectral density, occupied bandwidth, emission bandwidth, C/N ratio, harmonic distortion, TOI point etc.

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