Spectrum Analyzer Specifications

A spectrum analyzer displays the frequency components of signals.

Used by scientists and technicians, a spectrum analyzer reveals the strength of frequency components in electronic signals. It shows the characteristics in real time on a graphic display. Simpler ones work with audio signals and high-end units analyze radio frequencies.

Frequency Range

Spectrum analyzers specialize in specific frequency ranges. An audio spectrum analyzer work in the range of zero to about 100 kilohertz (khz). Radio analyzers handle from 100 Khz to several gigahertz (Ghz). Some microwave units top out at 40 Ghz.

Sensitivity

Some analyzers receive signals directly from a radio antenna. Here, it must have extremely low internal noise so it won't interfere with the signal you're reading. The manufacturer specifies sensitivity in decibel milliwatts (dBm, sometimes dBmw) such as150 dBm.

Sweep Speed

The spectrum analyzer continuously sweeps a frequency range you select. Fast sweep times give you the most accurate spectrum display. Also, frequent sweeps give you a better grasp of signal changes. A typical analyzer takes one millisecond to sweep the range and does it 45 times per second.

References

• Radio Electronics: Understanding Spectrum Analyzer Specifications
• Anritsu USA: Guide to Spectrum Analyzers
• Test Mart: Agilent Technologies Inc E4407B Technical Specifications