The E4407B is Agilent's 26.5 GHz spectrum analyzer. A spectrum analyzer measures the spectral power of known and unknown signals. It collects information such as the amplitude of the input signal relative to its frequency. As a frequency analyzer, the primary use of a spectrum analyzer is to record and analyze the spectral components of electrical input signals and other signals.

Additional features:

Frequency range: 9 kHz–26.5 GHz
Rugged and portable, delivering lab-grade performance in the field
1 ms RF sweep time, 45 measurements per second
RMS, peak, negative peak, and quasi-peak detectors
±0.4 dB overall amplitude accuracy
Optional 1 Hz digital resolution bandwidth filter and preamplifier
-166 dBm sensitivity with internal preamplifier, +12.5 dBm TOI
Maximum frequency coverage up to 325 GHz with external mixing
Variable sweep (trace points) from 2 to 8192
Segmented sweep with up to 32 non-contiguous spans in a single sweep
Agilent E4407B's one-button measurement solutions, combined with its easy-to-navigate user interface and speed performance, allow engineers to spend less time testing and more time designing, building, and troubleshooting components and products.