The Agilent HP 3561A is a single-channel fast-Fourier transform-based network, spectrum and waveform analyser which tests in both in both time and frequency domains. With a frequency range of  DC to 100kHz, 150 dB measurement range and 80 dB dynamic range, it can handle complex test environments.

• 0.000125 Hz to 100 kHz Frequency Range
• Resolution: 0.25% of the frequency span
• 80 dB Dynamic Range
• ± 0.15 dB Amplitude Accuracy
• Amplitude range: +27 dBv to -120 dBv

• Keysight (Agilent) 3561A - Datasheet (294 kB)