Keysight (Agilent/HP) 8340B

Frequency range 10 MHz - 26.5 GHz, frequency resolution 1 to 4 Hz, internal time base 10 MHz, analog sweep 100 Hz - 26.49 GHz with sweep periods from 45 ms up to 200 s across the entire range, with sweep widths as narrow as 100 Hz or as wide as the full frequency range. High spectral purity, harmonics (up to 26.5 GHz) of the output frequency