Keysight (Agilent/HP) 8340A

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 over the entire range with sweep widths as narrow as 100 Hz or the width of the full frequency range. High spectral purity, harmonics (up to 26.5 GHz) of the output frequency