This EIP 545A has 3 inputs, band 1, 2 and 3. Band A measures from 10 Hz to 100Mhz, Band 2 measures from 10Mhz to 1 Ghz and Band 3 measures from 1 Ghz to 18 Ghz. I have tested all these inputs at various frequencies and output levels and they all seem to work fine. It has options 02,04, and 08. 02 is a power meter, 04 is medium stability oven for timebase, and 08 is GPIB.