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HP8714C Noisy Trace on Low Frequencies

Question asked by Rickl on Nov 13, 2008
Latest reply on Dec 10, 2008 by Dr_joel
I have a HP8714C with the attenuator option installed. CW signal is level accross range coming out of the stimulus module but after passing through the attenuator module and directional coupler drops off rapidly below 1 GHz to around -40 dB down by 30 MHz. As a result, the trace is very noisy on the lower frequencies. Seems like something in the signal path has opened up and is rolling off the low end. Any idaes?