Forums › SA Series Discussions › SA44B with awkward signals and self test failing › Reply To: SA44B with awkward signals and self test failing October 23, 2016 at 6:51 pm #119276 FernandoParticipantUpdate:The 18dBm peak I was looking at 100kHz, seems to be a DC level or something like that. I can see that even close to 1Hz (see new attached picture) again without anything on the input.Thanks, FernandoAttachments:You must be logged in to view attached files.