What i mean by mechanical attenuator is this:? The 8644/45 cam with a PIN diode attenuator or, if you have a -002, like mine, you get a mechanical, solenoid driven attenuator.? I've checked the attenuators and yeah all steps work fine. I am checking the drive circuits next.But good point I will check the input.? Like other HP sig gens, the RF power is leveled at the input to the ATTN with an ALC loop. I assume there might be a Cal setting involved.? But running the internal cal should fix that.?
