Hi all,
following the recent thread about lowering the IMD of the HP-8640B
turning off the ALC or using a dc level with AM pulse modulation, I've
tried on both my 8640Bs to set AM slide to pulse and injecting a dc
level into the AM BNC, but the output level on the panel meter never
moves, as if I would turn off the output switch.
I've tried different dc levels, up to a few volts and rotating the AM
modulation knob, but nothing seem to have effect.
Are both of my generators broken in the same way or I just don't
understand how this is supposed to work?
Thanks in advance and best regards
Frank IZ8DWF
