Senior Moment

MB-506I killed my frequency counter. I was in a hurry and didn’t check my test configuration.

I forgot the external attenuator.
I forgot to push the -20dB switch.

I rammed so much signal into the 2.4 GHz input that the prescaler (MB-506) died.

It took a while before I could figure out what exactly died. Ever tried to disassemble a quality counter? There’s metal shielding everywhere, not the easiest stuff to remove.

I’m a dumb ass.