Finally got around to installing the replacement IEC inlet / EMI filter on my spectrum analyzer. Hit the power button and it powered up as it should, thank satan.
Then I ran a signal into it and the results were a bit... strange. It displayed the frequency way offset from what it should be, and there was some weirdness in what was displayed, and the problem was the same on both inputs. So I went into the self-test menu and most stuff was fine, but every test for the digital filter board errored out. Oh dear. It seemed fine and reseating it didn't accomplish anything, so I spent the next c