Hello Dave,
in the schematic, the polarity of the diodes in series with the neon
bulbs is definitely wrong.
If you compare with the 3420A on page 7-7 (29), but also with the Fluke
845 which is similar, both neons have to be switched at 180°.
Maybe someone else has erroneously reversed one of the diodes in your
unit before?
If both neons are really firing in phase, instead, that could explain
this non-symmetric waveform, which you observe.
Frank
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