gould 400 series scope

No manual at hand? The 450 should still have the "old-Style" knobs on the front panel.

hth, Andreas

No manual. This is an all digital scope. Front panel push buttons adjust the trigger level. These send a sense voltage to an a/d converter in a Motorola microcontroller and where it's converted to digital data. That's where I lose the trail. Apparently, the data is converted to a pulse and sent to the enable input of a one to eight multiplexer with a ramp voltage on the input. The output is integrated into a dc voltage and sent to the trigger chip as the level voltage. The other panel buttons like position , polarity etc.. use the same method and operate properly varying the enable pulse timing with respect to the ramp voltage. I guess I relly need the manual to figure it out. Phil J