I’m embarrassed to admit how many sampling heads I tried before I realized I had the wrong vertical mode selected.
5. It was 5.
Also the graticule lights just went out, and the readout is on the fritz again (both voltage and time displays are incorrect). I seem to remember that from this mainframe. The Tektronix readout system on the 7k series is the work of a mad genius.
#tektronix #oscilloscope #1980s #retroTech