545

The 545 is a 33MHz scope that takes a letter-series or 1-series vertical plug-in. It has two timebases which allows delayed triggering. There was the 545, then the 545A, then the 545B. The 545A improved the control ergonomics significantly but did not embody any major design changes. The 545B has a transistor vertical output, and uses the same CRT as the 544, 546, and 547.