Uploaded April 2018 | Updated September 2026, 1 week ago
I put the scope into the X-Y (external) mode and let the equipment warm up. I then connected the hot lead of the signal generator to both the X (horizontal) and Y (vertical) inputs. The signal generator was set to 1000 Hz and then I increased the frequency. I could have started lower in frequency in order to do a more complete check. I stopped testing at 150,000 Hz, which was the limit of my audio generator. At this frequency, the oscilloscope was still showing a straight diagonal line, which indicated both the vertical and horizontal amplifiers of the oscilloscope were still in phase. Severe phase problems would be indicated by an ellipse. Slight phase shifts would be indicated by an opening of the line into 2 curved lines. There were also no bends or smudges, indicating that the amplifiers are linear.
I put the scope into the X-Y (external) mode and let the equipment warm up. I then connected the hot lead of the signal generator to both the X (horizontal) and Y (vertical) inputs. The signal generator was set to 1000 Hz and then I increased the frequency. I could have started lower in frequency in order to do a more complete check. I stopped testing at 150,000 Hz, which was the limit of my audio generator. At this frequency, the oscilloscope was still showing a straight diagonal line, which indicated both the vertical and horizontal amplifiers of the oscilloscope were still in phase. Severe phase problems would be indicated by an ellipse. Slight phase shifts would be indicated by an opening of the line into 2 curved lines. There were also no bends or smudges, indicating that the amplifiers are linear.
