Describe the function and use of each of the following controls or sections of the oscilloscope:
a. Focus of voltage trace:
b. Intensity of voltage trace:
c. Vertical and horizontal position controls:
d. Vertical sensitivity:
e. Horizontal sensitivity:
f. Vertical mode selection:
g. AC-GND-DC switch:
h. Beam finder:
i. Calibrate switches:
j. Internal sync:
k. Trigger section:
I. External trigger input:
m. Input resistance and capacitance:
n. Probe:
