Vertical Amplifier.

Electronic Principles
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137

Use of a rugged, large scan, 6.5 inch cathode ray tube (crt)

provides for a large, bright display with small spot size, fast

writing speed, and high reliability. The illuminated graticule

is 8 by 10 divisions in size (each division is 1 centimeter

(cm)), and provides for 2 centimeters of linear overscan in each

axis. Of the three plugin compartments, the two on the left

are connected to the vertical deflection circuits and the one on

the right is connected to the horizontal deflection system.

Electronic switching between the vertical amplifiers allows a

dualtrace vertical display. The vertical amplifier can also be

used in the horizontal axis compartment for calibrated xy

displays. The main frame vertical amplifier circuits bandwidth

is greater than 100 megahertz. Regulated dc power supplies

ensure that oscilloscope performance is not affected by

variations in line voltage or frequency, or by changes in the

load caused by varying power requirements.

(2) Vertical Amplifier. The vertical amplifier is a wideband

amplifier (dc to 50 megahertz) that provides vertical deflection

signals to the main frame vertical amplifier circuits. Constant

bandwidth is provided over all of the deflection factor settings

with each setting selectable for either calibrated or

uncalibrated operation. Display polarity is also selectable, as

is the magnification factor. Use of two vertical amplifier

compartments in the main frame allows one amplifier to be used

alone for singletrace operation, or two amplifiers to be used

for dualtrace operation. The vertical amplifier can also be

used in the main frame horizontal axis compartment for

calibrated xy display purposes.

(3) Dual Time Base. The dual time base provides horizontal

deflection signals to the main frame crt circuits for each of

two traces in any four display modes:

(a) Normal,

(b) Intensified delaying,

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Index