TM 11-6625-2735-14-1
SWEEP GENERATORS
TIMING AND HORIZONTAL DISLAY
SWITCHING
General
The Sweep Generators provide several sweep display
modes, dependent upon the horizontal mode selected by
the HORIZ DISPLAY switch. One sweep generator maybe
employed as a delay circuit for a second sweep generator,
permitting a variety of useful display modes. Before the
discussion of sweep generation, it is helpful to become
familiar with each principle mode of horizontal display
and its associated sweep generator, sweep gate and
sweep display labeling. See Table 3-2 for a list of sweep
generator, sweep gate and sweep display terminology
whenever needed throughout the following sweep
generators discussion.
The Sweep Generators produce the sawtooth voltages
that are amplified by the Horizontal Amplifier to provide
horizontal deflection on the CRT. These sawtooth
voltages are produced on command (trigger pulses) from
the Trigger Generator circuits. The Sweep Generator
circuits also produce gate waveforms that are used by the
Z Axis Logic circuit to unblank the CRT during sweep
time, and by the Sweep Logic circuit to terminate sweep
generation. There are three Sweep Generator circuits in
the instrument. Operation of all three is very similar;
therefore only the operation of the Delaying Sweep
Generator and the differences in operation of the three
generators is discussed. Fig. 3-7 shows a detailed block
diagram of the Sweep Generators. A schematic of the
Sweep Generators is shown on Diagram 8 and a schematic
of the Timing And Horizontal Display Switching is shown
on Diagram 9 at the rear of this manual.
TABLE 3-2
Horizontal Display Sweep Generator Terminology
HORIZ DISPLAY
CRT DISPLAY
Gate that
Switch Setting
Portion of Sweep
Sweep Generator
Initiates Swoop
Displayed on CRT
Used for Display
A (TIME/DIV Knobs Locked)
A
Non-Delaying
Main
A (TIME/DIV Knobs Unlocked)
A
Delaying
Main
A (First Portion)
Delaying
Main
MIX
B (Last Portion)
Non-Delaying
Delayed
A
Delaying
Main
A INTEN
B (Intensified
Non-Delaying
Delayed
Portion)
Non-Delaying
B DLY’D
B
(After being delayed Delayed
by Delaying Sweep)
3-16
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