Motorola R-2002A Manual page 59

A 12 FRONT PANEL
INTERFACE
EXT
__.;;49+-------1
HORIZ
VERT
INPUT
AMP
VERT
POSITION -
4
+-+---------'
VERT 5.6
GAIN
24
A9
PROCESSOR
CHAR GEN
50 43
88 16
74
SPECT 27 I
ANA
I
::"'?:!;
455
91
IF
CONTROL
87
DEMOD
79
CAL AUDIO
MOD
69
CAL AUDIO
591
CARRIER • MOD LVL
11511-42
Figure 5-11. Oscilloscope Block Diagram
5-87. The horizontal amplifier input is selected between external and internal scope functions. External
functions, Time base Generator or external horizontal input, are switched to a sumation amp where the
HORIZONTAL POSITION signal from the front panel is added. The resulting DC offset positions the display
horizontally on the CRT.
5-88. Six decade sweep ranges from 1J1 sec to 100 msec per division are provided by the Time base
Generator. Control of the Time base Generator is from the front panel horizontal switch through the processor.
5-89. Front panel external horizontal inputs are applied to the top of the horizontal vernier gain
potentiometer. The wiper of the gain potentiometer is the EXTERNAL HORIZONTAL input signal to the
5-20
-
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