Time-Base Generator; General - Tektronix 7B70 Time Base Instruction Manual

Circuit Description-7B7O (SN B205000 and Up)
Fig. 3-4. Sweep Generator block diagram.
TO OSCl LLOSCOPE
TIME-BASE GENERATOR
push-pull by the Horizontal Preamp and used by the Indica-
General
tor Oscilloscope to provide horizontal sweep deflection on
the CRT. In addition this circuit produces various control
The Time-Base Generator circuit (see Fig. 3-4) produces
signals for use by the Indicator Oscilloscope as well as inter-
a sawtooth voltage which i s changed from single-ended to
nal signals for use in the Plug-in.
SWEEP START
GATE
DISCONNECT
AMPLIFIER
0 5 2 6
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77 CT
SAWTOOTH
SWEEP SAWTOOTH
GENERATOR
=
-
TO
RT
0 5 3 2 0 5 3 3
HORIZONTAL
0 5 3 4 0 5 3 7
PREAMP
-50 V
SWEEP START
AMPLIFIER
0592, 0 5 9 4
-1
SWEEP STOP
COMPARATOR
0406, 0 4 0 8
-
HOLDOFF
AMPLIFIER
AND CAPACITOR
0582. C580
RESET TO
SWEEP GATE STAGE
-
-
,
SWEEP RESET
MULTIVIBRATOR
0432. 0 4 3 6
REMOTE
SWEEP HOLDOFF
MULTIVIBRATOR
0554, 0 5 6 4
0 5 6 6
1 1
I
,
i
A
I
zHOLDOFF
:
TO
!,
OSCl LLOSCOPE
READY LIGHT
-
READY LIGHT
CIRCUIT
-
0 4 4 2 . 0 4 4 6
-
SINGLE SWEEP
RESET
AMPLIFIER
0454.0456
REMOTE RESET SWEEP
INHIBIT
COMPARATOR
0410,0416,0424
RESET
CONTROL
AMPLIFIER
0 4 6 8
-
C
SWEEP INHIBIT
t
7
D E L A Y MODE CONTROL
-
d
HOLDOFF
DISCONNECT
DIODE
CR571