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Instrument Options—455/A2/B2
The output of the sync-separator circuit is supplied to the
A and B trigger generators via the A COUPLING and B
SOURCE switches. The output of the vertical sync recog
nizer is supplied to the A trigger generator via the A COUPL
ING Switch.
INPUT BUFFER A M P LIFIE R
Q2212 is an FET source follower. It provides a high-impe
dance input fo r isolation and a low-impedance output to
drive the input of the Inverting/Non-Inverting Am plifier.
IN V E R T IN G /N O N -IN V E R T IN G A M P LIFIE R
The Inverting/Non-Inverting Am plifier is basically an opera
tional amplifier composed of U2232A, U2232B, and Q2236
(see Fig. 2). The base of U2232A is the inverting input. The
base of U2232B is the non-inverting input. The collector of
Q2236 is the output. R2223 is the feedback resistor. U2232D
provides isolation between the Inverting/Non-Inverting
Am plifier and the sync-separator circuit.
Non-Inverting Operation
Setting the A SLOPE switch to positive (+) connects the base
of U2218A to ground through R2218. This holds o ff U2218
which allows the circuit to operate in the non-inverting mode.
The input signal is supplied to both the inverting and non
inverting inputs of the operational am plifier through 2 voltage
dividers. The signal supplied to the non-inverting input
through voltage divider R2215 and R2217, is about twice
the amplitude of the signal supplied to the inverting input
through voltage divider R2214 and R2232. Therefore, the
net gain of the circuit is about 6 w ith the output signal in
phase w ith the input signal.
Inverting Operation
Setting the A SLOPE switch to negative (—) connects the
base of U2218A to +5 volts through R2218. This turns on
U2218A which effectively shorts the non-inverting input of
the operational amplifier to ground. The net circuit gain is
still
about 6 but
since only the inverting input o f the opera
tional amplifier is being driven, the output signal will be
inverted with respect to the input signal.
SYNC-SEPARATOR C IR C U IT
Emitter follower U2232D buffers the output of the opera
tional amplifier and provides a low-impedance drive to the
input of the sync-separator circuit.
C2242 charges to the positive peak of each sync pulse
through R2242, R2245, and CR2245. When the voltage on
Fig.
Option 5-2.
Inverting/non-inverting amplifier block diagram.
REV.
A,
O C T 1975
Option 5 Page 9
Содержание 455
Страница 1: ...Tektronix 455 A2 B2 PORTABLE OSCILLOSCOPE WITH OPTIONS I N S T R U C T I O N M A N U A L ...
Страница 9: ......
Страница 13: ...455 A2 B2 x 455 A2 B2 Portable Oscilloscope ...
Страница 60: ...Circuit Description 455 A2 B2 Fig 4 3 Attenuator and gain switching sequences 4 8 REV A OCT 1975 ...
Страница 61: ...Circuit Description 455 A2 B2 Fig 4 4 Channel switching gates REV A OCT 1975 4 9 ...
Страница 66: ...Fig 4 6 Sweep generator 1C Function block diagram Circuit Description 455 A2 B2 ...
Страница 80: ...Maintenance 455 A2 B2 BOTTOM FRAME Fig 5 7 VO LTS DIV switch disassembly 5 8 REV A OCT 1975 ...
Страница 90: ...Maintenance 455 A2 B2 Fig 5 13 Troubleshooting chart 5 18 REV A O CT 1975 ...
Страница 91: ...Maintenance 455 A2 B2 1907 1 A Fig 5 13 Troubleshooting chart cont REV A OCT 1975 5 19 ...
Страница 120: ...Instrument Options 455 A2 B2 o j a O Option 5 Page 12 REV B APR 1977 P A R T IA L A 1 0 T R I E R B O A R D ...
Страница 132: ...Instrument Options 455 A2 B2 Option 7 Page 8 REV E AUG 1979 D C TO AC I NVERTER ...
Страница 164: ...455 A2 B2 LARGE 5 INTEGRATED CIRCUITS Fig 9 1 Semiconductor lead identification REV C MAY 1978 ...
Страница 166: ...l 07 7 REV b NOV C M1 4 5 5 MAIN MODULE BLOCK DIAGRAM ...
Страница 167: ...4 5 5 A 2 B 2 AS VERTICAL MODULE IR07 R8 RE V B M O ...
Страница 168: ...I S 0 7 9 8 R E V B NOV IRT7 A2 VERTICAL MODULE BLOCK DIAGRAM ...
Страница 169: ...REV B NOV 1977 Fig 9 2 A1 Partial Interface board compo ...
Страница 170: ...455 A2 B2 Sea Parts List for serial number ranges tial Interface board component locations ...
Страница 173: ...v I m B 2 HORIZONTAL MODULE BLOCK DIAGRAM ...
Страница 174: ...455 A2 B2 REV B NOV 1977 Fig 9 3 A 1 Partial Interface board component locations ...
Страница 182: ...455 A2 B2 Fig 9 4 A20 Vertical board component locations SN B0110 ...
Страница 185: ...455 A2 S2 4 5 5 M A fN M O DULE ...
Страница 187: ...455 A2 B2 Fig 9 5 A20 Vertical board component location SN B010100 B REV C NOV 1977 ...
Страница 191: ...V O L T S 01 ...
Страница 192: ...V O LT S Q IV S H O W N IN 57 H V ...
Страница 198: ... U 1 X SlCjMAt TO P2 A4 h o p it MODULE SEE PARTS LIST FOR SEMICONDUCTOR TYPES f SWITCHING ...
Страница 207: ...A 1 4 B T I M I N G S W I T C H B O A R D A13 A TIM ING SWITCH BOARD 1 9 0 7 3 ...
Страница 209: ...4 5 5 A 2 B 2 B 2 h o r iz o n t a l m o d u l e R o i I 11 R E V C NOV IS77 ...
Страница 212: ...455 A2 B2 0 0 V 2 _______________ 20 mV 50C 1 n5 i d 5 30 m j _ 500 1 n J 1 0 3 V 0 V 3 0 V 1907 117 ...
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Страница 216: ...A B T IM IN G S W IT C H INTERFACE C O N N E C T O R ...
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Страница 224: ...455 A 2 B 2 ...
Страница 225: ... 455 A2 B2 ...
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Страница 234: ...455 A2 B2 ...