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Operating Instructions—4 5 5 /A 2 /B 2
3 0
HORIZ DISPLAY—Determines the mode o f operation
fo r the horizontal deflection system.
A: Horizontal deflection is provided by the A
sweep generator at a rate determined by the A
T IM E /D IV switch. The B sweep generator is
inoperative.
A INTEN: Horizontal deflection is provided by
the A sweep generator at a rate determined by the
A T IM E /D IV switch. The B sweep generator is
running to produce an intensified zone on the A
sweep display. The location o f the intensified
zone is determined by the D ELAY TIM E POS
control. The duration of the intensified zone is
about 10 times the B T IM E /D IV switch setting
except when the intensified zone is positioned
where A sweep ends before B sweep. The A INTEN
mode is useful fo r determining the portion o f the
A sweep display which is presented in the B D LY 'D
mode. The A INTEN mode also can be used to
make differential time measurements (see A p p li
cations in this section).
B D LY 'D : Horizontal deflection is provided by
the B sweep generator at a rate determined by the
B T IM E /D IV switch. The A sweep generator con
tinues to operate. With the B SOURCE switch set
to STARTS AFTER D ELAY, the start of B sweep
is delayed from the start o f A sweep by a time de
termined by the A T IM E /D IV switch and the
DELAY TIM E POS control. In other positions
of the B SOURCE switch, the start o f B sweep is
further delayed u ntil a trigger signal occurs. To
find the duration o f this delay, m u ltip ly the A
T IM E /D IV switch setting by the D ELAY TIM E
POS control setting.
NORM: With the proper A TRIGGER LEVEL con
tro l setting, A sweep can be initiated by trigger sig
nals w ith in the frequency range set by the A
COUPLING switch. In the absence of an adequate
trigger signal, or when the A TRIGGER LEVEL
control is misadjusted, the A sweep generator does
not run and no display is visible. Use the NORM
mode when the trigger signal repetition rate is too
low fo r the AUTO mode indicated by the TRIG
light blinking.
SGL SWP: The SGL SWP switch is a momentary
contact, spring return push button switch. When
the SGL SWP button is pushed, the A Trigger cir
cuit operates in the same manner as in the NORM
mode. However, upon receipt of an adequate trig
ger signal, only one sweep is presented. Another
single sweep cannot be presented until the SGL
SWP button is pushed again.
32
POSITION—Positions the display horizontally except
in the X-Y mode (A T IM E /D IV switch fu lly counter
clockwise). In the X-Y mode, the vertical amplifier
CH 1 POSITION control positions the display hori
zontally.
3 3
X10 M AG—Increases the displayed sweep rate by a
factor of 10. It extends the fastest sweep rate to 5
ns/div. The magnified sweep is the center division
o f the unmagnified display (0.5 division either side
o f the graticule vertical center line).
3 4
A TRIGGER HO LDO FF—Provides continuous control
o f the tim e between sweeps. Allows triggering on
aperiodic signals (such as complex digital words). Use
the A trigger controls fo r the best possible display be
fore using the A TR IG HOLDOFF control.
31
TRIG MODE—Determines the mode o f operation fo r
the A Trigger circuit.
3 5
External Trigger Input—Input connector fo r external
trigger signals.
AU TO : With the proper A LEVE L control setting,
A sweep can be initiated by trigger signals w ith
repetition rates above about 20 Hz and w ith in the
frequency range determined by the setting o f the
A COUPLING switch. In the absence o f an ade
quate trigger signal, or when the A LEVE L control
is misadjusted, the A sweep generator free runs to
provide a reference display. If the trigger signal
repetition rate is too low (or TR IG indicator blinks),
set the TRIG MODE switch to NORM.
3 6
SLOPE—Selects the slope o f the trigger signal that
starts the sweep.
OUT: +: Sweep can be triggered from the positive
going portion o f a trigger signal.
IN: —: Sweep can be triggered from the negative
going portion o f a trigger signal.
2-6
REV. A. O C T 1975
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 ...
Страница 223: ... ...
Страница 224: ...455 A 2 B 2 ...
Страница 225: ... 455 A2 B2 ...
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Страница 234: ...455 A2 B2 ...