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Operating Instructions—455/A2/B2
37
A TRIGGER L E V E L—Selects the amplitude point on
the trigger signal at which the sweep is triggered. It is
usually adjusted fo r the desired display after trigger
SOURCE, COUPLING, and SLOPE have been selected.
3 8
SOURCE—Determines the source of the trigger signal
coupled to the input of the trigger circuit.
3 9
COUPLING—Determines the method used to couple
signals to the trigger generator circuit.
AC: Signals are capacitively coupled to the input
of the trigger generator. Dc is rejected and signals
below about 60 Hz are attenuated.
NORM: The trigger signal is obtained from the
signal(s) displayed on the crt. Does not show the
time-relationship o f the channel 1 and channel 2
signals in the alternate vertical mode. The NORM
setting is not recommended fo r use w ith the
CHOPPED vertical mode because the display
triggers on the switching transients.
CH 1: A sample o f the signal present in the chan
nel 1 preamplifier is used as a trigger signal. The
channel 2 display can be unstable if it is not time-
related to the channel 1 signal.
LF REJ: Signals are capacitively coupled to the
input o f the trigger circuit. Dc is rejected and sig
nals below about 50 kHz are attenuated. It is use
fu l fo r providing a stable display o f the high-frequen
cy components o f a complex waveform.
HF REJ: Signals are capacitively coupled to the
input of the trigger circuit. Dc is rejected and sig
nals below about 60 Hz and above 50 kHz are
attenuated. It is useful fo r providing a stable dis
play o f the low-frequency components o f a com
plex waveform.
CH 2: A sample o f the signal present in the chan
nel 2 preamplifier is used as a trigger signal. The
channel 1 display can be unstable if it is not time-
related to the channel 2 signal.
LINE (A Trigger circuit only): A sample of the
power-line frequency is used as a trigger signal. It
is useful when the input signal is time-related (mul
tiple or sub-multiple) to the line frequency or when
it is desirable to provide a stable display of a line-
frequency component in a complex waveform.
DC: A ll components o f a trigger signal are coupled
to the input o f the trigger circuit. It is useful fo r
providing a stable display o f low-frequency or low-
repetition rate signals.
4 0
POWER—Turns instrument power on (out) and o ff
(in).
EXT: Signals connected to the External Trigger
Input connectors are used fo r triggering. External
trigger signals must be time-related to the displayed
signal fo r a stable display. It is useful when the in
ternal signal is too small or contains undesired
signals that could cause unstable triggering. It is
also useful when operating in the chopped mode.
EXT -f- 10 (A Trigger circuit only): External trig
ger signal attenuated by a factor o f 10.
STARTS AFTER D E LA Y (B Trigger circu it only):
B sweep runs immediately after the delay tim e se
lected by the A T IM E /D IV switch and the D E LA Y
TIM E POS control. No B trigger is required. In any
other B SOURCE switch position, a trigger is re
quired after the delay time before B sweep w ill run.
41
A and B T IM E /D IV -T h e A T IM E /D IV switch (clear
plastic skirt) selects the sweep rate fo r the A sweep
generator circuit and selects the basic delay tim e fo r
delayed sweep operation. M ultiply the A T IM E /D IV
switch setting by the D E LA Y TIM E POS control to
compute the delay time. The VA R control must be
in the detent position fo r calibrated A sweep rate and
delay times.
The B T IM E /D IV switch (grey knob, pull out and turn
to unlock) selects the B sweep rate fo r delayed sweep
operation.
When A T IM E /D IV switch is fu lly counterclockwise
(X-Y position), horizontal deflection is provided by
the signal connected to the vertical CH 1 input
connector.
REV. A. O C T 1975
2-7
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 214: ......
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 ...
Страница 226: ......
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Страница 234: ...455 A2 B2 ...