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Instrument Options-455/A2/B2
4. Set the HORIZ DISPLAY switch to B D LY 'D . This
displays the portion of the A Sweep display that was
intensified.
5. If there is too much horizontal jitter, set the B SOURCE
switch to TV LINE and the B Slope switch to the same
polarity as the A SLOPE switch. Adjust the B LEVEL con
trol for a stable display.
With the B SOURCE switch set to STARTS AFTER DELAY
and the A COUPLING switch set to TV FIELD, a stable B
Sweep display of equalizing pulses may be d iffic u lt to obtain.
If this is so, trigger B Sweep directly from the signal source.
Use the NORM position of the B SOURCE switch for single
trace displays and the CH 1 or CH 2 positions for dual trace
displays.
V E R T IC A L O P E R A T IN G M O D E S -S P E C IA L
C O N S ID E R A T IO N S
Single Trace Modes
In the CH 1 and CH 2 vertical modes, any A SOURCE switch
position, except LINE, may be used.
If the display is frequently switched between CH 1 and CH 2,
use the NORM position of the A SOURCE switch. This
eliminates the need to change the A SOURCE switch position
each time the display is switched between CH 1 and CH 2.
When using the NORM or CH 2 positions of the A SOURCE
switch, and when viewing Channel 2 inverted (CH 2 INVERT
switch is set to the in position), the normal setting of the A
SLOPE switch is reversed. This is because the trigger signal
is picked o ff the Vertical Preamplifier after inversion. In
this case, set the A SLOPE switch to negative (—) for sync
positive input signals and positive (+) for sync-negative input
signals.
Dual Trace Modes
In the A L T or CHOP modes, all positions of the A SOURCE
switch may be used except LINE and NORM. The sync
separator cannot correctly process the signals supplied from
the normal trigger pickoff. Therefore, stable simultaneous
displays of 2 independent video signals that are not gen-
locked together are not possible.
A D D Mode
Any A SOURCE switch position except LINE may be used.
The CH 1 and CH 2 trigger signals are picked o ff before
signal addition and therefore are not affected by addition.
The normal trigger signal is picked o ff after signal addition
and therefore, is affected by addition.
When using the ADD Mode w ith CH 2 inverted, the CH 1
and CH 2 positions of the A SOURCE switch w ill provide
adequate trigger signals if each individual Channel (when
displayed alone) meets the sensitivity requirements listed in
Table 1.
When the ADD Mode is used to display a full-sized signal
from both sides of a balanced line (CH 2 not inverted), the
NORM position of the A SOURCE switch may be used if
neither signal alone (CH 1 or CH 2 positions of the A SOURCE
switch) is of sufficient amplitude.
When using the ADD mode, the vertical calibration of the
video graticule is valid only if both individual channels are
correctly set up and both VO LTS/D IV switches are set to
the same position.
S E L E C T IN G A N IN D IV ID U A L L IN E 1
The Sync Separator does not differentiate between the 2
fields of an interlaced frame or the 4 fields of a PAL color
frame sequence. However, using a 1-1/2 or 3-1/2 field A
sweep cycle, the display w ill remain locked on a given field
until the trigger signal is interrupted.
One Frame A Sweep Cycle
To display an entire vertical blanking interval and locate a
specific line (e.g., one o f the lines containing a specific
VITS waveform), use the follow ing procedure:
A T IM E /D IV
2 ms
B T IM E /D IV
10 ps
B SOURCE
STARTS AFTER
D ELAY
A TRIGGER HOLDOFF
NORM
HORIZ DISPLAY
A INTEN
A LEVEL
As needed for a
stable display
2. Horizontally position the second vertical blanking interval
to the center of the crt.
1 See Identifying Fields, Frames and Lines in 525/60 and 625/50 TV Systems.
REV. A, O C T 1975
Option 5 Page 3
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 ...