Tektronix 465B User Manual

Options—465B Service
Option 05
When the A TRIGGER COUPLING
switch is set to TV
FIELD or TV LINE, the
output of the Sync Separator
is
automatically applied to the A Sweep Trigger
circuits,
and
only
this signal
may be used for triggering the A Sweep.
For B
Sweep,
the horizontal
sync signal (line-rate sync)
from the Separator
is
fed only
to
the
TV LINE
position
on
the B TRIGGEH SOURCE switch, which may
be
selected
at the option of the user.
To
optimize video
measurements, the vertical amplifier
ac input coupling capacitors
are increased from 0.02 to 0 2
microfarad.
The larger physical
size of these capacitors
increases the
input
shunt
capacitance, which is nor-
malized at
24
picofarads.
This following
descriptive text includes the
characteristics, operation,
and maintenance of the added
features
of Option 05 For all other information concerning
the465B Oscilloscope, refertoappropriatesectionsof
the
Operators manual or this Service manual
SPECIFICATION
Electrical
characteristics
and
performance
re-
quirements
listed in
the
Specification
part
of
this manual
are
applicable
to the
465B Option
05 oscilloscope with the
following
exceptions or
additions.
Input
Resistance
1
MQ ±2%
Capacitance
Approximately
24
pF
Time Constant
Approximately
24
ps
AC
Input
Coupling
Low Frequency
3 dB point
Direct
<1 Hz
Via 10X Passive Probe
0
1 Hz
Tilt
(10-ms
pulse)
Direct
<2.5%
Via
10X
Passive
Probe
<0
25%
Triggering
Sync Separation
Stable
video rejection
and sync
separation
from
sync-positive
or
sync-negative
composite
video, 405-
to
819-line,
50 or
60 Hz field rate,
or for
closed-
circuit
systems using
up to 1201
lines,
60 Hz field rate.
Amplitude
(p-p)
Min Max
Internal Composite video
(nominal)* 1.2 div 20
div
Composite sync 0 5 div 20 div
External Composite video
(nominal) 225mV 4 V
Composite sync 75 mV 4 V
Ext/ 10 Composite video
(nominal) 2.25 V
40
V
Composite sync
750 mV
40
V
"Peak video
=
7/3 sync amplitude.
FURNISHED ACCESSORIES
1
Graticule,
NTSC (CCIR System M):
-40
to
+100 units,
with 7 5-unit setup
line; horizontal divisions along line
zero (see
last page of
Option
05
information for part
number).
1 Graticule, CCIR (CCIR System B): zero to +100 units,
35-unit setup line;
horizontal
divisions along
line
30
(see last page of
Option
05
information for part
number).
OPERATING INFORMATION
The following instructions
and information pertain
primarily to the use of the 465B
Option 05 oscilloscope in
TV
applications Refer to preceding sections
of this
manual for use
and operation of the unmodified
instru-
ment.
Installation
of Video Graticule
To install a video
graticule, loosen (about sixturns)
the
four
captive screws holding the crt
bezel in place and
remove the bezel Remove the
light filter from the two
bosses on the bezel and install the
desired graticule on
these bosses, with the marking
on the outside.
NOTE
The extended
tab at the bottom of
the graticule
mates with the
slightly wider (bottom)
margin
of
the
graticule
cover
The
graticule can be moved
slightly horizontally to
align the
external graticule and mask
with the
crt
graticule
and
viewing area
Reinstall the bezel
When the video
graticule
is
installed the
10 horizontal
divisions
along line zero
correspond to the
internal
graticule
divisions, and the
TIME/DIV calibration of the
66 REV B
APR 1980

Tektronix 465B Specifications

General

Brand	Tektronix
Model	465B
Category	Test Equipment
Language	English