The frequency of the unknown signal
is
then calculated:
1
Frequency =
---
= 2.083 kHz
480
µS
TV
LINE SIGNAL
The following procedure
is
used to display a
TV
Line
signal:
1.
Preset instrument controls
and
select the A
TRIGGER mode of
P-P
AUTO/TV
LINE.
2.
Apply the
TV
signal to either vertical-channel input
connector
and
set the VERTICAL MODE switches to
display the channel used.
3.
Set the appropriate VOL TS/DIV switch to display
0.3 division or more of composite video signal.
4.
Set the A SEC/DIV switch to 10
µS.
5.
Set the A TRIGGER SLOPE switch to either OUT
(for positive-going TV signal sync pulses) or
IN
(for
- - negative-going
TV
signal sync pulses).
NOTE
To
examine a TV Line signal
in
more detail, either
the X10 Magnifier
or
the Delayed-Sweep
Magnification feature may be
used.
TV
FIELD SIGNAL
The
television feature of the instrument
can
also
be
used to display
TV
Field
signals.
1 . Preset instrument controls
and
obtain a baseline
trace.
2.
Set the A TRIGGER Mode switch to TV FIELD (P-P
AUTO
and
NORM buttons both pushed
in)
and
set the A
SEC/DIV switch to 2
ms.
3.
To display a single field, connect the
TV
signal to
either vertical-channel input connector
and
set the VERTI-
CAL MODE switch to display the channel used.
Basic Applications-2230 Operators
4.
Set the appropriate VOL TS/DIV switch to display
2.5 divisions or more of composite video signal.
5.
Set the A TRIGGER SLOPE switch to either OUT
(for positive-going TV signal sync pulses) or
IN
(for
negative-going TV signal sync pulses).
6.
To change the field that
is
displayed, momentarily
interrupt the trigger signal
by
setting the AC-GND-DC
switch to
GND
and then back to
AC
until the desired field
is displayed.
NOTE
To
examine a TV Field signal
in
more detail, either
the X10 Magnifier
or
the Delayed-Sweep
Magnification feature may be used.
7.
To display a selected horizontal line, first trigger the
sweep
on
a vertical (field) sync pulse, then
use
the
"Magnified Sweep Runs After Delay" procedure
in
this
part (steps 5 through
7)
to magnify the selected horizontal
line for a closer examination. This procedure
is
useful for
examining Vertical Interval Test Signals (VITS).
8.
To display either
Field
1 or
Field
2 individually, con-
nect the
TV
signal to both
CH
1
and
CH
2 input connec-
tors
and
select BOTH
and
ALT VERTICAL MODE.
9.
Set the A SEC/DIV switch to a faster sweep speed
(displays of less than one full field). This will synchronize
the Channel 1 display to one field
and
the Channel 2
display to the other field.
DELA YEO-SWEEP MAGNIFICATION
The delayed-sweep feature of the instrument can
be
used to provide higher apparent magnification than
is
pro-
vided
by
the
X10
Magnifier switch. Apparent magnification
occurs
as
a result of displaying a selected portion of the A
trace at a faster sweep speed
(B
Sweep speed). The A
SEC/DIV switch setting determines how often the B trace
will
be
displayed. Since the B Sweep
can
occur only once
for each A Sweep, the A Sweep time duration sets the
amount of elapsed time between succeeding B Sweeps.
The intensified zone
is
an
indication of both the location
and
length of the B Sweep interval within the A Sweep
interval. Positioning of the intensified zone
(i.e.,
setting the
amount of time between start of the A Sweep
and
the
start of the B Sweep)
is
accomplished with the B DELAY
6-25
To Next Page
Loading...
Need help?
General
