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Operating Procedures-221 SA
Operators
TELEVISION DISPLAYS
TV Line Signal
The following procedure is used to display a TV Line
signal.
1. Preset instrument controls and select P-P AU TO/TV
LINE A TRIGGER Mode.
2. Apply the TV signal to either vertical-channel input
connector and set the VERTICAL MODE switch to display
the channel used.
3. Set the appropriate VOLTS/DIV switch to display 0.3
division or more of composite sync signal.
4. Set the A SEC/DIV switch to 10
µs.
5. For positive-going TV signal sync pulses,
set
the
A TRIGGER SLOPE switch to OUT and adjust the
A TRIGGER LEVEL
control
to its
fully
clockwise position;
for negative-going TV
signal
sync
pulses, set the
A TRIGGER SLOPE switch to
IN
and adjust the
A TRIGGER LEVEL control to its fully counterclockwise
position.
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 2215A can also be used to
display TV Field signals.
1. Preset instrument controls and
obtain
a baseline
trace.
2. Select TV FIELD A TRIGGER mode (push both P-P
AUTO and NORM buttons in) and
set
the A SEC/DIV switch
to 2 ms.
3. To display a
signal
field, connect the TV signal to
ei-
ther
vertical-channel
input
connector and set the VERTICAL
MODE switch to display the channel used.
4-8
4. Set the appropriate VOLTS/DIV switch to display
1-division or more of composite
sync
signal.
5. For positive-going TV signal sync pulses,
set
the A
TRIGGER SLOPE switch to OUT and adjust the A TRIG-
GER LEVEL
control
to its fully clockwise position; for nega-
tive-going TV signal sync pulses, set the A TRIGGER
SLOPE switch to
IN
and adjust the A TRIGGER LEVEL
control to its fully counterclockwise position.
6. To change the TV field that is displayed, momentarily
interrupt the trigger
signal
by setting the Input Coupling
switch to GND and then back to DC or 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 Magmfication
feature may be used.
7.
To display a selected horizontal line,
first
trigger the
sweep on a vertical (field) sync pulse, then use the
"Magni-
fied 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 connectors
and select BOTH and
ALT
VERTICAL
MODE.
Set the
A SEC/DIV switch to 0.5 ms or
faster
sweep speed (dis-
plays less than one full field). This will synchronize Channel
1 display to one field and Channel 2 to the
other
field.
DELAYED-SWEEP MAGNIFICATION
The delayed-sweep feature
of
the 2215A can be used to
provide
higher
apparent magnification
than
is
provided by
the X1 O 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
dis-
played. Since the B Sweep can occur only once for each A
Sweep, the A Sweep time duration sets the amount of time
elapse 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
inter-
val. Positioning of the intensified zone
(i.e.,
setting the
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