Tv Line Signals - Tektronix 2205 Operator's Manual

Applications
TV Line Signals
The following procedure is used to display a TV Line signal.
1. Verify that TRIGGER MODE is set to P-P AUTO/TV LINE.
2. Apply the Television signal to either the CHI or the CH2 input
connector and set the VERTICAL MODE selector to display
the channel used.
3. Set the SEC/DIV control to 10 ps.
4. For positive-going TV signal sync pulses, set the TRIGGER
SLOPE to
-T
and rotate the LEVEL control fully clockwise.
For negative-going sync pulses, set the TRIGGER SLOPE to
and rotate the LEVEL control fully counterclockwise.
(Sonnetimes it may be necessary to move the LEVEL control
slightly clockwise to obtain stable triggering.)
5. Set the appropriate VOLTS/DIV control to display one divi¬
sion or more of composite sync signal.
NOTE
To examine a TV Line signal in more detail, set
HORIZONTAL MAG to X10.
6. To display a selected TV Line pulse, first trigger the sweep
on a TV Field sync pulse. Use the HORIZONTAL POSITION
control to select the desired line pulse, then set HORIZON¬
TAL MAG to XI0.
Z-IVIODULATION
The Z-modulation system can be used to display time markers,
because it depends entirely upon the accuracy of the signal
source. It can also be used in any situation where external con¬
trol of the brightness of some or ail of the trace is required.
The Z, or intensity, modulation feature is operated in the follow¬
ing manner:
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2205 Operator's