Tv Line Signals; Z-Modulation - 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 p.s.
4. For positive-going TV signal sync pulses, set the TRIGGER
- T
SLOPE to
For negative-going sync pulses, set the TRIGGER SLOPE to
" V_ and rotate the LEVEL control fully counterclockwise.
(Sometimes 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.
To examine a TV Line signal in more detail, set
HORIZONTAL MAG to X I 0.
6. To display a selected TV Line pulse, first trigger the sweep
on a TV Field sync pulse.
control to select the desired line pulse, then set HORIZON­
TAL MAG to X I 0.

Z-MODULATION

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 all of the trace is required.
The Z, or intensity, modulation feature is operated in the follow­
ing manner:
3-18
and rotate the LEVEL control fully clockwise.
NOTE
Use the HORIZONTAL POSITION
2205 Operator's