Tektronix 2221A User Manual

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Triggering with an Externa! Signal
Trigger one- or two-channel displays with an externally applied signal using
the following procedure:
□ Step 1: Apply the external signal to the EXT INPUT connector using a
coaxial cable.
□ Step 2: Set the SOURCE to EXT
□ Step 3: Select the EXT COUPL mode: AC, DC, or DC ™ 10.
□ Step 4: Adjust the TRIGGER LEVEL for a stable display.
Triggering on TV Signals
You can trigger on either TV line or TV field signals.
Triggering on a TV Line Signal
H Step 1: Push in the P-P AUTO/TV LINE trigger mode button.
□ Step 2: Apply the TV signal to a channel input and display the channel.
□ Step 3: Set the VOLTS/DIV switch to display 0.3 or more of composite
video signal.
P I Step 4: Set the SEC/DIV switch to 10 ps.
P I Step 5: Set the TRIGGER SLOPE switch either out (for positive-going
TV Signal sync pulses) or in (for negative-going TV signal sync pulses).
□ Step 6: Adjust the TRIGGER LEVEL stabilize the display (Figure 3-27).
a u i
= 0 .f
i 0 0 u
TRIG 0 =
SRFT '
8 .2Ej
A
U 4T = 0
!
6 xl.s
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r
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I f
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i f
in* * t
A
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L j
0.5 U
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U s
Figure 3-27: Multi-burst Signal Triggered in TV Line
Triggering on TV Field
□ Stepl: Set the TRIGGER Mode to TV FIELD. (Press the P-P AUTO and
NORM mode buttons in at the same time.)
3-28
In Detail

Tektronix 2221A Specifications

General

Brand	Tektronix
Model	2221A
Category	Test Equipment
Language	English