Trigger Source Switch - Tektronix 2212 User Manual

Trigger
- SGL SWEEP -
In SGL SWEEP trigger mode, the single
sweep operation is selected. Pressing the RESET switch
arms the trigger circuitry to accept a trigger event. When a
trigger event is recognized, one single sweep is generated.
NOTE:
To avoid the possibility of losing parts of the signal
display, it is advisable to switch the readout system
off when doing single sweep measurements at SEC!
DIV settings faster than 0.2 ms in NON-STORE mode.
- TV LINE - TV LINE triggering permits stable triggering
on a television line (horizontal sync) signal. The trigger-
ing LEVEL is automatically set. In absence of an adequate
trigger signal, the sweep (or acquisition in Store mode)
free-runs. When TV LINE is selected, "TVLine" is dis-
played in the crt trigger readout field.
- TV FIELD - TV FIELD triggering permits stable trigger-
ing on a television field (vertical sync) signal. In the ab-
sence of an adequate trigger signal, the sweep (or acquisi-
tion in Store mode) free-runs. The 2212 otherwise, be-
haves in TV FIELD mode as in the P-P AUTO trigger
mode. When TV FIELD is selected, "TVFld" is displayed
in the crt trigger readout field.
®
Trigger SOURCE Switch
The trigger SOURCE switch selects the signal SOURCE
(CH 1, VERT MODE, CH 2, LINE, EXT, or EXT:10) of the
trigger signal for the trigger circuit. The LED indicator for the
selected SOURCE lights.
- CH 1 -The Trigger signal is obtained from the CH
1
input
channel. When CH
1
is selected, "CHl" is displayed in
the crt readout.
- VERT MODE - In VERT MODE, trigger signals are ob-
tained alternately from the CH
1
and CH 2 input channels
when the vertical MODE is in AL Ternate. When VERT
MODE is selected, "VERT" is displayed in the crt readout.
In CHOP mode, the trigger signal source is the CH
1
input
signal.
In Store display mode, with the vertical mode in X-Y, the
trigger
SOURCE
is
CH 2.
2212 User Manual
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