Ready Indicator; Trigger Mode Switch - Tektronix 2212 User Manual

Trigger
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READY Indicator
The READY LED turns on when the trigger is in SGL
SWEEP trigger mode, and the trigger circuit is armed by
pressing RESET switch, awaiting a triggering event. As soon
as the single sweep has been completed, the READY LED
will be turned off.
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Trigger MODE Switch
The trigger MODE switch of the 2212 selects the Non-Store
sweep triggering modes (P-P AUTO, NORM, SGL SWEEP,
TV LINE or TV FIELD). The Store mode triggering operation
depends on the trigger mode selected and the position of
the SEC/DIV switch (RECORD, ROLL). The LED indicator
for the selected MODE lights.
- P-P AUTO -
In Non-Store mode, P-P AUTO triggering
occurs on a trigger signal that has adequate amplitude
and a repetition rate of about 20 Hz or faster. In the ab-
sence of a proper trigger signal, an autotrigger is gener-
ated, and the sweep runs free. In Store mode, in the
absence of a trigger signal, an auto trigger is also gener-
ated.
The trigger point indicator (intensified dot) is visible on
the generated trace at the position selected by the 25%/
75% pretrigger button.
For SEC/DIV settings of 50 s per division to 0.1 s per
division, the P-P AUTO trigger mode is disabled and the
display rolls. At faster SEC/DIV settings, to the maxi-
mum Store mode setting of 20 µs, triggered acquisitions
occur under the same conditions as Non-Store mode P-P
AUTO triggering.
- NORM - NORM mode triggering permits triggering at
all sweep rates (an auto trigger is not generated in the
absence of an adequate trigger repetition rate).
NOTE
NORM Trigger mode is especially useful for low-fre-
quency and low-repetition-rate signals.
In Detail