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5 - 82 FUNCTION REFERENCE
Source and slope are selected with the same TRIG 1, TRIG .., and EXT TRIG
keys that are used for the main timebase trigger source and slope selection. The
delayed timebase source and slope have their own readout. This readout can be
found at the bottom right corner of the screen, below the readout for the main
timebase trigger source and slope.
If the channel and trigger coupling are the same (e.g., both ac or both dc), the
trigger level is indicated on the screen by D-.
For more details refer to the DEL’D TB section.
Key sequence:
TRIGGER LEVEL
Description:
LEVEL selects the signal level at which the timebase will trigger. For triggering,
the level must be within the peaks of the signal.
TRIGGER LEVEL sets the trigger level for the main timebase. In level-pp ’on’
mode, the level range is clamped within the peak-peak values of the signal. Then
the MTB will always be triggered as shown in the following figure. When level-pp
is ’off’, the level range is from -8 ... +8 divisions.
Leveling in DEL’D TB is adjusted with the ∆ control. It is activated in the triggered
DEL’D TB mode. The range is from -8 ... +8 divisions.
DTB
∆
DEL’D TB
on off
ST6774
9303
starts
trig’d
ac
dc
lf-rej
hf-rej
Toggle softkey to switch DEL’D TB ’on’.
Toggle softkey to select the DEL’D TB trigger mode.
Control to adjust the DEL’D TB trigger level.
Toggle softkey to select the DEL’D TB trigger coupling modes ac, dc,
lf- reject and hf- reject.