Fluke CombiScope PM3370B User Manual page 200

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Key Sequence:
ac dc
lf-rej
hf-rej
TRIGGER
noise
on off
ST6772
9303
ac dc
lf-rej
hf-rej
DTB
ST6773
9303
Toggle softkey to select MAIN TB trigger coupling modes ac, dc,
lf-reject, and hf-reject.
Toggle softkey to switch 'noise' mode for MAIN TB/DEL'D TB.
Toggle softkey to select DEL'D TB trigger coupling modes ac, dc,
lf-reject and hf-reject. Not selectable when 'starts' is active in the
menu under the DTB key.
FUNCTION REFERENCE