Tektronix 2247A Operator's Manual page 200

Performance Check Procedure
NOTE
Set:
A Trigger CPLG DC
Horlzontal MODE B
A/B SELECT B Trigger
B Trigger MODE NORM
B Trigger SOURCE VERT
B Trigger SLOPE ~~ (positive-
going)
B SEC/DIV 0.5 ms
DELAY Time 20.000
(minimum
delay time)
BINTEN For viewable
display
NOTE
a display.
Disconnect the test setup from the CH 1 input.