Fluke Oscilloscope Calibration Manual page 14

AC/DC
A
B
Trigger
Mode
A
B
Ext
Line
V/cm
-
Level
Timebase with
sawtooth generator
Oscilloscope Calibration Techniques
Y-Pos
ALT/CHOP
switch
Delay
R R
1 2
dY
sec/cm X-Pos
+
dX