B&K Precision 2532B - Manual - Manual (Page 6)

6
On (Power). This is the In position of the power switch
when instrument is ON.
Off (Power). This is the Out position of the power switch
when instrument is OFF.
This symbol shows that the switch is a power switch located
at the top of the oscilloscope. Pressing this button toggles the
oscilloscope’s state between operation and power off mode.
CAT I
(400V)
IEC Measurement Category I.
Inputs may be connected to
mains (up to 400 VAC) under
Category I overvoltage conditions.