B&K Precision 2552-2559 - Manual - Manual (Page 21)

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Menu and Control Button
Channel buttons (CH1, CH2, CH3, CH4): Press a channel button (CH1,
CH2, CH3, or CH4) to turn that channel ON or OFF and open the Channel
menu for that channel. You can use the channel menu to set up a channel.
When the channel is ON, the channel button is lit.
MATH: Press to display the Math menu. You can use the MATH menu to
use the oscilloscope’s Math functions.
REF: Press to display the Ref Wave menu. You can use this menu to save
and recall reference waveforms to and from internal memory.
Figure 11 - Control Buttons (4CH model shown)