B&K Precision 2532B - Manual - Manual (Page 24)

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Menu and Control Button
Channel buttons (CH1, CH2): Press a channel button (CH1 or CH2) 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 10 - Control Buttons