B&K Precision 2552-2559 - Manual - Manual (Page 140)

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6. Press the “Operation” option button and select “－”.
7. Press the “CH1－CH2” option button to display a new waveform
that is the difference between the displayed waveforms.
8. You can adjust the vertical scale and position of the Math
waveform. To do so, follow these steps:
a. Remove the channel 1 and channel 2 waveforms from the
display.
b. Turn the CH 1 and CH 2 VOLTS/DIV and VERTICAL
POSITION knobs to adjust the vertical scale and position.
NOTE. First be sure to compensate both probes. Differences in probe
compensation appear as errors in the differential signal.