BK Precision 2540B, User Manual, Page: 165 / 250

Arbitrary Waveform Generator
165
When the screen data is captured with a 200
pixels vertical resolution, it will internally rescale
and store the arbitrary data to 256 pixels. This
difference in total number of pixels causes the
captured waveform to look different from the
original source. To obtain the closest match
between the captured waveform and its original
source, the signal’s maximum amplitude and
minimum amplitude must be adjusted at the top
edge and bottom edge of the displayable graticule
on screen respectively. For example, if your
original source is a sine wave (either from CH1,
CH2, or MATH source), the displayable maximum
amplitude should be at the very top edge of the
graticule while the displayable minimum
amplitude should be at the very bottom edge of
the graticule. Below is an illustration of this.