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2.13 Math Functions
The USBscope50 includes two virtual math channels. These
channels are generated using the data from two scope channels
called A and B and a mathematical function, like +, - etc.
The math functions are accessed under the MATH tab.
Note that the voltage range selector knobs may adjust or limit
automatically. This is so that the computed math data cannot be
shown in higher effective resolution than either of the two
constituent channels used in the math. The practical effect of this is
that if you try and turn the voltage selector for a math channel to a
setting that is lower than one or both of the selected channels, the
knob will jump back to the lowest setting allowed. Equally, if you
adjust either of the channels involved in the maths, then the math
channel selector knob will auto adjust to match the lowest setting of
either channel.
The math data computed can also be FFT’d just like the regular
scope channels.
IMPORTANT NOTE: The math functions use the true channel data.
If you invert a channel using the “inv” button, this will have no
effect on the math result. So to get ch1 minus ch2, select “A” as
“1”, select “B” as “2” and select the “fn” as “-“.
Elan Digital Systems Ltd. 28 USBscope50 USER’S GUIDE Iss5