2.13Math 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 |