13
Figure 11. XY mode examples
3.9.
Mathematics Function
It is possible to do math calculations among the observed signals via math function. By selecting the button
numbered (25), math menu can be accessible (Figure 3c). In the Figure 12, math menu can be seen which
has 2 parts. On the left, gain value can be arranged, while the right side is used to select math function.
Function and gain information are shown in the area numbered (4).
Table 3. Math Function
OFF
Turning off the math function
CH1 + CH2 Addition function (Channel 1 + Channel 2)
CH1 - CH2 Subtraction function (Channel 1
–
Channel 2)
CH2 - CH1
Subtraction function (Channel 2
–
Channel 1)
CH1 * CH2 Multiplication function
CH1 / CH2
Division function (Channel 1 / Channel 2)
CH2 / CH1
Division function (Channel 2 / Channel 1)
CH1 FFT
Fast Fourier Transform for Channel 1
CH2 FFT
Fast Fourier Transform for Channel 2
If the both channels have the same vertical sensitivity value, math operation is made based on voltage. If
the vertical sensibilities differ from each other, the operations are made based on pixel value.
To observe the operation result better, it is possible to multiply with a coefficient. Hence, the gain value on
the left side of the math menu should be changed (Figure 12). At the Table-4, approximate gain value
regarding to the decibel value is shown.
Table 4. Math Function Gain
40 dB
Gain = 100
34 dB
Gain = 50
26 dB
Gain = 20
20 dB
Gain = 10
