BK Precision 2194 - Math Function Operation; Differentiate

Math 93
9.3 Math Function Operation
The oscilloscope supports math function operation including dierential (d/dt), integral (
∫
𝑑𝑡) and square root (
√
).
9.3.1 Dierentiate
𝑑𝑖 =
𝑦(𝑖+ Δ𝑡)−𝑦(𝑖−Δ𝑡)
2Δ𝑡
d/dt (dierentiate) calculates the discrete time derivative of the selected source. Where:
• d = dierential waveform
• y = channel 1, 2, 3, or 4 data points
• i = data point index
• Δ t = point- to- point time dierence
The dx option under d/dt math function operation menu shows the point- to- point time dierence, and it ranges from
0.02div to 0.40div. “div” indicates the number of the pixel points that each division has. The oscilloscope has 50 pixel
points per division. Take 0.2div as an example: 0.2*50 = 10. It means to calculate the ten point’s discrete time derivative
of the selected source, and the Δ t is the ten point’s point-to-point time dierence.
Figure 9.12 Dierence Function Operation
You can use dierentiate to measure the instantaneous slope of a waveform. For example, the slew rate of an operational
amplier may be measured using the dierentiate function
Note:
Because dierentiation is very sensitive to noise, it is helpful to set acquisition mode to Average.