1. Acquisition system
sample rate
采样时间=存储深度/采样率
采样时间=时基(T/div)$*10 div$ 即整个屏幕范围内的时间总长度
采集满一个屏幕，时基一定，采集一屏的时间就一定，从而决定存储深度和采样率 –>采样率=存储深度/采样时间=14M/(10ms/div * 10div)
为什么导出的波形数据时间从负开始，因为触发点时刻t=0，触发点之前是预触发数据。可调节波形水平位移，把触发点放到屏幕最左边那列像素
示波器如何不更改采样率的前提下，更改时基？ - 知乎用户的回答 - 知乎 https://www.zhihu.com/question/333507566/answer/739169780 关于示波器的采样率三个问题 - 知乎 (zhihu.com)
memory depth
waveform interpolation
2. Input
channels
coupling
impedance
3. Vertical System
bandwidth
vertical resolution
4. Horizontal System
5. Trigger System
coupling
| mode | frequency response |
|---|---|
| DC | pass all components of the signal |
| AC | block DC components and attenuate signal below 8Hz |
| LFRJ | block DC components and attenuate low-frequency components below 2MHz |
| HFRJ | attenuate high-frequency components above 1.2 MHz |
| Noise RJ |
Type
- edge trigger
- slope trigger
- pulse width trigger
- video
- windows
- interval
- dropout
- runt
- pattern
- serial
- I2C
- SPI
- UART
- CAN
- LIN
6. Measurement
Ref:
Vertical
| Parameters | Meaning |
|---|---|
| max | Highest value in input waveform |
| min | Lowest value in input waveform |
| pk-pk | Difference between maximum and minimum data values |
| ampl | Difference between top and base in a bimodal signal, or between max and min in an unimodal signal |
| top | Value of most probable higher state in a bimodal waveform |
| base | Value of most probable lower state in a bimodal waveform |
| mean | Average of all data values |
| cmean | Average of all data values in the first cycle |
| stdev | Standard deviation of all data values |
| cstd | Standard deviation of all data values in the first cycle |
| vrms | Root mean square of all data values |
| crms | Root mean square of all data values in the first cycle |
| fov | Overshoot after a falling edge;(base -min)/Amplitude |
| rov | Overshoot after a rising edge;(max-top)/Amplitude |
| fpre | Overshoot after a falling edge;(max-top)/Amplitude |
| rpre | Overshoot after a rising edge;(base -min)/Amplitude |
| level@X | the voltage value of the trigger point |
Horizontal
| Parameters | Meaning |
|---|---|
| Period | Time between the middle threshold points of two consecutive, likepolarity edges |
| Freq | Reciprocal of period |
| +Wid | Width measured at 50% level and positive slope |
| -Wid | Width measured at 50% level and negative slope |
| Rise Time | Duration of rising edge from 10-90% |
| Fall Time | Duration of falling edge from 90-10% |
| Bwid | Time from the first rising edge to the last falling edge, or the first falling edge to the last rising edge at the “50%” crossing |
| +Dut | Time difference between the “50%” threshold of a rising edge to the “50% threshold of the next falling edge of the pulse |
| -Dut | Time difference between the “50%” threshold of a falling edge to the “50% threshold of the next rising edge of the pulse |
| Delay | Time from the trigger to the first transition at the 50% crossing |
| Time@Level | Time from the trigger to each rising edge at the “50%” crossing. When Statistics is Off, it shows the time from the trigger to the last rising edge at the “50%” crossing. When Statistics is On, it shows the Current, Mean, Min, Max, Standard Deviation of time from the trigger to each rising edge at the “50%” crossing in multiple frames (number = Count). “]:} |
| Phase | Phase difference between two edges |
| FRR | Time from the first rising edge of channel “A” to the following first rising edge of channel B |
| FRF | Time from the first rising edge of channel A to the following first falling |
Delay
| Parameters | Meaning |
|---|---|
| Phase | Phase difference between two edges |
| FRR | Time from the first rising edge of channel A to the following first rising edge of channel B |
| FRF | rising –> first falling |
| FFR | falling –> first rising |
| FFF | falling –> first rising |
| LRR | rising –> last rising |
| LRF | rising –> last falling |
| LFR | falling –> last rising |
| LFF | falling –> last falling |
| Skew | Time of source A edge minus time of nearest source B edge |