How many measurement sampling frequencies does the waveform measurement function support?
Waveform GraphThe measurement sampling frequency and time vary with the instrument being used. The instrument determines the optimal measurement sampling frequency to use based on the waveform being measured.
This answer explains the function using the AC/DC Clamp Meter CM4372/CM4374 as an example. The following table describes the relationship between sampling frequency and sampling time for waveforms measured by the CM4372 and CM4374:
| Measurement signal frequency | Sampling frequency | Sampling time |
| 0 Hz ≦ freq ≦ 39.5 Hz | 1.44 kHz | 100 ms |
| 39.5 Hz ＜ freq ≦ 79.5 Hz | 2.88 kHz | 50 ms |
| 79.5 Hz ＜ freq ≦ 159.5 Hz | 5.76 kHz | 25 ms |
| 159.5 Hz ＜ freq ≦ 389.5 Hz | 14.4 kHz | 10 ms |
| 389.5 Hz ＜ freq ≦ 1000 Hz | 28.8 kHz | 5 ms |
For example, measuring a 60 Hz sine wave will result in a sampling frequency of 2.88 kHz and a sampling time of 50 ms. Since a 60 Hz sine wave has a period of 16.666… ms, 3 wavelengths will be displayed.
