How to analyze the waveform to determine that it is a second pulse signal?

The second pulse I understand is a pulse signal with a frequency of 1Hz, and its period is also 1 second. This kind of signal has a long period and is difficult to observe on an ordinary oscilloscope. Unless the pulse width is adjusted very narrow, such as 0. 1~0.2 seconds, the scanning time of the oscilloscope should be adjusted to the longest, and a burst pulse can be observed every second.