At a recent checkup, I was shocked: Even though I was eating foods rich in saturated fat and a seemingly more indulgent diet, my total cholesterol was down 10 points, my bad LDL cholesterol was stellar, and my good HDL was the highest it's ever been.
As the frequency of the signal to be measured increases to approach the frequency of the source frequency, measurement error increases. To improve the accuracy of the frequency measurement for higher unknown frequency, we can use this second measurement method, count number of pulses in known time.
1 Frequency: â This is the number of times the waveform repeats itself within a one second time period. Frequency is the reciprocal of the time period, ( Æ = 1/T ) with the standard unit of frequency being the Hertz, (Hz).  Amplitude: â This is the magnitude or intensity of the signal waveform measured in volts or amps.