Elenco 30MHz Dual Trace Manual do Utilizador descarregar pdf (Página 56)

APPLICATION

PULSE WIDTH MEASUREMENTS

(Refer to Fig.12)

1. Apply the pulse signal to the input jack and set the CH 1/CH 2 switch to the

channel to be used.

2. Use the VOLTS/DIV and VARIABLE controls to adjust the display so the

waveform is easily observed. Use the POSITION control to position the pulse over

the center horizontal graduation.

3. Measure the distance between the leading edge and trailing edge of the pulse

(along the center horizontal graduation line). Be sure that the VAR SWEEP

control is set to CAL. Multiply the number of horizontal divisions by the sweep

TIME/DIV, and if X10 magnification is used, further multiply this value by 1/10.

The measurement is summarized by the following equation:

Pulse Width = Hor div x TIME/DIV

(X 1/10 if X10 is used)

For the example shown in Fig.12, the pulse width at the center of the pulse is 4.6

divisions. If the sweep TIME/DIV is 0.2 ms and X10 magnification is used, the

pulse width is calculated as follows:

100

Fig.12 Pulse Width Measurement

Pulse Length

(at 50%)

Adjust to the vertical scale with POSITION

Align the waveform

with the center

using POSITION

1 2 ... 51 52 53 54 55 56 57 58 59 60 61 ... 67 68

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Elenco 30MHz Dual Trace Manual do Utilizador Página 56