Agilent Technologies 54657A Guía de usuario descargar pdf (Pagina 31)

Setting Thresholds

Without the Measurement/Storage module installed, rise time and fall time

measurements are performed at the 10%/90% threshold levels. The

remaining five time measurements (frequency, period, duty cycle, positive

pulse width, and negative pulse width) are all performed at the 50%

transition point. Refer to the User and Service Guide for your oscilloscope

for more information.

With the Measurement/Storage module installed, the thresholds are user

selectable. Rise time and fall time measurements are performed at 10%/90%,

20%/80%, or at a user defined threshold level. The remaining five time

measurements are performed at the center point of the currently selected

upper and lower threshold values.

•

If 10%/90% is selected, the center is 50%.

•

If 20%/80% is selected, the center is 50%.

•

If voltage is selected, the center is dependent on the current lower and

upper values.

As an example, if the lower value is set to 0 V, and the upper value is set to

50 mV, then the 50% level is 25 mV. 25 mV is the point that frequency,

period, duty cycle, positive pulse width, and negative pulse width will be

measured. The point of measurement is dependent on the amplitude of the

input signal.

Operating the Measurement/Storage Module

Setting Thresholds

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Agilent Technologies 54657A Guía de usuario Pagina 31