Agilent Technologies 54657A Guida Utente Scaricare il pdf (Pagina 33)

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Voltage Rise time/fall time measurements performed at the lower and

upper levels specified by you. Frequency, period, duty cycle, positive

pulse width, and negative pulse width measurements will be performed at

the center of both entered levels.

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Lower This softkey is displayed only when Voltage softkey is selected.

Select and rotate the knob closest to the

Cursors key to set the

lower threshold to the desired value.

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Upper This softkey is displayed only when Voltage softkey is selected.

Select and rotate the knob closest to the

Cursors key to set the

upper threshold to the desired value.

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Previous Menu Returns you to the previous softkey menu.

Selecting User Threshold Hints

Lower threshold level cannot be set to a value higher than the current upper

threshold level.

Upper threshold level cannot be set to a value lower than the current lower

threshold level.

If the upper and lower thresholds are set to levels greater to, or less than, the

current displayed waveform, then the automatic rise time, fall time, frequency,

period, duty cycle, positive pulse width, and negative pulse width measurements

will not be performed. This is because the measurement point is not on the

waveform.

Cursors can be used to set the threshold voltage levels as follows:

• Select an automatic time measurement with Show Meas set to On, and

thresholds set to 10%/90%. Once initiated, the cursors will display on the

waveform.

• Press Cursors key and record the current cursor voltage levels.

• Select Define Measurement Voltage, and adjust the upper and lower levels

to the previously recorded values.

• Slowly rotate the knob closest to the Cursors key to fine tune the upper and

lower threshold to the desired values. Cursor will track as long as the

measurement is valid.

Operating the Measurement/Storage Module

Setting Thresholds

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Agilent Technologies 54657A Guida Utente Pagina 33