# Amplitude

Amplitude is the measure of the difference between Waveform Top and Waveform Base of a displayed pulse waveform. This measurement may be compatible with PAM signals, depending on the PAM waveform. The measurement can be restricted to a region. Annotation labels are placed on the waveform showing the top (100%) and base (0%) levels. These levels are calculated over the entire display graticule. Therefore, the instrument displays the Top and Base labels on both ends of the graticule.

Amplitude = Waveform Top − Waveform Base

Where, Waveform Top is the most prevalent value in the upper portion of a pulse and Waveform Base is the most prevalent value in the lower portion of a pulse. Waveform Top may be less than or equal to the maximum value of the waveform. Waveform Base may be greater than or equal to the minimum value of the waveform.

PAM Compatibility. Because this measurement is based on waveform top and base levels and the passing of the waveform's edge through lower, middle, and upper thresholds, the measurement is not designed for PAM signals. However, the measurement may be able to be made on PAM signals if the waveform top and base definitions are manually set. This can be attempted using the Thresholds tab of the Configure Measurements dialog box.

This measurement may be compatible with PAM signals, depending on the PAM waveform.

## To measure

1. Click the toolbar's Amplitude tab.
2. Click the toolbar's More buttons to locate the Amplitude button.
3. Click the button.
4. Select the Region in which to make the measurement:
   - Displayed Waveform — is what you see in the waveform window (which can be a zoomed-in view of the complete waveform).
   - Entire Waveform — specifies the complete waveform.
   - Region N — If regions are enabled for the selected signal, you can select one of those regions.

## SCPI Command

`:MEASure:VERTical:VAMPlitude`