# PAM Pk-Pk Amplitude

The IEEE 802.3cu compatible Pk-Pk Amplitude measurement returns a value in Volts for an electrical signal or Watts or dBm for an optical signal. The Pk-Pk amplitude measurement is defined as:

Where:

- Pmax is based on a 1e-2 hit ratio, where Pmax is the smallest power level that results in the number of samples above that level not exceeding the product of hit ratio and total number of observed samples. All samples are acquired in a single unit interval eye diagram.
- Pmin is based on a 1e-2 hit ratio, where Pmin is the largest power level that results in the number of samples below that level not exceeding the product of hit ratio and total number of observed samples. All samples are acquired in a single unit interval eye diagram.

The hit ratio default setting is 1e-2 and is based on the IEEE 802.3cu standard. However, after selecting the measurement you can change this ratio if needed.

## To measure

1. Click the measurement toolbar's PAM tab.
2. Click Auto Scale in the menu bar.
3. Click the More buttons to locate the Pk-Pk Amplitude button.
4. Click the button.

## SCPI Command

`:MEASure:EYE:PAM:PPAMplitude`