# Delta Time

The Δ Time (Delta Time) measurement measures the time differences between two waveforms as measured at the first crossing points. If only one waveform is displayed, the measured Δ Time is 0s. Annotation labels are placed at each crossing point. When this measurement is selected, you must choose which waveform is Signal 1 (Start measurement annotation) and which waveform is Signal 2 (Stop measurement annotation). If the waveforms are selected such that the Stop annotation occurs in time before the Start annotation, the measured time will be a negative value.

This measurement applies to NRZ waveforms and not to PAM waveforms.

## Configurable Measurement Parameters

None.

## To measure

1. Display two waveforms.
2. Click the measurement toolbar's Eye Meas tab.
3. Click Auto Scale in the menu bar.
4. Click the More button to locate the Δ Time button.
5. Click the button.
6. Select which waveform is Signal 1 (Start measurement annotation) and which waveform is Signal 2 (Stop measurement annotation).

## SCPI Command

`:MEASure:EYE:DTIMe`