sampling interval 

in electroanalysis
https://doi.org/10.1351/goldbook.S05465
In Tast polarography, square-wave polarography, and similar techniques, the interval during which the current is measured or recorded.
Source:
PAC, 1985, 57, 1491. (Recommended terms, symbols, and definitions for electroanalytical chemistry (Recommendations 1985)) on page 1504 [Terms] [Paper]