IUPDN

Type: CLASS

Purpose: The IUPDN class describes a dual-slope current-ramp waveform which can be applied by a potentiostat while in the Galvanostat mode.

The current is ramped from an initial current to an apex current and back again to a final current. Iupdn objects are normally used for cyclic scans such as pitting tests. The object encapsulates information about the initial, apex, and final currents, the ramp rates, and the data-acquisition rate.

The current range used for the Iupdn signal generator is selected from the largest absolute current limit (Initial, Final, Apex) in the waveform. The current range is fixed throughout the scan. The program does the best it can to reach lower current limits using the current range in use. Generally the smaller limits are only imprecise if they differ from the first by several orders of magnitude.

Iupdn objects use a staircase waveform. Data are sampled at each level on the staircase.

If the Skip button is pressed during the initial phase of the run, the Iupdn signal generator advances to the final phase. If the Skip button is pressed during the final phase, the Ciiv.Run() is prematurely ended.
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