Metrohm 797 VA Computrace Manuel d'utilisateur télécharger pdf (Page 58)

3 General settings for exploratory and determination mode

797 VA Computrace – Software

NP – Normal Pulse (for "Exploratory" only)

General:

NP or Normal Pulse voltammetry is the classic pulse voltam-

metric measurement mode with direct recording of the current. It is

equally well suited for irreversible and reversible systems and offers

a higher sensitivity than the DC voltammetry. The NP measurement

mode can only be set for the exploratory mode by selecting NP -

Normal pulse

for the Mode parameter in the EXPLORATORY SPECI-

FICATION

window.

Description:

For NP voltammetry, square-wave pulses with an increasing ampli-

tude are superimposed on a constant base voltage. The current i is

measured as a function of the voltage U at the end of the pulse.

This normally provides wave-shaped curves which can be evaluated

using the tangent method.

Base potential

Voltage

step

Pulse

time

Voltage step time

t (i)t (i)

Start potential

Half-wave voltage

Wave current

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Metrohm 797 VA Computrace Manuel d'utilisateur Page 58