Np – normal pulse (for "exploratory" only) – Metrohm 797 VA Computrace User Manual

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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)

Start potential

Half-wave voltage

Wave current