Instruction Manual

3 General settings for exploratory and determination mode

797 VA Computrace – Software

3.2 VA measurement modes

DP – Differential Pulse

General:

DP or Differential Pulse voltammetry is the most universal

and frequently used voltammetric measurement mode. It is equally

well suited for irreversible and reversible systems and offers a high

sensitivity. The DP measurement mode can be set for the ex-

ploratory and determination mode by selecting DP - Differential

pulse

for the Mode parameter in the EXPLORATORY SPECIFICATION

or WORKING METHOD SPECIFICATIONS window.

Description:

For DP voltammetry, rectangular pulses with a constant amplitude

are superimposed on a stepwise rising direct voltage ramp. The cur-

rent i is measured as a function of the voltage U immediately be-

fore the pulse and at the end of the pulse. From the differences be-

tween the two current measurements, peak-shaped curves are ob-

tained which are evaluated using linear, polynomial, horizontal or

exponential baselines.

Start potential

Pulse

amplitude

Voltage step

Pulse

time

Voltage step time

Peak voltage

Peak

height

i = i2 - i1

t (i1)t (i2)

t (i1)

t (i2)