Owner manual

5.7 Program instructions

746 VA Trace Analyzer / 747 VA Stand

5-224

The current measurement with the DCTMODE measurement mode

normally provides wave-shaped curves which can be evaluated using

the tangent method (baseline of type linear) (see section 5.6.3).

U.wave

I.wave

If peak-shaped curves appear with the DCTMODE mode, these can be

evaluated only if the voltage sweep SSWEEP is used. The evaluation is

then the same as with other peaks using the baselines of type linear,

polynom or expon. (see section 5.6.3).

U.peak

I.peak

Comments • The DCTMODE measurement mode can be used with all types of

electrodes together with the instructions MEAS, SWEEP, DSWEEP,

FSWEEP or TSWEEP.

• The electrode type DME, SMDE, HMDE or RDE must be entered before

the DCTMODE measurement mode.

• With the DCTMODE measurement mode, the potentiostat always

operates in the operating mode "fast". SWEEP and FSWEEP are thus

identical for this mode.

• The quantity t.drop important for the definition of t.step depends

on the type of electrode selected:

DME t.drop = 20 ms

HMDE and RDE t.drop = 0 ms

SMDE t.drop = Drop.size ×× 40 ms

see also SWEEP, SSWEEP, DME, HMDE, SMDE, RDE