Metrohm 797 VA Computrace Manuel d'utilisateur télécharger pdf (Page 181)

6.2 Calibration techniques with CVS and CPVS

797 VA Computrace – Software

169

Note: A determined calibration curve can only be adopted auto-

matically if the checkbox Save calibration curves additionally with-

out date and time

on the General tab of the GENERAL SETTINGS

window is checked.

Determination tab with Calibration technique “DT Suppressors

with calibration curve”

The Determination tab of the EDIT WORKING METHOD PARAME-

TERS

window contains general specifications for performing the

determination. The parameters displayed depend on the selected

Calibration technique and measurement Technique. With “DT Sup-

pressors with calibration curve” following parameters have to be

defined:

Sample identifier [ 32 characters ; "sample" ]

Identification for sample. The Sample identifier is

used for the file name.

Volume VMS (mL) [ > 0 mL ; 10 mL]

The volume of the Virgin Make-up Solution (see

VMS (Virgin Make-up Solution), section 6.4).

Cell volume (mL) [ > 0 mL ; 10 mL ] [ read only ]

Total volume of solution (equal to the volume of

the VMS (Virgin Make-up Solution)) in the measu-

ring vessel at the start of the determination. The

sample concentrations Conc. calculated refers to

this cell volume.

Initial electrode conditioning (see Initial electrode conditioning,

section 6.3)

Check the checkbox to use conditioning.

No. of conditioning measurements [ 1...100 ; 1 ]

Number of replications of conditioning measure-

ments. The “total number of conditioning measu-

rements” is the No. of conditioning measurements

multiplied with the number of Save last .. sweeps

(

Voltammetric tab). “Total number of conditioning

measurements” must not exceed 100.

or Auto Std.dev (%)[ >0.1 ; 1 ]

Define until which „Std.dev.“ the conditioning is

continued. The „Std.dev.“ is calculated from all sa-

ved sweeps of the last two “conditioning measu-

rements”.

Note: If you set a small value (e.g. < 1%), it can

take a long time until reaching the target.

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Metrohm 797 VA Computrace Manuel d'utilisateur Page 181

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