Metrohm 797 VA Computrace - Manual (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.