Metrohm 797 VA Computrace - Manual (Page 177)

6.2 Calibration techniques with CVS and CPVS
797 VA Computrace – Software
165
saved sweeps of the last two “conditioning mea-
surements”.
Note: If you set a small value (e.g. < 1%), it can
take a long time until reaching the target.
Note: If both No. of conditioning measurements [
1...100 ; 1 ] and Auto Std.dev (%) [ >0.1 ; 1 ] are
activated, the conditioning is finished as soon as
the first of the two criterias is reached.
Additional conditioning after sample transfer
If this option is activated, an additional electrode
conditioning is started after sample addition. This
option can only be activated, if
Initial electrode
conditioning is activated.
Addition mixing time [ 0...80600 s ; 10 s ]
Time of mixing after Additions (for the first meas-
urement, the
Initial mixing time is used).
No. of additions [ 0...28 ; 2 ]
Number of additions of additive standard solution.
No. of replications [ 1...10 ; 2 ]
Number of replications (= total number of measu-
rements) for each variation (sample, standard ad-
dition, calibration level, conditioning measure-
ment). For cyclic modes (CV, CVS, CPVS) the “total
number of measurements” is the
No. of replica-
tions multiplied with the number of Save last ..
sweeps ( Voltammetric tab). “Total number of
measurements” must not exceed 10.
Voltammetric tab with Calibration technique “MLAT”
The Voltammetric tab of the EDIT WORKING METHOD PARAME-
TERS window contains parameters for preparation procedures and
VA measurement modes. The parameters displayed depend on the
measurement mode selected in the
WORKING METHOD SPECIFICA-
TIONS window. With “MLAT Standard addition for brighteners” fol-
lowing parameters have to be defined:
Initial mixing time (s) [ 0...80600 s ; 10 s ] (see Initial mixing time
with CVS and CPVS , section 6.3)
Time of mixing before the first measurement of
the sample solution.
Conditioning Cycles (see Conditioning cycles with CVS and CPVS ,
section 6.3)