Metrohm 797 VA Computrace - Manual (Page 183)

6.2 Calibration techniques with CVS and CPVS
797 VA Computrace – Software
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sweeps ( Voltammetric tab). “Total number of mea-
surements” must not exceed 10.
Voltammetric tab with Calibration technique “DT Suppressors
with calibration curve”
The Voltammetric tab of the EDIT WORKING METHOD PARAME-
TERS window contains parameters for preparation procedures and
VA measurement modes. With the Calibration technique "DT Supp-
ressors with calibration curve" the Voltammetric parameters are
not editable. They depend on the parameters defined for recording
the calibration curve.
Following parameters have to be defined:
Initial mixing time (s) [ read only ] [ 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 [ read only ] (see Conditioning cycles with CVS
and CPVS , section 6.3)
Start potential (V) [ -5...+5 V ; 0.2 V ] [ read only ]
Start voltage for the cyclic conditioning sweep.
End potential (V) [ -5...+5 V ; 1.625 V ] [ read only ]
Final voltage for the cyclic conditioning sweep.
No. of cycles [ 0...X ; 0 ] [ read only ]
Number of conditioning cycles.
Pretreatment (see Pretreatment with CVS and CPVS , section 6.3)
Cleaning potential (V) [ -5...+5 V ; 1.625 V ] [ read only ]
Voltage applied to the electrodes during the
Cleaning time .
Cleaning time (s) [ 0...80600 s ; 0 s ] [ read only ]
Time during which the Cleaning potential is app-
lied to the electrodes.
Equilibration potential (V) [ -5...+5 V ; 1.625 V ] (This pa-
rameter is with CPVS part of the sweep)
Voltage applied to the electrodes during the
Equilibration time .
Equilibration time (s) [ 0...80600 s ; 5 s ] (This parameter is
with CPVS part of the sweep)
Waiting time before starting the sweep; with
Equilibration potential applied to the electrodes. If
the checkbox Hydrodynamic (measurement) is not
checked, the stirrer is switched off during that
time.
Sweep [ read only ]
The sweep parameters depend on the mode (see
CVS - Cyclic Voltammetric Stripping section 3.2,