Metrohm 797 VA Computrace - Manual (Page 66)

3 General settings for exploratory and determination mode
797 VA Computrace – Software
54
Sweep parameters:
Hydrodynamic (measurement) [ on, off ; off ]
Enable/disable stirring of the RDE/SSE during the sweep.
Start potential (V) [ -5...+5 V ; -0.9 V ]
Start voltage for the voltage sweep.
End potential (V) [ -5...+5 V ; -0.1 V ]
Final voltage for the voltage sweep.
Voltage step (V) [ > 0 V ; 0.006 V ]
Voltage step for direct voltage ramp.
Voltage step time (s) [ > 0 s ; 0.8 s ]
Time interval after which the voltage in the sweep is increa-
sed or decreased by the amount
Voltage step .
Amplitude (V) [ -1...+1 V ; 0.01 V ]
Voltage amplitude of the sine wave voltage superimposed on
the direct voltage (rms value).
Modulation time (s) [ > 0 s ; 0.05 s ]
Time period during which the sine wave voltage is superim-
posed on the direct voltage.
Frequency (Hz) [ > 0...2000 Hz ; 50 Hz ]
Frequency of the superimposed sine wave voltage.
Phase sensitive [ on, off ; on ]
Enable/disable phase sensitive current measurement.
(deg) [ -180/-90...+180/+90° ; 0° ]
Phase shift of the alternating current in regard to the alternat-
ing voltage. For AC1 the maximum phase angle is ± 180°, for
AC2 ± 90°.
2nd harmonic [ on, off ; off ]
Enable/disable second harmonic current measurement (AC2).
Notes:
• The AC measurement mode can be used with all types of elec-
trodes.
• The following condition applies to the definition of the
Modula-
tion time :