Instruction Manual

3 General settings for exploratory and determination mode

797 VA Computrace – Software

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