Metrohm 757 VA Computrace Uživatelský manuál stáhnout pdf (Strana 54)

3 General settings for exploratory and determination mode

757 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.

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.

Voltage step time (s)

[ > 0 s ; 0.8 s ]

Time interval after which the voltage in the sweep is in-

creased or decreased by the amount

Voltage step

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

alternating voltage. For AC1 the maximum phase angle is ±

180°, for AC2 ± 90°.

2nd harmonic

[ on, off ; off ]

Enable/disable second harmonic current measurement

(AC2).

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Metrohm 757 VA Computrace Uživatelský manuál Strana 54