Instruction Manual

3.2 VA measurement modes

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.

First vertex potential (V) [ -5...+5 V ; -0.1 V ]

First turning point for the potential sweep.

Second vertex potential (V) [ -5...+5 V ; -0.9 V ]

Second turning point for the potential sweep (Can be differ-

ent from the Start potential).

Voltage step (V) [ > 0 V ; 0.006 V ]

Voltage step for direct voltage ramp.

Sweep rate (V/s) [ > 0 V/s ; 0.1 V/s ]

Ramp slope = Voltage step / Voltage step time.

No. of sweeps [ > 0 ; 1 ]

Number of cyclic sweeps to be performed.

Save last ... sweeps]

Number of cycles to be saved.

Note: Total number of saved sweeps is number of

Save last

sweeps multiplied with No. of replications.

Notes:

• The CV measurement mode can only be used with HMDE or

RDE electrodes.

• The following condition applies to the definition of Voltage

step

and Sweep rate:

Voltage step time = Voltage step / Sweep rate > 270 μs

• The measurement time t (i) is defined as follows:

Voltage step time ≥ 80 ms → t (i) = 20/16.67 ms (power fre-

quency 50/60 Hz)

Voltage step time < 80 ms → t (i) = Voltage step time / 4 (Volt-

age step time = Voltage step / Sweep rate)