Owner's manual

3 General settings for exploratory and determination mode

757 VA Computrace – Software

Voltage step time

Hg drop

surface

Notes:

• In the exploratory mode, the DME can be used for all meas-

urement modes except SqW, CV and PSA. In the determina-

tion mode, the DME can be used for all measurement modes

except DC, SqW, CV and PSA.

• An advantage of the DME compared with the SMDE is that

the MME capillary is subjected to less mechanical stress.

• A disadvantage of the DME compared with the SMDE and

HMDE is the higher mercury consumption and the lower sen-

sitivity as the electrode surface constantly changes during the

measurement phase.

SMDE

SMDE is an electrode mode of the Multi-Mode Electrode and

stands for Static Mercury Drop Electrode. It combines the fea-

tures of the DME and the HMDE: as with the DME, the mercury

drops are constantly renewed, but during the measurement the

drop surface is constant as in the HMDE case. Each mercury

drop is knocked off by a tapping mechanism after the

Voltage step

time

set in the measurement mode.

Drop size

[ 1...9 ; 4 ]

Size of the mercury drop (surface 0.15 mm

...0.60 mm

Voltage step time

Drop size

40 ms

Hg drop

surface